MD WebUI: Uglify vulcanized javascript bundles to remove comments/whitespace

chrome/browser/resources/md_history/app.crisper.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
-/**
- * @fileoverview PromiseResolver is a helper class that allows creating a
- * Promise that will be fulfilled (resolved or rejected) some time later.
- *
- * Example:
- *  var resolver = new PromiseResolver();
- *  resolver.promise.then(function(result) {
- *    console.log('resolved with', result);
- *  });
- *  ...
- *  ...
- *  resolver.resolve({hello: 'world'});
- */
-
-/**
- * @constructor @struct
- * @template T
- */
 function PromiseResolver() {
-  /** @private {function(T=): void} */
   this.resolve_;
-
-  /** @private {function(*=): void} */
   this.reject_;
-
-  /** @private {!Promise<T>} */
   this.promise_ = new Promise(function(resolve, reject) {
     this.resolve_ = resolve;
     this.reject_ = reject;
   }.bind(this));
 }
 
 PromiseResolver.prototype = {
-  /** @return {!Promise<T>} */
-  get promise() { return this.promise_; },
-  set promise(p) { assertNotReached(); },
+  get promise() {
+    return this.promise_;
+  },
+  set promise(p) {
+    assertNotReached();
+  },
+  get resolve() {
+    return this.resolve_;
+  },
+  set resolve(r) {
+    assertNotReached();
+  },
+  get reject() {
+    return this.reject_;
+  },
+  set reject(s) {
+    assertNotReached();
+  }
+};
 
-  /** @return {function(T=): void} */
-  get resolve() { return this.resolve_; },
-  set resolve(r) { assertNotReached(); },
-
-  /** @return {function(*=): void} */
-  get reject() { return this.reject_; },
-  set reject(s) { assertNotReached(); },
-};
 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
-/**
- * The global object.
- * @type {!Object}
- * @const
- */
 var global = this;
 
-/** @typedef {{eventName: string, uid: number}} */
 var WebUIListener;
 
-/** Platform, package, object property, and Event support. **/
 var cr = cr || function() {
   'use strict';
-
-  /**
-   * Builds an object structure for the provided namespace path,
-   * ensuring that names that already exist are not overwritten. For
-   * example:
-   * "a.b.c" -> a = {};a.b={};a.b.c={};
-   * @param {string} name Name of the object that this file defines.
-   * @param {*=} opt_object The object to expose at the end of the path.
-   * @param {Object=} opt_objectToExportTo The object to add the path to;
-   *     default is {@code global}.
-   * @return {!Object} The last object exported (i.e. exportPath('cr.ui')
-   *     returns a reference to the ui property of window.cr).
-   * @private
-   */
   function exportPath(name, opt_object, opt_objectToExportTo) {
     var parts = name.split('.');
     var cur = opt_objectToExportTo || global;
-
-    for (var part; parts.length && (part = parts.shift());) {
+    for (var part; parts.length && (part = parts.shift()); ) {
       if (!parts.length && opt_object !== undefined) {
-        // last part and we have an object; use it
         cur[part] = opt_object;
       } else if (part in cur) {
         cur = cur[part];
       } else {
         cur = cur[part] = {};
       }
     }
     return cur;
   }
-
-  /**
-   * Fires a property change event on the target.
-   * @param {EventTarget} target The target to dispatch the event on.
-   * @param {string} propertyName The name of the property that changed.
-   * @param {*} newValue The new value for the property.
-   * @param {*} oldValue The old value for the property.
-   */
   function dispatchPropertyChange(target, propertyName, newValue, oldValue) {
     var e = new Event(propertyName + 'Change');
     e.propertyName = propertyName;
     e.newValue = newValue;
     e.oldValue = oldValue;
     target.dispatchEvent(e);
   }
-
-  /**
-   * Converts a camelCase javascript property name to a hyphenated-lower-case
-   * attribute name.
-   * @param {string} jsName The javascript camelCase property name.
-   * @return {string} The equivalent hyphenated-lower-case attribute name.
-   */
   function getAttributeName(jsName) {
     return jsName.replace(/([A-Z])/g, '-$1').toLowerCase();
   }
-
-  /**
-   * The kind of property to define in {@code defineProperty}.
-   * @enum {string}
-   * @const
-   */
   var PropertyKind = {
-    /**
-     * Plain old JS property where the backing data is stored as a "private"
-     * field on the object.
-     * Use for properties of any type. Type will not be checked.
-     */
     JS: 'js',
-
-    /**
-     * The property backing data is stored as an attribute on an element.
-     * Use only for properties of type {string}.
-     */
     ATTR: 'attr',
-
-    /**
-     * The property backing data is stored as an attribute on an element. If the
-     * element has the attribute then the value is true.
-     * Use only for properties of type {boolean}.
-     */
     BOOL_ATTR: 'boolAttr'
   };
-
-  /**
-   * Helper function for defineProperty that returns the getter to use for the
-   * property.
-   * @param {string} name The name of the property.
-   * @param {PropertyKind} kind The kind of the property.
-   * @return {function():*} The getter for the property.
-   */
   function getGetter(name, kind) {
     switch (kind) {
-      case PropertyKind.JS:
-        var privateName = name + '_';
-        return function() {
-          return this[privateName];
-        };
-      case PropertyKind.ATTR:
-        var attributeName = getAttributeName(name);
-        return function() {
-          return this.getAttribute(attributeName);
-        };
-      case PropertyKind.BOOL_ATTR:
-        var attributeName = getAttributeName(name);
-        return function() {
-          return this.hasAttribute(attributeName);
-        };
+     case PropertyKind.JS:
+      var privateName = name + '_';
+      return function() {
+        return this[privateName];
+      };
+
+     case PropertyKind.ATTR:
+      var attributeName = getAttributeName(name);
+      return function() {
+        return this.getAttribute(attributeName);
+      };
+
+     case PropertyKind.BOOL_ATTR:
+      var attributeName = getAttributeName(name);
+      return function() {
+        return this.hasAttribute(attributeName);
+      };
     }
-
-    // TODO(dbeam): replace with assertNotReached() in assert.js when I can coax
-    // the browser/unit tests to preprocess this file through grit.
     throw 'not reached';
   }
-
-  /**
-   * Helper function for defineProperty that returns the setter of the right
-   * kind.
-   * @param {string} name The name of the property we are defining the setter
-   *     for.
-   * @param {PropertyKind} kind The kind of property we are getting the
-   *     setter for.
-   * @param {function(*, *):void=} opt_setHook A function to run after the
-   *     property is set, but before the propertyChange event is fired.
-   * @return {function(*):void} The function to use as a setter.
-   */
   function getSetter(name, kind, opt_setHook) {
     switch (kind) {
-      case PropertyKind.JS:
-        var privateName = name + '_';
-        return function(value) {
-          var oldValue = this[name];
-          if (value !== oldValue) {
-            this[privateName] = value;
-            if (opt_setHook)
-              opt_setHook.call(this, value, oldValue);
-            dispatchPropertyChange(this, name, value, oldValue);
-          }
-        };
+     case PropertyKind.JS:
+      var privateName = name + '_';
+      return function(value) {
+        var oldValue = this[name];
+        if (value !== oldValue) {
+          this[privateName] = value;
+          if (opt_setHook) opt_setHook.call(this, value, oldValue);
+          dispatchPropertyChange(this, name, value, oldValue);
+        }
+      };
 
-      case PropertyKind.ATTR:
-        var attributeName = getAttributeName(name);
-        return function(value) {
-          var oldValue = this[name];
-          if (value !== oldValue) {
-            if (value == undefined)
-              this.removeAttribute(attributeName);
-            else
-              this.setAttribute(attributeName, value);
-            if (opt_setHook)
-              opt_setHook.call(this, value, oldValue);
-            dispatchPropertyChange(this, name, value, oldValue);
-          }
-        };
+     case PropertyKind.ATTR:
+      var attributeName = getAttributeName(name);
+      return function(value) {
+        var oldValue = this[name];
+        if (value !== oldValue) {
+          if (value == undefined) this.removeAttribute(attributeName); else this.setAttribute(attributeName, value);
+          if (opt_setHook) opt_setHook.call(this, value, oldValue);
+          dispatchPropertyChange(this, name, value, oldValue);
+        }
+      };
 
-      case PropertyKind.BOOL_ATTR:
-        var attributeName = getAttributeName(name);
-        return function(value) {
-          var oldValue = this[name];
-          if (value !== oldValue) {
-            if (value)
-              this.setAttribute(attributeName, name);
-            else
-              this.removeAttribute(attributeName);
-            if (opt_setHook)
-              opt_setHook.call(this, value, oldValue);
-            dispatchPropertyChange(this, name, value, oldValue);
-          }
-        };
+     case PropertyKind.BOOL_ATTR:
+      var attributeName = getAttributeName(name);
+      return function(value) {
+        var oldValue = this[name];
+        if (value !== oldValue) {
+          if (value) this.setAttribute(attributeName, name); else this.removeAttribute(attributeName);
+          if (opt_setHook) opt_setHook.call(this, value, oldValue);
+          dispatchPropertyChange(this, name, value, oldValue);
+        }
+      };
     }
-
-    // TODO(dbeam): replace with assertNotReached() in assert.js when I can coax
-    // the browser/unit tests to preprocess this file through grit.
     throw 'not reached';
   }
-
-  /**
-   * Defines a property on an object. When the setter changes the value a
-   * property change event with the type {@code name + 'Change'} is fired.
-   * @param {!Object} obj The object to define the property for.
-   * @param {string} name The name of the property.
-   * @param {PropertyKind=} opt_kind What kind of underlying storage to use.
-   * @param {function(*, *):void=} opt_setHook A function to run after the
-   *     property is set, but before the propertyChange event is fired.
-   */
   function defineProperty(obj, name, opt_kind, opt_setHook) {
-    if (typeof obj == 'function')
-      obj = obj.prototype;
-
-    var kind = /** @type {PropertyKind} */ (opt_kind || PropertyKind.JS);
-
-    if (!obj.__lookupGetter__(name))
-      obj.__defineGetter__(name, getGetter(name, kind));
-
-    if (!obj.__lookupSetter__(name))
-      obj.__defineSetter__(name, getSetter(name, kind, opt_setHook));
+    if (typeof obj == 'function') obj = obj.prototype;
+    var kind = opt_kind || PropertyKind.JS;
+    if (!obj.__lookupGetter__(name)) obj.__defineGetter__(name, getGetter(name, kind));
+    if (!obj.__lookupSetter__(name)) obj.__defineSetter__(name, getSetter(name, kind, opt_setHook));
   }
-
-  /**
-   * Counter for use with createUid
-   */
   var uidCounter = 1;
-
-  /**
-   * @return {number} A new unique ID.
-   */
   function createUid() {
     return uidCounter++;
   }
-
-  /**
-   * Returns a unique ID for the item. This mutates the item so it needs to be
-   * an object
-   * @param {!Object} item The item to get the unique ID for.
-   * @return {number} The unique ID for the item.
-   */
   function getUid(item) {
-    if (item.hasOwnProperty('uid'))
-      return item.uid;
+    if (item.hasOwnProperty('uid')) return item.uid;
     return item.uid = createUid();
   }
-
-  /**
-   * Dispatches a simple event on an event target.
-   * @param {!EventTarget} target The event target to dispatch the event on.
-   * @param {string} type The type of the event.
-   * @param {boolean=} opt_bubbles Whether the event bubbles or not.
-   * @param {boolean=} opt_cancelable Whether the default action of the event
-   *     can be prevented. Default is true.
-   * @return {boolean} If any of the listeners called {@code preventDefault}
-   *     during the dispatch this will return false.
-   */
   function dispatchSimpleEvent(target, type, opt_bubbles, opt_cancelable) {
     var e = new Event(type, {
       bubbles: opt_bubbles,
       cancelable: opt_cancelable === undefined || opt_cancelable
     });
     return target.dispatchEvent(e);
   }
-
-  /**
-   * Calls |fun| and adds all the fields of the returned object to the object
-   * named by |name|. For example, cr.define('cr.ui', function() {
-   *   function List() {
-   *     ...
-   *   }
-   *   function ListItem() {
-   *     ...
-   *   }
-   *   return {
-   *     List: List,
-   *     ListItem: ListItem,
-   *   };
-   * });
-   * defines the functions cr.ui.List and cr.ui.ListItem.
-   * @param {string} name The name of the object that we are adding fields to.
-   * @param {!Function} fun The function that will return an object containing
-   *     the names and values of the new fields.
-   */
   function define(name, fun) {
     var obj = exportPath(name);
     var exports = fun();
     for (var propertyName in exports) {
-      // Maybe we should check the prototype chain here? The current usage
-      // pattern is always using an object literal so we only care about own
-      // properties.
-      var propertyDescriptor = Object.getOwnPropertyDescriptor(exports,
-                                                               propertyName);
-      if (propertyDescriptor)
-        Object.defineProperty(obj, propertyName, propertyDescriptor);
+      var propertyDescriptor = Object.getOwnPropertyDescriptor(exports, propertyName);
+      if (propertyDescriptor) Object.defineProperty(obj, propertyName, propertyDescriptor);
     }
   }
-
-  /**
-   * Adds a {@code getInstance} static method that always return the same
-   * instance object.
-   * @param {!Function} ctor The constructor for the class to add the static
-   *     method to.
-   */
   function addSingletonGetter(ctor) {
     ctor.getInstance = function() {
       return ctor.instance_ || (ctor.instance_ = new ctor());
     };
   }
-
-  /**
-   * Forwards public APIs to private implementations.
-   * @param {Function} ctor Constructor that have private implementations in its
-   *     prototype.
-   * @param {Array<string>} methods List of public method names that have their
-   *     underscored counterparts in constructor's prototype.
-   * @param {string=} opt_target Selector for target node.
-   */
   function makePublic(ctor, methods, opt_target) {
     methods.forEach(function(method) {
       ctor[method] = function() {
-        var target = opt_target ? document.getElementById(opt_target) :
-                     ctor.getInstance();
+        var target = opt_target ? document.getElementById(opt_target) : ctor.getInstance();
         return target[method + '_'].apply(target, arguments);
       };
     });
   }
-
-  /**
-   * The mapping used by the sendWithPromise mechanism to tie the Promise
-   * returned to callers with the corresponding WebUI response. The mapping is
-   * from ID to the PromiseResolver helper; the ID is generated by
-   * sendWithPromise and is unique across all invocations of said method.
-   * @type {!Object<!PromiseResolver>}
-   */
   var chromeSendResolverMap = {};
-
-  /**
-   * The named method the WebUI handler calls directly in response to a
-   * chrome.send call that expects a response. The handler requires no knowledge
-   * of the specific name of this method, as the name is passed to the handler
-   * as the first argument in the arguments list of chrome.send. The handler
-   * must pass the ID, also sent via the chrome.send arguments list, as the
-   * first argument of the JS invocation; additionally, the handler may
-   * supply any number of other arguments that will be included in the response.
-   * @param {string} id The unique ID identifying the Promise this response is
-   *     tied to.
-   * @param {boolean} isSuccess Whether the request was successful.
-   * @param {*} response The response as sent from C++.
-   */
   function webUIResponse(id, isSuccess, response) {
     var resolver = chromeSendResolverMap[id];
     delete chromeSendResolverMap[id];
-
-    if (isSuccess)
-      resolver.resolve(response);
-    else
-      resolver.reject(response);
+    if (isSuccess) resolver.resolve(response); else resolver.reject(response);
   }
-
-  /**
-   * A variation of chrome.send, suitable for messages that expect a single
-   * response from C++.
-   * @param {string} methodName The name of the WebUI handler API.
-   * @param {...*} var_args Varibale number of arguments to be forwarded to the
-   *     C++ call.
-   * @return {!Promise}
-   */
   function sendWithPromise(methodName, var_args) {
     var args = Array.prototype.slice.call(arguments, 1);
     var promiseResolver = new PromiseResolver();
     var id = methodName + '_' + createUid();
     chromeSendResolverMap[id] = promiseResolver;
-    chrome.send(methodName, [id].concat(args));
+    chrome.send(methodName, [ id ].concat(args));
     return promiseResolver.promise;
   }
-
-  /**
-   * A map of maps associating event names with listeners. The 2nd level map
-   * associates a listener ID with the callback function, such that individual
-   * listeners can be removed from an event without affecting other listeners of
-   * the same event.
-   * @type {!Object<!Object<!Function>>}
-   */
   var webUIListenerMap = {};
-
-  /**
-   * The named method the WebUI handler calls directly when an event occurs.
-   * The WebUI handler must supply the name of the event as the first argument
-   * of the JS invocation; additionally, the handler may supply any number of
-   * other arguments that will be forwarded to the listener callbacks.
-   * @param {string} event The name of the event that has occurred.
-   * @param {...*} var_args Additional arguments passed from C++.
-   */
   function webUIListenerCallback(event, var_args) {
     var eventListenersMap = webUIListenerMap[event];
     if (!eventListenersMap) {
-      // C++ event sent for an event that has no listeners.
-      // TODO(dpapad): Should a warning be displayed here?
       return;
     }
-
     var args = Array.prototype.slice.call(arguments, 1);
     for (var listenerId in eventListenersMap) {
       eventListenersMap[listenerId].apply(null, args);
     }
   }
-
-  /**
-   * Registers a listener for an event fired from WebUI handlers. Any number of
-   * listeners may register for a single event.
-   * @param {string} eventName The event to listen to.
-   * @param {!Function} callback The callback run when the event is fired.
-   * @return {!WebUIListener} An object to be used for removing a listener via
-   *     cr.removeWebUIListener. Should be treated as read-only.
-   */
   function addWebUIListener(eventName, callback) {
     webUIListenerMap[eventName] = webUIListenerMap[eventName] || {};
     var uid = createUid();
     webUIListenerMap[eventName][uid] = callback;
-    return {eventName: eventName, uid: uid};
+    return {
+      eventName: eventName,
+      uid: uid
+    };
   }
-
-  /**
-   * Removes a listener. Does nothing if the specified listener is not found.
-   * @param {!WebUIListener} listener The listener to be removed (as returned by
-   *     addWebUIListener).
-   * @return {boolean} Whether the given listener was found and actually
-   *     removed.
-   */
   function removeWebUIListener(listener) {
-    var listenerExists = webUIListenerMap[listener.eventName] &&
-        webUIListenerMap[listener.eventName][listener.uid];
+    var listenerExists = webUIListenerMap[listener.eventName] && webUIListenerMap[listener.eventName][listener.uid];
     if (listenerExists) {
       delete webUIListenerMap[listener.eventName][listener.uid];
       return true;
     }
     return false;
   }
-
   return {
     addSingletonGetter: addSingletonGetter,
     createUid: createUid,
     define: define,
     defineProperty: defineProperty,
     dispatchPropertyChange: dispatchPropertyChange,
     dispatchSimpleEvent: dispatchSimpleEvent,
     exportPath: exportPath,
     getUid: getUid,
     makePublic: makePublic,
     PropertyKind: PropertyKind,
-
-    // C++ <-> JS communication related methods.
     addWebUIListener: addWebUIListener,
     removeWebUIListener: removeWebUIListener,
     sendWithPromise: sendWithPromise,
     webUIListenerCallback: webUIListenerCallback,
     webUIResponse: webUIResponse,
-
     get doc() {
       return document;
     },
-
-    /** Whether we are using a Mac or not. */
     get isMac() {
       return /Mac/.test(navigator.platform);
     },
-
-    /** Whether this is on the Windows platform or not. */
     get isWindows() {
       return /Win/.test(navigator.platform);
     },
-
-    /** Whether this is on chromeOS or not. */
     get isChromeOS() {
       return /CrOS/.test(navigator.userAgent);
     },
-
-    /** Whether this is on vanilla Linux (not chromeOS). */
     get isLinux() {
       return /Linux/.test(navigator.userAgent);
     },
-
-    /** Whether this is on Android. */
     get isAndroid() {
       return /Android/.test(navigator.userAgent);
     },
-
-    /** Whether this is on iOS. */
     get isIOS() {
       return /iPad|iPhone|iPod/.test(navigator.platform);
     }
   };
 }();
+
 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
 cr.define('cr.ui', function() {
-
-  /**
-   * Decorates elements as an instance of a class.
-   * @param {string|!Element} source The way to find the element(s) to decorate.
-   *     If this is a string then {@code querySeletorAll} is used to find the
-   *     elements to decorate.
-   * @param {!Function} constr The constructor to decorate with. The constr
-   *     needs to have a {@code decorate} function.
-   */
   function decorate(source, constr) {
     var elements;
-    if (typeof source == 'string')
-      elements = cr.doc.querySelectorAll(source);
-    else
-      elements = [source];
-
+    if (typeof source == 'string') elements = cr.doc.querySelectorAll(source); else elements = [ source ];
     for (var i = 0, el; el = elements[i]; i++) {
-      if (!(el instanceof constr))
-        constr.decorate(el);
+      if (!(el instanceof constr)) constr.decorate(el);
     }
   }
-
-  /**
-   * Helper function for creating new element for define.
-   */
   function createElementHelper(tagName, opt_bag) {
-    // Allow passing in ownerDocument to create in a different document.
     var doc;
-    if (opt_bag && opt_bag.ownerDocument)
-      doc = opt_bag.ownerDocument;
-    else
-      doc = cr.doc;
+    if (opt_bag && opt_bag.ownerDocument) doc = opt_bag.ownerDocument; else doc = cr.doc;
     return doc.createElement(tagName);
   }
-
-  /**
-   * Creates the constructor for a UI element class.
-   *
-   * Usage:
-   * <pre>
-   * var List = cr.ui.define('list');
-   * List.prototype = {
-   *   __proto__: HTMLUListElement.prototype,
-   *   decorate: function() {
-   *     ...
-   *   },
-   *   ...
-   * };
-   * </pre>
-   *
-   * @param {string|Function} tagNameOrFunction The tagName or
-   *     function to use for newly created elements. If this is a function it
-   *     needs to return a new element when called.
-   * @return {function(Object=):Element} The constructor function which takes
-   *     an optional property bag. The function also has a static
-   *     {@code decorate} method added to it.
-   */
   function define(tagNameOrFunction) {
     var createFunction, tagName;
     if (typeof tagNameOrFunction == 'function') {
       createFunction = tagNameOrFunction;
       tagName = '';
     } else {
       createFunction = createElementHelper;
       tagName = tagNameOrFunction;
     }
-
-    /**
-     * Creates a new UI element constructor.
-     * @param {Object=} opt_propertyBag Optional bag of properties to set on the
-     *     object after created. The property {@code ownerDocument} is special
-     *     cased and it allows you to create the element in a different
-     *     document than the default.
-     * @constructor
-     */
     function f(opt_propertyBag) {
       var el = createFunction(tagName, opt_propertyBag);
       f.decorate(el);
       for (var propertyName in opt_propertyBag) {
         el[propertyName] = opt_propertyBag[propertyName];
       }
       return el;
     }
-
-    /**
-     * Decorates an element as a UI element class.
-     * @param {!Element} el The element to decorate.
-     */
     f.decorate = function(el) {
       el.__proto__ = f.prototype;
       el.decorate();
     };
-
     return f;
   }
-
-  /**
-   * Input elements do not grow and shrink with their content. This is a simple
-   * (and not very efficient) way of handling shrinking to content with support
-   * for min width and limited by the width of the parent element.
-   * @param {!HTMLElement} el The element to limit the width for.
-   * @param {!HTMLElement} parentEl The parent element that should limit the
-   *     size.
-   * @param {number} min The minimum width.
-   * @param {number=} opt_scale Optional scale factor to apply to the width.
-   */
   function limitInputWidth(el, parentEl, min, opt_scale) {
-    // Needs a size larger than borders
     el.style.width = '10px';
     var doc = el.ownerDocument;
     var win = doc.defaultView;
     var computedStyle = win.getComputedStyle(el);
     var parentComputedStyle = win.getComputedStyle(parentEl);
     var rtl = computedStyle.direction == 'rtl';
-
-    // To get the max width we get the width of the treeItem minus the position
-    // of the input.
-    var inputRect = el.getBoundingClientRect();  // box-sizing
+    var inputRect = el.getBoundingClientRect();
     var parentRect = parentEl.getBoundingClientRect();
-    var startPos = rtl ? parentRect.right - inputRect.right :
-        inputRect.left - parentRect.left;
-
-    // Add up border and padding of the input.
-    var inner = parseInt(computedStyle.borderLeftWidth, 10) +
-        parseInt(computedStyle.paddingLeft, 10) +
-        parseInt(computedStyle.paddingRight, 10) +
-        parseInt(computedStyle.borderRightWidth, 10);
-
-    // We also need to subtract the padding of parent to prevent it to overflow.
-    var parentPadding = rtl ? parseInt(parentComputedStyle.paddingLeft, 10) :
-        parseInt(parentComputedStyle.paddingRight, 10);
-
+    var startPos = rtl ? parentRect.right - inputRect.right : inputRect.left - parentRect.left;
+    var inner = parseInt(computedStyle.borderLeftWidth, 10) + parseInt(computedStyle.paddingLeft, 10) + parseInt(computedStyle.paddingRight, 10) + parseInt(computedStyle.borderRightWidth, 10);
+    var parentPadding = rtl ? parseInt(parentComputedStyle.paddingLeft, 10) : parseInt(parentComputedStyle.paddingRight, 10);
     var max = parentEl.clientWidth - startPos - inner - parentPadding;
-    if (opt_scale)
-      max *= opt_scale;
-
+    if (opt_scale) max *= opt_scale;
     function limit() {
       if (el.scrollWidth > max) {
         el.style.width = max + 'px';
       } else {
         el.style.width = 0;
         var sw = el.scrollWidth;
         if (sw < min) {
           el.style.width = min + 'px';
         } else {
           el.style.width = sw + 'px';
         }
       }
     }
-
     el.addEventListener('input', limit);
     limit();
   }
-
-  /**
-   * Takes a number and spits out a value CSS will be happy with. To avoid
-   * subpixel layout issues, the value is rounded to the nearest integral value.
-   * @param {number} pixels The number of pixels.
-   * @return {string} e.g. '16px'.
-   */
   function toCssPx(pixels) {
-    if (!window.isFinite(pixels))
-      console.error('Pixel value is not a number: ' + pixels);
+    if (!window.isFinite(pixels)) console.error('Pixel value is not a number: ' + pixels);
     return Math.round(pixels) + 'px';
   }
-
-  /**
-   * Users complain they occasionaly use doubleclicks instead of clicks
-   * (http://crbug.com/140364). To fix it we freeze click handling for
-   * the doubleclick time interval.
-   * @param {MouseEvent} e Initial click event.
-   */
   function swallowDoubleClick(e) {
     var doc = e.target.ownerDocument;
     var counter = Math.min(1, e.detail);
     function swallow(e) {
       e.stopPropagation();
       e.preventDefault();
     }
     function onclick(e) {
       if (e.detail > counter) {
         counter = e.detail;
-        // Swallow the click since it's a click inside the doubleclick timeout.
         swallow(e);
       } else {
-        // Stop tracking clicks and let regular handling.
         doc.removeEventListener('dblclick', swallow, true);
         doc.removeEventListener('click', onclick, true);
       }
     }
-    // The following 'click' event (if e.type == 'mouseup') mustn't be taken
-    // into account (it mustn't stop tracking clicks). Start event listening
-    // after zero timeout.
     setTimeout(function() {
       doc.addEventListener('click', onclick, true);
       doc.addEventListener('dblclick', swallow, true);
     }, 0);
   }
-
   return {
     decorate: decorate,
     define: define,
     limitInputWidth: limitInputWidth,
     toCssPx: toCssPx,
     swallowDoubleClick: swallowDoubleClick
   };
 });
+
 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
-/**
- * @fileoverview A command is an abstraction of an action a user can do in the
- * UI.
- *
- * When the focus changes in the document for each command a canExecute event
- * is dispatched on the active element. By listening to this event you can
- * enable and disable the command by setting the event.canExecute property.
- *
- * When a command is executed a command event is dispatched on the active
- * element. Note that you should stop the propagation after you have handled the
- * command if there might be other command listeners higher up in the DOM tree.
- */
-
 cr.define('cr.ui', function() {
-
-  /**
-   * This is used to identify keyboard shortcuts.
-   * @param {string} shortcut The text used to describe the keys for this
-   *     keyboard shortcut.
-   * @constructor
-   */
   function KeyboardShortcut(shortcut) {
     var mods = {};
     var ident = '';
     shortcut.split('|').forEach(function(part) {
       var partLc = part.toLowerCase();
       switch (partLc) {
-        case 'alt':
-        case 'ctrl':
-        case 'meta':
-        case 'shift':
-          mods[partLc + 'Key'] = true;
-          break;
-        default:
-          if (ident)
-            throw Error('Invalid shortcut');
-          ident = part;
+       case 'alt':
+       case 'ctrl':
+       case 'meta':
+       case 'shift':
+        mods[partLc + 'Key'] = true;
+        break;
+
+       default:
+        if (ident) throw Error('Invalid shortcut');
+        ident = part;
       }
     });
-
     this.ident_ = ident;
     this.mods_ = mods;
   }
-
   KeyboardShortcut.prototype = {
-    /**
-     * Whether the keyboard shortcut object matches a keyboard event.
-     * @param {!Event} e The keyboard event object.
-     * @return {boolean} Whether we found a match or not.
-     */
     matchesEvent: function(e) {
       if (e.key == this.ident_) {
-        // All keyboard modifiers needs to match.
         var mods = this.mods_;
-        return ['altKey', 'ctrlKey', 'metaKey', 'shiftKey'].every(function(k) {
+        return [ 'altKey', 'ctrlKey', 'metaKey', 'shiftKey' ].every(function(k) {
           return e[k] == !!mods[k];
         });
       }
       return false;
     }
   };
-
-  /**
-   * Creates a new command element.
-   * @constructor
-   * @extends {HTMLElement}
-   */
   var Command = cr.ui.define('command');
-
   Command.prototype = {
     __proto__: HTMLElement.prototype,
-
-    /**
-     * Initializes the command.
-     */
     decorate: function() {
       CommandManager.init(assert(this.ownerDocument));
-
-      if (this.hasAttribute('shortcut'))
-        this.shortcut = this.getAttribute('shortcut');
+      if (this.hasAttribute('shortcut')) this.shortcut = this.getAttribute('shortcut');
     },
-
-    /**
-     * Executes the command by dispatching a command event on the given element.
-     * If |element| isn't given, the active element is used instead.
-     * If the command is {@code disabled} this does nothing.
-     * @param {HTMLElement=} opt_element Optional element to dispatch event on.
-     */
     execute: function(opt_element) {
-      if (this.disabled)
-        return;
+      if (this.disabled) return;
       var doc = this.ownerDocument;
       if (doc.activeElement) {
-        var e = new Event('command', {bubbles: true});
+        var e = new Event('command', {
+          bubbles: true
+        });
         e.command = this;
-
         (opt_element || doc.activeElement).dispatchEvent(e);
       }
     },
-
-    /**
-     * Call this when there have been changes that might change whether the
-     * command can be executed or not.
-     * @param {Node=} opt_node Node for which to actuate command state.
-     */
     canExecuteChange: function(opt_node) {
-      dispatchCanExecuteEvent(this,
-                              opt_node || this.ownerDocument.activeElement);
+      dispatchCanExecuteEvent(this, opt_node || this.ownerDocument.activeElement);
     },
-
-    /**
-     * The keyboard shortcut that triggers the command. This is a string
-     * consisting of a key (as reported by WebKit in keydown) as
-     * well as optional key modifiers joinded with a '|'.
-     *
-     * Multiple keyboard shortcuts can be provided by separating them by
-     * whitespace.
-     *
-     * For example:
-     *   "F1"
-     *   "Backspace|Meta" for Apple command backspace.
-     *   "a|Ctrl" for Control A
-     *   "Delete Backspace|Meta" for Delete and Command Backspace
-     *
-     * @type {string}
-     */
     shortcut_: '',
     get shortcut() {
       return this.shortcut_;
     },
     set shortcut(shortcut) {
       var oldShortcut = this.shortcut_;
       if (shortcut !== oldShortcut) {
         this.keyboardShortcuts_ = shortcut.split(/\s+/).map(function(shortcut) {
           return new KeyboardShortcut(shortcut);
         });
-
-        // Set this after the keyboardShortcuts_ since that might throw.
         this.shortcut_ = shortcut;
-        cr.dispatchPropertyChange(this, 'shortcut', this.shortcut_,
-                                  oldShortcut);
+        cr.dispatchPropertyChange(this, 'shortcut', this.shortcut_, oldShortcut);
       }
     },
-
-    /**
-     * Whether the event object matches the shortcut for this command.
-     * @param {!Event} e The key event object.
-     * @return {boolean} Whether it matched or not.
-     */
     matchesEvent: function(e) {
-      if (!this.keyboardShortcuts_)
-        return false;
-
+      if (!this.keyboardShortcuts_) return false;
       return this.keyboardShortcuts_.some(function(keyboardShortcut) {
         return keyboardShortcut.matchesEvent(e);
       });
-    },
+    }
   };
-
-  /**
-   * The label of the command.
-   */
   cr.defineProperty(Command, 'label', cr.PropertyKind.ATTR);
-
-  /**
-   * Whether the command is disabled or not.
-   */
   cr.defineProperty(Command, 'disabled', cr.PropertyKind.BOOL_ATTR);
-
-  /**
-   * Whether the command is hidden or not.
-   */
   cr.defineProperty(Command, 'hidden', cr.PropertyKind.BOOL_ATTR);
-
-  /**
-   * Whether the command is checked or not.
-   */
   cr.defineProperty(Command, 'checked', cr.PropertyKind.BOOL_ATTR);
-
-  /**
-   * The flag that prevents the shortcut text from being displayed on menu.
-   *
-   * If false, the keyboard shortcut text (eg. "Ctrl+X" for the cut command)
-   * is displayed in menu when the command is assosiated with a menu item.
-   * Otherwise, no text is displayed.
-   */
   cr.defineProperty(Command, 'hideShortcutText', cr.PropertyKind.BOOL_ATTR);
-
-  /**
-   * Dispatches a canExecute event on the target.
-   * @param {!cr.ui.Command} command The command that we are testing for.
-   * @param {EventTarget} target The target element to dispatch the event on.
-   */
   function dispatchCanExecuteEvent(command, target) {
     var e = new CanExecuteEvent(command);
     target.dispatchEvent(e);
     command.disabled = !e.canExecute;
   }
-
-  /**
-   * The command managers for different documents.
-   */
   var commandManagers = {};
-
-  /**
-   * Keeps track of the focused element and updates the commands when the focus
-   * changes.
-   * @param {!Document} doc The document that we are managing the commands for.
-   * @constructor
-   */
   function CommandManager(doc) {
     doc.addEventListener('focus', this.handleFocus_.bind(this), true);
-    // Make sure we add the listener to the bubbling phase so that elements can
-    // prevent the command.
     doc.addEventListener('keydown', this.handleKeyDown_.bind(this), false);
   }
-
-  /**
-   * Initializes a command manager for the document as needed.
-   * @param {!Document} doc The document to manage the commands for.
-   */
   CommandManager.init = function(doc) {
     var uid = cr.getUid(doc);
     if (!(uid in commandManagers)) {
       commandManagers[uid] = new CommandManager(doc);
     }
   };
-
   CommandManager.prototype = {
-
-    /**
-     * Handles focus changes on the document.
-     * @param {Event} e The focus event object.
-     * @private
-     * @suppress {checkTypes}
-     * TODO(vitalyp): remove the suppression.
-     */
     handleFocus_: function(e) {
       var target = e.target;
-
-      // Ignore focus on a menu button or command item.
-      if (target.menu || target.command)
-        return;
-
-      var commands = Array.prototype.slice.call(
-          target.ownerDocument.querySelectorAll('command'));
-
+      if (target.menu || target.command) return;
+      var commands = Array.prototype.slice.call(target.ownerDocument.querySelectorAll('command'));
       commands.forEach(function(command) {
         dispatchCanExecuteEvent(command, target);
       });
     },
-
-    /**
-     * Handles the keydown event and routes it to the right command.
-     * @param {!Event} e The keydown event.
-     */
     handleKeyDown_: function(e) {
       var target = e.target;
-      var commands = Array.prototype.slice.call(
-          target.ownerDocument.querySelectorAll('command'));
-
+      var commands = Array.prototype.slice.call(target.ownerDocument.querySelectorAll('command'));
       for (var i = 0, command; command = commands[i]; i++) {
         if (command.matchesEvent(e)) {
-          // When invoking a command via a shortcut, we have to manually check
-          // if it can be executed, since focus might not have been changed
-          // what would have updated the command's state.
           command.canExecuteChange();
-
           if (!command.disabled) {
             e.preventDefault();
-            // We do not want any other element to handle this.
             e.stopPropagation();
             command.execute();
             return;
           }
         }
       }
     }
   };
-
-  /**
-   * The event type used for canExecute events.
-   * @param {!cr.ui.Command} command The command that we are evaluating.
-   * @extends {Event}
-   * @constructor
-   * @class
-   */
   function CanExecuteEvent(command) {
-    var e = new Event('canExecute', {bubbles: true, cancelable: true});
+    var e = new Event('canExecute', {
+      bubbles: true,
+      cancelable: true
+    });
     e.__proto__ = CanExecuteEvent.prototype;
     e.command = command;
     return e;
   }
-
   CanExecuteEvent.prototype = {
     __proto__: Event.prototype,
-
-    /**
-     * The current command
-     * @type {cr.ui.Command}
-     */
     command: null,
-
-    /**
-     * Whether the target can execute the command. Setting this also stops the
-     * propagation and prevents the default. Callers can tell if an event has
-     * been handled via |this.defaultPrevented|.
-     * @type {boolean}
-     */
     canExecute_: false,
     get canExecute() {
       return this.canExecute_;
     },
     set canExecute(canExecute) {
       this.canExecute_ = !!canExecute;
       this.stopPropagation();
       this.preventDefault();
     }
   };
-
-  // Export
   return {
     Command: Command,
     CanExecuteEvent: CanExecuteEvent
   };
 });
+
 Polymer({
-      is: 'app-drawer',
-
-      properties: {
-        /**
-         * The opened state of the drawer.
-         */
-        opened: {
-          type: Boolean,
-          value: false,
-          notify: true,
-          reflectToAttribute: true
-        },
-
-        /**
-         * The drawer does not have a scrim and cannot be swiped close.
-         */
-        persistent: {
-          type: Boolean,
-          value: false,
-          reflectToAttribute: true
-        },
-
-        /**
-         * The alignment of the drawer on the screen ('left', 'right', 'start' or 'end').
-         * 'start' computes to left and 'end' to right in LTR layout and vice versa in RTL
-         * layout.
-         */
-        align: {
-          type: String,
-          value: 'left'
-        },
-
-        /**
-         * The computed, read-only position of the drawer on the screen ('left' or 'right').
-         */
-        position: {
-          type: String,
-          readOnly: true,
-          value: 'left',
-          reflectToAttribute: true
-        },
-
-        /**
-         * Create an area at the edge of the screen to swipe open the drawer.
-         */
-        swipeOpen: {
-          type: Boolean,
-          value: false,
-          reflectToAttribute: true
-        },
-
-        /**
-         * Trap keyboard focus when the drawer is opened and not persistent.
-         */
-        noFocusTrap: {
-          type: Boolean,
-          value: false
-        }
-      },
-
-      observers: [
-        'resetLayout(position)',
-        '_resetPosition(align, isAttached)'
-      ],
-
-      _translateOffset: 0,
-
-      _trackDetails: null,
-
-      _drawerState: 0,
-
-      _boundEscKeydownHandler: null,
-
-      _firstTabStop: null,
-
-      _lastTabStop: null,
-
-      ready: function() {
-        // Set the scroll direction so you can vertically scroll inside the drawer.
-        this.setScrollDirection('y');
-
-        // Only transition the drawer after its first render (e.g. app-drawer-layout
-        // may need to set the initial opened state which should not be transitioned).
-        this._setTransitionDuration('0s');
-      },
-
-      attached: function() {
-        // Only transition the drawer after its first render (e.g. app-drawer-layout
-        // may need to set the initial opened state which should not be transitioned).
-        Polymer.RenderStatus.afterNextRender(this, function() {
-          this._setTransitionDuration('');
-          this._boundEscKeydownHandler = this._escKeydownHandler.bind(this);
-          this._resetDrawerState();
-
-          this.listen(this, 'track', '_track');
-          this.addEventListener('transitionend', this._transitionend.bind(this));
-          this.addEventListener('keydown', this._tabKeydownHandler.bind(this))
-        });
-      },
-
-      detached: function() {
+  is: 'app-drawer',
+  properties: {
+    opened: {
+      type: Boolean,
+      value: false,
+      notify: true,
+      reflectToAttribute: true
+    },
+    persistent: {
+      type: Boolean,
+      value: false,
+      reflectToAttribute: true
+    },
+    align: {
+      type: String,
+      value: 'left'
+    },
+    position: {
+      type: String,
+      readOnly: true,
+      value: 'left',
+      reflectToAttribute: true
+    },
+    swipeOpen: {
+      type: Boolean,
+      value: false,
+      reflectToAttribute: true
+    },
+    noFocusTrap: {
+      type: Boolean,
+      value: false
+    }
+  },
+  observers: [ 'resetLayout(position)', '_resetPosition(align, isAttached)' ],
+  _translateOffset: 0,
+  _trackDetails: null,
+  _drawerState: 0,
+  _boundEscKeydownHandler: null,
+  _firstTabStop: null,
+  _lastTabStop: null,
+  ready: function() {
+    this.setScrollDirection('y');
+    this._setTransitionDuration('0s');
+  },
+  attached: function() {
+    Polymer.RenderStatus.afterNextRender(this, function() {
+      this._setTransitionDuration('');
+      this._boundEscKeydownHandler = this._escKeydownHandler.bind(this);
+      this._resetDrawerState();
+      this.listen(this, 'track', '_track');
+      this.addEventListener('transitionend', this._transitionend.bind(this));
+      this.addEventListener('keydown', this._tabKeydownHandler.bind(this));
+    });
+  },
+  detached: function() {
+    document.removeEventListener('keydown', this._boundEscKeydownHandler);
+  },
+  open: function() {
+    this.opened = true;
+  },
+  close: function() {
+    this.opened = false;
+  },
+  toggle: function() {
+    this.opened = !this.opened;
+  },
+  getWidth: function() {
+    return this.$.contentContainer.offsetWidth;
+  },
+  resetLayout: function() {
+    this.debounce('_resetLayout', function() {
+      this.fire('app-drawer-reset-layout');
+    }, 1);
+  },
+  _isRTL: function() {
+    return window.getComputedStyle(this).direction === 'rtl';
+  },
+  _resetPosition: function() {
+    switch (this.align) {
+     case 'start':
+      this._setPosition(this._isRTL() ? 'right' : 'left');
+      return;
+
+     case 'end':
+      this._setPosition(this._isRTL() ? 'left' : 'right');
+      return;
+    }
+    this._setPosition(this.align);
+  },
+  _escKeydownHandler: function(event) {
+    var ESC_KEYCODE = 27;
+    if (event.keyCode === ESC_KEYCODE) {
+      event.preventDefault();
+      this.close();
+    }
+  },
+  _track: function(event) {
+    if (this.persistent) {
+      return;
+    }
+    event.preventDefault();
+    switch (event.detail.state) {
+     case 'start':
+      this._trackStart(event);
+      break;
+
+     case 'track':
+      this._trackMove(event);
+      break;
+
+     case 'end':
+      this._trackEnd(event);
+      break;
+    }
+  },
+  _trackStart: function(event) {
+    this._drawerState = this._DRAWER_STATE.TRACKING;
+    this._setTransitionDuration('0s');
+    this.style.visibility = 'visible';
+    var rect = this.$.contentContainer.getBoundingClientRect();
+    if (this.position === 'left') {
+      this._translateOffset = rect.left;
+    } else {
+      this._translateOffset = rect.right - window.innerWidth;
+    }
+    this._trackDetails = [];
+  },
+  _trackMove: function(event) {
+    this._translateDrawer(event.detail.dx + this._translateOffset);
+    this._trackDetails.push({
+      dx: event.detail.dx,
+      timeStamp: Date.now()
+    });
+  },
+  _trackEnd: function(event) {
+    var x = event.detail.dx + this._translateOffset;
+    var drawerWidth = this.getWidth();
+    var isPositionLeft = this.position === 'left';
+    var isInEndState = isPositionLeft ? x >= 0 || x <= -drawerWidth : x <= 0 || x >= drawerWidth;
+    if (!isInEndState) {
+      var trackDetails = this._trackDetails;
+      this._trackDetails = null;
+      this._flingDrawer(event, trackDetails);
+      if (this._drawerState === this._DRAWER_STATE.FLINGING) {
+        return;
+      }
+    }
+    var halfWidth = drawerWidth / 2;
+    if (event.detail.dx < -halfWidth) {
+      this.opened = this.position === 'right';
+    } else if (event.detail.dx > halfWidth) {
+      this.opened = this.position === 'left';
+    }
+    if (isInEndState) {
+      this._resetDrawerState();
+    }
+    this._setTransitionDuration('');
+    this._resetDrawerTranslate();
+    this.style.visibility = '';
+  },
+  _calculateVelocity: function(event, trackDetails) {
+    var now = Date.now();
+    var timeLowerBound = now - 100;
+    var trackDetail;
+    var min = 0;
+    var max = trackDetails.length - 1;
+    while (min <= max) {
+      var mid = min + max >> 1;
+      var d = trackDetails[mid];
+      if (d.timeStamp >= timeLowerBound) {
+        trackDetail = d;
+        max = mid - 1;
+      } else {
+        min = mid + 1;
+      }
+    }
+    if (trackDetail) {
+      var dx = event.detail.dx - trackDetail.dx;
+      var dt = now - trackDetail.timeStamp || 1;
+      return dx / dt;
+    }
+    return 0;
+  },
+  _flingDrawer: function(event, trackDetails) {
+    var velocity = this._calculateVelocity(event, trackDetails);
+    if (Math.abs(velocity) < this._MIN_FLING_THRESHOLD) {
+      return;
+    }
+    this._drawerState = this._DRAWER_STATE.FLINGING;
+    var x = event.detail.dx + this._translateOffset;
+    var drawerWidth = this.getWidth();
+    var isPositionLeft = this.position === 'left';
+    var isVelocityPositive = velocity > 0;
+    var isClosingLeft = !isVelocityPositive && isPositionLeft;
+    var isClosingRight = isVelocityPositive && !isPositionLeft;
+    var dx;
+    if (isClosingLeft) {
+      dx = -(x + drawerWidth);
+    } else if (isClosingRight) {
+      dx = drawerWidth - x;
+    } else {
+      dx = -x;
+    }
+    if (isVelocityPositive) {
+      velocity = Math.max(velocity, this._MIN_TRANSITION_VELOCITY);
+      this.opened = this.position === 'left';
+    } else {
+      velocity = Math.min(velocity, -this._MIN_TRANSITION_VELOCITY);
+      this.opened = this.position === 'right';
+    }
+    this._setTransitionDuration(this._FLING_INITIAL_SLOPE * dx / velocity + 'ms');
+    this._setTransitionTimingFunction(this._FLING_TIMING_FUNCTION);
+    this._resetDrawerTranslate();
+  },
+  _transitionend: function(event) {
+    var target = Polymer.dom(event).rootTarget;
+    if (target === this.$.contentContainer || target === this.$.scrim) {
+      if (this._drawerState === this._DRAWER_STATE.FLINGING) {
+        this._setTransitionDuration('');
+        this._setTransitionTimingFunction('');
+        this.style.visibility = '';
+      }
+      this._resetDrawerState();
+    }
+  },
+  _setTransitionDuration: function(duration) {
+    this.$.contentContainer.style.transitionDuration = duration;
+    this.$.scrim.style.transitionDuration = duration;
+  },
+  _setTransitionTimingFunction: function(timingFunction) {
+    this.$.contentContainer.style.transitionTimingFunction = timingFunction;
+    this.$.scrim.style.transitionTimingFunction = timingFunction;
+  },
+  _translateDrawer: function(x) {
+    var drawerWidth = this.getWidth();
+    if (this.position === 'left') {
+      x = Math.max(-drawerWidth, Math.min(x, 0));
+      this.$.scrim.style.opacity = 1 + x / drawerWidth;
+    } else {
+      x = Math.max(0, Math.min(x, drawerWidth));
+      this.$.scrim.style.opacity = 1 - x / drawerWidth;
+    }
+    this.translate3d(x + 'px', '0', '0', this.$.contentContainer);
+  },
+  _resetDrawerTranslate: function() {
+    this.$.scrim.style.opacity = '';
+    this.transform('', this.$.contentContainer);
+  },
+  _resetDrawerState: function() {
+    var oldState = this._drawerState;
+    if (this.opened) {
+      this._drawerState = this.persistent ? this._DRAWER_STATE.OPENED_PERSISTENT : this._DRAWER_STATE.OPENED;
+    } else {
+      this._drawerState = this._DRAWER_STATE.CLOSED;
+    }
+    if (oldState !== this._drawerState) {
+      if (this._drawerState === this._DRAWER_STATE.OPENED) {
+        this._setKeyboardFocusTrap();
+        document.addEventListener('keydown', this._boundEscKeydownHandler);
+        document.body.style.overflow = 'hidden';
+      } else {
         document.removeEventListener('keydown', this._boundEscKeydownHandler);
-      },
-
-      /**
-       * Opens the drawer.
-       */
-      open: function() {
-        this.opened = true;
-      },
-
-      /**
-       * Closes the drawer.
-       */
-      close: function() {
-        this.opened = false;
-      },
-
-      /**
-       * Toggles the drawer open and close.
-       */
-      toggle: function() {
-        this.opened = !this.opened;
-      },
-
-      /**
-       * Gets the width of the drawer.
-       *
-       * @return {number} The width of the drawer in pixels.
-       */
-      getWidth: function() {
-        return this.$.contentContainer.offsetWidth;
-      },
-
-      /**
-       * Resets the layout. If you changed the size of app-header via CSS
-       * you can notify the changes by either firing the `iron-resize` event
-       * or calling `resetLayout` directly.
-       *
-       * @method resetLayout
-       */
-      resetLayout: function() {
-        this.debounce('_resetLayout', function() {
-          this.fire('app-drawer-reset-layout');
-        }, 1);
-      },
-
-      _isRTL: function() {
-        return window.getComputedStyle(this).direction === 'rtl';
-      },
-
-      _resetPosition: function() {
-        switch (this.align) {
-          case 'start':
-            this._setPosition(this._isRTL() ? 'right' : 'left');
-            return;
-          case 'end':
-            this._setPosition(this._isRTL() ? 'left' : 'right');
-            return;
-        }
-        this._setPosition(this.align);
-      },
-
-      _escKeydownHandler: function(event) {
-        var ESC_KEYCODE = 27;
-        if (event.keyCode === ESC_KEYCODE) {
-          // Prevent any side effects if app-drawer closes.
+        document.body.style.overflow = '';
+      }
+      if (oldState !== this._DRAWER_STATE.INIT) {
+        this.fire('app-drawer-transitioned');
+      }
+    }
+  },
+  _setKeyboardFocusTrap: function() {
+    if (this.noFocusTrap) {
+      return;
+    }
+    var focusableElementsSelector = [ 'a[href]:not([tabindex="-1"])', 'area[href]:not([tabindex="-1"])', 'input:not([disabled]):not([tabindex="-1"])', 'select:not([disabled]):not([tabindex="-1"])', 'textarea:not([disabled]):not([tabindex="-1"])', 'button:not([disabled]):not([tabindex="-1"])', 'iframe:not([tabindex="-1"])', '[tabindex]:not([tabindex="-1"])', '[contentEditable=true]:not([tabindex="-1"])' ].join(',');
+    var focusableElements = Polymer.dom(this).querySelectorAll(focusableElementsSelector);
+    if (focusableElements.length > 0) {
+      this._firstTabStop = focusableElements[0];
+      this._lastTabStop = focusableElements[focusableElements.length - 1];
+    } else {
+      this._firstTabStop = null;
+      this._lastTabStop = null;
+    }
+    var tabindex = this.getAttribute('tabindex');
+    if (tabindex && parseInt(tabindex, 10) > -1) {
+      this.focus();
+    } else if (this._firstTabStop) {
+      this._firstTabStop.focus();
+    }
+  },
+  _tabKeydownHandler: function(event) {
+    if (this.noFocusTrap) {
+      return;
+    }
+    var TAB_KEYCODE = 9;
+    if (this._drawerState === this._DRAWER_STATE.OPENED && event.keyCode === TAB_KEYCODE) {
+      if (event.shiftKey) {
+        if (this._firstTabStop && Polymer.dom(event).localTarget === this._firstTabStop) {
           event.preventDefault();
-          this.close();
-        }
-      },
-
-      _track: function(event) {
-        if (this.persistent) {
-          return;
-        }
-
-        // Disable user selection on desktop.
-        event.preventDefault();
-
-        switch (event.detail.state) {
-          case 'start':
-            this._trackStart(event);
-            break;
-          case 'track':
-            this._trackMove(event);
-            break;
-          case 'end':
-            this._trackEnd(event);
-            break;
-        }
-      },
-
-      _trackStart: function(event) {
-        this._drawerState = this._DRAWER_STATE.TRACKING;
-
-        // Disable transitions since style attributes will reflect user track events.
-        this._setTransitionDuration('0s');
-        this.style.visibility = 'visible';
-
-        var rect = this.$.contentContainer.getBoundingClientRect();
-        if (this.position === 'left') {
-          this._translateOffset = rect.left;
-        } else {
-          this._translateOffset = rect.right - window.innerWidth;
-        }
-
-        this._trackDetails = [];
-      },
-
-      _trackMove: function(event) {
-        this._translateDrawer(event.detail.dx + this._translateOffset);
-
-        // Use Date.now() since event.timeStamp is inconsistent across browsers (e.g. most
-        // browsers use milliseconds but FF 44 uses microseconds).
-        this._trackDetails.push({
-          dx: event.detail.dx,
-          timeStamp: Date.now()
-        });
-      },
-
-      _trackEnd: function(event) {
-        var x = event.detail.dx + this._translateOffset;
-        var drawerWidth = this.getWidth();
-        var isPositionLeft = this.position === 'left';
-        var isInEndState = isPositionLeft ? (x >= 0 || x <= -drawerWidth) :
-          (x <= 0 || x >= drawerWidth);
-
-        if (!isInEndState) {
-          // No longer need the track events after this method returns - allow them to be GC'd.
-          var trackDetails = this._trackDetails;
-          this._trackDetails = null;
-
-          this._flingDrawer(event, trackDetails);
-          if (this._drawerState === this._DRAWER_STATE.FLINGING) {
-            return;
-          }
-        }
-
-        // If the drawer is not flinging, toggle the opened state based on the position of
-        // the drawer.
-        var halfWidth = drawerWidth / 2;
-        if (event.detail.dx < -halfWidth) {
-          this.opened = this.position === 'right';
-        } else if (event.detail.dx > halfWidth) {
-          this.opened = this.position === 'left';
-        }
-
-        // Trigger app-drawer-transitioned now since there will be no transitionend event.
-        if (isInEndState) {
-          this._resetDrawerState();
-        }
-
-        this._setTransitionDuration('');
-        this._resetDrawerTranslate();
-        this.style.visibility = '';
-      },
-
-      _calculateVelocity: function(event, trackDetails) {
-        // Find the oldest track event that is within 100ms using binary search.
-        var now = Date.now();
-        var timeLowerBound = now - 100;
-        var trackDetail;
-        var min = 0;
-        var max = trackDetails.length - 1;
-
-        while (min <= max) {
-          // Floor of average of min and max.
-          var mid = (min + max) >> 1;
-          var d = trackDetails[mid];
-          if (d.timeStamp >= timeLowerBound) {
-            trackDetail = d;
-            max = mid - 1;
-          } else {
-            min = mid + 1;
-          }
-        }
-
-        if (trackDetail) {
-          var dx = event.detail.dx - trackDetail.dx;
-          var dt = (now - trackDetail.timeStamp) || 1;
-          return dx / dt;
-        }
-        return 0;
-      },
-
-      _flingDrawer: function(event, trackDetails) {
-        var velocity = this._calculateVelocity(event, trackDetails);
-
-        // Do not fling if velocity is not above a threshold.
-        if (Math.abs(velocity) < this._MIN_FLING_THRESHOLD) {
-          return;
-        }
-
-        this._drawerState = this._DRAWER_STATE.FLINGING;
-
-        var x = event.detail.dx + this._translateOffset;
-        var drawerWidth = this.getWidth();
-        var isPositionLeft = this.position === 'left';
-        var isVelocityPositive = velocity > 0;
-        var isClosingLeft = !isVelocityPositive && isPositionLeft;
-        var isClosingRight = isVelocityPositive && !isPositionLeft;
-        var dx;
-        if (isClosingLeft) {
-          dx = -(x + drawerWidth);
-        } else if (isClosingRight) {
-          dx = (drawerWidth - x);
-        } else {
-          dx = -x;
-        }
-
-        // Enforce a minimum transition velocity to make the drawer feel snappy.
-        if (isVelocityPositive) {
-          velocity = Math.max(velocity, this._MIN_TRANSITION_VELOCITY);
-          this.opened = this.position === 'left';
-        } else {
-          velocity = Math.min(velocity, -this._MIN_TRANSITION_VELOCITY);
-          this.opened = this.position === 'right';
-        }
-
-        // Calculate the amount of time needed to finish the transition based on the
-        // initial slope of the timing function.
-        this._setTransitionDuration((this._FLING_INITIAL_SLOPE * dx / velocity) + 'ms');
-        this._setTransitionTimingFunction(this._FLING_TIMING_FUNCTION);
-
-        this._resetDrawerTranslate();
-      },
-
-      _transitionend: function(event) {
-        // contentContainer will transition on opened state changed, and scrim will
-        // transition on persistent state changed when opened - these are the
-        // transitions we are interested in.
-        var target = Polymer.dom(event).rootTarget;
-        if (target === this.$.contentContainer || target === this.$.scrim) {
-
-          // If the drawer was flinging, we need to reset the style attributes.
-          if (this._drawerState === this._DRAWER_STATE.FLINGING) {
-            this._setTransitionDuration('');
-            this._setTransitionTimingFunction('');
-            this.style.visibility = '';
-          }
-
-          this._resetDrawerState();
-        }
-      },
-
-      _setTransitionDuration: function(duration) {
-        this.$.contentContainer.style.transitionDuration = duration;
-        this.$.scrim.style.transitionDuration = duration;
-      },
-
-      _setTransitionTimingFunction: function(timingFunction) {
-        this.$.contentContainer.style.transitionTimingFunction = timingFunction;
-        this.$.scrim.style.transitionTimingFunction = timingFunction;
-      },
-
-      _translateDrawer: function(x) {
-        var drawerWidth = this.getWidth();
-
-        if (this.position === 'left') {
-          x = Math.max(-drawerWidth, Math.min(x, 0));
-          this.$.scrim.style.opacity = 1 + x / drawerWidth;
-        } else {
-          x = Math.max(0, Math.min(x, drawerWidth));
-          this.$.scrim.style.opacity = 1 - x / drawerWidth;
-        }
-
-        this.translate3d(x + 'px', '0', '0', this.$.contentContainer);
-      },
-
-      _resetDrawerTranslate: function() {
-        this.$.scrim.style.opacity = '';
-        this.transform('', this.$.contentContainer);
-      },
-
-      _resetDrawerState: function() {
-        var oldState = this._drawerState;
-        if (this.opened) {
-          this._drawerState = this.persistent ?
-            this._DRAWER_STATE.OPENED_PERSISTENT : this._DRAWER_STATE.OPENED;
-        } else {
-          this._drawerState = this._DRAWER_STATE.CLOSED;
-        }
-
-        if (oldState !== this._drawerState) {
-          if (this._drawerState === this._DRAWER_STATE.OPENED) {
-            this._setKeyboardFocusTrap();
-            document.addEventListener('keydown', this._boundEscKeydownHandler);
-            document.body.style.overflow = 'hidden';
-          } else {
-            document.removeEventListener('keydown', this._boundEscKeydownHandler);
-            document.body.style.overflow = '';
-          }
-
-          // Don't fire the event on initial load.
-          if (oldState !== this._DRAWER_STATE.INIT) {
-            this.fire('app-drawer-transitioned');
-          }
-        }
-      },
-
-      _setKeyboardFocusTrap: function() {
-        if (this.noFocusTrap) {
-          return;
-        }
-
-        // NOTE: Unless we use /deep/ (which we shouldn't since it's deprecated), this will
-        // not select focusable elements inside shadow roots.
-        var focusableElementsSelector = [
-            'a[href]:not([tabindex="-1"])',
-            'area[href]:not([tabindex="-1"])',
-            'input:not([disabled]):not([tabindex="-1"])',
-            'select:not([disabled]):not([tabindex="-1"])',
-            'textarea:not([disabled]):not([tabindex="-1"])',
-            'button:not([disabled]):not([tabindex="-1"])',
-            'iframe:not([tabindex="-1"])',
-            '[tabindex]:not([tabindex="-1"])',
-            '[contentEditable=true]:not([tabindex="-1"])'
-          ].join(',');
-        var focusableElements = Polymer.dom(this).querySelectorAll(focusableElementsSelector);
-
-        if (focusableElements.length > 0) {
-          this._firstTabStop = focusableElements[0];
-          this._lastTabStop = focusableElements[focusableElements.length - 1];
-        } else {
-          // Reset saved tab stops when there are no focusable elements in the drawer.
-          this._firstTabStop = null;
-          this._lastTabStop = null;
-        }
-
-        // Focus on app-drawer if it has non-zero tabindex. Otherwise, focus the first focusable
-        // element in the drawer, if it exists. Use the tabindex attribute since the this.tabIndex
-        // property in IE/Edge returns 0 (instead of -1) when the attribute is not set.
-        var tabindex = this.getAttribute('tabindex');
-        if (tabindex && parseInt(tabindex, 10) > -1) {
-          this.focus();
-        } else if (this._firstTabStop) {
+          this._lastTabStop.focus();
+        }
+      } else {
+        if (this._lastTabStop && Polymer.dom(event).localTarget === this._lastTabStop) {
+          event.preventDefault();
           this._firstTabStop.focus();
         }
-      },
-
-      _tabKeydownHandler: function(event) {
-        if (this.noFocusTrap) {
-          return;
-        }
-
-        var TAB_KEYCODE = 9;
-        if (this._drawerState === this._DRAWER_STATE.OPENED && event.keyCode === TAB_KEYCODE) {
-          if (event.shiftKey) {
-            if (this._firstTabStop && Polymer.dom(event).localTarget === this._firstTabStop) {
-              event.preventDefault();
-              this._lastTabStop.focus();
-            }
-          } else {
-            if (this._lastTabStop && Polymer.dom(event).localTarget === this._lastTabStop) {
-              event.preventDefault();
-              this._firstTabStop.focus();
-            }
-          }
-        }
-      },
-
-      _MIN_FLING_THRESHOLD: 0.2,
-
-      _MIN_TRANSITION_VELOCITY: 1.2,
-
-      _FLING_TIMING_FUNCTION: 'cubic-bezier(0.667, 1, 0.667, 1)',
-
-      _FLING_INITIAL_SLOPE: 1.5,
-
-      _DRAWER_STATE: {
-        INIT: 0,
-        OPENED: 1,
-        OPENED_PERSISTENT: 2,
-        CLOSED: 3,
-        TRACKING: 4,
-        FLINGING: 5
-      }
-
-      /**
-       * Fired when the layout of app-drawer has changed.
-       *
-       * @event app-drawer-reset-layout
-       */
-
-      /**
-       * Fired when app-drawer has finished transitioning.
-       *
-       * @event app-drawer-transitioned
-       */
-    });
+      }
+    }
+  },
+  _MIN_FLING_THRESHOLD: .2,
+  _MIN_TRANSITION_VELOCITY: 1.2,
+  _FLING_TIMING_FUNCTION: 'cubic-bezier(0.667, 1, 0.667, 1)',
+  _FLING_INITIAL_SLOPE: 1.5,
+  _DRAWER_STATE: {
+    INIT: 0,
+    OPENED: 1,
+    OPENED_PERSISTENT: 2,
+    CLOSED: 3,
+    TRACKING: 4,
+    FLINGING: 5
+  }
+});
+
 (function() {
-    'use strict';
-
-    Polymer({
-      is: 'iron-location',
-      properties: {
-        /**
-         * The pathname component of the URL.
-         */
-        path: {
-          type: String,
-          notify: true,
-          value: function() {
-            return window.decodeURIComponent(window.location.pathname);
-          }
-        },
-        /**
-         * The query string portion of the URL.
-         */
-        query: {
-          type: String,
-          notify: true,
-          value: function() {
-            return window.decodeURIComponent(window.location.search.slice(1));
-          }
-        },
-        /**
-         * The hash component of the URL.
-         */
-        hash: {
-          type: String,
-          notify: true,
-          value: function() {
-            return window.decodeURIComponent(window.location.hash.slice(1));
-          }
-        },
-        /**
-         * If the user was on a URL for less than `dwellTime` milliseconds, it
-         * won't be added to the browser's history, but instead will be replaced
-         * by the next entry.
-         *
-         * This is to prevent large numbers of entries from clogging up the user's
-         * browser history. Disable by setting to a negative number.
-         */
-        dwellTime: {
-          type: Number,
-          value: 2000
-        },
-
-        /**
-         * A regexp that defines the set of URLs that should be considered part
-         * of this web app.
-         *
-         * Clicking on a link that matches this regex won't result in a full page
-         * navigation, but will instead just update the URL state in place.
-         *
-         * This regexp is given everything after the origin in an absolute
-         * URL. So to match just URLs that start with /search/ do:
-         *     url-space-regex="^/search/"
-         *
-         * @type {string|RegExp}
-         */
-        urlSpaceRegex: {
-          type: String,
-          value: ''
-        },
-
-        /**
-         * urlSpaceRegex, but coerced into a regexp.
-         *
-         * @type {RegExp}
-         */
-        _urlSpaceRegExp: {
-          computed: '_makeRegExp(urlSpaceRegex)'
-        },
-
-        _lastChangedAt: {
-          type: Number
-        },
-
-        _initialized: {
-          type: Boolean,
-          value: false
-        }
-      },
-      hostAttributes: {
-        hidden: true
-      },
-      observers: [
-        '_updateUrl(path, query, hash)'
-      ],
-      attached: function() {
-        this.listen(window, 'hashchange', '_hashChanged');
-        this.listen(window, 'location-changed', '_urlChanged');
-        this.listen(window, 'popstate', '_urlChanged');
-        this.listen(/** @type {!HTMLBodyElement} */(document.body), 'click', '_globalOnClick');
-        // Give a 200ms grace period to make initial redirects without any
-        // additions to the user's history.
-        this._lastChangedAt = window.performance.now() - (this.dwellTime - 200);
-
-        this._initialized = true;
-        this._urlChanged();
-      },
-      detached: function() {
-        this.unlisten(window, 'hashchange', '_hashChanged');
-        this.unlisten(window, 'location-changed', '_urlChanged');
-        this.unlisten(window, 'popstate', '_urlChanged');
-        this.unlisten(/** @type {!HTMLBodyElement} */(document.body), 'click', '_globalOnClick');
-        this._initialized = false;
-      },
-      _hashChanged: function() {
-        this.hash = window.decodeURIComponent(window.location.hash.substring(1));
-      },
-      _urlChanged: function() {
-        // We want to extract all info out of the updated URL before we
-        // try to write anything back into it.
-        //
-        // i.e. without _dontUpdateUrl we'd overwrite the new path with the old
-        // one when we set this.hash. Likewise for query.
-        this._dontUpdateUrl = true;
-        this._hashChanged();
-        this.path = window.decodeURIComponent(window.location.pathname);
-        this.query = window.decodeURIComponent(
-            window.location.search.substring(1));
-        this._dontUpdateUrl = false;
-        this._updateUrl();
-      },
-      _getUrl: function() {
-        var partiallyEncodedPath = window.encodeURI(
-            this.path).replace(/\#/g, '%23').replace(/\?/g, '%3F');
-        var partiallyEncodedQuery = '';
-        if (this.query) {
-          partiallyEncodedQuery = '?' + window.encodeURI(
-              this.query).replace(/\#/g, '%23');
-        }
-        var partiallyEncodedHash = '';
-        if (this.hash) {
-          partiallyEncodedHash = '#' + window.encodeURI(this.hash);
-        }
-        return (
-            partiallyEncodedPath + partiallyEncodedQuery + partiallyEncodedHash);
-      },
-      _updateUrl: function() {
-        if (this._dontUpdateUrl || !this._initialized) {
-          return;
-        }
-        if (this.path === window.decodeURIComponent(window.location.pathname) &&
-            this.query === window.decodeURIComponent(
-                window.location.search.substring(1)) &&
-            this.hash === window.decodeURIComponent(
-                window.location.hash.substring(1))) {
-          // Nothing to do, the current URL is a representation of our properties.
-          return;
-        }
-        var newUrl = this._getUrl();
-        // Need to use a full URL in case the containing page has a base URI.
-        var fullNewUrl = new URL(
-            newUrl, window.location.protocol + '//' + window.location.host).href;
-        var now = window.performance.now();
-        var shouldReplace =
-            this._lastChangedAt + this.dwellTime > now;
-        this._lastChangedAt = now;
-        if (shouldReplace) {
-          window.history.replaceState({}, '', fullNewUrl);
-        } else {
-          window.history.pushState({}, '', fullNewUrl);
-        }
-        this.fire('location-changed', {}, {node: window});
-      },
-      /**
-       * A necessary evil so that links work as expected. Does its best to
-       * bail out early if possible.
-       *
-       * @param {MouseEvent} event .
-       */
-      _globalOnClick: function(event) {
-        // If another event handler has stopped this event then there's nothing
-        // for us to do. This can happen e.g. when there are multiple
-        // iron-location elements in a page.
-        if (event.defaultPrevented) {
-          return;
-        }
-        var href = this._getSameOriginLinkHref(event);
-        if (!href) {
-          return;
-        }
-        event.preventDefault();
-        // If the navigation is to the current page we shouldn't add a history
-        // entry or fire a change event.
-        if (href === window.location.href) {
-          return;
-        }
-        window.history.pushState({}, '', href);
-        this.fire('location-changed', {}, {node: window});
-      },
-      /**
-       * Returns the absolute URL of the link (if any) that this click event
-       * is clicking on, if we can and should override the resulting full
-       * page navigation. Returns null otherwise.
-       *
-       * @param {MouseEvent} event .
-       * @return {string?} .
-       */
-      _getSameOriginLinkHref: function(event) {
-        // We only care about left-clicks.
-        if (event.button !== 0) {
-          return null;
-        }
-        // We don't want modified clicks, where the intent is to open the page
-        // in a new tab.
-        if (event.metaKey || event.ctrlKey) {
-          return null;
-        }
-        var eventPath = Polymer.dom(event).path;
-        var anchor = null;
-        for (var i = 0; i < eventPath.length; i++) {
-          var element = eventPath[i];
-          if (element.tagName === 'A' && element.href) {
-            anchor = element;
-            break;
-          }
-        }
-
-        // If there's no link there's nothing to do.
-        if (!anchor) {
-          return null;
-        }
-
-        // Target blank is a new tab, don't intercept.
-        if (anchor.target === '_blank') {
-          return null;
-        }
-        // If the link is for an existing parent frame, don't intercept.
-        if ((anchor.target === '_top' ||
-             anchor.target === '_parent') &&
-            window.top !== window) {
-          return null;
-        }
-
-        var href = anchor.href;
-
-        // It only makes sense for us to intercept same-origin navigations.
-        // pushState/replaceState don't work with cross-origin links.
-        var url;
-        if (document.baseURI != null) {
-          url = new URL(href, /** @type {string} */(document.baseURI));
-        } else {
-          url = new URL(href);
-        }
-
-        var origin;
-
-        // IE Polyfill
-        if (window.location.origin) {
-          origin = window.location.origin;
-        } else {
-          origin = window.location.protocol + '//' + window.location.hostname;
-
-          if (window.location.port) {
-            origin += ':' + window.location.port;
-          }
-        }
-
-        if (url.origin !== origin) {
-          return null;
-        }
-        var normalizedHref = url.pathname + url.search + url.hash;
-
-        // If we've been configured not to handle this url... don't handle it!
-        if (this._urlSpaceRegExp &&
-            !this._urlSpaceRegExp.test(normalizedHref)) {
-          return null;
-        }
-        // Need to use a full URL in case the containing page has a base URI.
-        var fullNormalizedHref = new URL(
-            normalizedHref, window.location.href).href;
-        return fullNormalizedHref;
-      },
-      _makeRegExp: function(urlSpaceRegex) {
-        return RegExp(urlSpaceRegex);
-      }
-    });
-  })();
-'use strict';
-
+  'use strict';
   Polymer({
-    is: 'iron-query-params',
+    is: 'iron-location',
     properties: {
-      paramsString: {
+      path: {
         type: String,
         notify: true,
-        observer: 'paramsStringChanged',
-      },
-      paramsObject: {
-        type: Object,
+        value: function() {
+          return window.decodeURIComponent(window.location.pathname);
+        }
+      },
+      query: {
+        type: String,
         notify: true,
         value: function() {
-          return {};
-        }
-      },
-      _dontReact: {
+          return window.decodeURIComponent(window.location.search.slice(1));
+        }
+      },
+      hash: {
+        type: String,
+        notify: true,
+        value: function() {
+          return window.decodeURIComponent(window.location.hash.slice(1));
+        }
+      },
+      dwellTime: {
+        type: Number,
+        value: 2e3
+      },
+      urlSpaceRegex: {
+        type: String,
+        value: ''
+      },
+      _urlSpaceRegExp: {
+        computed: '_makeRegExp(urlSpaceRegex)'
+      },
+      _lastChangedAt: {
+        type: Number
+      },
+      _initialized: {
         type: Boolean,
         value: false
       }
     },
     hostAttributes: {
       hidden: true
     },
-    observers: [
-      'paramsObjectChanged(paramsObject.*)'
-    ],
-    paramsStringChanged: function() {
-      this._dontReact = true;
-      this.paramsObject = this._decodeParams(this.paramsString);
-      this._dontReact = false;
-    },
-    paramsObjectChanged: function() {
-      if (this._dontReact) {
+    observers: [ '_updateUrl(path, query, hash)' ],
+    attached: function() {
+      this.listen(window, 'hashchange', '_hashChanged');
+      this.listen(window, 'location-changed', '_urlChanged');
+      this.listen(window, 'popstate', '_urlChanged');
+      this.listen(document.body, 'click', '_globalOnClick');
+      this._lastChangedAt = window.performance.now() - (this.dwellTime - 200);
+      this._initialized = true;
+      this._urlChanged();
+    },
+    detached: function() {
+      this.unlisten(window, 'hashchange', '_hashChanged');
+      this.unlisten(window, 'location-changed', '_urlChanged');
+      this.unlisten(window, 'popstate', '_urlChanged');
+      this.unlisten(document.body, 'click', '_globalOnClick');
+      this._initialized = false;
+    },
+    _hashChanged: function() {
+      this.hash = window.decodeURIComponent(window.location.hash.substring(1));
+    },
+    _urlChanged: function() {
+      this._dontUpdateUrl = true;
+      this._hashChanged();
+      this.path = window.decodeURIComponent(window.location.pathname);
+      this.query = window.decodeURIComponent(window.location.search.substring(1));
+      this._dontUpdateUrl = false;
+      this._updateUrl();
+    },
+    _getUrl: function() {
+      var partiallyEncodedPath = window.encodeURI(this.path).replace(/\#/g, '%23').replace(/\?/g, '%3F');
+      var partiallyEncodedQuery = '';
+      if (this.query) {
+        partiallyEncodedQuery = '?' + window.encodeURI(this.query).replace(/\#/g, '%23');
+      }
+      var partiallyEncodedHash = '';
+      if (this.hash) {
+        partiallyEncodedHash = '#' + window.encodeURI(this.hash);
+      }
+      return partiallyEncodedPath + partiallyEncodedQuery + partiallyEncodedHash;
+    },
+    _updateUrl: function() {
+      if (this._dontUpdateUrl || !this._initialized) {
         return;
       }
-      this.paramsString = this._encodeParams(this.paramsObject);
-    },
-    _encodeParams: function(params) {
-      var encodedParams = [];
-      for (var key in params) {
-        var value = params[key];
-        if (value === '') {
-          encodedParams.push(encodeURIComponent(key));
-        } else if (value) {
-          encodedParams.push(
-              encodeURIComponent(key) +
-              '=' +
-              encodeURIComponent(value.toString())
-          );
+      if (this.path === window.decodeURIComponent(window.location.pathname) && this.query === window.decodeURIComponent(window.location.search.substring(1)) && this.hash === window.decodeURIComponent(window.location.hash.substring(1))) {
+        return;
+      }
+      var newUrl = this._getUrl();
+      var fullNewUrl = new URL(newUrl, window.location.protocol + '//' + window.location.host).href;
+      var now = window.performance.now();
+      var shouldReplace = this._lastChangedAt + this.dwellTime > now;
+      this._lastChangedAt = now;
+      if (shouldReplace) {
+        window.history.replaceState({}, '', fullNewUrl);
+      } else {
+        window.history.pushState({}, '', fullNewUrl);
+      }
+      this.fire('location-changed', {}, {
+        node: window
+      });
+    },
+    _globalOnClick: function(event) {
+      if (event.defaultPrevented) {
+        return;
+      }
+      var href = this._getSameOriginLinkHref(event);
+      if (!href) {
+        return;
+      }
+      event.preventDefault();
+      if (href === window.location.href) {
+        return;
+      }
+      window.history.pushState({}, '', href);
+      this.fire('location-changed', {}, {
+        node: window
+      });
+    },
+    _getSameOriginLinkHref: function(event) {
+      if (event.button !== 0) {
+        return null;
+      }
+      if (event.metaKey || event.ctrlKey) {
+        return null;
+      }
+      var eventPath = Polymer.dom(event).path;
+      var anchor = null;
+      for (var i = 0; i < eventPath.length; i++) {
+        var element = eventPath[i];
+        if (element.tagName === 'A' && element.href) {
+          anchor = element;
+          break;
         }
       }
-      return encodedParams.join('&');
-    },
-    _decodeParams: function(paramString) {
-      var params = {};
-
-      // Work around a bug in decodeURIComponent where + is not
-      // converted to spaces:
-      paramString = (paramString || '').replace(/\+/g, '%20');
-
-      var paramList = paramString.split('&');
-      for (var i = 0; i < paramList.length; i++) {
-        var param = paramList[i].split('=');
-        if (param[0]) {
-          params[decodeURIComponent(param[0])] =
-              decodeURIComponent(param[1] || '');
+      if (!anchor) {
+        return null;
+      }
+      if (anchor.target === '_blank') {
+        return null;
+      }
+      if ((anchor.target === '_top' || anchor.target === '_parent') && window.top !== window) {
+        return null;
+      }
+      var href = anchor.href;
+      var url;
+      if (document.baseURI != null) {
+        url = new URL(href, document.baseURI);
+      } else {
+        url = new URL(href);
+      }
+      var origin;
+      if (window.location.origin) {
+        origin = window.location.origin;
+      } else {
+        origin = window.location.protocol + '//' + window.location.hostname;
+        if (window.location.port) {
+          origin += ':' + window.location.port;
         }
       }
-      return params;
+      if (url.origin !== origin) {
+        return null;
+      }
+      var normalizedHref = url.pathname + url.search + url.hash;
+      if (this._urlSpaceRegExp && !this._urlSpaceRegExp.test(normalizedHref)) {
+        return null;
+      }
+      var fullNormalizedHref = new URL(normalizedHref, window.location.href).href;
+      return fullNormalizedHref;
+    },
+    _makeRegExp: function(urlSpaceRegex) {
+      return RegExp(urlSpaceRegex);
     }
   });
+})();
+
 'use strict';
 
-  /**
-   * Provides bidirectional mapping between `path` and `queryParams` and a
-   * app-route compatible `route` object.
-   *
-   * For more information, see the docs for `app-route-converter`.
-   *
-   * @polymerBehavior
-   */
-  Polymer.AppRouteConverterBehavior = {
+Polymer({
+  is: 'iron-query-params',
+  properties: {
+    paramsString: {
+      type: String,
+      notify: true,
+      observer: 'paramsStringChanged'
+    },
+    paramsObject: {
+      type: Object,
+      notify: true,
+      value: function() {
+        return {};
+      }
+    },
+    _dontReact: {
+      type: Boolean,
+      value: false
+    }
+  },
+  hostAttributes: {
+    hidden: true
+  },
+  observers: [ 'paramsObjectChanged(paramsObject.*)' ],
+  paramsStringChanged: function() {
+    this._dontReact = true;
+    this.paramsObject = this._decodeParams(this.paramsString);
+    this._dontReact = false;
+  },
+  paramsObjectChanged: function() {
+    if (this._dontReact) {
+      return;
+    }
+    this.paramsString = this._encodeParams(this.paramsObject);
+  },
+  _encodeParams: function(params) {
+    var encodedParams = [];
+    for (var key in params) {
+      var value = params[key];
+      if (value === '') {
+        encodedParams.push(encodeURIComponent(key));
+      } else if (value) {
+        encodedParams.push(encodeURIComponent(key) + '=' + encodeURIComponent(value.toString()));
+      }
+    }
+    return encodedParams.join('&');
+  },
+  _decodeParams: function(paramString) {
+    var params = {};
+    paramString = (paramString || '').replace(/\+/g, '%20');
+    var paramList = paramString.split('&');
+    for (var i = 0; i < paramList.length; i++) {
+      var param = paramList[i].split('=');
+      if (param[0]) {
+        params[decodeURIComponent(param[0])] = decodeURIComponent(param[1] || '');
+      }
+    }
+    return params;
+  }
+});
+
+'use strict';
+
+Polymer.AppRouteConverterBehavior = {
+  properties: {
+    route: {
+      type: Object,
+      notify: true
+    },
+    queryParams: {
+      type: Object,
+      notify: true
+    },
+    path: {
+      type: String,
+      notify: true
+    }
+  },
+  observers: [ '_locationChanged(path, queryParams)', '_routeChanged(route.prefix, route.path)', '_routeQueryParamsChanged(route.__queryParams)' ],
+  created: function() {
+    this.linkPaths('route.__queryParams', 'queryParams');
+    this.linkPaths('queryParams', 'route.__queryParams');
+  },
+  _locationChanged: function() {
+    if (this.route && this.route.path === this.path && this.queryParams === this.route.__queryParams) {
+      return;
+    }
+    this.route = {
+      prefix: '',
+      path: this.path,
+      __queryParams: this.queryParams
+    };
+  },
+  _routeChanged: function() {
+    if (!this.route) {
+      return;
+    }
+    this.path = this.route.prefix + this.route.path;
+  },
+  _routeQueryParamsChanged: function(queryParams) {
+    if (!this.route) {
+      return;
+    }
+    this.queryParams = queryParams;
+  }
+};
+
+'use strict';
+
+Polymer({
+  is: 'app-location',
+  properties: {
+    route: {
+      type: Object,
+      notify: true
+    },
+    useHashAsPath: {
+      type: Boolean,
+      value: false
+    },
+    urlSpaceRegex: {
+      type: String,
+      notify: true
+    },
+    __queryParams: {
+      type: Object
+    },
+    __path: {
+      type: String
+    },
+    __query: {
+      type: String
+    },
+    __hash: {
+      type: String
+    },
+    path: {
+      type: String,
+      observer: '__onPathChanged'
+    }
+  },
+  behaviors: [ Polymer.AppRouteConverterBehavior ],
+  observers: [ '__computeRoutePath(useHashAsPath, __hash, __path)' ],
+  __computeRoutePath: function() {
+    this.path = this.useHashAsPath ? this.__hash : this.__path;
+  },
+  __onPathChanged: function() {
+    if (!this._readied) {
+      return;
+    }
+    if (this.useHashAsPath) {
+      this.__hash = this.path;
+    } else {
+      this.__path = this.path;
+    }
+  }
+});
+
+'use strict';
+
+Polymer({
+  is: 'app-route',
+  properties: {
+    route: {
+      type: Object,
+      notify: true
+    },
+    pattern: {
+      type: String
+    },
+    data: {
+      type: Object,
+      value: function() {
+        return {};
+      },
+      notify: true
+    },
+    queryParams: {
+      type: Object,
+      value: function() {
+        return {};
+      },
+      notify: true
+    },
+    tail: {
+      type: Object,
+      value: function() {
+        return {
+          path: null,
+          prefix: null,
+          __queryParams: null
+        };
+      },
+      notify: true
+    },
+    active: {
+      type: Boolean,
+      notify: true,
+      readOnly: true
+    },
+    _queryParamsUpdating: {
+      type: Boolean,
+      value: false
+    },
+    _matched: {
+      type: String,
+      value: ''
+    }
+  },
+  observers: [ '__tryToMatch(route.path, pattern)', '__updatePathOnDataChange(data.*)', '__tailPathChanged(tail.path)', '__routeQueryParamsChanged(route.__queryParams)', '__tailQueryParamsChanged(tail.__queryParams)', '__queryParamsChanged(queryParams.*)' ],
+  created: function() {
+    this.linkPaths('route.__queryParams', 'tail.__queryParams');
+    this.linkPaths('tail.__queryParams', 'route.__queryParams');
+  },
+  __routeQueryParamsChanged: function(queryParams) {
+    if (queryParams && this.tail) {
+      this.set('tail.__queryParams', queryParams);
+      if (!this.active || this._queryParamsUpdating) {
+        return;
+      }
+      var copyOfQueryParams = {};
+      var anythingChanged = false;
+      for (var key in queryParams) {
+        copyOfQueryParams[key] = queryParams[key];
+        if (anythingChanged || !this.queryParams || queryParams[key] !== this.queryParams[key]) {
+          anythingChanged = true;
+        }
+      }
+      for (var key in this.queryParams) {
+        if (anythingChanged || !(key in queryParams)) {
+          anythingChanged = true;
+          break;
+        }
+      }
+      if (!anythingChanged) {
+        return;
+      }
+      this._queryParamsUpdating = true;
+      this.set('queryParams', copyOfQueryParams);
+      this._queryParamsUpdating = false;
+    }
+  },
+  __tailQueryParamsChanged: function(queryParams) {
+    if (queryParams && this.route) {
+      this.set('route.__queryParams', queryParams);
+    }
+  },
+  __queryParamsChanged: function(changes) {
+    if (!this.active || this._queryParamsUpdating) {
+      return;
+    }
+    this.set('route.__' + changes.path, changes.value);
+  },
+  __resetProperties: function() {
+    this._setActive(false);
+    this._matched = null;
+  },
+  __tryToMatch: function() {
+    if (!this.route) {
+      return;
+    }
+    var path = this.route.path;
+    var pattern = this.pattern;
+    if (!pattern) {
+      return;
+    }
+    if (!path) {
+      this.__resetProperties();
+      return;
+    }
+    var remainingPieces = path.split('/');
+    var patternPieces = pattern.split('/');
+    var matched = [];
+    var namedMatches = {};
+    for (var i = 0; i < patternPieces.length; i++) {
+      var patternPiece = patternPieces[i];
+      if (!patternPiece && patternPiece !== '') {
+        break;
+      }
+      var pathPiece = remainingPieces.shift();
+      if (!pathPiece && pathPiece !== '') {
+        this.__resetProperties();
+        return;
+      }
+      matched.push(pathPiece);
+      if (patternPiece.charAt(0) == ':') {
+        namedMatches[patternPiece.slice(1)] = pathPiece;
+      } else if (patternPiece !== pathPiece) {
+        this.__resetProperties();
+        return;
+      }
+    }
+    this._matched = matched.join('/');
+    var propertyUpdates = {};
+    if (!this.active) {
+      propertyUpdates.active = true;
+    }
+    var tailPrefix = this.route.prefix + this._matched;
+    var tailPath = remainingPieces.join('/');
+    if (remainingPieces.length > 0) {
+      tailPath = '/' + tailPath;
+    }
+    if (!this.tail || this.tail.prefix !== tailPrefix || this.tail.path !== tailPath) {
+      propertyUpdates.tail = {
+        prefix: tailPrefix,
+        path: tailPath,
+        __queryParams: this.route.__queryParams
+      };
+    }
+    propertyUpdates.data = namedMatches;
+    this._dataInUrl = {};
+    for (var key in namedMatches) {
+      this._dataInUrl[key] = namedMatches[key];
+    }
+    this.__setMulti(propertyUpdates);
+  },
+  __tailPathChanged: function() {
+    if (!this.active) {
+      return;
+    }
+    var tailPath = this.tail.path;
+    var newPath = this._matched;
+    if (tailPath) {
+      if (tailPath.charAt(0) !== '/') {
+        tailPath = '/' + tailPath;
+      }
+      newPath += tailPath;
+    }
+    this.set('route.path', newPath);
+  },
+  __updatePathOnDataChange: function() {
+    if (!this.route || !this.active) {
+      return;
+    }
+    var newPath = this.__getLink({});
+    var oldPath = this.__getLink(this._dataInUrl);
+    if (newPath === oldPath) {
+      return;
+    }
+    this.set('route.path', newPath);
+  },
+  __getLink: function(overrideValues) {
+    var values = {
+      tail: null
+    };
+    for (var key in this.data) {
+      values[key] = this.data[key];
+    }
+    for (var key in overrideValues) {
+      values[key] = overrideValues[key];
+    }
+    var patternPieces = this.pattern.split('/');
+    var interp = patternPieces.map(function(value) {
+      if (value[0] == ':') {
+        value = values[value.slice(1)];
+      }
+      return value;
+    }, this);
+    if (values.tail && values.tail.path) {
+      if (interp.length > 0 && values.tail.path.charAt(0) === '/') {
+        interp.push(values.tail.path.slice(1));
+      } else {
+        interp.push(values.tail.path);
+      }
+    }
+    return interp.join('/');
+  },
+  __setMulti: function(setObj) {
+    for (var property in setObj) {
+      this._propertySetter(property, setObj[property]);
+    }
+    for (var property in setObj) {
+      this._pathEffector(property, this[property]);
+      this._notifyPathUp(property, this[property]);
+    }
+  }
+});
+
+Polymer({
+  is: 'iron-media-query',
+  properties: {
+    queryMatches: {
+      type: Boolean,
+      value: false,
+      readOnly: true,
+      notify: true
+    },
+    query: {
+      type: String,
+      observer: 'queryChanged'
+    },
+    full: {
+      type: Boolean,
+      value: false
+    },
+    _boundMQHandler: {
+      value: function() {
+        return this.queryHandler.bind(this);
+      }
+    },
+    _mq: {
+      value: null
+    }
+  },
+  attached: function() {
+    this.style.display = 'none';
+    this.queryChanged();
+  },
+  detached: function() {
+    this._remove();
+  },
+  _add: function() {
+    if (this._mq) {
+      this._mq.addListener(this._boundMQHandler);
+    }
+  },
+  _remove: function() {
+    if (this._mq) {
+      this._mq.removeListener(this._boundMQHandler);
+    }
+    this._mq = null;
+  },
+  queryChanged: function() {
+    this._remove();
+    var query = this.query;
+    if (!query) {
+      return;
+    }
+    if (!this.full && query[0] !== '(') {
+      query = '(' + query + ')';
+    }
+    this._mq = window.matchMedia(query);
+    this._add();
+    this.queryHandler(this._mq);
+  },
+  queryHandler: function(mq) {
+    this._setQueryMatches(mq.matches);
+  }
+});
+
+Polymer.IronResizableBehavior = {
+  properties: {
+    _parentResizable: {
+      type: Object,
+      observer: '_parentResizableChanged'
+    },
+    _notifyingDescendant: {
+      type: Boolean,
+      value: false
+    }
+  },
+  listeners: {
+    'iron-request-resize-notifications': '_onIronRequestResizeNotifications'
+  },
+  created: function() {
+    this._interestedResizables = [];
+    this._boundNotifyResize = this.notifyResize.bind(this);
+  },
+  attached: function() {
+    this.fire('iron-request-resize-notifications', null, {
+      node: this,
+      bubbles: true,
+      cancelable: true
+    });
+    if (!this._parentResizable) {
+      window.addEventListener('resize', this._boundNotifyResize);
+      this.notifyResize();
+    }
+  },
+  detached: function() {
+    if (this._parentResizable) {
+      this._parentResizable.stopResizeNotificationsFor(this);
+    } else {
+      window.removeEventListener('resize', this._boundNotifyResize);
+    }
+    this._parentResizable = null;
+  },
+  notifyResize: function() {
+    if (!this.isAttached) {
+      return;
+    }
+    this._interestedResizables.forEach(function(resizable) {
+      if (this.resizerShouldNotify(resizable)) {
+        this._notifyDescendant(resizable);
+      }
+    }, this);
+    this._fireResize();
+  },
+  assignParentResizable: function(parentResizable) {
+    this._parentResizable = parentResizable;
+  },
+  stopResizeNotificationsFor: function(target) {
+    var index = this._interestedResizables.indexOf(target);
+    if (index > -1) {
+      this._interestedResizables.splice(index, 1);
+      this.unlisten(target, 'iron-resize', '_onDescendantIronResize');
+    }
+  },
+  resizerShouldNotify: function(element) {
+    return true;
+  },
+  _onDescendantIronResize: function(event) {
+    if (this._notifyingDescendant) {
+      event.stopPropagation();
+      return;
+    }
+    if (!Polymer.Settings.useShadow) {
+      this._fireResize();
+    }
+  },
+  _fireResize: function() {
+    this.fire('iron-resize', null, {
+      node: this,
+      bubbles: false
+    });
+  },
+  _onIronRequestResizeNotifications: function(event) {
+    var target = event.path ? event.path[0] : event.target;
+    if (target === this) {
+      return;
+    }
+    if (this._interestedResizables.indexOf(target) === -1) {
+      this._interestedResizables.push(target);
+      this.listen(target, 'iron-resize', '_onDescendantIronResize');
+    }
+    target.assignParentResizable(this);
+    this._notifyDescendant(target);
+    event.stopPropagation();
+  },
+  _parentResizableChanged: function(parentResizable) {
+    if (parentResizable) {
+      window.removeEventListener('resize', this._boundNotifyResize);
+    }
+  },
+  _notifyDescendant: function(descendant) {
+    if (!this.isAttached) {
+      return;
+    }
+    this._notifyingDescendant = true;
+    descendant.notifyResize();
+    this._notifyingDescendant = false;
+  }
+};
+
+Polymer.IronSelection = function(selectCallback) {
+  this.selection = [];
+  this.selectCallback = selectCallback;
+};
+
+Polymer.IronSelection.prototype = {
+  get: function() {
+    return this.multi ? this.selection.slice() : this.selection[0];
+  },
+  clear: function(excludes) {
+    this.selection.slice().forEach(function(item) {
+      if (!excludes || excludes.indexOf(item) < 0) {
+        this.setItemSelected(item, false);
+      }
+    }, this);
+  },
+  isSelected: function(item) {
+    return this.selection.indexOf(item) >= 0;
+  },
+  setItemSelected: function(item, isSelected) {
+    if (item != null) {
+      if (isSelected !== this.isSelected(item)) {
+        if (isSelected) {
+          this.selection.push(item);
+        } else {
+          var i = this.selection.indexOf(item);
+          if (i >= 0) {
+            this.selection.splice(i, 1);
+          }
+        }
+        if (this.selectCallback) {
+          this.selectCallback(item, isSelected);
+        }
+      }
+    }
+  },
+  select: function(item) {
+    if (this.multi) {
+      this.toggle(item);
+    } else if (this.get() !== item) {
+      this.setItemSelected(this.get(), false);
+      this.setItemSelected(item, true);
+    }
+  },
+  toggle: function(item) {
+    this.setItemSelected(item, !this.isSelected(item));
+  }
+};
+
+Polymer.IronSelectableBehavior = {
+  properties: {
+    attrForSelected: {
+      type: String,
+      value: null
+    },
+    selected: {
+      type: String,
+      notify: true
+    },
+    selectedItem: {
+      type: Object,
+      readOnly: true,
+      notify: true
+    },
+    activateEvent: {
+      type: String,
+      value: 'tap',
+      observer: '_activateEventChanged'
+    },
+    selectable: String,
+    selectedClass: {
+      type: String,
+      value: 'iron-selected'
+    },
+    selectedAttribute: {
+      type: String,
+      value: null
+    },
+    fallbackSelection: {
+      type: String,
+      value: null
+    },
+    items: {
+      type: Array,
+      readOnly: true,
+      notify: true,
+      value: function() {
+        return [];
+      }
+    },
+    _excludedLocalNames: {
+      type: Object,
+      value: function() {
+        return {
+          template: 1
+        };
+      }
+    }
+  },
+  observers: [ '_updateAttrForSelected(attrForSelected)', '_updateSelected(selected)', '_checkFallback(fallbackSelection)' ],
+  created: function() {
+    this._bindFilterItem = this._filterItem.bind(this);
+    this._selection = new Polymer.IronSelection(this._applySelection.bind(this));
+  },
+  attached: function() {
+    this._observer = this._observeItems(this);
+    this._updateItems();
+    if (!this._shouldUpdateSelection) {
+      this._updateSelected();
+    }
+    this._addListener(this.activateEvent);
+  },
+  detached: function() {
+    if (this._observer) {
+      Polymer.dom(this).unobserveNodes(this._observer);
+    }
+    this._removeListener(this.activateEvent);
+  },
+  indexOf: function(item) {
+    return this.items.indexOf(item);
+  },
+  select: function(value) {
+    this.selected = value;
+  },
+  selectPrevious: function() {
+    var length = this.items.length;
+    var index = (Number(this._valueToIndex(this.selected)) - 1 + length) % length;
+    this.selected = this._indexToValue(index);
+  },
+  selectNext: function() {
+    var index = (Number(this._valueToIndex(this.selected)) + 1) % this.items.length;
+    this.selected = this._indexToValue(index);
+  },
+  selectIndex: function(index) {
+    this.select(this._indexToValue(index));
+  },
+  forceSynchronousItemUpdate: function() {
+    this._updateItems();
+  },
+  get _shouldUpdateSelection() {
+    return this.selected != null;
+  },
+  _checkFallback: function() {
+    if (this._shouldUpdateSelection) {
+      this._updateSelected();
+    }
+  },
+  _addListener: function(eventName) {
+    this.listen(this, eventName, '_activateHandler');
+  },
+  _removeListener: function(eventName) {
+    this.unlisten(this, eventName, '_activateHandler');
+  },
+  _activateEventChanged: function(eventName, old) {
+    this._removeListener(old);
+    this._addListener(eventName);
+  },
+  _updateItems: function() {
+    var nodes = Polymer.dom(this).queryDistributedElements(this.selectable || '*');
+    nodes = Array.prototype.filter.call(nodes, this._bindFilterItem);
+    this._setItems(nodes);
+  },
+  _updateAttrForSelected: function() {
+    if (this._shouldUpdateSelection) {
+      this.selected = this._indexToValue(this.indexOf(this.selectedItem));
+    }
+  },
+  _updateSelected: function() {
+    this._selectSelected(this.selected);
+  },
+  _selectSelected: function(selected) {
+    this._selection.select(this._valueToItem(this.selected));
+    if (this.fallbackSelection && this.items.length && this._selection.get() === undefined) {
+      this.selected = this.fallbackSelection;
+    }
+  },
+  _filterItem: function(node) {
+    return !this._excludedLocalNames[node.localName];
+  },
+  _valueToItem: function(value) {
+    return value == null ? null : this.items[this._valueToIndex(value)];
+  },
+  _valueToIndex: function(value) {
+    if (this.attrForSelected) {
+      for (var i = 0, item; item = this.items[i]; i++) {
+        if (this._valueForItem(item) == value) {
+          return i;
+        }
+      }
+    } else {
+      return Number(value);
+    }
+  },
+  _indexToValue: function(index) {
+    if (this.attrForSelected) {
+      var item = this.items[index];
+      if (item) {
+        return this._valueForItem(item);
+      }
+    } else {
+      return index;
+    }
+  },
+  _valueForItem: function(item) {
+    var propValue = item[Polymer.CaseMap.dashToCamelCase(this.attrForSelected)];
+    return propValue != undefined ? propValue : item.getAttribute(this.attrForSelected);
+  },
+  _applySelection: function(item, isSelected) {
+    if (this.selectedClass) {
+      this.toggleClass(this.selectedClass, isSelected, item);
+    }
+    if (this.selectedAttribute) {
+      this.toggleAttribute(this.selectedAttribute, isSelected, item);
+    }
+    this._selectionChange();
+    this.fire('iron-' + (isSelected ? 'select' : 'deselect'), {
+      item: item
+    });
+  },
+  _selectionChange: function() {
+    this._setSelectedItem(this._selection.get());
+  },
+  _observeItems: function(node) {
+    return Polymer.dom(node).observeNodes(function(mutation) {
+      this._updateItems();
+      if (this._shouldUpdateSelection) {
+        this._updateSelected();
+      }
+      this.fire('iron-items-changed', mutation, {
+        bubbles: false,
+        cancelable: false
+      });
+    });
+  },
+  _activateHandler: function(e) {
+    var t = e.target;
+    var items = this.items;
+    while (t && t != this) {
+      var i = items.indexOf(t);
+      if (i >= 0) {
+        var value = this._indexToValue(i);
+        this._itemActivate(value, t);
+        return;
+      }
+      t = t.parentNode;
+    }
+  },
+  _itemActivate: function(value, item) {
+    if (!this.fire('iron-activate', {
+      selected: value,
+      item: item
+    }, {
+      cancelable: true
+    }).defaultPrevented) {
+      this.select(value);
+    }
+  }
+};
+
+Polymer({
+  is: 'iron-pages',
+  behaviors: [ Polymer.IronResizableBehavior, Polymer.IronSelectableBehavior ],
+  properties: {
+    activateEvent: {
+      type: String,
+      value: null
+    }
+  },
+  observers: [ '_selectedPageChanged(selected)' ],
+  _selectedPageChanged: function(selected, old) {
+    this.async(this.notifyResize);
+  }
+});
+
+(function() {
+  'use strict';
+  var KEY_IDENTIFIER = {
+    'U+0008': 'backspace',
+    'U+0009': 'tab',
+    'U+001B': 'esc',
+    'U+0020': 'space',
+    'U+007F': 'del'
+  };
+  var KEY_CODE = {
+    8: 'backspace',
+    9: 'tab',
+    13: 'enter',
+    27: 'esc',
+    33: 'pageup',
+    34: 'pagedown',
+    35: 'end',
+    36: 'home',
+    32: 'space',
+    37: 'left',
+    38: 'up',
+    39: 'right',
+    40: 'down',
+    46: 'del',
+    106: '*'
+  };
+  var MODIFIER_KEYS = {
+    shift: 'shiftKey',
+    ctrl: 'ctrlKey',
+    alt: 'altKey',
+    meta: 'metaKey'
+  };
+  var KEY_CHAR = /[a-z0-9*]/;
+  var IDENT_CHAR = /U\+/;
+  var ARROW_KEY = /^arrow/;
+  var SPACE_KEY = /^space(bar)?/;
+  var ESC_KEY = /^escape$/;
+  function transformKey(key, noSpecialChars) {
+    var validKey = '';
+    if (key) {
+      var lKey = key.toLowerCase();
+      if (lKey === ' ' || SPACE_KEY.test(lKey)) {
+        validKey = 'space';
+      } else if (ESC_KEY.test(lKey)) {
+        validKey = 'esc';
+      } else if (lKey.length == 1) {
+        if (!noSpecialChars || KEY_CHAR.test(lKey)) {
+          validKey = lKey;
+        }
+      } else if (ARROW_KEY.test(lKey)) {
+        validKey = lKey.replace('arrow', '');
+      } else if (lKey == 'multiply') {
+        validKey = '*';
+      } else {
+        validKey = lKey;
+      }
+    }
+    return validKey;
+  }
+  function transformKeyIdentifier(keyIdent) {
+    var validKey = '';
+    if (keyIdent) {
+      if (keyIdent in KEY_IDENTIFIER) {
+        validKey = KEY_IDENTIFIER[keyIdent];
+      } else if (IDENT_CHAR.test(keyIdent)) {
+        keyIdent = parseInt(keyIdent.replace('U+', '0x'), 16);
+        validKey = String.fromCharCode(keyIdent).toLowerCase();
+      } else {
+        validKey = keyIdent.toLowerCase();
+      }
+    }
+    return validKey;
+  }
+  function transformKeyCode(keyCode) {
+    var validKey = '';
+    if (Number(keyCode)) {
+      if (keyCode >= 65 && keyCode <= 90) {
+        validKey = String.fromCharCode(32 + keyCode);
+      } else if (keyCode >= 112 && keyCode <= 123) {
+        validKey = 'f' + (keyCode - 112);
+      } else if (keyCode >= 48 && keyCode <= 57) {
+        validKey = String(keyCode - 48);
+      } else if (keyCode >= 96 && keyCode <= 105) {
+        validKey = String(keyCode - 96);
+      } else {
+        validKey = KEY_CODE[keyCode];
+      }
+    }
+    return validKey;
+  }
+  function normalizedKeyForEvent(keyEvent, noSpecialChars) {
+    return transformKey(keyEvent.key, noSpecialChars) || transformKeyIdentifier(keyEvent.keyIdentifier) || transformKeyCode(keyEvent.keyCode) || transformKey(keyEvent.detail ? keyEvent.detail.key : keyEvent.detail, noSpecialChars) || '';
+  }
+  function keyComboMatchesEvent(keyCombo, event) {
+    var keyEvent = normalizedKeyForEvent(event, keyCombo.hasModifiers);
+    return keyEvent === keyCombo.key && (!keyCombo.hasModifiers || !!event.shiftKey === !!keyCombo.shiftKey && !!event.ctrlKey === !!keyCombo.ctrlKey && !!event.altKey === !!keyCombo.altKey && !!event.metaKey === !!keyCombo.metaKey);
+  }
+  function parseKeyComboString(keyComboString) {
+    if (keyComboString.length === 1) {
+      return {
+        combo: keyComboString,
+        key: keyComboString,
+        event: 'keydown'
+      };
+    }
+    return keyComboString.split('+').reduce(function(parsedKeyCombo, keyComboPart) {
+      var eventParts = keyComboPart.split(':');
+      var keyName = eventParts[0];
+      var event = eventParts[1];
+      if (keyName in MODIFIER_KEYS) {
+        parsedKeyCombo[MODIFIER_KEYS[keyName]] = true;
+        parsedKeyCombo.hasModifiers = true;
+      } else {
+        parsedKeyCombo.key = keyName;
+        parsedKeyCombo.event = event || 'keydown';
+      }
+      return parsedKeyCombo;
+    }, {
+      combo: keyComboString.split(':').shift()
+    });
+  }
+  function parseEventString(eventString) {
+    return eventString.trim().split(' ').map(function(keyComboString) {
+      return parseKeyComboString(keyComboString);
+    });
+  }
+  Polymer.IronA11yKeysBehavior = {
     properties: {
-      /**
-       * A model representing the deserialized path through the route tree, as
-       * well as the current queryParams.
-       *
-       * A route object is the kernel of the routing system. It is intended to
-       * be fed into consuming elements such as `app-route`.
-       *
-       * @type {?Object}
-       */
-      route: {
+      keyEventTarget: {
         type: Object,
-        notify: true
-      },
-
-      /**
-       * A set of key/value pairs that are universally accessible to branches of
-       * the route tree.
-       *
-       * @type {?Object}
-       */
-      queryParams: {
-        type: Object,
-        notify: true
-      },
-
-      /**
-       * The serialized path through the route tree. This corresponds to the
-       * `window.location.pathname` value, and will update to reflect changes
-       * to that value.
-       */
-      path: {
-        type: String,
-        notify: true,
-      }
-    },
-
-    observers: [
-      '_locationChanged(path, queryParams)',
-      '_routeChanged(route.prefix, route.path)',
-      '_routeQueryParamsChanged(route.__queryParams)'
-    ],
-
-    created: function() {
-      this.linkPaths('route.__queryParams', 'queryParams');
-      this.linkPaths('queryParams', 'route.__queryParams');
-    },
-
-    /**
-     * Handler called when the path or queryParams change.
-     */
-    _locationChanged: function() {
-      if (this.route &&
-          this.route.path === this.path &&
-          this.queryParams === this.route.__queryParams) {
-        return;
-      }
-      this.route = {
-        prefix: '',
-        path: this.path,
-        __queryParams: this.queryParams
-      };
-    },
-
-    /**
-     * Handler called when the route prefix and route path change.
-     */
-    _routeChanged: function() {
-      if (!this.route) {
-        return;
-      }
-
-      this.path = this.route.prefix + this.route.path;
-    },
-
-    /**
-     * Handler called when the route queryParams change.
-     *
-     * @param  {Object} queryParams A set of key/value pairs that are
-     * universally accessible to branches of the route tree.
-     */
-    _routeQueryParamsChanged: function(queryParams) {
-      if (!this.route) {
-        return;
-      }
-      this.queryParams = queryParams;
-    }
-  };
-'use strict';
-
-    Polymer({
-      is: 'app-location',
-
-      properties: {
-        /**
-         * A model representing the deserialized path through the route tree, as
-         * well as the current queryParams.
-         */
-        route: {
-          type: Object,
-          notify: true
-        },
-
-        /**
-         * In many scenarios, it is convenient to treat the `hash` as a stand-in
-         * alternative to the `path`. For example, if deploying an app to a static
-         * web server (e.g., Github Pages) - where one does not have control over
-         * server-side routing - it is usually a better experience to use the hash
-         * to represent paths through one's app.
-         *
-         * When this property is set to true, the `hash` will be used in place of
-
-         * the `path` for generating a `route`.
-         */
-        useHashAsPath: {
-          type: Boolean,
-          value: false
-        },
-
-        /**
-         * A regexp that defines the set of URLs that should be considered part
-         * of this web app.
-         *
-         * Clicking on a link that matches this regex won't result in a full page
-         * navigation, but will instead just update the URL state in place.
-         *
-         * This regexp is given everything after the origin in an absolute
-         * URL. So to match just URLs that start with /search/ do:
-         *     url-space-regex="^/search/"
-         *
-         * @type {string|RegExp}
-         */
-        urlSpaceRegex: {
-          type: String,
-          notify: true
-        },
-
-        /**
-         * A set of key/value pairs that are universally accessible to branches
-         * of the route tree.
-         */
-        __queryParams: {
-          type: Object
-        },
-
-        /**
-         * The pathname component of the current URL.
-         */
-        __path: {
-          type: String
-        },
-
-        /**
-         * The query string portion of the current URL.
-         */
-        __query: {
-          type: String
-        },
-
-        /**
-         * The hash portion of the current URL.
-         */
-        __hash: {
-          type: String
-        },
-
-        /**
-         * The route path, which will be either the hash or the path, depending
-         * on useHashAsPath.
-         */
-        path: {
-          type: String,
-          observer: '__onPathChanged'
+        value: function() {
+          return this;
         }
       },
-
-      behaviors: [Polymer.AppRouteConverterBehavior],
-
-      observers: [
-        '__computeRoutePath(useHashAsPath, __hash, __path)'
-      ],
-
-      __computeRoutePath: function() {
-        this.path = this.useHashAsPath ? this.__hash : this.__path;
-      },
-
-      __onPathChanged: function() {
-        if (!this._readied) {
-          return;
-        }
-
-        if (this.useHashAsPath) {
-          this.__hash = this.path;
-        } else {
-          this.__path = this.path;
-        }
-      }
-    });
-'use strict';
-
-  Polymer({
-    is: 'app-route',
-
-    properties: {
-      /**
-       * The URL component managed by this element.
-       */
-      route: {
-        type: Object,
-        notify: true
-      },
-
-      /**
-       * The pattern of slash-separated segments to match `path` against.
-       *
-       * For example the pattern "/foo" will match "/foo" or "/foo/bar"
-       * but not "/foobar".
-       *
-       * Path segments like `/:named` are mapped to properties on the `data` object.
-       */
-      pattern: {
-        type: String
-      },
-
-      /**
-       * The parameterized values that are extracted from the route as
-       * described by `pattern`.
-       */
-      data: {
-        type: Object,
-        value: function() {return {};},
-        notify: true
-      },
-
-      /**
-       * @type {?Object}
-       */
-      queryParams: {
-        type: Object,
-        value: function() {
-          return {};
-        },
-        notify: true
-      },
-
-      /**
-       * The part of `path` NOT consumed by `pattern`.
-       */
-      tail: {
-        type: Object,
-        value: function() {return {path: null, prefix: null, __queryParams: null};},
-        notify: true
-      },
-
-      active: {
-        type: Boolean,
-        notify: true,
-        readOnly: true
-      },
-
-      _queryParamsUpdating: {
+      stopKeyboardEventPropagation: {
         type: Boolean,
         value: false
       },
-      /**
-       * @type {?string}
-       */
-      _matched: {
-        type: String,
-        value: ''
-      }
-    },
-
-    observers: [
-      '__tryToMatch(route.path, pattern)',
-      '__updatePathOnDataChange(data.*)',
-      '__tailPathChanged(tail.path)',
-      '__routeQueryParamsChanged(route.__queryParams)',
-      '__tailQueryParamsChanged(tail.__queryParams)',
-      '__queryParamsChanged(queryParams.*)'
-    ],
-
-    created: function() {
-      this.linkPaths('route.__queryParams', 'tail.__queryParams');
-      this.linkPaths('tail.__queryParams', 'route.__queryParams');
-    },
-
-    /**
-     * Deal with the query params object being assigned to wholesale.
-     * @export
-     */
-    __routeQueryParamsChanged: function(queryParams) {
-      if (queryParams && this.tail) {
-        this.set('tail.__queryParams', queryParams);
-
-        if (!this.active || this._queryParamsUpdating) {
-          return;
-        }
-
-        // Copy queryParams and track whether there are any differences compared
-        // to the existing query params.
-        var copyOfQueryParams = {};
-        var anythingChanged = false;
-        for (var key in queryParams) {
-          copyOfQueryParams[key] = queryParams[key];
-          if (anythingChanged ||
-              !this.queryParams ||
-              queryParams[key] !== this.queryParams[key]) {
-            anythingChanged = true;
-          }
-        }
-        // Need to check whether any keys were deleted
-        for (var key in this.queryParams) {
-          if (anythingChanged || !(key in queryParams)) {
-            anythingChanged = true;
-            break;
-          }
-        }
-
-        if (!anythingChanged) {
-          return;
-        }
-        this._queryParamsUpdating = true;
-        this.set('queryParams', copyOfQueryParams);
-        this._queryParamsUpdating = false;
-      }
-    },
-
-    /**
-     * @export
-     */
-    __tailQueryParamsChanged: function(queryParams) {
-      if (queryParams && this.route) {
-        this.set('route.__queryParams', queryParams);
-      }
-    },
-
-    /**
-     * @export
-     */
-    __queryParamsChanged: function(changes) {
-      if (!this.active || this._queryParamsUpdating) {
-        return;
-      }
-
-      this.set('route.__' + changes.path, changes.value);
-    },
-
-    __resetProperties: function() {
-      this._setActive(false);
-      this._matched = null;
-      //this.tail = { path: null, prefix: null, queryParams: null };
-      //this.data = {};
-    },
-
-    /**
-     * @export
-     */
-    __tryToMatch: function() {
-      if (!this.route) {
-        return;
-      }
-      var path = this.route.path;
-      var pattern = this.pattern;
-      if (!pattern) {
-        return;
-      }
-
-      if (!path) {
-        this.__resetProperties();
-        return;
-      }
-
-      var remainingPieces = path.split('/');
-      var patternPieces = pattern.split('/');
-
-      var matched = [];
-      var namedMatches = {};
-
-      for (var i=0; i < patternPieces.length; i++) {
-        var patternPiece = patternPieces[i];
-        if (!patternPiece && patternPiece !== '') {
-          break;
-        }
-        var pathPiece = remainingPieces.shift();
-
-        // We don't match this path.
-        if (!pathPiece && pathPiece !== '') {
-          this.__resetProperties();
-          return;
-        }
-        matched.push(pathPiece);
-
-        if (patternPiece.charAt(0) == ':') {
-          namedMatches[patternPiece.slice(1)] = pathPiece;
-        } else if (patternPiece !== pathPiece) {
-          this.__resetProperties();
-          return;
-        }
-      }
-
-      this._matched = matched.join('/');
-
-      // Properties that must be updated atomically.
-      var propertyUpdates = {};
-
-      //this.active
-      if (!this.active) {
-        propertyUpdates.active = true;
-      }
-
-      // this.tail
-      var tailPrefix = this.route.prefix + this._matched;
-      var tailPath = remainingPieces.join('/');
-      if (remainingPieces.length > 0) {
-        tailPath = '/' + tailPath;
-      }
-      if (!this.tail ||
-          this.tail.prefix !== tailPrefix ||
-          this.tail.path !== tailPath) {
-        propertyUpdates.tail = {
-          prefix: tailPrefix,
-          path: tailPath,
-          __queryParams: this.route.__queryParams
-        };
-      }
-
-      // this.data
-      propertyUpdates.data = namedMatches;
-      this._dataInUrl = {};
-      for (var key in namedMatches) {
-        this._dataInUrl[key] = namedMatches[key];
-      }
-
-      this.__setMulti(propertyUpdates);
-    },
-
-    /**
-     * @export
-     */
-    __tailPathChanged: function() {
-      if (!this.active) {
-        return;
-      }
-      var tailPath = this.tail.path;
-      var newPath = this._matched;
-      if (tailPath) {
-        if (tailPath.charAt(0) !== '/') {
-          tailPath = '/' + tailPath;
-        }
-        newPath += tailPath;
-      }
-      this.set('route.path', newPath);
-    },
-
-    /**
-     * @export
-     */
-    __updatePathOnDataChange: function() {
-      if (!this.route || !this.active) {
-        return;
-      }
-      var newPath = this.__getLink({});
-      var oldPath = this.__getLink(this._dataInUrl);
-      if (newPath === oldPath) {
-        return;
-      }
-      this.set('route.path', newPath);
-    },
-
-    __getLink: function(overrideValues) {
-      var values = {tail: null};
-      for (var key in this.data) {
-        values[key] = this.data[key];
-      }
-      for (var key in overrideValues) {
-        values[key] = overrideValues[key];
-      }
-      var patternPieces = this.pattern.split('/');
-      var interp = patternPieces.map(function(value) {
-        if (value[0] == ':') {
-          value = values[value.slice(1)];
-        }
-        return value;
-      }, this);
-      if (values.tail && values.tail.path) {
-        if (interp.length > 0 && values.tail.path.charAt(0) === '/') {
-          interp.push(values.tail.path.slice(1));
-        } else {
-          interp.push(values.tail.path);
-        }
-      }
-      return interp.join('/');
-    },
-
-    __setMulti: function(setObj) {
-      // HACK(rictic): skirting around 1.0's lack of a setMulti by poking at
-      //     internal data structures. I would not advise that you copy this
-      //     example.
-      //
-      //     In the future this will be a feature of Polymer itself.
-      //     See: https://github.com/Polymer/polymer/issues/3640
-      //
-      //     Hacking around with private methods like this is juggling footguns,
-      //     and is likely to have unexpected and unsupported rough edges.
-      //
-      //     Be ye so warned.
-      for (var property in setObj) {
-        this._propertySetter(property, setObj[property]);
-      }
-
-      for (var property in setObj) {
-        this._pathEffector(property, this[property]);
-        this._notifyPathUp(property, this[property]);
-      }
-    }
-  });
-Polymer({
-
-    is: 'iron-media-query',
-
-    properties: {
-
-      /**
-       * The Boolean return value of the media query.
-       */
-      queryMatches: {
-        type: Boolean,
-        value: false,
-        readOnly: true,
-        notify: true
-      },
-
-      /**
-       * The CSS media query to evaluate.
-       */
-      query: {
-        type: String,
-        observer: 'queryChanged'
-      },
-
-      /**
-       * If true, the query attribute is assumed to be a complete media query
-       * string rather than a single media feature.
-       */
-      full: {
-        type: Boolean,
-        value: false
-      },
-
-      /**
-       * @type {function(MediaQueryList)}
-       */
-      _boundMQHandler: {
-        value: function() {
-          return this.queryHandler.bind(this);
-        }
-      },
-
-      /**
-       * @type {MediaQueryList}
-       */
-      _mq: {
-        value: null
-      }
-    },
-
-    attached: function() {
-      this.style.display = 'none';
-      this.queryChanged();
-    },
-
-    detached: function() {
-      this._remove();
-    },
-
-    _add: function() {
-      if (this._mq) {
-        this._mq.addListener(this._boundMQHandler);
-      }
-    },
-
-    _remove: function() {
-      if (this._mq) {
-        this._mq.removeListener(this._boundMQHandler);
-      }
-      this._mq = null;
-    },
-
-    queryChanged: function() {
-      this._remove();
-      var query = this.query;
-      if (!query) {
-        return;
-      }
-      if (!this.full && query[0] !== '(') {
-        query = '(' + query + ')';
-      }
-      this._mq = window.matchMedia(query);
-      this._add();
-      this.queryHandler(this._mq);
-    },
-
-    queryHandler: function(mq) {
-      this._setQueryMatches(mq.matches);
-    }
-
-  });
-/**
-   * `IronResizableBehavior` is a behavior that can be used in Polymer elements to
-   * coordinate the flow of resize events between "resizers" (elements that control the
-   * size or hidden state of their children) and "resizables" (elements that need to be
-   * notified when they are resized or un-hidden by their parents in order to take
-   * action on their new measurements).
-   *
-   * Elements that perform measurement should add the `IronResizableBehavior` behavior to
-   * their element definition and listen for the `iron-resize` event on themselves.
-   * This event will be fired when they become showing after having been hidden,
-   * when they are resized explicitly by another resizable, or when the window has been
-   * resized.
-   *
-   * Note, the `iron-resize` event is non-bubbling.
-   *
-   * @polymerBehavior Polymer.IronResizableBehavior
-   * @demo demo/index.html
-   **/
-  Polymer.IronResizableBehavior = {
-    properties: {
-      /**
-       * The closest ancestor element that implements `IronResizableBehavior`.
-       */
-      _parentResizable: {
-        type: Object,
-        observer: '_parentResizableChanged'
-      },
-
-      /**
-       * True if this element is currently notifying its descedant elements of
-       * resize.
-       */
-      _notifyingDescendant: {
-        type: Boolean,
-        value: false
-      }
-    },
-
-    listeners: {
-      'iron-request-resize-notifications': '_onIronRequestResizeNotifications'
-    },
-
-    created: function() {
-      // We don't really need property effects on these, and also we want them
-      // to be created before the `_parentResizable` observer fires:
-      this._interestedResizables = [];
-      this._boundNotifyResize = this.notifyResize.bind(this);
-    },
-
-    attached: function() {
-      this.fire('iron-request-resize-notifications', null, {
-        node: this,
-        bubbles: true,
-        cancelable: true
-      });
-
-      if (!this._parentResizable) {
-        window.addEventListener('resize', this._boundNotifyResize);
-        this.notifyResize();
-      }
-    },
-
-    detached: function() {
-      if (this._parentResizable) {
-        this._parentResizable.stopResizeNotificationsFor(this);
-      } else {
-        window.removeEventListener('resize', this._boundNotifyResize);
-      }
-
-      this._parentResizable = null;
-    },
-
-    /**
-     * Can be called to manually notify a resizable and its descendant
-     * resizables of a resize change.
-     */
-    notifyResize: function() {
-      if (!this.isAttached) {
-        return;
-      }
-
-      this._interestedResizables.forEach(function(resizable) {
-        if (this.resizerShouldNotify(resizable)) {
-          this._notifyDescendant(resizable);
-        }
-      }, this);
-
-      this._fireResize();
-    },
-
-    /**
-     * Used to assign the closest resizable ancestor to this resizable
-     * if the ancestor detects a request for notifications.
-     */
-    assignParentResizable: function(parentResizable) {
-      this._parentResizable = parentResizable;
-    },
-
-    /**
-     * Used to remove a resizable descendant from the list of descendants
-     * that should be notified of a resize change.
-     */
-    stopResizeNotificationsFor: function(target) {
-      var index = this._interestedResizables.indexOf(target);
-
-      if (index > -1) {
-        this._interestedResizables.splice(index, 1);
-        this.unlisten(target, 'iron-resize', '_onDescendantIronResize');
-      }
-    },
-
-    /**
-     * This method can be overridden to filter nested elements that should or
-     * should not be notified by the current element. Return true if an element
-     * should be notified, or false if it should not be notified.
-     *
-     * @param {HTMLElement} element A candidate descendant element that
-     * implements `IronResizableBehavior`.
-     * @return {boolean} True if the `element` should be notified of resize.
-     */
-    resizerShouldNotify: function(element) { return true; },
-
-    _onDescendantIronResize: function(event) {
-      if (this._notifyingDescendant) {
-        event.stopPropagation();
-        return;
-      }
-
-      // NOTE(cdata): In ShadowDOM, event retargetting makes echoing of the
-      // otherwise non-bubbling event "just work." We do it manually here for
-      // the case where Polymer is not using shadow roots for whatever reason:
-      if (!Polymer.Settings.useShadow) {
-        this._fireResize();
-      }
-    },
-
-    _fireResize: function() {
-      this.fire('iron-resize', null, {
-        node: this,
-        bubbles: false
-      });
-    },
-
-    _onIronRequestResizeNotifications: function(event) {
-      var target = event.path ? event.path[0] : event.target;
-
-      if (target === this) {
-        return;
-      }
-
-      if (this._interestedResizables.indexOf(target) === -1) {
-        this._interestedResizables.push(target);
-        this.listen(target, 'iron-resize', '_onDescendantIronResize');
-      }
-
-      target.assignParentResizable(this);
-      this._notifyDescendant(target);
-
-      event.stopPropagation();
-    },
-
-    _parentResizableChanged: function(parentResizable) {
-      if (parentResizable) {
-        window.removeEventListener('resize', this._boundNotifyResize);
-      }
-    },
-
-    _notifyDescendant: function(descendant) {
-      // NOTE(cdata): In IE10, attached is fired on children first, so it's
-      // important not to notify them if the parent is not attached yet (or
-      // else they will get redundantly notified when the parent attaches).
-      if (!this.isAttached) {
-        return;
-      }
-
-      this._notifyingDescendant = true;
-      descendant.notifyResize();
-      this._notifyingDescendant = false;
-    }
-  };
-/**
-   * @param {!Function} selectCallback
-   * @constructor
-   */
-  Polymer.IronSelection = function(selectCallback) {
-    this.selection = [];
-    this.selectCallback = selectCallback;
-  };
-
-  Polymer.IronSelection.prototype = {
-
-    /**
-     * Retrieves the selected item(s).
-     *
-     * @method get
-     * @returns Returns the selected item(s). If the multi property is true,
-     * `get` will return an array, otherwise it will return
-     * the selected item or undefined if there is no selection.
-     */
-    get: function() {
-      return this.multi ? this.selection.slice() : this.selection[0];
-    },
-
-    /**
-     * Clears all the selection except the ones indicated.
-     *
-     * @method clear
-     * @param {Array} excludes items to be excluded.
-     */
-    clear: function(excludes) {
-      this.selection.slice().forEach(function(item) {
-        if (!excludes || excludes.indexOf(item) < 0) {
-          this.setItemSelected(item, false);
-        }
-      }, this);
-    },
-
-    /**
-     * Indicates if a given item is selected.
-     *
-     * @method isSelected
-     * @param {*} item The item whose selection state should be checked.
-     * @returns Returns true if `item` is selected.
-     */
-    isSelected: function(item) {
-      return this.selection.indexOf(item) >= 0;
-    },
-
-    /**
-     * Sets the selection state for a given item to either selected or deselected.
-     *
-     * @method setItemSelected
-     * @param {*} item The item to select.
-     * @param {boolean} isSelected True for selected, false for deselected.
-     */
-    setItemSelected: function(item, isSelected) {
-      if (item != null) {
-        if (isSelected !== this.isSelected(item)) {
-          // proceed to update selection only if requested state differs from current
-          if (isSelected) {
-            this.selection.push(item);
-          } else {
-            var i = this.selection.indexOf(item);
-            if (i >= 0) {
-              this.selection.splice(i, 1);
-            }
-          }
-          if (this.selectCallback) {
-            this.selectCallback(item, isSelected);
-          }
-        }
-      }
-    },
-
-    /**
-     * Sets the selection state for a given item. If the `multi` property
-     * is true, then the selected state of `item` will be toggled; otherwise
-     * the `item` will be selected.
-     *
-     * @method select
-     * @param {*} item The item to select.
-     */
-    select: function(item) {
-      if (this.multi) {
-        this.toggle(item);
-      } else if (this.get() !== item) {
-        this.setItemSelected(this.get(), false);
-        this.setItemSelected(item, true);
-      }
-    },
-
-    /**
-     * Toggles the selection state for `item`.
-     *
-     * @method toggle
-     * @param {*} item The item to toggle.
-     */
-    toggle: function(item) {
-      this.setItemSelected(item, !this.isSelected(item));
-    }
-
-  };
-/** @polymerBehavior */
-  Polymer.IronSelectableBehavior = {
-
-      /**
-       * Fired when iron-selector is activated (selected or deselected).
-       * It is fired before the selected items are changed.
-       * Cancel the event to abort selection.
-       *
-       * @event iron-activate
-       */
-
-      /**
-       * Fired when an item is selected
-       *
-       * @event iron-select
-       */
-
-      /**
-       * Fired when an item is deselected
-       *
-       * @event iron-deselect
-       */
-
-      /**
-       * Fired when the list of selectable items changes (e.g., items are
-       * added or removed). The detail of the event is a mutation record that
-       * describes what changed.
-       *
-       * @event iron-items-changed
-       */
-
-    properties: {
-
-      /**
-       * If you want to use an attribute value or property of an element for
-       * `selected` instead of the index, set this to the name of the attribute
-       * or property. Hyphenated values are converted to camel case when used to
-       * look up the property of a selectable element. Camel cased values are
-       * *not* converted to hyphenated values for attribute lookup. It's
-       * recommended that you provide the hyphenated form of the name so that
-       * selection works in both cases. (Use `attr-or-property-name` instead of
-       * `attrOrPropertyName`.)
-       */
-      attrForSelected: {
-        type: String,
-        value: null
-      },
-
-      /**
-       * Gets or sets the selected element. The default is to use the index of the item.
-       * @type {string|number}
-       */
-      selected: {
-        type: String,
-        notify: true
-      },
-
-      /**
-       * Returns the currently selected item.
-       *
-       * @type {?Object}
-       */
-      selectedItem: {
-        type: Object,
-        readOnly: true,
-        notify: true
-      },
-
-      /**
-       * The event that fires from items when they are selected. Selectable
-       * will listen for this event from items and update the selection state.
-       * Set to empty string to listen to no events.
-       */
-      activateEvent: {
-        type: String,
-        value: 'tap',
-        observer: '_activateEventChanged'
-      },
-
-      /**
-       * This is a CSS selector string.  If this is set, only items that match the CSS selector
-       * are selectable.
-       */
-      selectable: String,
-
-      /**
-       * The class to set on elements when selected.
-       */
-      selectedClass: {
-        type: String,
-        value: 'iron-selected'
-      },
-
-      /**
-       * The attribute to set on elements when selected.
-       */
-      selectedAttribute: {
-        type: String,
-        value: null
-      },
-
-      /**
-       * Default fallback if the selection based on selected with `attrForSelected`
-       * is not found.
-       */
-      fallbackSelection: {
-        type: String,
-        value: null
-      },
-
-      /**
-       * The list of items from which a selection can be made.
-       */
-      items: {
+      _boundKeyHandlers: {
         type: Array,
-        readOnly: true,
-        notify: true,
         value: function() {
           return [];
         }
       },
-
-      /**
-       * The set of excluded elements where the key is the `localName`
-       * of the element that will be ignored from the item list.
-       *
-       * @default {template: 1}
-       */
-      _excludedLocalNames: {
+      _imperativeKeyBindings: {
         type: Object,
         value: function() {
-          return {
-            'template': 1
-          };
+          return {};
         }
       }
     },
-
-    observers: [
-      '_updateAttrForSelected(attrForSelected)',
-      '_updateSelected(selected)',
-      '_checkFallback(fallbackSelection)'
-    ],
-
-    created: function() {
-      this._bindFilterItem = this._filterItem.bind(this);
-      this._selection = new Polymer.IronSelection(this._applySelection.bind(this));
-    },
-
+    observers: [ '_resetKeyEventListeners(keyEventTarget, _boundKeyHandlers)' ],
+    keyBindings: {},
+    registered: function() {
+      this._prepKeyBindings();
+    },
     attached: function() {
-      this._observer = this._observeItems(this);
-      this._updateItems();
-      if (!this._shouldUpdateSelection) {
-        this._updateSelected();
-      }
-      this._addListener(this.activateEvent);
-    },
-
+      this._listenKeyEventListeners();
+    },
     detached: function() {
-      if (this._observer) {
-        Polymer.dom(this).unobserveNodes(this._observer);
-      }
-      this._removeListener(this.activateEvent);
-    },
-
-    /**
-     * Returns the index of the given item.
-     *
-     * @method indexOf
-     * @param {Object} item
-     * @returns Returns the index of the item
-     */
-    indexOf: function(item) {
-      return this.items.indexOf(item);
-    },
-
-    /**
-     * Selects the given value.
-     *
-     * @method select
-     * @param {string|number} value the value to select.
-     */
-    select: function(value) {
-      this.selected = value;
-    },
-
-    /**
-     * Selects the previous item.
-     *
-     * @method selectPrevious
-     */
-    selectPrevious: function() {
-      var length = this.items.length;
-      var index = (Number(this._valueToIndex(this.selected)) - 1 + length) % length;
-      this.selected = this._indexToValue(index);
-    },
-
-    /**
-     * Selects the next item.
-     *
-     * @method selectNext
-     */
-    selectNext: function() {
-      var index = (Number(this._valueToIndex(this.selected)) + 1) % this.items.length;
-      this.selected = this._indexToValue(index);
-    },
-
-    /**
-     * Selects the item at the given index.
-     *
-     * @method selectIndex
-     */
-    selectIndex: function(index) {
-      this.select(this._indexToValue(index));
-    },
-
-    /**
-     * Force a synchronous update of the `items` property.
-     *
-     * NOTE: Consider listening for the `iron-items-changed` event to respond to
-     * updates to the set of selectable items after updates to the DOM list and
-     * selection state have been made.
-     *
-     * WARNING: If you are using this method, you should probably consider an
-     * alternate approach. Synchronously querying for items is potentially
-     * slow for many use cases. The `items` property will update asynchronously
-     * on its own to reflect selectable items in the DOM.
-     */
-    forceSynchronousItemUpdate: function() {
-      this._updateItems();
-    },
-
-    get _shouldUpdateSelection() {
-      return this.selected != null;
-    },
-
-    _checkFallback: function() {
-      if (this._shouldUpdateSelection) {
-        this._updateSelected();
-      }
-    },
-
-    _addListener: function(eventName) {
-      this.listen(this, eventName, '_activateHandler');
-    },
-
-    _removeListener: function(eventName) {
-      this.unlisten(this, eventName, '_activateHandler');
-    },
-
-    _activateEventChanged: function(eventName, old) {
-      this._removeListener(old);
-      this._addListener(eventName);
-    },
-
-    _updateItems: function() {
-      var nodes = Polymer.dom(this).queryDistributedElements(this.selectable || '*');
-      nodes = Array.prototype.filter.call(nodes, this._bindFilterItem);
-      this._setItems(nodes);
-    },
-
-    _updateAttrForSelected: function() {
-      if (this._shouldUpdateSelection) {
-        this.selected = this._indexToValue(this.indexOf(this.selectedItem));
-      }
-    },
-
-    _updateSelected: function() {
-      this._selectSelected(this.selected);
-    },
-
-    _selectSelected: function(selected) {
-      this._selection.select(this._valueToItem(this.selected));
-      // Check for items, since this array is populated only when attached
-      // Since Number(0) is falsy, explicitly check for undefined
-      if (this.fallbackSelection && this.items.length && (this._selection.get() === undefined)) {
-        this.selected = this.fallbackSelection;
-      }
-    },
-
-    _filterItem: function(node) {
-      return !this._excludedLocalNames[node.localName];
-    },
-
-    _valueToItem: function(value) {
-      return (value == null) ? null : this.items[this._valueToIndex(value)];
-    },
-
-    _valueToIndex: function(value) {
-      if (this.attrForSelected) {
-        for (var i = 0, item; item = this.items[i]; i++) {
-          if (this._valueForItem(item) == value) {
-            return i;
+      this._unlistenKeyEventListeners();
+    },
+    addOwnKeyBinding: function(eventString, handlerName) {
+      this._imperativeKeyBindings[eventString] = handlerName;
+      this._prepKeyBindings();
+      this._resetKeyEventListeners();
+    },
+    removeOwnKeyBindings: function() {
+      this._imperativeKeyBindings = {};
+      this._prepKeyBindings();
+      this._resetKeyEventListeners();
+    },
+    keyboardEventMatchesKeys: function(event, eventString) {
+      var keyCombos = parseEventString(eventString);
+      for (var i = 0; i < keyCombos.length; ++i) {
+        if (keyComboMatchesEvent(keyCombos[i], event)) {
+          return true;
+        }
+      }
+      return false;
+    },
+    _collectKeyBindings: function() {
+      var keyBindings = this.behaviors.map(function(behavior) {
+        return behavior.keyBindings;
+      });
+      if (keyBindings.indexOf(this.keyBindings) === -1) {
+        keyBindings.push(this.keyBindings);
+      }
+      return keyBindings;
+    },
+    _prepKeyBindings: function() {
+      this._keyBindings = {};
+      this._collectKeyBindings().forEach(function(keyBindings) {
+        for (var eventString in keyBindings) {
+          this._addKeyBinding(eventString, keyBindings[eventString]);
+        }
+      }, this);
+      for (var eventString in this._imperativeKeyBindings) {
+        this._addKeyBinding(eventString, this._imperativeKeyBindings[eventString]);
+      }
+      for (var eventName in this._keyBindings) {
+        this._keyBindings[eventName].sort(function(kb1, kb2) {
+          var b1 = kb1[0].hasModifiers;
+          var b2 = kb2[0].hasModifiers;
+          return b1 === b2 ? 0 : b1 ? -1 : 1;
+        });
+      }
+    },
+    _addKeyBinding: function(eventString, handlerName) {
+      parseEventString(eventString).forEach(function(keyCombo) {
+        this._keyBindings[keyCombo.event] = this._keyBindings[keyCombo.event] || [];
+        this._keyBindings[keyCombo.event].push([ keyCombo, handlerName ]);
+      }, this);
+    },
+    _resetKeyEventListeners: function() {
+      this._unlistenKeyEventListeners();
+      if (this.isAttached) {
+        this._listenKeyEventListeners();
+      }
+    },
+    _listenKeyEventListeners: function() {
+      if (!this.keyEventTarget) {
+        return;
+      }
+      Object.keys(this._keyBindings).forEach(function(eventName) {
+        var keyBindings = this._keyBindings[eventName];
+        var boundKeyHandler = this._onKeyBindingEvent.bind(this, keyBindings);
+        this._boundKeyHandlers.push([ this.keyEventTarget, eventName, boundKeyHandler ]);
+        this.keyEventTarget.addEventListener(eventName, boundKeyHandler);
+      }, this);
+    },
+    _unlistenKeyEventListeners: function() {
+      var keyHandlerTuple;
+      var keyEventTarget;
+      var eventName;
+      var boundKeyHandler;
+      while (this._boundKeyHandlers.length) {
+        keyHandlerTuple = this._boundKeyHandlers.pop();
+        keyEventTarget = keyHandlerTuple[0];
+        eventName = keyHandlerTuple[1];
+        boundKeyHandler = keyHandlerTuple[2];
+        keyEventTarget.removeEventListener(eventName, boundKeyHandler);
+      }
+    },
+    _onKeyBindingEvent: function(keyBindings, event) {
+      if (this.stopKeyboardEventPropagation) {
+        event.stopPropagation();
+      }
+      if (event.defaultPrevented) {
+        return;
+      }
+      for (var i = 0; i < keyBindings.length; i++) {
+        var keyCombo = keyBindings[i][0];
+        var handlerName = keyBindings[i][1];
+        if (keyComboMatchesEvent(keyCombo, event)) {
+          this._triggerKeyHandler(keyCombo, handlerName, event);
+          if (event.defaultPrevented) {
+            return;
           }
         }
+      }
+    },
+    _triggerKeyHandler: function(keyCombo, handlerName, keyboardEvent) {
+      var detail = Object.create(keyCombo);
+      detail.keyboardEvent = keyboardEvent;
+      var event = new CustomEvent(keyCombo.event, {
+        detail: detail,
+        cancelable: true
+      });
+      this[handlerName].call(this, event);
+      if (event.defaultPrevented) {
+        keyboardEvent.preventDefault();
+      }
+    }
+  };
+})();
+
+Polymer.IronControlState = {
+  properties: {
+    focused: {
+      type: Boolean,
+      value: false,
+      notify: true,
+      readOnly: true,
+      reflectToAttribute: true
+    },
+    disabled: {
+      type: Boolean,
+      value: false,
+      notify: true,
+      observer: '_disabledChanged',
+      reflectToAttribute: true
+    },
+    _oldTabIndex: {
+      type: Number
+    },
+    _boundFocusBlurHandler: {
+      type: Function,
+      value: function() {
+        return this._focusBlurHandler.bind(this);
+      }
+    }
+  },
+  observers: [ '_changedControlState(focused, disabled)' ],
+  ready: function() {
+    this.addEventListener('focus', this._boundFocusBlurHandler, true);
+    this.addEventListener('blur', this._boundFocusBlurHandler, true);
+  },
+  _focusBlurHandler: function(event) {
+    if (event.target === this) {
+      this._setFocused(event.type === 'focus');
+    } else if (!this.shadowRoot) {
+      var target = Polymer.dom(event).localTarget;
+      if (!this.isLightDescendant(target)) {
+        this.fire(event.type, {
+          sourceEvent: event
+        }, {
+          node: this,
+          bubbles: event.bubbles,
+          cancelable: event.cancelable
+        });
+      }
+    }
+  },
+  _disabledChanged: function(disabled, old) {
+    this.setAttribute('aria-disabled', disabled ? 'true' : 'false');
+    this.style.pointerEvents = disabled ? 'none' : '';
+    if (disabled) {
+      this._oldTabIndex = this.tabIndex;
+      this._setFocused(false);
+      this.tabIndex = -1;
+      this.blur();
+    } else if (this._oldTabIndex !== undefined) {
+      this.tabIndex = this._oldTabIndex;
+    }
+  },
+  _changedControlState: function() {
+    if (this._controlStateChanged) {
+      this._controlStateChanged();
+    }
+  }
+};
+
+Polymer.IronButtonStateImpl = {
+  properties: {
+    pressed: {
+      type: Boolean,
+      readOnly: true,
+      value: false,
+      reflectToAttribute: true,
+      observer: '_pressedChanged'
+    },
+    toggles: {
+      type: Boolean,
+      value: false,
+      reflectToAttribute: true
+    },
+    active: {
+      type: Boolean,
+      value: false,
+      notify: true,
+      reflectToAttribute: true
+    },
+    pointerDown: {
+      type: Boolean,
+      readOnly: true,
+      value: false
+    },
+    receivedFocusFromKeyboard: {
+      type: Boolean,
+      readOnly: true
+    },
+    ariaActiveAttribute: {
+      type: String,
+      value: 'aria-pressed',
+      observer: '_ariaActiveAttributeChanged'
+    }
+  },
+  listeners: {
+    down: '_downHandler',
+    up: '_upHandler',
+    tap: '_tapHandler'
+  },
+  observers: [ '_detectKeyboardFocus(focused)', '_activeChanged(active, ariaActiveAttribute)' ],
+  keyBindings: {
+    'enter:keydown': '_asyncClick',
+    'space:keydown': '_spaceKeyDownHandler',
+    'space:keyup': '_spaceKeyUpHandler'
+  },
+  _mouseEventRe: /^mouse/,
+  _tapHandler: function() {
+    if (this.toggles) {
+      this._userActivate(!this.active);
+    } else {
+      this.active = false;
+    }
+  },
+  _detectKeyboardFocus: function(focused) {
+    this._setReceivedFocusFromKeyboard(!this.pointerDown && focused);
+  },
+  _userActivate: function(active) {
+    if (this.active !== active) {
+      this.active = active;
+      this.fire('change');
+    }
+  },
+  _downHandler: function(event) {
+    this._setPointerDown(true);
+    this._setPressed(true);
+    this._setReceivedFocusFromKeyboard(false);
+  },
+  _upHandler: function() {
+    this._setPointerDown(false);
+    this._setPressed(false);
+  },
+  _spaceKeyDownHandler: function(event) {
+    var keyboardEvent = event.detail.keyboardEvent;
+    var target = Polymer.dom(keyboardEvent).localTarget;
+    if (this.isLightDescendant(target)) return;
+    keyboardEvent.preventDefault();
+    keyboardEvent.stopImmediatePropagation();
+    this._setPressed(true);
+  },
+  _spaceKeyUpHandler: function(event) {
+    var keyboardEvent = event.detail.keyboardEvent;
+    var target = Polymer.dom(keyboardEvent).localTarget;
+    if (this.isLightDescendant(target)) return;
+    if (this.pressed) {
+      this._asyncClick();
+    }
+    this._setPressed(false);
+  },
+  _asyncClick: function() {
+    this.async(function() {
+      this.click();
+    }, 1);
+  },
+  _pressedChanged: function(pressed) {
+    this._changedButtonState();
+  },
+  _ariaActiveAttributeChanged: function(value, oldValue) {
+    if (oldValue && oldValue != value && this.hasAttribute(oldValue)) {
+      this.removeAttribute(oldValue);
+    }
+  },
+  _activeChanged: function(active, ariaActiveAttribute) {
+    if (this.toggles) {
+      this.setAttribute(this.ariaActiveAttribute, active ? 'true' : 'false');
+    } else {
+      this.removeAttribute(this.ariaActiveAttribute);
+    }
+    this._changedButtonState();
+  },
+  _controlStateChanged: function() {
+    if (this.disabled) {
+      this._setPressed(false);
+    } else {
+      this._changedButtonState();
+    }
+  },
+  _changedButtonState: function() {
+    if (this._buttonStateChanged) {
+      this._buttonStateChanged();
+    }
+  }
+};
+
+Polymer.IronButtonState = [ Polymer.IronA11yKeysBehavior, Polymer.IronButtonStateImpl ];
+
+(function() {
+  var Utility = {
+    distance: function(x1, y1, x2, y2) {
+      var xDelta = x1 - x2;
+      var yDelta = y1 - y2;
+      return Math.sqrt(xDelta * xDelta + yDelta * yDelta);
+    },
+    now: window.performance && window.performance.now ? window.performance.now.bind(window.performance) : Date.now
+  };
+  function ElementMetrics(element) {
+    this.element = element;
+    this.width = this.boundingRect.width;
+    this.height = this.boundingRect.height;
+    this.size = Math.max(this.width, this.height);
+  }
+  ElementMetrics.prototype = {
+    get boundingRect() {
+      return this.element.getBoundingClientRect();
+    },
+    furthestCornerDistanceFrom: function(x, y) {
+      var topLeft = Utility.distance(x, y, 0, 0);
+      var topRight = Utility.distance(x, y, this.width, 0);
+      var bottomLeft = Utility.distance(x, y, 0, this.height);
+      var bottomRight = Utility.distance(x, y, this.width, this.height);
+      return Math.max(topLeft, topRight, bottomLeft, bottomRight);
+    }
+  };
+  function Ripple(element) {
+    this.element = element;
+    this.color = window.getComputedStyle(element).color;
+    this.wave = document.createElement('div');
+    this.waveContainer = document.createElement('div');
+    this.wave.style.backgroundColor = this.color;
+    this.wave.classList.add('wave');
+    this.waveContainer.classList.add('wave-container');
+    Polymer.dom(this.waveContainer).appendChild(this.wave);
+    this.resetInteractionState();
+  }
+  Ripple.MAX_RADIUS = 300;
+  Ripple.prototype = {
+    get recenters() {
+      return this.element.recenters;
+    },
+    get center() {
+      return this.element.center;
+    },
+    get mouseDownElapsed() {
+      var elapsed;
+      if (!this.mouseDownStart) {
+        return 0;
+      }
+      elapsed = Utility.now() - this.mouseDownStart;
+      if (this.mouseUpStart) {
+        elapsed -= this.mouseUpElapsed;
+      }
+      return elapsed;
+    },
+    get mouseUpElapsed() {
+      return this.mouseUpStart ? Utility.now() - this.mouseUpStart : 0;
+    },
+    get mouseDownElapsedSeconds() {
+      return this.mouseDownElapsed / 1e3;
+    },
+    get mouseUpElapsedSeconds() {
+      return this.mouseUpElapsed / 1e3;
+    },
+    get mouseInteractionSeconds() {
+      return this.mouseDownElapsedSeconds + this.mouseUpElapsedSeconds;
+    },
+    get initialOpacity() {
+      return this.element.initialOpacity;
+    },
+    get opacityDecayVelocity() {
+      return this.element.opacityDecayVelocity;
+    },
+    get radius() {
+      var width2 = this.containerMetrics.width * this.containerMetrics.width;
+      var height2 = this.containerMetrics.height * this.containerMetrics.height;
+      var waveRadius = Math.min(Math.sqrt(width2 + height2), Ripple.MAX_RADIUS) * 1.1 + 5;
+      var duration = 1.1 - .2 * (waveRadius / Ripple.MAX_RADIUS);
+      var timeNow = this.mouseInteractionSeconds / duration;
+      var size = waveRadius * (1 - Math.pow(80, -timeNow));
+      return Math.abs(size);
+    },
+    get opacity() {
+      if (!this.mouseUpStart) {
+        return this.initialOpacity;
+      }
+      return Math.max(0, this.initialOpacity - this.mouseUpElapsedSeconds * this.opacityDecayVelocity);
+    },
+    get outerOpacity() {
+      var outerOpacity = this.mouseUpElapsedSeconds * .3;
+      var waveOpacity = this.opacity;
+      return Math.max(0, Math.min(outerOpacity, waveOpacity));
+    },
+    get isOpacityFullyDecayed() {
+      return this.opacity < .01 && this.radius >= Math.min(this.maxRadius, Ripple.MAX_RADIUS);
+    },
+    get isRestingAtMaxRadius() {
+      return this.opacity >= this.initialOpacity && this.radius >= Math.min(this.maxRadius, Ripple.MAX_RADIUS);
+    },
+    get isAnimationComplete() {
+      return this.mouseUpStart ? this.isOpacityFullyDecayed : this.isRestingAtMaxRadius;
+    },
+    get translationFraction() {
+      return Math.min(1, this.radius / this.containerMetrics.size * 2 / Math.sqrt(2));
+    },
+    get xNow() {
+      if (this.xEnd) {
+        return this.xStart + this.translationFraction * (this.xEnd - this.xStart);
+      }
+      return this.xStart;
+    },
+    get yNow() {
+      if (this.yEnd) {
+        return this.yStart + this.translationFraction * (this.yEnd - this.yStart);
+      }
+      return this.yStart;
+    },
+    get isMouseDown() {
+      return this.mouseDownStart && !this.mouseUpStart;
+    },
+    resetInteractionState: function() {
+      this.maxRadius = 0;
+      this.mouseDownStart = 0;
+      this.mouseUpStart = 0;
+      this.xStart = 0;
+      this.yStart = 0;
+      this.xEnd = 0;
+      this.yEnd = 0;
+      this.slideDistance = 0;
+      this.containerMetrics = new ElementMetrics(this.element);
+    },
+    draw: function() {
+      var scale;
+      var translateString;
+      var dx;
+      var dy;
+      this.wave.style.opacity = this.opacity;
+      scale = this.radius / (this.containerMetrics.size / 2);
+      dx = this.xNow - this.containerMetrics.width / 2;
+      dy = this.yNow - this.containerMetrics.height / 2;
+      this.waveContainer.style.webkitTransform = 'translate(' + dx + 'px, ' + dy + 'px)';
+      this.waveContainer.style.transform = 'translate3d(' + dx + 'px, ' + dy + 'px, 0)';
+      this.wave.style.webkitTransform = 'scale(' + scale + ',' + scale + ')';
+      this.wave.style.transform = 'scale3d(' + scale + ',' + scale + ',1)';
+    },
+    downAction: function(event) {
+      var xCenter = this.containerMetrics.width / 2;
+      var yCenter = this.containerMetrics.height / 2;
+      this.resetInteractionState();
+      this.mouseDownStart = Utility.now();
+      if (this.center) {
+        this.xStart = xCenter;
+        this.yStart = yCenter;
+        this.slideDistance = Utility.distance(this.xStart, this.yStart, this.xEnd, this.yEnd);
       } else {
-        return Number(value);
-      }
-    },
-
-    _indexToValue: function(index) {
-      if (this.attrForSelected) {
-        var item = this.items[index];
-        if (item) {
-          return this._valueForItem(item);
+        this.xStart = event ? event.detail.x - this.containerMetrics.boundingRect.left : this.containerMetrics.width / 2;
+        this.yStart = event ? event.detail.y - this.containerMetrics.boundingRect.top : this.containerMetrics.height / 2;
+      }
+      if (this.recenters) {
+        this.xEnd = xCenter;
+        this.yEnd = yCenter;
+        this.slideDistance = Utility.distance(this.xStart, this.yStart, this.xEnd, this.yEnd);
+      }
+      this.maxRadius = this.containerMetrics.furthestCornerDistanceFrom(this.xStart, this.yStart);
+      this.waveContainer.style.top = (this.containerMetrics.height - this.containerMetrics.size) / 2 + 'px';
+      this.waveContainer.style.left = (this.containerMetrics.width - this.containerMetrics.size) / 2 + 'px';
+      this.waveContainer.style.width = this.containerMetrics.size + 'px';
+      this.waveContainer.style.height = this.containerMetrics.size + 'px';
+    },
+    upAction: function(event) {
+      if (!this.isMouseDown) {
+        return;
+      }
+      this.mouseUpStart = Utility.now();
+    },
+    remove: function() {
+      Polymer.dom(this.waveContainer.parentNode).removeChild(this.waveContainer);
+    }
+  };
+  Polymer({
+    is: 'paper-ripple',
+    behaviors: [ Polymer.IronA11yKeysBehavior ],
+    properties: {
+      initialOpacity: {
+        type: Number,
+        value: .25
+      },
+      opacityDecayVelocity: {
+        type: Number,
+        value: .8
+      },
+      recenters: {
+        type: Boolean,
+        value: false
+      },
+      center: {
+        type: Boolean,
+        value: false
+      },
+      ripples: {
+        type: Array,
+        value: function() {
+          return [];
         }
+      },
+      animating: {
+        type: Boolean,
+        readOnly: true,
+        reflectToAttribute: true,
+        value: false
+      },
+      holdDown: {
+        type: Boolean,
+        value: false,
+        observer: '_holdDownChanged'
+      },
+      noink: {
+        type: Boolean,
+        value: false
+      },
+      _animating: {
+        type: Boolean
+      },
+      _boundAnimate: {
+        type: Function,
+        value: function() {
+          return this.animate.bind(this);
+        }
+      }
+    },
+    get target() {
+      return this.keyEventTarget;
+    },
+    keyBindings: {
+      'enter:keydown': '_onEnterKeydown',
+      'space:keydown': '_onSpaceKeydown',
+      'space:keyup': '_onSpaceKeyup'
+    },
+    attached: function() {
+      if (this.parentNode.nodeType == 11) {
+        this.keyEventTarget = Polymer.dom(this).getOwnerRoot().host;
       } else {
-        return index;
-      }
-    },
-
-    _valueForItem: function(item) {
-      var propValue = item[Polymer.CaseMap.dashToCamelCase(this.attrForSelected)];
-      return propValue != undefined ? propValue : item.getAttribute(this.attrForSelected);
-    },
-
-    _applySelection: function(item, isSelected) {
-      if (this.selectedClass) {
-        this.toggleClass(this.selectedClass, isSelected, item);
-      }
-      if (this.selectedAttribute) {
-        this.toggleAttribute(this.selectedAttribute, isSelected, item);
-      }
-      this._selectionChange();
-      this.fire('iron-' + (isSelected ? 'select' : 'deselect'), {item: item});
-    },
-
-    _selectionChange: function() {
-      this._setSelectedItem(this._selection.get());
-    },
-
-    // observe items change under the given node.
-    _observeItems: function(node) {
-      return Polymer.dom(node).observeNodes(function(mutation) {
-        this._updateItems();
-
-        if (this._shouldUpdateSelection) {
-          this._updateSelected();
+        this.keyEventTarget = this.parentNode;
+      }
+      var keyEventTarget = this.keyEventTarget;
+      this.listen(keyEventTarget, 'up', 'uiUpAction');
+      this.listen(keyEventTarget, 'down', 'uiDownAction');
+    },
+    detached: function() {
+      this.unlisten(this.keyEventTarget, 'up', 'uiUpAction');
+      this.unlisten(this.keyEventTarget, 'down', 'uiDownAction');
+      this.keyEventTarget = null;
+    },
+    get shouldKeepAnimating() {
+      for (var index = 0; index < this.ripples.length; ++index) {
+        if (!this.ripples[index].isAnimationComplete) {
+          return true;
         }
-
-        // Let other interested parties know about the change so that
-        // we don't have to recreate mutation observers everywhere.
-        this.fire('iron-items-changed', mutation, {
-          bubbles: false,
-          cancelable: false
-        });
+      }
+      return false;
+    },
+    simulatedRipple: function() {
+      this.downAction(null);
+      this.async(function() {
+        this.upAction();
+      }, 1);
+    },
+    uiDownAction: function(event) {
+      if (!this.noink) {
+        this.downAction(event);
+      }
+    },
+    downAction: function(event) {
+      if (this.holdDown && this.ripples.length > 0) {
+        return;
+      }
+      var ripple = this.addRipple();
+      ripple.downAction(event);
+      if (!this._animating) {
+        this._animating = true;
+        this.animate();
+      }
+    },
+    uiUpAction: function(event) {
+      if (!this.noink) {
+        this.upAction(event);
+      }
+    },
+    upAction: function(event) {
+      if (this.holdDown) {
+        return;
+      }
+      this.ripples.forEach(function(ripple) {
+        ripple.upAction(event);
       });
-    },
-
-    _activateHandler: function(e) {
-      var t = e.target;
-      var items = this.items;
-      while (t && t != this) {
-        var i = items.indexOf(t);
-        if (i >= 0) {
-          var value = this._indexToValue(i);
-          this._itemActivate(value, t);
-          return;
+      this._animating = true;
+      this.animate();
+    },
+    onAnimationComplete: function() {
+      this._animating = false;
+      this.$.background.style.backgroundColor = null;
+      this.fire('transitionend');
+    },
+    addRipple: function() {
+      var ripple = new Ripple(this);
+      Polymer.dom(this.$.waves).appendChild(ripple.waveContainer);
+      this.$.background.style.backgroundColor = ripple.color;
+      this.ripples.push(ripple);
+      this._setAnimating(true);
+      return ripple;
+    },
+    removeRipple: function(ripple) {
+      var rippleIndex = this.ripples.indexOf(ripple);
+      if (rippleIndex < 0) {
+        return;
+      }
+      this.ripples.splice(rippleIndex, 1);
+      ripple.remove();
+      if (!this.ripples.length) {
+        this._setAnimating(false);
+      }
+    },
+    animate: function() {
+      if (!this._animating) {
+        return;
+      }
+      var index;
+      var ripple;
+      for (index = 0; index < this.ripples.length; ++index) {
+        ripple = this.ripples[index];
+        ripple.draw();
+        this.$.background.style.opacity = ripple.outerOpacity;
+        if (ripple.isOpacityFullyDecayed && !ripple.isRestingAtMaxRadius) {
+          this.removeRipple(ripple);
         }
-        t = t.parentNode;
-      }
-    },
-
-    _itemActivate: function(value, item) {
-      if (!this.fire('iron-activate',
-          {selected: value, item: item}, {cancelable: true}).defaultPrevented) {
-        this.select(value);
-      }
-    }
-
-  };
+      }
+      if (!this.shouldKeepAnimating && this.ripples.length === 0) {
+        this.onAnimationComplete();
+      } else {
+        window.requestAnimationFrame(this._boundAnimate);
+      }
+    },
+    _onEnterKeydown: function() {
+      this.uiDownAction();
+      this.async(this.uiUpAction, 1);
+    },
+    _onSpaceKeydown: function() {
+      this.uiDownAction();
+    },
+    _onSpaceKeyup: function() {
+      this.uiUpAction();
+    },
+    _holdDownChanged: function(newVal, oldVal) {
+      if (oldVal === undefined) {
+        return;
+      }
+      if (newVal) {
+        this.downAction();
+      } else {
+        this.upAction();
+      }
+    }
+  });
+})();
+
+Polymer.PaperRippleBehavior = {
+  properties: {
+    noink: {
+      type: Boolean,
+      observer: '_noinkChanged'
+    },
+    _rippleContainer: {
+      type: Object
+    }
+  },
+  _buttonStateChanged: function() {
+    if (this.focused) {
+      this.ensureRipple();
+    }
+  },
+  _downHandler: function(event) {
+    Polymer.IronButtonStateImpl._downHandler.call(this, event);
+    if (this.pressed) {
+      this.ensureRipple(event);
+    }
+  },
+  ensureRipple: function(optTriggeringEvent) {
+    if (!this.hasRipple()) {
+      this._ripple = this._createRipple();
+      this._ripple.noink = this.noink;
+      var rippleContainer = this._rippleContainer || this.root;
+      if (rippleContainer) {
+        Polymer.dom(rippleContainer).appendChild(this._ripple);
+      }
+      if (optTriggeringEvent) {
+        var domContainer = Polymer.dom(this._rippleContainer || this);
+        var target = Polymer.dom(optTriggeringEvent).rootTarget;
+        if (domContainer.deepContains(target)) {
+          this._ripple.uiDownAction(optTriggeringEvent);
+        }
+      }
+    }
+  },
+  getRipple: function() {
+    this.ensureRipple();
+    return this._ripple;
+  },
+  hasRipple: function() {
+    return Boolean(this._ripple);
+  },
+  _createRipple: function() {
+    return document.createElement('paper-ripple');
+  },
+  _noinkChanged: function(noink) {
+    if (this.hasRipple()) {
+      this._ripple.noink = noink;
+    }
+  }
+};
+
+Polymer.PaperButtonBehaviorImpl = {
+  properties: {
+    elevation: {
+      type: Number,
+      reflectToAttribute: true,
+      readOnly: true
+    }
+  },
+  observers: [ '_calculateElevation(focused, disabled, active, pressed, receivedFocusFromKeyboard)', '_computeKeyboardClass(receivedFocusFromKeyboard)' ],
+  hostAttributes: {
+    role: 'button',
+    tabindex: '0',
+    animated: true
+  },
+  _calculateElevation: function() {
+    var e = 1;
+    if (this.disabled) {
+      e = 0;
+    } else if (this.active || this.pressed) {
+      e = 4;
+    } else if (this.receivedFocusFromKeyboard) {
+      e = 3;
+    }
+    this._setElevation(e);
+  },
+  _computeKeyboardClass: function(receivedFocusFromKeyboard) {
+    this.toggleClass('keyboard-focus', receivedFocusFromKeyboard);
+  },
+  _spaceKeyDownHandler: function(event) {
+    Polymer.IronButtonStateImpl._spaceKeyDownHandler.call(this, event);
+    if (this.hasRipple() && this.getRipple().ripples.length < 1) {
+      this._ripple.uiDownAction();
+    }
+  },
+  _spaceKeyUpHandler: function(event) {
+    Polymer.IronButtonStateImpl._spaceKeyUpHandler.call(this, event);
+    if (this.hasRipple()) {
+      this._ripple.uiUpAction();
+    }
+  }
+};
+
+Polymer.PaperButtonBehavior = [ Polymer.IronButtonState, Polymer.IronControlState, Polymer.PaperRippleBehavior, Polymer.PaperButtonBehaviorImpl ];
+
 Polymer({
-
-      is: 'iron-pages',
-
-      behaviors: [
-        Polymer.IronResizableBehavior,
-        Polymer.IronSelectableBehavior
-      ],
-
-      properties: {
-
-        // as the selected page is the only one visible, activateEvent
-        // is both non-sensical and problematic; e.g. in cases where a user
-        // handler attempts to change the page and the activateEvent
-        // handler immediately changes it back
-        activateEvent: {
-          type: String,
-          value: null
-        }
-
+  is: 'paper-button',
+  behaviors: [ Polymer.PaperButtonBehavior ],
+  properties: {
+    raised: {
+      type: Boolean,
+      reflectToAttribute: true,
+      value: false,
+      observer: '_calculateElevation'
+    }
+  },
+  _calculateElevation: function() {
+    if (!this.raised) {
+      this._setElevation(0);
+    } else {
+      Polymer.PaperButtonBehaviorImpl._calculateElevation.apply(this);
+    }
+  }
+});
+
+(function() {
+  var metaDatas = {};
+  var metaArrays = {};
+  var singleton = null;
+  Polymer.IronMeta = Polymer({
+    is: 'iron-meta',
+    properties: {
+      type: {
+        type: String,
+        value: 'default',
+        observer: '_typeChanged'
       },
-
-      observers: [
-        '_selectedPageChanged(selected)'
-      ],
-
-      _selectedPageChanged: function(selected, old) {
-        this.async(this.notifyResize);
-      }
-    });
-(function() {
-    'use strict';
-
-    /**
-     * Chrome uses an older version of DOM Level 3 Keyboard Events
-     *
-     * Most keys are labeled as text, but some are Unicode codepoints.
-     * Values taken from: http://www.w3.org/TR/2007/WD-DOM-Level-3-Events-20071221/keyset.html#KeySet-Set
-     */
-    var KEY_IDENTIFIER = {
-      'U+0008': 'backspace',
-      'U+0009': 'tab',
-      'U+001B': 'esc',
-      'U+0020': 'space',
-      'U+007F': 'del'
-    };
-
-    /**
-     * Special table for KeyboardEvent.keyCode.
-     * KeyboardEvent.keyIdentifier is better, and KeyBoardEvent.key is even better
-     * than that.
-     *
-     * Values from: https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent.keyCode#Value_of_keyCode
-     */
-    var KEY_CODE = {
-      8: 'backspace',
-      9: 'tab',
-      13: 'enter',
-      27: 'esc',
-      33: 'pageup',
-      34: 'pagedown',
-      35: 'end',
-      36: 'home',
-      32: 'space',
-      37: 'left',
-      38: 'up',
-      39: 'right',
-      40: 'down',
-      46: 'del',
-      106: '*'
-    };
-
-    /**
-     * MODIFIER_KEYS maps the short name for modifier keys used in a key
-     * combo string to the property name that references those same keys
-     * in a KeyboardEvent instance.
-     */
-    var MODIFIER_KEYS = {
-      'shift': 'shiftKey',
-      'ctrl': 'ctrlKey',
-      'alt': 'altKey',
-      'meta': 'metaKey'
-    };
-
-    /**
-     * KeyboardEvent.key is mostly represented by printable character made by
-     * the keyboard, with unprintable keys labeled nicely.
-     *
-     * However, on OS X, Alt+char can make a Unicode character that follows an
-     * Apple-specific mapping. In this case, we fall back to .keyCode.
-     */
-    var KEY_CHAR = /[a-z0-9*]/;
-
-    /**
-     * Matches a keyIdentifier string.
-     */
-    var IDENT_CHAR = /U\+/;
-
-    /**
-     * Matches arrow keys in Gecko 27.0+
-     */
-    var ARROW_KEY = /^arrow/;
-
-    /**
-     * Matches space keys everywhere (notably including IE10's exceptional name
-     * `spacebar`).
-     */
-    var SPACE_KEY = /^space(bar)?/;
-
-    /**
-     * Matches ESC key.
-     *
-     * Value from: http://w3c.github.io/uievents-key/#key-Escape
-     */
-    var ESC_KEY = /^escape$/;
-
-    /**
-     * Transforms the key.
-     * @param {string} key The KeyBoardEvent.key
-     * @param {Boolean} [noSpecialChars] Limits the transformation to
-     * alpha-numeric characters.
-     */
-    function transformKey(key, noSpecialChars) {
-      var validKey = '';
-      if (key) {
-        var lKey = key.toLowerCase();
-        if (lKey === ' ' || SPACE_KEY.test(lKey)) {
-          validKey = 'space';
-        } else if (ESC_KEY.test(lKey)) {
-          validKey = 'esc';
-        } else if (lKey.length == 1) {
-          if (!noSpecialChars || KEY_CHAR.test(lKey)) {
-            validKey = lKey;
-          }
-        } else if (ARROW_KEY.test(lKey)) {
-          validKey = lKey.replace('arrow', '');
-        } else if (lKey == 'multiply') {
-          // numpad '*' can map to Multiply on IE/Windows
-          validKey = '*';
-        } else {
-          validKey = lKey;
-        }
-      }
-      return validKey;
-    }
-
-    function transformKeyIdentifier(keyIdent) {
-      var validKey = '';
-      if (keyIdent) {
-        if (keyIdent in KEY_IDENTIFIER) {
-          validKey = KEY_IDENTIFIER[keyIdent];
-        } else if (IDENT_CHAR.test(keyIdent)) {
-          keyIdent = parseInt(keyIdent.replace('U+', '0x'), 16);
-          validKey = String.fromCharCode(keyIdent).toLowerCase();
-        } else {
-          validKey = keyIdent.toLowerCase();
-        }
-      }
-      return validKey;
-    }
-
-    function transformKeyCode(keyCode) {
-      var validKey = '';
-      if (Number(keyCode)) {
-        if (keyCode >= 65 && keyCode <= 90) {
-          // ascii a-z
-          // lowercase is 32 offset from uppercase
-          validKey = String.fromCharCode(32 + keyCode);
-        } else if (keyCode >= 112 && keyCode <= 123) {
-          // function keys f1-f12
-          validKey = 'f' + (keyCode - 112);
-        } else if (keyCode >= 48 && keyCode <= 57) {
-          // top 0-9 keys
-          validKey = String(keyCode - 48);
-        } else if (keyCode >= 96 && keyCode <= 105) {
-          // num pad 0-9
-          validKey = String(keyCode - 96);
-        } else {
-          validKey = KEY_CODE[keyCode];
-        }
-      }
-      return validKey;
-    }
-
-    /**
-      * Calculates the normalized key for a KeyboardEvent.
-      * @param {KeyboardEvent} keyEvent
-      * @param {Boolean} [noSpecialChars] Set to true to limit keyEvent.key
-      * transformation to alpha-numeric chars. This is useful with key
-      * combinations like shift + 2, which on FF for MacOS produces
-      * keyEvent.key = @
-      * To get 2 returned, set noSpecialChars = true
-      * To get @ returned, set noSpecialChars = false
-     */
-    function normalizedKeyForEvent(keyEvent, noSpecialChars) {
-      // Fall back from .key, to .keyIdentifier, to .keyCode, and then to
-      // .detail.key to support artificial keyboard events.
-      return transformKey(keyEvent.key, noSpecialChars) ||
-        transformKeyIdentifier(keyEvent.keyIdentifier) ||
-        transformKeyCode(keyEvent.keyCode) ||
-        transformKey(keyEvent.detail ? keyEvent.detail.key : keyEvent.detail, noSpecialChars) || '';
-    }
-
-    function keyComboMatchesEvent(keyCombo, event) {
-      // For combos with modifiers we support only alpha-numeric keys
-      var keyEvent = normalizedKeyForEvent(event, keyCombo.hasModifiers);
-      return keyEvent === keyCombo.key &&
-        (!keyCombo.hasModifiers || (
-          !!event.shiftKey === !!keyCombo.shiftKey &&
-          !!event.ctrlKey === !!keyCombo.ctrlKey &&
-          !!event.altKey === !!keyCombo.altKey &&
-          !!event.metaKey === !!keyCombo.metaKey)
-        );
-    }
-
-    function parseKeyComboString(keyComboString) {
-      if (keyComboString.length === 1) {
-        return {
-          combo: keyComboString,
-          key: keyComboString,
-          event: 'keydown'
-        };
-      }
-      return keyComboString.split('+').reduce(function(parsedKeyCombo, keyComboPart) {
-        var eventParts = keyComboPart.split(':');
-        var keyName = eventParts[0];
-        var event = eventParts[1];
-
-        if (keyName in MODIFIER_KEYS) {
-          parsedKeyCombo[MODIFIER_KEYS[keyName]] = true;
-          parsedKeyCombo.hasModifiers = true;
-        } else {
-          parsedKeyCombo.key = keyName;
-          parsedKeyCombo.event = event || 'keydown';
-        }
-
-        return parsedKeyCombo;
-      }, {
-        combo: keyComboString.split(':').shift()
-      });
-    }
-
-    function parseEventString(eventString) {
-      return eventString.trim().split(' ').map(function(keyComboString) {
-        return parseKeyComboString(keyComboString);
-      });
-    }
-
-    /**
-     * `Polymer.IronA11yKeysBehavior` provides a normalized interface for processing
-     * keyboard commands that pertain to [WAI-ARIA best practices](http://www.w3.org/TR/wai-aria-practices/#kbd_general_binding).
-     * The element takes care of browser differences with respect to Keyboard events
-     * and uses an expressive syntax to filter key presses.
-     *
-     * Use the `keyBindings` prototype property to express what combination of keys
-     * will trigger the callback. A key binding has the format
-     * `"KEY+MODIFIER:EVENT": "callback"` (`"KEY": "callback"` or
-     * `"KEY:EVENT": "callback"` are valid as well). Some examples:
-     *
-     *      keyBindings: {
-     *        'space': '_onKeydown', // same as 'space:keydown'
-     *        'shift+tab': '_onKeydown',
-     *        'enter:keypress': '_onKeypress',
-     *        'esc:keyup': '_onKeyup'
-     *      }
-     *
-     * The callback will receive with an event containing the following information in `event.detail`:
-     *
-     *      _onKeydown: function(event) {
-     *        console.log(event.detail.combo); // KEY+MODIFIER, e.g. "shift+tab"
-     *        console.log(event.detail.key); // KEY only, e.g. "tab"
-     *        console.log(event.detail.event); // EVENT, e.g. "keydown"
-     *        console.log(event.detail.keyboardEvent); // the original KeyboardEvent
-     *      }
-     *
-     * Use the `keyEventTarget` attribute to set up event handlers on a specific
-     * node.
-     *
-     * See the [demo source code](https://github.com/PolymerElements/iron-a11y-keys-behavior/blob/master/demo/x-key-aware.html)
-     * for an example.
-     *
-     * @demo demo/index.html
-     * @polymerBehavior
-     */
-    Polymer.IronA11yKeysBehavior = {
-      properties: {
-        /**
-         * The EventTarget that will be firing relevant KeyboardEvents. Set it to
-         * `null` to disable the listeners.
-         * @type {?EventTarget}
-         */
-        keyEventTarget: {
-          type: Object,
-          value: function() {
-            return this;
-          }
-        },
-
-        /**
-         * If true, this property will cause the implementing element to
-         * automatically stop propagation on any handled KeyboardEvents.
-         */
-        stopKeyboardEventPropagation: {
-          type: Boolean,
-          value: false
-        },
-
-        _boundKeyHandlers: {
-          type: Array,
-          value: function() {
-            return [];
-          }
-        },
-
-        // We use this due to a limitation in IE10 where instances will have
-        // own properties of everything on the "prototype".
-        _imperativeKeyBindings: {
-          type: Object,
-          value: function() {
-            return {};
+      key: {
+        type: String,
+        observer: '_keyChanged'
+      },
+      value: {
+        type: Object,
+        notify: true,
+        observer: '_valueChanged'
+      },
+      self: {
+        type: Boolean,
+        observer: '_selfChanged'
+      },
+      list: {
+        type: Array,
+        notify: true
+      }
+    },
+    hostAttributes: {
+      hidden: true
+    },
+    factoryImpl: function(config) {
+      if (config) {
+        for (var n in config) {
+          switch (n) {
+           case 'type':
+           case 'key':
+           case 'value':
+            this[n] = config[n];
+            break;
           }
         }
+      }
+    },
+    created: function() {
+      this._metaDatas = metaDatas;
+      this._metaArrays = metaArrays;
+    },
+    _keyChanged: function(key, old) {
+      this._resetRegistration(old);
+    },
+    _valueChanged: function(value) {
+      this._resetRegistration(this.key);
+    },
+    _selfChanged: function(self) {
+      if (self) {
+        this.value = this;
+      }
+    },
+    _typeChanged: function(type) {
+      this._unregisterKey(this.key);
+      if (!metaDatas[type]) {
+        metaDatas[type] = {};
+      }
+      this._metaData = metaDatas[type];
+      if (!metaArrays[type]) {
+        metaArrays[type] = [];
+      }
+      this.list = metaArrays[type];
+      this._registerKeyValue(this.key, this.value);
+    },
+    byKey: function(key) {
+      return this._metaData && this._metaData[key];
+    },
+    _resetRegistration: function(oldKey) {
+      this._unregisterKey(oldKey);
+      this._registerKeyValue(this.key, this.value);
+    },
+    _unregisterKey: function(key) {
+      this._unregister(key, this._metaData, this.list);
+    },
+    _registerKeyValue: function(key, value) {
+      this._register(key, value, this._metaData, this.list);
+    },
+    _register: function(key, value, data, list) {
+      if (key && data && value !== undefined) {
+        data[key] = value;
+        list.push(value);
+      }
+    },
+    _unregister: function(key, data, list) {
+      if (key && data) {
+        if (key in data) {
+          var value = data[key];
+          delete data[key];
+          this.arrayDelete(list, value);
+        }
+      }
+    }
+  });
+  Polymer.IronMeta.getIronMeta = function getIronMeta() {
+    if (singleton === null) {
+      singleton = new Polymer.IronMeta();
+    }
+    return singleton;
+  };
+  Polymer.IronMetaQuery = Polymer({
+    is: 'iron-meta-query',
+    properties: {
+      type: {
+        type: String,
+        value: 'default',
+        observer: '_typeChanged'
       },
-
-      observers: [
-        '_resetKeyEventListeners(keyEventTarget, _boundKeyHandlers)'
-      ],
-
-
-      /**
-       * To be used to express what combination of keys  will trigger the relative
-       * callback. e.g. `keyBindings: { 'esc': '_onEscPressed'}`
-       * @type {Object}
-       */
-      keyBindings: {},
-
-      registered: function() {
-        this._prepKeyBindings();
+      key: {
+        type: String,
+        observer: '_keyChanged'
       },
-
-      attached: function() {
-        this._listenKeyEventListeners();
+      value: {
+        type: Object,
+        notify: true,
+        readOnly: true
       },
-
-      detached: function() {
-        this._unlistenKeyEventListeners();
-      },
-
-      /**
-       * Can be used to imperatively add a key binding to the implementing
-       * element. This is the imperative equivalent of declaring a keybinding
-       * in the `keyBindings` prototype property.
-       */
-      addOwnKeyBinding: function(eventString, handlerName) {
-        this._imperativeKeyBindings[eventString] = handlerName;
-        this._prepKeyBindings();
-        this._resetKeyEventListeners();
-      },
-
-      /**
-       * When called, will remove all imperatively-added key bindings.
-       */
-      removeOwnKeyBindings: function() {
-        this._imperativeKeyBindings = {};
-        this._prepKeyBindings();
-        this._resetKeyEventListeners();
-      },
-
-      /**
-       * Returns true if a keyboard event matches `eventString`.
-       *
-       * @param {KeyboardEvent} event
-       * @param {string} eventString
-       * @return {boolean}
-       */
-      keyboardEventMatchesKeys: function(event, eventString) {
-        var keyCombos = parseEventString(eventString);
-        for (var i = 0; i < keyCombos.length; ++i) {
-          if (keyComboMatchesEvent(keyCombos[i], event)) {
-            return true;
+      list: {
+        type: Array,
+        notify: true
+      }
+    },
+    factoryImpl: function(config) {
+      if (config) {
+        for (var n in config) {
+          switch (n) {
+           case 'type':
+           case 'key':
+            this[n] = config[n];
+            break;
           }
         }
-        return false;
-      },
-
-      _collectKeyBindings: function() {
-        var keyBindings = this.behaviors.map(function(behavior) {
-          return behavior.keyBindings;
-        });
-
-        if (keyBindings.indexOf(this.keyBindings) === -1) {
-          keyBindings.push(this.keyBindings);
+      }
+    },
+    created: function() {
+      this._metaDatas = metaDatas;
+      this._metaArrays = metaArrays;
+    },
+    _keyChanged: function(key) {
+      this._setValue(this._metaData && this._metaData[key]);
+    },
+    _typeChanged: function(type) {
+      this._metaData = metaDatas[type];
+      this.list = metaArrays[type];
+      if (this.key) {
+        this._keyChanged(this.key);
+      }
+    },
+    byKey: function(key) {
+      return this._metaData && this._metaData[key];
+    }
+  });
+})();
+
+Polymer({
+  is: 'iron-icon',
+  properties: {
+    icon: {
+      type: String,
+      observer: '_iconChanged'
+    },
+    theme: {
+      type: String,
+      observer: '_updateIcon'
+    },
+    src: {
+      type: String,
+      observer: '_srcChanged'
+    },
+    _meta: {
+      value: Polymer.Base.create('iron-meta', {
+        type: 'iconset'
+      }),
+      observer: '_updateIcon'
+    }
+  },
+  _DEFAULT_ICONSET: 'icons',
+  _iconChanged: function(icon) {
+    var parts = (icon || '').split(':');
+    this._iconName = parts.pop();
+    this._iconsetName = parts.pop() || this._DEFAULT_ICONSET;
+    this._updateIcon();
+  },
+  _srcChanged: function(src) {
+    this._updateIcon();
+  },
+  _usesIconset: function() {
+    return this.icon || !this.src;
+  },
+  _updateIcon: function() {
+    if (this._usesIconset()) {
+      if (this._img && this._img.parentNode) {
+        Polymer.dom(this.root).removeChild(this._img);
+      }
+      if (this._iconName === "") {
+        if (this._iconset) {
+          this._iconset.removeIcon(this);
         }
-
-        return keyBindings;
-      },
-
-      _prepKeyBindings: function() {
-        this._keyBindings = {};
-
-        this._collectKeyBindings().forEach(function(keyBindings) {
-          for (var eventString in keyBindings) {
-            this._addKeyBinding(eventString, keyBindings[eventString]);
-          }
-        }, this);
-
-        for (var eventString in this._imperativeKeyBindings) {
-          this._addKeyBinding(eventString, this._imperativeKeyBindings[eventString]);
+      } else if (this._iconsetName && this._meta) {
+        this._iconset = this._meta.byKey(this._iconsetName);
+        if (this._iconset) {
+          this._iconset.applyIcon(this, this._iconName, this.theme);
+          this.unlisten(window, 'iron-iconset-added', '_updateIcon');
+        } else {
+          this.listen(window, 'iron-iconset-added', '_updateIcon');
         }
-
-        // Give precedence to combos with modifiers to be checked first.
-        for (var eventName in this._keyBindings) {
-          this._keyBindings[eventName].sort(function (kb1, kb2) {
-            var b1 = kb1[0].hasModifiers;
-            var b2 = kb2[0].hasModifiers;
-            return (b1 === b2) ? 0 : b1 ? -1 : 1;
-          })
+      }
+    } else {
+      if (this._iconset) {
+        this._iconset.removeIcon(this);
+      }
+      if (!this._img) {
+        this._img = document.createElement('img');
+        this._img.style.width = '100%';
+        this._img.style.height = '100%';
+        this._img.draggable = false;
+      }
+      this._img.src = this.src;
+      Polymer.dom(this.root).appendChild(this._img);
+    }
+  }
+});
+
+Polymer.PaperInkyFocusBehaviorImpl = {
+  observers: [ '_focusedChanged(receivedFocusFromKeyboard)' ],
+  _focusedChanged: function(receivedFocusFromKeyboard) {
+    if (receivedFocusFromKeyboard) {
+      this.ensureRipple();
+    }
+    if (this.hasRipple()) {
+      this._ripple.holdDown = receivedFocusFromKeyboard;
+    }
+  },
+  _createRipple: function() {
+    var ripple = Polymer.PaperRippleBehavior._createRipple();
+    ripple.id = 'ink';
+    ripple.setAttribute('center', '');
+    ripple.classList.add('circle');
+    return ripple;
+  }
+};
+
+Polymer.PaperInkyFocusBehavior = [ Polymer.IronButtonState, Polymer.IronControlState, Polymer.PaperRippleBehavior, Polymer.PaperInkyFocusBehaviorImpl ];
+
+Polymer({
+  is: 'paper-icon-button',
+  hostAttributes: {
+    role: 'button',
+    tabindex: '0'
+  },
+  behaviors: [ Polymer.PaperInkyFocusBehavior ],
+  properties: {
+    src: {
+      type: String
+    },
+    icon: {
+      type: String
+    },
+    alt: {
+      type: String,
+      observer: "_altChanged"
+    }
+  },
+  _altChanged: function(newValue, oldValue) {
+    var label = this.getAttribute('aria-label');
+    if (!label || oldValue == label) {
+      this.setAttribute('aria-label', newValue);
+    }
+  }
+});
+
+Polymer({
+  is: 'paper-tab',
+  behaviors: [ Polymer.IronControlState, Polymer.IronButtonState, Polymer.PaperRippleBehavior ],
+  properties: {
+    link: {
+      type: Boolean,
+      value: false,
+      reflectToAttribute: true
+    }
+  },
+  hostAttributes: {
+    role: 'tab'
+  },
+  listeners: {
+    down: '_updateNoink',
+    tap: '_onTap'
+  },
+  attached: function() {
+    this._updateNoink();
+  },
+  get _parentNoink() {
+    var parent = Polymer.dom(this).parentNode;
+    return !!parent && !!parent.noink;
+  },
+  _updateNoink: function() {
+    this.noink = !!this.noink || !!this._parentNoink;
+  },
+  _onTap: function(event) {
+    if (this.link) {
+      var anchor = this.queryEffectiveChildren('a');
+      if (!anchor) {
+        return;
+      }
+      if (event.target === anchor) {
+        return;
+      }
+      anchor.click();
+    }
+  }
+});
+
+Polymer.IronMultiSelectableBehaviorImpl = {
+  properties: {
+    multi: {
+      type: Boolean,
+      value: false,
+      observer: 'multiChanged'
+    },
+    selectedValues: {
+      type: Array,
+      notify: true
+    },
+    selectedItems: {
+      type: Array,
+      readOnly: true,
+      notify: true
+    }
+  },
+  observers: [ '_updateSelected(selectedValues.splices)' ],
+  select: function(value) {
+    if (this.multi) {
+      if (this.selectedValues) {
+        this._toggleSelected(value);
+      } else {
+        this.selectedValues = [ value ];
+      }
+    } else {
+      this.selected = value;
+    }
+  },
+  multiChanged: function(multi) {
+    this._selection.multi = multi;
+  },
+  get _shouldUpdateSelection() {
+    return this.selected != null || this.selectedValues != null && this.selectedValues.length;
+  },
+  _updateAttrForSelected: function() {
+    if (!this.multi) {
+      Polymer.IronSelectableBehavior._updateAttrForSelected.apply(this);
+    } else if (this._shouldUpdateSelection) {
+      this.selectedValues = this.selectedItems.map(function(selectedItem) {
+        return this._indexToValue(this.indexOf(selectedItem));
+      }, this).filter(function(unfilteredValue) {
+        return unfilteredValue != null;
+      }, this);
+    }
+  },
+  _updateSelected: function() {
+    if (this.multi) {
+      this._selectMulti(this.selectedValues);
+    } else {
+      this._selectSelected(this.selected);
+    }
+  },
+  _selectMulti: function(values) {
+    if (values) {
+      var selectedItems = this._valuesToItems(values);
+      this._selection.clear(selectedItems);
+      for (var i = 0; i < selectedItems.length; i++) {
+        this._selection.setItemSelected(selectedItems[i], true);
+      }
+      if (this.fallbackSelection && this.items.length && !this._selection.get().length) {
+        var fallback = this._valueToItem(this.fallbackSelection);
+        if (fallback) {
+          this.selectedValues = [ this.fallbackSelection ];
         }
-      },
-
-      _addKeyBinding: function(eventString, handlerName) {
-        parseEventString(eventString).forEach(function(keyCombo) {
-          this._keyBindings[keyCombo.event] =
-            this._keyBindings[keyCombo.event] || [];
-
-          this._keyBindings[keyCombo.event].push([
-            keyCombo,
-            handlerName
-          ]);
-        }, this);
-      },
-
-      _resetKeyEventListeners: function() {
-        this._unlistenKeyEventListeners();
-
-        if (this.isAttached) {
-          this._listenKeyEventListeners();
-        }
-      },
-
-      _listenKeyEventListeners: function() {
-        if (!this.keyEventTarget) {
-          return;
-        }
-        Object.keys(this._keyBindings).forEach(function(eventName) {
-          var keyBindings = this._keyBindings[eventName];
-          var boundKeyHandler = this._onKeyBindingEvent.bind(this, keyBindings);
-
-          this._boundKeyHandlers.push([this.keyEventTarget, eventName, boundKeyHandler]);
-
-          this.keyEventTarget.addEventListener(eventName, boundKeyHandler);
-        }, this);
-      },
-
-      _unlistenKeyEventListeners: function() {
-        var keyHandlerTuple;
-        var keyEventTarget;
-        var eventName;
-        var boundKeyHandler;
-
-        while (this._boundKeyHandlers.length) {
-          // My kingdom for block-scope binding and destructuring assignment..
-          keyHandlerTuple = this._boundKeyHandlers.pop();
-          keyEventTarget = keyHandlerTuple[0];
-          eventName = keyHandlerTuple[1];
-          boundKeyHandler = keyHandlerTuple[2];
-
-          keyEventTarget.removeEventListener(eventName, boundKeyHandler);
-        }
-      },
-
-      _onKeyBindingEvent: function(keyBindings, event) {
-        if (this.stopKeyboardEventPropagation) {
-          event.stopPropagation();
-        }
-
-        // if event has been already prevented, don't do anything
-        if (event.defaultPrevented) {
-          return;
-        }
-
-        for (var i = 0; i < keyBindings.length; i++) {
-          var keyCombo = keyBindings[i][0];
-          var handlerName = keyBindings[i][1];
-          if (keyComboMatchesEvent(keyCombo, event)) {
-            this._triggerKeyHandler(keyCombo, handlerName, event);
-            // exit the loop if eventDefault was prevented
-            if (event.defaultPrevented) {
-              return;
-            }
-          }
-        }
-      },
-
-      _triggerKeyHandler: function(keyCombo, handlerName, keyboardEvent) {
-        var detail = Object.create(keyCombo);
-        detail.keyboardEvent = keyboardEvent;
-        var event = new CustomEvent(keyCombo.event, {
-          detail: detail,
-          cancelable: true
-        });
-        this[handlerName].call(this, event);
-        if (event.defaultPrevented) {
-          keyboardEvent.preventDefault();
-        }
-      }
-    };
-  })();
-/**
-   * @demo demo/index.html
-   * @polymerBehavior
-   */
-  Polymer.IronControlState = {
-
-    properties: {
-
-      /**
-       * If true, the element currently has focus.
-       */
-      focused: {
-        type: Boolean,
-        value: false,
-        notify: true,
-        readOnly: true,
-        reflectToAttribute: true
-      },
-
-      /**
-       * If true, the user cannot interact with this element.
-       */
-      disabled: {
-        type: Boolean,
-        value: false,
-        notify: true,
-        observer: '_disabledChanged',
-        reflectToAttribute: true
-      },
-
-      _oldTabIndex: {
-        type: Number
-      },
-
-      _boundFocusBlurHandler: {
-        type: Function,
-        value: function() {
-          return this._focusBlurHandler.bind(this);
-        }
-      }
-
-    },
-
-    observers: [
-      '_changedControlState(focused, disabled)'
-    ],
-
-    ready: function() {
-      this.addEventListener('focus', this._boundFocusBlurHandler, true);
-      this.addEventListener('blur', this._boundFocusBlurHandler, true);
-    },
-
-    _focusBlurHandler: function(event) {
-      // NOTE(cdata):  if we are in ShadowDOM land, `event.target` will
-      // eventually become `this` due to retargeting; if we are not in
-      // ShadowDOM land, `event.target` will eventually become `this` due
-      // to the second conditional which fires a synthetic event (that is also
-      // handled). In either case, we can disregard `event.path`.
-
-      if (event.target === this) {
-        this._setFocused(event.type === 'focus');
-      } else if (!this.shadowRoot) {
-        var target = /** @type {Node} */(Polymer.dom(event).localTarget);
-        if (!this.isLightDescendant(target)) {
-          this.fire(event.type, {sourceEvent: event}, {
-            node: this,
-            bubbles: event.bubbles,
-            cancelable: event.cancelable
-          });
-        }
-      }
-    },
-
-    _disabledChanged: function(disabled, old) {
-      this.setAttribute('aria-disabled', disabled ? 'true' : 'false');
-      this.style.pointerEvents = disabled ? 'none' : '';
-      if (disabled) {
-        this._oldTabIndex = this.tabIndex;
-        this._setFocused(false);
-        this.tabIndex = -1;
-        this.blur();
-      } else if (this._oldTabIndex !== undefined) {
-        this.tabIndex = this._oldTabIndex;
-      }
-    },
-
-    _changedControlState: function() {
-      // _controlStateChanged is abstract, follow-on behaviors may implement it
-      if (this._controlStateChanged) {
-        this._controlStateChanged();
-      }
-    }
-
-  };
-/**
-   * @demo demo/index.html
-   * @polymerBehavior Polymer.IronButtonState
-   */
-  Polymer.IronButtonStateImpl = {
-
-    properties: {
-
-      /**
-       * If true, the user is currently holding down the button.
-       */
-      pressed: {
-        type: Boolean,
-        readOnly: true,
-        value: false,
-        reflectToAttribute: true,
-        observer: '_pressedChanged'
-      },
-
-      /**
-       * If true, the button toggles the active state with each tap or press
-       * of the spacebar.
-       */
-      toggles: {
-        type: Boolean,
-        value: false,
-        reflectToAttribute: true
-      },
-
-      /**
-       * If true, the button is a toggle and is currently in the active state.
-       */
-      active: {
-        type: Boolean,
-        value: false,
-        notify: true,
-        reflectToAttribute: true
-      },
-
-      /**
-       * True if the element is currently being pressed by a "pointer," which
-       * is loosely defined as mouse or touch input (but specifically excluding
-       * keyboard input).
-       */
-      pointerDown: {
-        type: Boolean,
-        readOnly: true,
-        value: false
-      },
-
-      /**
-       * True if the input device that caused the element to receive focus
-       * was a keyboard.
-       */
-      receivedFocusFromKeyboard: {
-        type: Boolean,
-        readOnly: true
-      },
-
-      /**
-       * The aria attribute to be set if the button is a toggle and in the
-       * active state.
-       */
-      ariaActiveAttribute: {
-        type: String,
-        value: 'aria-pressed',
-        observer: '_ariaActiveAttributeChanged'
-      }
-    },
-
-    listeners: {
-      down: '_downHandler',
-      up: '_upHandler',
-      tap: '_tapHandler'
-    },
-
-    observers: [
-      '_detectKeyboardFocus(focused)',
-      '_activeChanged(active, ariaActiveAttribute)'
-    ],
-
-    keyBindings: {
-      'enter:keydown': '_asyncClick',
-      'space:keydown': '_spaceKeyDownHandler',
-      'space:keyup': '_spaceKeyUpHandler',
-    },
-
-    _mouseEventRe: /^mouse/,
-
-    _tapHandler: function() {
-      if (this.toggles) {
-       // a tap is needed to toggle the active state
-        this._userActivate(!this.active);
-      } else {
-        this.active = false;
-      }
-    },
-
-    _detectKeyboardFocus: function(focused) {
-      this._setReceivedFocusFromKeyboard(!this.pointerDown && focused);
-    },
-
-    // to emulate native checkbox, (de-)activations from a user interaction fire
-    // 'change' events
-    _userActivate: function(active) {
-      if (this.active !== active) {
-        this.active = active;
-        this.fire('change');
-      }
-    },
-
-    _downHandler: function(event) {
-      this._setPointerDown(true);
-      this._setPressed(true);
-      this._setReceivedFocusFromKeyboard(false);
-    },
-
-    _upHandler: function() {
-      this._setPointerDown(false);
-      this._setPressed(false);
-    },
-
-    /**
-     * @param {!KeyboardEvent} event .
-     */
-    _spaceKeyDownHandler: function(event) {
-      var keyboardEvent = event.detail.keyboardEvent;
-      var target = Polymer.dom(keyboardEvent).localTarget;
-
-      // Ignore the event if this is coming from a focused light child, since that
-      // element will deal with it.
-      if (this.isLightDescendant(/** @type {Node} */(target)))
+      }
+    } else {
+      this._selection.clear();
+    }
+  },
+  _selectionChange: function() {
+    var s = this._selection.get();
+    if (this.multi) {
+      this._setSelectedItems(s);
+    } else {
+      this._setSelectedItems([ s ]);
+      this._setSelectedItem(s);
+    }
+  },
+  _toggleSelected: function(value) {
+    var i = this.selectedValues.indexOf(value);
+    var unselected = i < 0;
+    if (unselected) {
+      this.push('selectedValues', value);
+    } else {
+      this.splice('selectedValues', i, 1);
+    }
+  },
+  _valuesToItems: function(values) {
+    return values == null ? null : values.map(function(value) {
+      return this._valueToItem(value);
+    }, this);
+  }
+};
+
+Polymer.IronMultiSelectableBehavior = [ Polymer.IronSelectableBehavior, Polymer.IronMultiSelectableBehaviorImpl ];
+
+Polymer.IronMenuBehaviorImpl = {
+  properties: {
+    focusedItem: {
+      observer: '_focusedItemChanged',
+      readOnly: true,
+      type: Object
+    },
+    attrForItemTitle: {
+      type: String
+    }
+  },
+  hostAttributes: {
+    role: 'menu',
+    tabindex: '0'
+  },
+  observers: [ '_updateMultiselectable(multi)' ],
+  listeners: {
+    focus: '_onFocus',
+    keydown: '_onKeydown',
+    'iron-items-changed': '_onIronItemsChanged'
+  },
+  keyBindings: {
+    up: '_onUpKey',
+    down: '_onDownKey',
+    esc: '_onEscKey',
+    'shift+tab:keydown': '_onShiftTabDown'
+  },
+  attached: function() {
+    this._resetTabindices();
+  },
+  select: function(value) {
+    if (this._defaultFocusAsync) {
+      this.cancelAsync(this._defaultFocusAsync);
+      this._defaultFocusAsync = null;
+    }
+    var item = this._valueToItem(value);
+    if (item && item.hasAttribute('disabled')) return;
+    this._setFocusedItem(item);
+    Polymer.IronMultiSelectableBehaviorImpl.select.apply(this, arguments);
+  },
+  _resetTabindices: function() {
+    var selectedItem = this.multi ? this.selectedItems && this.selectedItems[0] : this.selectedItem;
+    this.items.forEach(function(item) {
+      item.setAttribute('tabindex', item === selectedItem ? '0' : '-1');
+    }, this);
+  },
+  _updateMultiselectable: function(multi) {
+    if (multi) {
+      this.setAttribute('aria-multiselectable', 'true');
+    } else {
+      this.removeAttribute('aria-multiselectable');
+    }
+  },
+  _focusWithKeyboardEvent: function(event) {
+    for (var i = 0, item; item = this.items[i]; i++) {
+      var attr = this.attrForItemTitle || 'textContent';
+      var title = item[attr] || item.getAttribute(attr);
+      if (!item.hasAttribute('disabled') && title && title.trim().charAt(0).toLowerCase() === String.fromCharCode(event.keyCode).toLowerCase()) {
+        this._setFocusedItem(item);
+        break;
+      }
+    }
+  },
+  _focusPrevious: function() {
+    var length = this.items.length;
+    var curFocusIndex = Number(this.indexOf(this.focusedItem));
+    for (var i = 1; i < length + 1; i++) {
+      var item = this.items[(curFocusIndex - i + length) % length];
+      if (!item.hasAttribute('disabled')) {
+        this._setFocusedItem(item);
         return;
-
-      keyboardEvent.preventDefault();
-      keyboardEvent.stopImmediatePropagation();
-      this._setPressed(true);
-    },
-
-    /**
-     * @param {!KeyboardEvent} event .
-     */
-    _spaceKeyUpHandler: function(event) {
-      var keyboardEvent = event.detail.keyboardEvent;
-      var target = Polymer.dom(keyboardEvent).localTarget;
-
-      // Ignore the event if this is coming from a focused light child, since that
-      // element will deal with it.
-      if (this.isLightDescendant(/** @type {Node} */(target)))
+      }
+    }
+  },
+  _focusNext: function() {
+    var length = this.items.length;
+    var curFocusIndex = Number(this.indexOf(this.focusedItem));
+    for (var i = 1; i < length + 1; i++) {
+      var item = this.items[(curFocusIndex + i) % length];
+      if (!item.hasAttribute('disabled')) {
+        this._setFocusedItem(item);
         return;
-
-      if (this.pressed) {
-        this._asyncClick();
-      }
-      this._setPressed(false);
-    },
-
-    // trigger click asynchronously, the asynchrony is useful to allow one
-    // event handler to unwind before triggering another event
-    _asyncClick: function() {
-      this.async(function() {
-        this.click();
-      }, 1);
-    },
-
-    // any of these changes are considered a change to button state
-
-    _pressedChanged: function(pressed) {
-      this._changedButtonState();
-    },
-
-    _ariaActiveAttributeChanged: function(value, oldValue) {
-      if (oldValue && oldValue != value && this.hasAttribute(oldValue)) {
-        this.removeAttribute(oldValue);
-      }
-    },
-
-    _activeChanged: function(active, ariaActiveAttribute) {
-      if (this.toggles) {
-        this.setAttribute(this.ariaActiveAttribute,
-                          active ? 'true' : 'false');
-      } else {
-        this.removeAttribute(this.ariaActiveAttribute);
-      }
-      this._changedButtonState();
-    },
-
-    _controlStateChanged: function() {
-      if (this.disabled) {
-        this._setPressed(false);
-      } else {
-        this._changedButtonState();
-      }
-    },
-
-    // provide hook for follow-on behaviors to react to button-state
-
-    _changedButtonState: function() {
-      if (this._buttonStateChanged) {
-        this._buttonStateChanged(); // abstract
-      }
-    }
-
-  };
-
-  /** @polymerBehavior */
-  Polymer.IronButtonState = [
-    Polymer.IronA11yKeysBehavior,
-    Polymer.IronButtonStateImpl
-  ];
-(function() {
-    var Utility = {
-      distance: function(x1, y1, x2, y2) {
-        var xDelta = (x1 - x2);
-        var yDelta = (y1 - y2);
-
-        return Math.sqrt(xDelta * xDelta + yDelta * yDelta);
-      },
-
-      now: window.performance && window.performance.now ?
-          window.performance.now.bind(window.performance) : Date.now
-    };
-
-    /**
-     * @param {HTMLElement} element
-     * @constructor
-     */
-    function ElementMetrics(element) {
-      this.element = element;
-      this.width = this.boundingRect.width;
-      this.height = this.boundingRect.height;
-
-      this.size = Math.max(this.width, this.height);
-    }
-
-    ElementMetrics.prototype = {
-      get boundingRect () {
-        return this.element.getBoundingClientRect();
-      },
-
-      furthestCornerDistanceFrom: function(x, y) {
-        var topLeft = Utility.distance(x, y, 0, 0);
-        var topRight = Utility.distance(x, y, this.width, 0);
-        var bottomLeft = Utility.distance(x, y, 0, this.height);
-        var bottomRight = Utility.distance(x, y, this.width, this.height);
-
-        return Math.max(topLeft, topRight, bottomLeft, bottomRight);
-      }
-    };
-
-    /**
-     * @param {HTMLElement} element
-     * @constructor
-     */
-    function Ripple(element) {
-      this.element = element;
-      this.color = window.getComputedStyle(element).color;
-
-      this.wave = document.createElement('div');
-      this.waveContainer = document.createElement('div');
-      this.wave.style.backgroundColor = this.color;
-      this.wave.classList.add('wave');
-      this.waveContainer.classList.add('wave-container');
-      Polymer.dom(this.waveContainer).appendChild(this.wave);
-
-      this.resetInteractionState();
-    }
-
-    Ripple.MAX_RADIUS = 300;
-
-    Ripple.prototype = {
-      get recenters() {
-        return this.element.recenters;
-      },
-
-      get center() {
-        return this.element.center;
-      },
-
-      get mouseDownElapsed() {
-        var elapsed;
-
-        if (!this.mouseDownStart) {
-          return 0;
-        }
-
-        elapsed = Utility.now() - this.mouseDownStart;
-
-        if (this.mouseUpStart) {
-          elapsed -= this.mouseUpElapsed;
-        }
-
-        return elapsed;
-      },
-
-      get mouseUpElapsed() {
-        return this.mouseUpStart ?
-          Utility.now () - this.mouseUpStart : 0;
-      },
-
-      get mouseDownElapsedSeconds() {
-        return this.mouseDownElapsed / 1000;
-      },
-
-      get mouseUpElapsedSeconds() {
-        return this.mouseUpElapsed / 1000;
-      },
-
-      get mouseInteractionSeconds() {
-        return this.mouseDownElapsedSeconds + this.mouseUpElapsedSeconds;
-      },
-
-      get initialOpacity() {
-        return this.element.initialOpacity;
-      },
-
-      get opacityDecayVelocity() {
-        return this.element.opacityDecayVelocity;
-      },
-
-      get radius() {
-        var width2 = this.containerMetrics.width * this.containerMetrics.width;
-        var height2 = this.containerMetrics.height * this.containerMetrics.height;
-        var waveRadius = Math.min(
-          Math.sqrt(width2 + height2),
-          Ripple.MAX_RADIUS
-        ) * 1.1 + 5;
-
-        var duration = 1.1 - 0.2 * (waveRadius / Ripple.MAX_RADIUS);
-        var timeNow = this.mouseInteractionSeconds / duration;
-        var size = waveRadius * (1 - Math.pow(80, -timeNow));
-
-        return Math.abs(size);
-      },
-
-      get opacity() {
-        if (!this.mouseUpStart) {
-          return this.initialOpacity;
-        }
-
-        return Math.max(
-          0,
-          this.initialOpacity - this.mouseUpElapsedSeconds * this.opacityDecayVelocity
-        );
-      },
-
-      get outerOpacity() {
-        // Linear increase in background opacity, capped at the opacity
-        // of the wavefront (waveOpacity).
-        var outerOpacity = this.mouseUpElapsedSeconds * 0.3;
-        var waveOpacity = this.opacity;
-
-        return Math.max(
-          0,
-          Math.min(outerOpacity, waveOpacity)
-        );
-      },
-
-      get isOpacityFullyDecayed() {
-        return this.opacity < 0.01 &&
-          this.radius >= Math.min(this.maxRadius, Ripple.MAX_RADIUS);
-      },
-
-      get isRestingAtMaxRadius() {
-        return this.opacity >= this.initialOpacity &&
-          this.radius >= Math.min(this.maxRadius, Ripple.MAX_RADIUS);
-      },
-
-      get isAnimationComplete() {
-        return this.mouseUpStart ?
-          this.isOpacityFullyDecayed : this.isRestingAtMaxRadius;
-      },
-
-      get translationFraction() {
-        return Math.min(
-          1,
-          this.radius / this.containerMetrics.size * 2 / Math.sqrt(2)
-        );
-      },
-
-      get xNow() {
-        if (this.xEnd) {
-          return this.xStart + this.translationFraction * (this.xEnd - this.xStart);
-        }
-
-        return this.xStart;
-      },
-
-      get yNow() {
-        if (this.yEnd) {
-          return this.yStart + this.translationFraction * (this.yEnd - this.yStart);
-        }
-
-        return this.yStart;
-      },
-
-      get isMouseDown() {
-        return this.mouseDownStart && !this.mouseUpStart;
-      },
-
-      resetInteractionState: function() {
-        this.maxRadius = 0;
-        this.mouseDownStart = 0;
-        this.mouseUpStart = 0;
-
-        this.xStart = 0;
-        this.yStart = 0;
-        this.xEnd = 0;
-        this.yEnd = 0;
-        this.slideDistance = 0;
-
-        this.containerMetrics = new ElementMetrics(this.element);
-      },
-
-      draw: function() {
-        var scale;
-        var translateString;
-        var dx;
-        var dy;
-
-        this.wave.style.opacity = this.opacity;
-
-        scale = this.radius / (this.containerMetrics.size / 2);
-        dx = this.xNow - (this.containerMetrics.width / 2);
-        dy = this.yNow - (this.containerMetrics.height / 2);
-
-
-        // 2d transform for safari because of border-radius and overflow:hidden clipping bug.
-        // https://bugs.webkit.org/show_bug.cgi?id=98538
-        this.waveContainer.style.webkitTransform = 'translate(' + dx + 'px, ' + dy + 'px)';
-        this.waveContainer.style.transform = 'translate3d(' + dx + 'px, ' + dy + 'px, 0)';
-        this.wave.style.webkitTransform = 'scale(' + scale + ',' + scale + ')';
-        this.wave.style.transform = 'scale3d(' + scale + ',' + scale + ',1)';
-      },
-
-      /** @param {Event=} event */
-      downAction: function(event) {
-        var xCenter = this.containerMetrics.width / 2;
-        var yCenter = this.containerMetrics.height / 2;
-
-        this.resetInteractionState();
-        this.mouseDownStart = Utility.now();
-
-        if (this.center) {
-          this.xStart = xCenter;
-          this.yStart = yCenter;
-          this.slideDistance = Utility.distance(
-            this.xStart, this.yStart, this.xEnd, this.yEnd
-          );
-        } else {
-          this.xStart = event ?
-              event.detail.x - this.containerMetrics.boundingRect.left :
-              this.containerMetrics.width / 2;
-          this.yStart = event ?
-              event.detail.y - this.containerMetrics.boundingRect.top :
-              this.containerMetrics.height / 2;
-        }
-
-        if (this.recenters) {
-          this.xEnd = xCenter;
-          this.yEnd = yCenter;
-          this.slideDistance = Utility.distance(
-            this.xStart, this.yStart, this.xEnd, this.yEnd
-          );
-        }
-
-        this.maxRadius = this.containerMetrics.furthestCornerDistanceFrom(
-          this.xStart,
-          this.yStart
-        );
-
-        this.waveContainer.style.top =
-          (this.containerMetrics.height - this.containerMetrics.size) / 2 + 'px';
-        this.waveContainer.style.left =
-          (this.containerMetrics.width - this.containerMetrics.size) / 2 + 'px';
-
-        this.waveContainer.style.width = this.containerMetrics.size + 'px';
-        this.waveContainer.style.height = this.containerMetrics.size + 'px';
-      },
-
-      /** @param {Event=} event */
-      upAction: function(event) {
-        if (!this.isMouseDown) {
-          return;
-        }
-
-        this.mouseUpStart = Utility.now();
-      },
-
-      remove: function() {
-        Polymer.dom(this.waveContainer.parentNode).removeChild(
-          this.waveContainer
-        );
-      }
-    };
-
-    Polymer({
-      is: 'paper-ripple',
-
-      behaviors: [
-        Polymer.IronA11yKeysBehavior
-      ],
-
-      properties: {
-        /**
-         * The initial opacity set on the wave.
-         *
-         * @attribute initialOpacity
-         * @type number
-         * @default 0.25
-         */
-        initialOpacity: {
-          type: Number,
-          value: 0.25
-        },
-
-        /**
-         * How fast (opacity per second) the wave fades out.
-         *
-         * @attribute opacityDecayVelocity
-         * @type number
-         * @default 0.8
-         */
-        opacityDecayVelocity: {
-          type: Number,
-          value: 0.8
-        },
-
-        /**
-         * If true, ripples will exhibit a gravitational pull towards
-         * the center of their container as they fade away.
-         *
-         * @attribute recenters
-         * @type boolean
-         * @default false
-         */
-        recenters: {
-          type: Boolean,
-          value: false
-        },
-
-        /**
-         * If true, ripples will center inside its container
-         *
-         * @attribute recenters
-         * @type boolean
-         * @default false
-         */
-        center: {
-          type: Boolean,
-          value: false
-        },
-
-        /**
-         * A list of the visual ripples.
-         *
-         * @attribute ripples
-         * @type Array
-         * @default []
-         */
-        ripples: {
-          type: Array,
-          value: function() {
-            return [];
-          }
-        },
-
-        /**
-         * True when there are visible ripples animating within the
-         * element.
-         */
-        animating: {
-          type: Boolean,
-          readOnly: true,
-          reflectToAttribute: true,
-          value: false
-        },
-
-        /**
-         * If true, the ripple will remain in the "down" state until `holdDown`
-         * is set to false again.
-         */
-        holdDown: {
-          type: Boolean,
-          value: false,
-          observer: '_holdDownChanged'
-        },
-
-        /**
-         * If true, the ripple will not generate a ripple effect
-         * via pointer interaction.
-         * Calling ripple's imperative api like `simulatedRipple` will
-         * still generate the ripple effect.
-         */
-        noink: {
-          type: Boolean,
-          value: false
-        },
-
-        _animating: {
-          type: Boolean
-        },
-
-        _boundAnimate: {
-          type: Function,
-          value: function() {
-            return this.animate.bind(this);
-          }
-        }
-      },
-
-      get target () {
-        return this.keyEventTarget;
-      },
-
-      keyBindings: {
-        'enter:keydown': '_onEnterKeydown',
-        'space:keydown': '_onSpaceKeydown',
-        'space:keyup': '_onSpaceKeyup'
-      },
-
-      attached: function() {
-        // Set up a11yKeysBehavior to listen to key events on the target,
-        // so that space and enter activate the ripple even if the target doesn't
-        // handle key events. The key handlers deal with `noink` themselves.
-        if (this.parentNode.nodeType == 11) { // DOCUMENT_FRAGMENT_NODE
-          this.keyEventTarget = Polymer.dom(this).getOwnerRoot().host;
-        } else {
-          this.keyEventTarget = this.parentNode;
-        }
-        var keyEventTarget = /** @type {!EventTarget} */ (this.keyEventTarget);
-        this.listen(keyEventTarget, 'up', 'uiUpAction');
-        this.listen(keyEventTarget, 'down', 'uiDownAction');
-      },
-
-      detached: function() {
-        this.unlisten(this.keyEventTarget, 'up', 'uiUpAction');
-        this.unlisten(this.keyEventTarget, 'down', 'uiDownAction');
-        this.keyEventTarget = null;
-      },
-
-      get shouldKeepAnimating () {
-        for (var index = 0; index < this.ripples.length; ++index) {
-          if (!this.ripples[index].isAnimationComplete) {
-            return true;
-          }
-        }
-
-        return false;
-      },
-
-      simulatedRipple: function() {
-        this.downAction(null);
-
-        // Please see polymer/polymer#1305
-        this.async(function() {
-          this.upAction();
-        }, 1);
-      },
-
-      /**
-       * Provokes a ripple down effect via a UI event,
-       * respecting the `noink` property.
-       * @param {Event=} event
-       */
-      uiDownAction: function(event) {
-        if (!this.noink) {
-          this.downAction(event);
-        }
-      },
-
-      /**
-       * Provokes a ripple down effect via a UI event,
-       * *not* respecting the `noink` property.
-       * @param {Event=} event
-       */
-      downAction: function(event) {
-        if (this.holdDown && this.ripples.length > 0) {
-          return;
-        }
-
-        var ripple = this.addRipple();
-
-        ripple.downAction(event);
-
-        if (!this._animating) {
-          this._animating = true;
-          this.animate();
-        }
-      },
-
-      /**
-       * Provokes a ripple up effect via a UI event,
-       * respecting the `noink` property.
-       * @param {Event=} event
-       */
-      uiUpAction: function(event) {
-        if (!this.noink) {
-          this.upAction(event);
-        }
-      },
-
-      /**
-       * Provokes a ripple up effect via a UI event,
-       * *not* respecting the `noink` property.
-       * @param {Event=} event
-       */
-      upAction: function(event) {
-        if (this.holdDown) {
-          return;
-        }
-
-        this.ripples.forEach(function(ripple) {
-          ripple.upAction(event);
-        });
-
-        this._animating = true;
-        this.animate();
-      },
-
-      onAnimationComplete: function() {
-        this._animating = false;
-        this.$.background.style.backgroundColor = null;
-        this.fire('transitionend');
-      },
-
-      addRipple: function() {
-        var ripple = new Ripple(this);
-
-        Polymer.dom(this.$.waves).appendChild(ripple.waveContainer);
-        this.$.background.style.backgroundColor = ripple.color;
-        this.ripples.push(ripple);
-
-        this._setAnimating(true);
-
-        return ripple;
-      },
-
-      removeRipple: function(ripple) {
-        var rippleIndex = this.ripples.indexOf(ripple);
-
-        if (rippleIndex < 0) {
-          return;
-        }
-
-        this.ripples.splice(rippleIndex, 1);
-
-        ripple.remove();
-
-        if (!this.ripples.length) {
-          this._setAnimating(false);
-        }
-      },
-
-      animate: function() {
-        if (!this._animating) {
-          return;
-        }
-        var index;
-        var ripple;
-
-        for (index = 0; index < this.ripples.length; ++index) {
-          ripple = this.ripples[index];
-
-          ripple.draw();
-
-          this.$.background.style.opacity = ripple.outerOpacity;
-
-          if (ripple.isOpacityFullyDecayed && !ripple.isRestingAtMaxRadius) {
-            this.removeRipple(ripple);
-          }
-        }
-
-        if (!this.shouldKeepAnimating && this.ripples.length === 0) {
-          this.onAnimationComplete();
-        } else {
-          window.requestAnimationFrame(this._boundAnimate);
-        }
-      },
-
-      _onEnterKeydown: function() {
-        this.uiDownAction();
-        this.async(this.uiUpAction, 1);
-      },
-
-      _onSpaceKeydown: function() {
-        this.uiDownAction();
-      },
-
-      _onSpaceKeyup: function() {
-        this.uiUpAction();
-      },
-
-      // note: holdDown does not respect noink since it can be a focus based
-      // effect.
-      _holdDownChanged: function(newVal, oldVal) {
-        if (oldVal === undefined) {
-          return;
-        }
-        if (newVal) {
-          this.downAction();
-        } else {
-          this.upAction();
-        }
-      }
-
-      /**
-      Fired when the animation finishes.
-      This is useful if you want to wait until
-      the ripple animation finishes to perform some action.
-
-      @event transitionend
-      @param {{node: Object}} detail Contains the animated node.
-      */
+      }
+    }
+  },
+  _applySelection: function(item, isSelected) {
+    if (isSelected) {
+      item.setAttribute('aria-selected', 'true');
+    } else {
+      item.removeAttribute('aria-selected');
+    }
+    Polymer.IronSelectableBehavior._applySelection.apply(this, arguments);
+  },
+  _focusedItemChanged: function(focusedItem, old) {
+    old && old.setAttribute('tabindex', '-1');
+    if (focusedItem) {
+      focusedItem.setAttribute('tabindex', '0');
+      focusedItem.focus();
+    }
+  },
+  _onIronItemsChanged: function(event) {
+    if (event.detail.addedNodes.length) {
+      this._resetTabindices();
+    }
+  },
+  _onShiftTabDown: function(event) {
+    var oldTabIndex = this.getAttribute('tabindex');
+    Polymer.IronMenuBehaviorImpl._shiftTabPressed = true;
+    this._setFocusedItem(null);
+    this.setAttribute('tabindex', '-1');
+    this.async(function() {
+      this.setAttribute('tabindex', oldTabIndex);
+      Polymer.IronMenuBehaviorImpl._shiftTabPressed = false;
+    }, 1);
+  },
+  _onFocus: function(event) {
+    if (Polymer.IronMenuBehaviorImpl._shiftTabPressed) {
+      return;
+    }
+    var rootTarget = Polymer.dom(event).rootTarget;
+    if (rootTarget !== this && typeof rootTarget.tabIndex !== "undefined" && !this.isLightDescendant(rootTarget)) {
+      return;
+    }
+    this._defaultFocusAsync = this.async(function() {
+      var selectedItem = this.multi ? this.selectedItems && this.selectedItems[0] : this.selectedItem;
+      this._setFocusedItem(null);
+      if (selectedItem) {
+        this._setFocusedItem(selectedItem);
+      } else if (this.items[0]) {
+        this._focusNext();
+      }
     });
-  })();
-/**
-   * `Polymer.PaperRippleBehavior` dynamically implements a ripple
-   * when the element has focus via pointer or keyboard.
-   *
-   * NOTE: This behavior is intended to be used in conjunction with and after
-   * `Polymer.IronButtonState` and `Polymer.IronControlState`.
-   *
-   * @polymerBehavior Polymer.PaperRippleBehavior
-   */
-  Polymer.PaperRippleBehavior = {
-    properties: {
-      /**
-       * If true, the element will not produce a ripple effect when interacted
-       * with via the pointer.
-       */
-      noink: {
-        type: Boolean,
-        observer: '_noinkChanged'
-      },
-
-      /**
-       * @type {Element|undefined}
-       */
-      _rippleContainer: {
-        type: Object,
-      }
-    },
-
-    /**
-     * Ensures a `<paper-ripple>` element is available when the element is
-     * focused.
-     */
-    _buttonStateChanged: function() {
-      if (this.focused) {
-        this.ensureRipple();
-      }
-    },
-
-    /**
-     * In addition to the functionality provided in `IronButtonState`, ensures
-     * a ripple effect is created when the element is in a `pressed` state.
-     */
-    _downHandler: function(event) {
-      Polymer.IronButtonStateImpl._downHandler.call(this, event);
-      if (this.pressed) {
-        this.ensureRipple(event);
-      }
-    },
-
-    /**
-     * Ensures this element contains a ripple effect. For startup efficiency
-     * the ripple effect is dynamically on demand when needed.
-     * @param {!Event=} optTriggeringEvent (optional) event that triggered the
-     * ripple.
-     */
-    ensureRipple: function(optTriggeringEvent) {
-      if (!this.hasRipple()) {
-        this._ripple = this._createRipple();
-        this._ripple.noink = this.noink;
-        var rippleContainer = this._rippleContainer || this.root;
-        if (rippleContainer) {
-          Polymer.dom(rippleContainer).appendChild(this._ripple);
-        }
-        if (optTriggeringEvent) {
-          // Check if the event happened inside of the ripple container
-          // Fall back to host instead of the root because distributed text
-          // nodes are not valid event targets
-          var domContainer = Polymer.dom(this._rippleContainer || this);
-          var target = Polymer.dom(optTriggeringEvent).rootTarget;
-          if (domContainer.deepContains( /** @type {Node} */(target))) {
-            this._ripple.uiDownAction(optTriggeringEvent);
-          }
-        }
-      }
-    },
-
-    /**
-     * Returns the `<paper-ripple>` element used by this element to create
-     * ripple effects. The element's ripple is created on demand, when
-     * necessary, and calling this method will force the
-     * ripple to be created.
-     */
-    getRipple: function() {
-      this.ensureRipple();
-      return this._ripple;
-    },
-
-    /**
-     * Returns true if this element currently contains a ripple effect.
-     * @return {boolean}
-     */
-    hasRipple: function() {
-      return Boolean(this._ripple);
-    },
-
-    /**
-     * Create the element's ripple effect via creating a `<paper-ripple>`.
-     * Override this method to customize the ripple element.
-     * @return {!PaperRippleElement} Returns a `<paper-ripple>` element.
-     */
-    _createRipple: function() {
-      return /** @type {!PaperRippleElement} */ (
-          document.createElement('paper-ripple'));
-    },
-
-    _noinkChanged: function(noink) {
-      if (this.hasRipple()) {
-        this._ripple.noink = noink;
-      }
-    }
-  };
-/** @polymerBehavior Polymer.PaperButtonBehavior */
-  Polymer.PaperButtonBehaviorImpl = {
-    properties: {
-      /**
-       * The z-depth of this element, from 0-5. Setting to 0 will remove the
-       * shadow, and each increasing number greater than 0 will be "deeper"
-       * than the last.
-       *
-       * @attribute elevation
-       * @type number
-       * @default 1
-       */
-      elevation: {
-        type: Number,
-        reflectToAttribute: true,
-        readOnly: true
-      }
-    },
-
-    observers: [
-      '_calculateElevation(focused, disabled, active, pressed, receivedFocusFromKeyboard)',
-      '_computeKeyboardClass(receivedFocusFromKeyboard)'
-    ],
-
-    hostAttributes: {
-      role: 'button',
-      tabindex: '0',
-      animated: true
-    },
-
-    _calculateElevation: function() {
-      var e = 1;
-      if (this.disabled) {
-        e = 0;
-      } else if (this.active || this.pressed) {
-        e = 4;
-      } else if (this.receivedFocusFromKeyboard) {
-        e = 3;
-      }
-      this._setElevation(e);
-    },
-
-    _computeKeyboardClass: function(receivedFocusFromKeyboard) {
-      this.toggleClass('keyboard-focus', receivedFocusFromKeyboard);
-    },
-
-    /**
-     * In addition to `IronButtonState` behavior, when space key goes down,
-     * create a ripple down effect.
-     *
-     * @param {!KeyboardEvent} event .
-     */
-    _spaceKeyDownHandler: function(event) {
-      Polymer.IronButtonStateImpl._spaceKeyDownHandler.call(this, event);
-      // Ensure that there is at most one ripple when the space key is held down.
-      if (this.hasRipple() && this.getRipple().ripples.length < 1) {
-        this._ripple.uiDownAction();
-      }
-    },
-
-    /**
-     * In addition to `IronButtonState` behavior, when space key goes up,
-     * create a ripple up effect.
-     *
-     * @param {!KeyboardEvent} event .
-     */
-    _spaceKeyUpHandler: function(event) {
-      Polymer.IronButtonStateImpl._spaceKeyUpHandler.call(this, event);
-      if (this.hasRipple()) {
-        this._ripple.uiUpAction();
-      }
-    }
-  };
-
-  /** @polymerBehavior */
-  Polymer.PaperButtonBehavior = [
-    Polymer.IronButtonState,
-    Polymer.IronControlState,
-    Polymer.PaperRippleBehavior,
-    Polymer.PaperButtonBehaviorImpl
-  ];
+  },
+  _onUpKey: function(event) {
+    this._focusPrevious();
+    event.detail.keyboardEvent.preventDefault();
+  },
+  _onDownKey: function(event) {
+    this._focusNext();
+    event.detail.keyboardEvent.preventDefault();
+  },
+  _onEscKey: function(event) {
+    this.focusedItem.blur();
+  },
+  _onKeydown: function(event) {
+    if (!this.keyboardEventMatchesKeys(event, 'up down esc')) {
+      this._focusWithKeyboardEvent(event);
+    }
+    event.stopPropagation();
+  },
+  _activateHandler: function(event) {
+    Polymer.IronSelectableBehavior._activateHandler.call(this, event);
+    event.stopPropagation();
+  }
+};
+
+Polymer.IronMenuBehaviorImpl._shiftTabPressed = false;
+
+Polymer.IronMenuBehavior = [ Polymer.IronMultiSelectableBehavior, Polymer.IronA11yKeysBehavior, Polymer.IronMenuBehaviorImpl ];
+
+Polymer.IronMenubarBehaviorImpl = {
+  hostAttributes: {
+    role: 'menubar'
+  },
+  keyBindings: {
+    left: '_onLeftKey',
+    right: '_onRightKey'
+  },
+  _onUpKey: function(event) {
+    this.focusedItem.click();
+    event.detail.keyboardEvent.preventDefault();
+  },
+  _onDownKey: function(event) {
+    this.focusedItem.click();
+    event.detail.keyboardEvent.preventDefault();
+  },
+  get _isRTL() {
+    return window.getComputedStyle(this)['direction'] === 'rtl';
+  },
+  _onLeftKey: function(event) {
+    if (this._isRTL) {
+      this._focusNext();
+    } else {
+      this._focusPrevious();
+    }
+    event.detail.keyboardEvent.preventDefault();
+  },
+  _onRightKey: function(event) {
+    if (this._isRTL) {
+      this._focusPrevious();
+    } else {
+      this._focusNext();
+    }
+    event.detail.keyboardEvent.preventDefault();
+  },
+  _onKeydown: function(event) {
+    if (this.keyboardEventMatchesKeys(event, 'up down left right esc')) {
+      return;
+    }
+    this._focusWithKeyboardEvent(event);
+  }
+};
+
+Polymer.IronMenubarBehavior = [ Polymer.IronMenuBehavior, Polymer.IronMenubarBehaviorImpl ];
+
 Polymer({
-      is: 'paper-button',
-
-      behaviors: [
-        Polymer.PaperButtonBehavior
-      ],
-
-      properties: {
-        /**
-         * If true, the button should be styled with a shadow.
-         */
-        raised: {
-          type: Boolean,
-          reflectToAttribute: true,
-          value: false,
-          observer: '_calculateElevation'
-        }
-      },
-
-      _calculateElevation: function() {
-        if (!this.raised) {
-          this._setElevation(0);
-        } else {
-          Polymer.PaperButtonBehaviorImpl._calculateElevation.apply(this);
-        }
-      }
-
-      /**
-      Fired when the animation finishes.
-      This is useful if you want to wait until
-      the ripple animation finishes to perform some action.
-
-      @event transitionend
-      Event param: {{node: Object}} detail Contains the animated node.
-      */
+  is: 'iron-iconset-svg',
+  properties: {
+    name: {
+      type: String,
+      observer: '_nameChanged'
+    },
+    size: {
+      type: Number,
+      value: 24
+    }
+  },
+  attached: function() {
+    this.style.display = 'none';
+  },
+  getIconNames: function() {
+    this._icons = this._createIconMap();
+    return Object.keys(this._icons).map(function(n) {
+      return this.name + ':' + n;
+    }, this);
+  },
+  applyIcon: function(element, iconName) {
+    element = element.root || element;
+    this.removeIcon(element);
+    var svg = this._cloneIcon(iconName);
+    if (svg) {
+      var pde = Polymer.dom(element);
+      pde.insertBefore(svg, pde.childNodes[0]);
+      return element._svgIcon = svg;
+    }
+    return null;
+  },
+  removeIcon: function(element) {
+    if (element._svgIcon) {
+      Polymer.dom(element).removeChild(element._svgIcon);
+      element._svgIcon = null;
+    }
+  },
+  _nameChanged: function() {
+    new Polymer.IronMeta({
+      type: 'iconset',
+      key: this.name,
+      value: this
     });
-(function() {
-
-    // monostate data
-    var metaDatas = {};
-    var metaArrays = {};
-    var singleton = null;
-
-    Polymer.IronMeta = Polymer({
-
-      is: 'iron-meta',
-
-      properties: {
-
-        /**
-         * The type of meta-data.  All meta-data of the same type is stored
-         * together.
-         */
-        type: {
-          type: String,
-          value: 'default',
-          observer: '_typeChanged'
-        },
-
-        /**
-         * The key used to store `value` under the `type` namespace.
-         */
-        key: {
-          type: String,
-          observer: '_keyChanged'
-        },
-
-        /**
-         * The meta-data to store or retrieve.
-         */
-        value: {
-          type: Object,
-          notify: true,
-          observer: '_valueChanged'
-        },
-
-        /**
-         * If true, `value` is set to the iron-meta instance itself.
-         */
-         self: {
-          type: Boolean,
-          observer: '_selfChanged'
-        },
-
-        /**
-         * Array of all meta-data values for the given type.
-         */
-        list: {
-          type: Array,
-          notify: true
-        }
-
-      },
-
-      hostAttributes: {
-        hidden: true
-      },
-
-      /**
-       * Only runs if someone invokes the factory/constructor directly
-       * e.g. `new Polymer.IronMeta()`
-       *
-       * @param {{type: (string|undefined), key: (string|undefined), value}=} config
-       */
-      factoryImpl: function(config) {
-        if (config) {
-          for (var n in config) {
-            switch(n) {
-              case 'type':
-              case 'key':
-              case 'value':
-                this[n] = config[n];
-                break;
-            }
-          }
-        }
-      },
-
-      created: function() {
-        // TODO(sjmiles): good for debugging?
-        this._metaDatas = metaDatas;
-        this._metaArrays = metaArrays;
-      },
-
-      _keyChanged: function(key, old) {
-        this._resetRegistration(old);
-      },
-
-      _valueChanged: function(value) {
-        this._resetRegistration(this.key);
-      },
-
-      _selfChanged: function(self) {
-        if (self) {
-          this.value = this;
-        }
-      },
-
-      _typeChanged: function(type) {
-        this._unregisterKey(this.key);
-        if (!metaDatas[type]) {
-          metaDatas[type] = {};
-        }
-        this._metaData = metaDatas[type];
-        if (!metaArrays[type]) {
-          metaArrays[type] = [];
-        }
-        this.list = metaArrays[type];
-        this._registerKeyValue(this.key, this.value);
-      },
-
-      /**
-       * Retrieves meta data value by key.
-       *
-       * @method byKey
-       * @param {string} key The key of the meta-data to be returned.
-       * @return {*}
-       */
-      byKey: function(key) {
-        return this._metaData && this._metaData[key];
-      },
-
-      _resetRegistration: function(oldKey) {
-        this._unregisterKey(oldKey);
-        this._registerKeyValue(this.key, this.value);
-      },
-
-      _unregisterKey: function(key) {
-        this._unregister(key, this._metaData, this.list);
-      },
-
-      _registerKeyValue: function(key, value) {
-        this._register(key, value, this._metaData, this.list);
-      },
-
-      _register: function(key, value, data, list) {
-        if (key && data && value !== undefined) {
-          data[key] = value;
-          list.push(value);
-        }
-      },
-
-      _unregister: function(key, data, list) {
-        if (key && data) {
-          if (key in data) {
-            var value = data[key];
-            delete data[key];
-            this.arrayDelete(list, value);
-          }
-        }
-      }
-
+    this.async(function() {
+      this.fire('iron-iconset-added', this, {
+        node: window
+      });
     });
-
-    Polymer.IronMeta.getIronMeta = function getIronMeta() {
-       if (singleton === null) {
-         singleton = new Polymer.IronMeta();
-       }
-       return singleton;
-     };
-
-    /**
-    `iron-meta-query` can be used to access infomation stored in `iron-meta`.
-
-    Examples:
-
-    If I create an instance like this:
-
-        <iron-meta key="info" value="foo/bar"></iron-meta>
-
-    Note that value="foo/bar" is the metadata I've defined. I could define more
-    attributes or use child nodes to define additional metadata.
-
-    Now I can access that element (and it's metadata) from any `iron-meta-query` instance:
-
-         var value = new Polymer.IronMetaQuery({key: 'info'}).value;
-
-    @group Polymer Iron Elements
-    @element iron-meta-query
-    */
-    Polymer.IronMetaQuery = Polymer({
-
-      is: 'iron-meta-query',
-
-      properties: {
-
-        /**
-         * The type of meta-data.  All meta-data of the same type is stored
-         * together.
-         */
-        type: {
-          type: String,
-          value: 'default',
-          observer: '_typeChanged'
-        },
-
-        /**
-         * Specifies a key to use for retrieving `value` from the `type`
-         * namespace.
-         */
-        key: {
-          type: String,
-          observer: '_keyChanged'
-        },
-
-        /**
-         * The meta-data to store or retrieve.
-         */
-        value: {
-          type: Object,
-          notify: true,
-          readOnly: true
-        },
-
-        /**
-         * Array of all meta-data values for the given type.
-         */
-        list: {
-          type: Array,
-          notify: true
-        }
-
-      },
-
-      /**
-       * Actually a factory method, not a true constructor. Only runs if
-       * someone invokes it directly (via `new Polymer.IronMeta()`);
-       *
-       * @param {{type: (string|undefined), key: (string|undefined)}=} config
-       */
-      factoryImpl: function(config) {
-        if (config) {
-          for (var n in config) {
-            switch(n) {
-              case 'type':
-              case 'key':
-                this[n] = config[n];
-                break;
-            }
-          }
-        }
-      },
-
-      created: function() {
-        // TODO(sjmiles): good for debugging?
-        this._metaDatas = metaDatas;
-        this._metaArrays = metaArrays;
-      },
-
-      _keyChanged: function(key) {
-        this._setValue(this._metaData && this._metaData[key]);
-      },
-
-      _typeChanged: function(type) {
-        this._metaData = metaDatas[type];
-        this.list = metaArrays[type];
-        if (this.key) {
-          this._keyChanged(this.key);
-        }
-      },
-
-      /**
-       * Retrieves meta data value by key.
-       * @param {string} key The key of the meta-data to be returned.
-       * @return {*}
-       */
-      byKey: function(key) {
-        return this._metaData && this._metaData[key];
-      }
-
+  },
+  _createIconMap: function() {
+    var icons = Object.create(null);
+    Polymer.dom(this).querySelectorAll('[id]').forEach(function(icon) {
+      icons[icon.id] = icon;
     });
-
-  })();
+    return icons;
+  },
+  _cloneIcon: function(id) {
+    this._icons = this._icons || this._createIconMap();
+    return this._prepareSvgClone(this._icons[id], this.size);
+  },
+  _prepareSvgClone: function(sourceSvg, size) {
+    if (sourceSvg) {
+      var content = sourceSvg.cloneNode(true), svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg'), viewBox = content.getAttribute('viewBox') || '0 0 ' + size + ' ' + size;
+      svg.setAttribute('viewBox', viewBox);
+      svg.setAttribute('preserveAspectRatio', 'xMidYMid meet');
+      svg.style.cssText = 'pointer-events: none; display: block; width: 100%; height: 100%;';
+      svg.appendChild(content).removeAttribute('id');
+      return svg;
+    }
+    return null;
+  }
+});
+
 Polymer({
-
-      is: 'iron-icon',
-
-      properties: {
-
-        /**
-         * The name of the icon to use. The name should be of the form:
-         * `iconset_name:icon_name`.
-         */
-        icon: {
-          type: String,
-          observer: '_iconChanged'
-        },
-
-        /**
-         * The name of the theme to used, if one is specified by the
-         * iconset.
-         */
-        theme: {
-          type: String,
-          observer: '_updateIcon'
-        },
-
-        /**
-         * If using iron-icon without an iconset, you can set the src to be
-         * the URL of an individual icon image file. Note that this will take
-         * precedence over a given icon attribute.
-         */
-        src: {
-          type: String,
-          observer: '_srcChanged'
-        },
-
-        /**
-         * @type {!Polymer.IronMeta}
-         */
-        _meta: {
-          value: Polymer.Base.create('iron-meta', {type: 'iconset'}),
-          observer: '_updateIcon'
-        }
-
-      },
-
-      _DEFAULT_ICONSET: 'icons',
-
-      _iconChanged: function(icon) {
-        var parts = (icon || '').split(':');
-        this._iconName = parts.pop();
-        this._iconsetName = parts.pop() || this._DEFAULT_ICONSET;
-        this._updateIcon();
-      },
-
-      _srcChanged: function(src) {
-        this._updateIcon();
-      },
-
-      _usesIconset: function() {
-        return this.icon || !this.src;
-      },
-
-      /** @suppress {visibility} */
-      _updateIcon: function() {
-        if (this._usesIconset()) {
-          if (this._img && this._img.parentNode) {
-            Polymer.dom(this.root).removeChild(this._img);
-          }
-          if (this._iconName === "") {
-            if (this._iconset) {
-              this._iconset.removeIcon(this);
-            }
-          } else if (this._iconsetName && this._meta) {
-            this._iconset = /** @type {?Polymer.Iconset} */ (
-              this._meta.byKey(this._iconsetName));
-            if (this._iconset) {
-              this._iconset.applyIcon(this, this._iconName, this.theme);
-              this.unlisten(window, 'iron-iconset-added', '_updateIcon');
-            } else {
-              this.listen(window, 'iron-iconset-added', '_updateIcon');
-            }
-          }
-        } else {
-          if (this._iconset) {
-            this._iconset.removeIcon(this);
-          }
-          if (!this._img) {
-            this._img = document.createElement('img');
-            this._img.style.width = '100%';
-            this._img.style.height = '100%';
-            this._img.draggable = false;
-          }
-          this._img.src = this.src;
-          Polymer.dom(this.root).appendChild(this._img);
-        }
-      }
-
+  is: 'paper-tabs',
+  behaviors: [ Polymer.IronResizableBehavior, Polymer.IronMenubarBehavior ],
+  properties: {
+    noink: {
+      type: Boolean,
+      value: false,
+      observer: '_noinkChanged'
+    },
+    noBar: {
+      type: Boolean,
+      value: false
+    },
+    noSlide: {
+      type: Boolean,
+      value: false
+    },
+    scrollable: {
+      type: Boolean,
+      value: false
+    },
+    fitContainer: {
+      type: Boolean,
+      value: false
+    },
+    disableDrag: {
+      type: Boolean,
+      value: false
+    },
+    hideScrollButtons: {
+      type: Boolean,
+      value: false
+    },
+    alignBottom: {
+      type: Boolean,
+      value: false
+    },
+    selectable: {
+      type: String,
+      value: 'paper-tab'
+    },
+    autoselect: {
+      type: Boolean,
+      value: false
+    },
+    autoselectDelay: {
+      type: Number,
+      value: 0
+    },
+    _step: {
+      type: Number,
+      value: 10
+    },
+    _holdDelay: {
+      type: Number,
+      value: 1
+    },
+    _leftHidden: {
+      type: Boolean,
+      value: false
+    },
+    _rightHidden: {
+      type: Boolean,
+      value: false
+    },
+    _previousTab: {
+      type: Object
+    }
+  },
+  hostAttributes: {
+    role: 'tablist'
+  },
+  listeners: {
+    'iron-resize': '_onTabSizingChanged',
+    'iron-items-changed': '_onTabSizingChanged',
+    'iron-select': '_onIronSelect',
+    'iron-deselect': '_onIronDeselect'
+  },
+  keyBindings: {
+    'left:keyup right:keyup': '_onArrowKeyup'
+  },
+  created: function() {
+    this._holdJob = null;
+    this._pendingActivationItem = undefined;
+    this._pendingActivationTimeout = undefined;
+    this._bindDelayedActivationHandler = this._delayedActivationHandler.bind(this);
+    this.addEventListener('blur', this._onBlurCapture.bind(this), true);
+  },
+  ready: function() {
+    this.setScrollDirection('y', this.$.tabsContainer);
+  },
+  detached: function() {
+    this._cancelPendingActivation();
+  },
+  _noinkChanged: function(noink) {
+    var childTabs = Polymer.dom(this).querySelectorAll('paper-tab');
+    childTabs.forEach(noink ? this._setNoinkAttribute : this._removeNoinkAttribute);
+  },
+  _setNoinkAttribute: function(element) {
+    element.setAttribute('noink', '');
+  },
+  _removeNoinkAttribute: function(element) {
+    element.removeAttribute('noink');
+  },
+  _computeScrollButtonClass: function(hideThisButton, scrollable, hideScrollButtons) {
+    if (!scrollable || hideScrollButtons) {
+      return 'hidden';
+    }
+    if (hideThisButton) {
+      return 'not-visible';
+    }
+    return '';
+  },
+  _computeTabsContentClass: function(scrollable, fitContainer) {
+    return scrollable ? 'scrollable' + (fitContainer ? ' fit-container' : '') : ' fit-container';
+  },
+  _computeSelectionBarClass: function(noBar, alignBottom) {
+    if (noBar) {
+      return 'hidden';
+    } else if (alignBottom) {
+      return 'align-bottom';
+    }
+    return '';
+  },
+  _onTabSizingChanged: function() {
+    this.debounce('_onTabSizingChanged', function() {
+      this._scroll();
+      this._tabChanged(this.selectedItem);
+    }, 10);
+  },
+  _onIronSelect: function(event) {
+    this._tabChanged(event.detail.item, this._previousTab);
+    this._previousTab = event.detail.item;
+    this.cancelDebouncer('tab-changed');
+  },
+  _onIronDeselect: function(event) {
+    this.debounce('tab-changed', function() {
+      this._tabChanged(null, this._previousTab);
+      this._previousTab = null;
+    }, 1);
+  },
+  _activateHandler: function() {
+    this._cancelPendingActivation();
+    Polymer.IronMenuBehaviorImpl._activateHandler.apply(this, arguments);
+  },
+  _scheduleActivation: function(item, delay) {
+    this._pendingActivationItem = item;
+    this._pendingActivationTimeout = this.async(this._bindDelayedActivationHandler, delay);
+  },
+  _delayedActivationHandler: function() {
+    var item = this._pendingActivationItem;
+    this._pendingActivationItem = undefined;
+    this._pendingActivationTimeout = undefined;
+    item.fire(this.activateEvent, null, {
+      bubbles: true,
+      cancelable: true
     });
-/**
-   * `Polymer.PaperInkyFocusBehavior` implements a ripple when the element has keyboard focus.
-   *
-   * @polymerBehavior Polymer.PaperInkyFocusBehavior
-   */
-  Polymer.PaperInkyFocusBehaviorImpl = {
-    observers: [
-      '_focusedChanged(receivedFocusFromKeyboard)'
-    ],
-
-    _focusedChanged: function(receivedFocusFromKeyboard) {
-      if (receivedFocusFromKeyboard) {
-        this.ensureRipple();
-      }
-      if (this.hasRipple()) {
-        this._ripple.holdDown = receivedFocusFromKeyboard;
-      }
-    },
-
-    _createRipple: function() {
-      var ripple = Polymer.PaperRippleBehavior._createRipple();
-      ripple.id = 'ink';
-      ripple.setAttribute('center', '');
-      ripple.classList.add('circle');
-      return ripple;
-    }
-  };
-
-  /** @polymerBehavior Polymer.PaperInkyFocusBehavior */
-  Polymer.PaperInkyFocusBehavior = [
-    Polymer.IronButtonState,
-    Polymer.IronControlState,
-    Polymer.PaperRippleBehavior,
-    Polymer.PaperInkyFocusBehaviorImpl
-  ];
-Polymer({
-      is: 'paper-icon-button',
-
-      hostAttributes: {
-        role: 'button',
-        tabindex: '0'
-      },
-
-      behaviors: [
-        Polymer.PaperInkyFocusBehavior
-      ],
-
-      properties: {
-        /**
-         * The URL of an image for the icon. If the src property is specified,
-         * the icon property should not be.
-         */
-        src: {
-          type: String
-        },
-
-        /**
-         * Specifies the icon name or index in the set of icons available in
-         * the icon's icon set. If the icon property is specified,
-         * the src property should not be.
-         */
-        icon: {
-          type: String
-        },
-
-        /**
-         * Specifies the alternate text for the button, for accessibility.
-         */
-        alt: {
-          type: String,
-          observer: "_altChanged"
-        }
-      },
-
-      _altChanged: function(newValue, oldValue) {
-        var label = this.getAttribute('aria-label');
-
-        // Don't stomp over a user-set aria-label.
-        if (!label || oldValue == label) {
-          this.setAttribute('aria-label', newValue);
-        }
-      }
-    });
-Polymer({
-      is: 'paper-tab',
-
-      behaviors: [
-        Polymer.IronControlState,
-        Polymer.IronButtonState,
-        Polymer.PaperRippleBehavior
-      ],
-
-      properties: {
-
-        /**
-         * If true, the tab will forward keyboard clicks (enter/space) to
-         * the first anchor element found in its descendants
-         */
-        link: {
-          type: Boolean,
-          value: false,
-          reflectToAttribute: true
-        }
-
-      },
-
-      hostAttributes: {
-        role: 'tab'
-      },
-
-      listeners: {
-        down: '_updateNoink',
-        tap: '_onTap'
-      },
-
-      attached: function() {
-        this._updateNoink();
-      },
-
-      get _parentNoink () {
-        var parent = Polymer.dom(this).parentNode;
-        return !!parent && !!parent.noink;
-      },
-
-      _updateNoink: function() {
-        this.noink = !!this.noink || !!this._parentNoink;
-      },
-
-      _onTap: function(event) {
-        if (this.link) {
-          var anchor = this.queryEffectiveChildren('a');
-
-          if (!anchor) {
-            return;
-          }
-
-          // Don't get stuck in a loop delegating
-          // the listener from the child anchor
-          if (event.target === anchor) {
-            return;
-          }
-
-          anchor.click();
-        }
-      }
-
-    });
-/** @polymerBehavior Polymer.IronMultiSelectableBehavior */
-  Polymer.IronMultiSelectableBehaviorImpl = {
-    properties: {
-
-      /**
-       * If true, multiple selections are allowed.
-       */
-      multi: {
-        type: Boolean,
-        value: false,
-        observer: 'multiChanged'
-      },
-
-      /**
-       * Gets or sets the selected elements. This is used instead of `selected` when `multi`
-       * is true.
-       */
-      selectedValues: {
-        type: Array,
-        notify: true
-      },
-
-      /**
-       * Returns an array of currently selected items.
-       */
-      selectedItems: {
-        type: Array,
-        readOnly: true,
-        notify: true
-      },
-
-    },
-
-    observers: [
-      '_updateSelected(selectedValues.splices)'
-    ],
-
-    /**
-     * Selects the given value. If the `multi` property is true, then the selected state of the
-     * `value` will be toggled; otherwise the `value` will be selected.
-     *
-     * @method select
-     * @param {string|number} value the value to select.
-     */
-    select: function(value) {
-      if (this.multi) {
-        if (this.selectedValues) {
-          this._toggleSelected(value);
-        } else {
-          this.selectedValues = [value];
-        }
-      } else {
-        this.selected = value;
-      }
-    },
-
-    multiChanged: function(multi) {
-      this._selection.multi = multi;
-    },
-
-    get _shouldUpdateSelection() {
-      return this.selected != null ||
-        (this.selectedValues != null && this.selectedValues.length);
-    },
-
-    _updateAttrForSelected: function() {
-      if (!this.multi) {
-        Polymer.IronSelectableBehavior._updateAttrForSelected.apply(this);
-      } else if (this._shouldUpdateSelection) {
-        this.selectedValues = this.selectedItems.map(function(selectedItem) {
-          return this._indexToValue(this.indexOf(selectedItem));
-        }, this).filter(function(unfilteredValue) {
-          return unfilteredValue != null;
-        }, this);
-      }
-    },
-
-    _updateSelected: function() {
-      if (this.multi) {
-        this._selectMulti(this.selectedValues);
-      } else {
-        this._selectSelected(this.selected);
-      }
-    },
-
-    _selectMulti: function(values) {
-      if (values) {
-        var selectedItems = this._valuesToItems(values);
-        // clear all but the current selected items
-        this._selection.clear(selectedItems);
-        // select only those not selected yet
-        for (var i = 0; i < selectedItems.length; i++) {
-          this._selection.setItemSelected(selectedItems[i], true);
-        }
-        // Check for items, since this array is populated only when attached
-        if (this.fallbackSelection && this.items.length && !this._selection.get().length) {
-          var fallback = this._valueToItem(this.fallbackSelection);
-          if (fallback) {
-            this.selectedValues = [this.fallbackSelection];
-          }
-        }
-      } else {
-        this._selection.clear();
-      }
-    },
-
-    _selectionChange: function() {
-      var s = this._selection.get();
-      if (this.multi) {
-        this._setSelectedItems(s);
-      } else {
-        this._setSelectedItems([s]);
-        this._setSelectedItem(s);
-      }
-    },
-
-    _toggleSelected: function(value) {
-      var i = this.selectedValues.indexOf(value);
-      var unselected = i < 0;
-      if (unselected) {
-        this.push('selectedValues',value);
-      } else {
-        this.splice('selectedValues',i,1);
-      }
-    },
-
-    _valuesToItems: function(values) {
-      return (values == null) ? null : values.map(function(value) {
-        return this._valueToItem(value);
-      }, this);
-    }
-  };
-
-  /** @polymerBehavior */
-  Polymer.IronMultiSelectableBehavior = [
-    Polymer.IronSelectableBehavior,
-    Polymer.IronMultiSelectableBehaviorImpl
-  ];
-/**
-   * `Polymer.IronMenuBehavior` implements accessible menu behavior.
-   *
-   * @demo demo/index.html
-   * @polymerBehavior Polymer.IronMenuBehavior
-   */
-  Polymer.IronMenuBehaviorImpl = {
-
-    properties: {
-
-      /**
-       * Returns the currently focused item.
-       * @type {?Object}
-       */
-      focusedItem: {
-        observer: '_focusedItemChanged',
-        readOnly: true,
-        type: Object
-      },
-
-      /**
-       * The attribute to use on menu items to look up the item title. Typing the first
-       * letter of an item when the menu is open focuses that item. If unset, `textContent`
-       * will be used.
-       */
-      attrForItemTitle: {
-        type: String
-      }
-    },
-
-    hostAttributes: {
-      'role': 'menu',
-      'tabindex': '0'
-    },
-
-    observers: [
-      '_updateMultiselectable(multi)'
-    ],
-
-    listeners: {
-      'focus': '_onFocus',
-      'keydown': '_onKeydown',
-      'iron-items-changed': '_onIronItemsChanged'
-    },
-
-    keyBindings: {
-      'up': '_onUpKey',
-      'down': '_onDownKey',
-      'esc': '_onEscKey',
-      'shift+tab:keydown': '_onShiftTabDown'
-    },
-
-    attached: function() {
-      this._resetTabindices();
-    },
-
-    /**
-     * Selects the given value. If the `multi` property is true, then the selected state of the
-     * `value` will be toggled; otherwise the `value` will be selected.
-     *
-     * @param {string|number} value the value to select.
-     */
-    select: function(value) {
-      // Cancel automatically focusing a default item if the menu received focus
-      // through a user action selecting a particular item.
+  },
+  _cancelPendingActivation: function() {
+    if (this._pendingActivationTimeout !== undefined) {
+      this.cancelAsync(this._pendingActivationTimeout);
+      this._pendingActivationItem = undefined;
+      this._pendingActivationTimeout = undefined;
+    }
+  },
+  _onArrowKeyup: function(event) {
+    if (this.autoselect) {
+      this._scheduleActivation(this.focusedItem, this.autoselectDelay);
+    }
+  },
+  _onBlurCapture: function(event) {
+    if (event.target === this._pendingActivationItem) {
+      this._cancelPendingActivation();
+    }
+  },
+  get _tabContainerScrollSize() {
+    return Math.max(0, this.$.tabsContainer.scrollWidth - this.$.tabsContainer.offsetWidth);
+  },
+  _scroll: function(e, detail) {
+    if (!this.scrollable) {
+      return;
+    }
+    var ddx = detail && -detail.ddx || 0;
+    this._affectScroll(ddx);
+  },
+  _down: function(e) {
+    this.async(function() {
       if (this._defaultFocusAsync) {
         this.cancelAsync(this._defaultFocusAsync);
         this._defaultFocusAsync = null;
       }
-      var item = this._valueToItem(value);
-      if (item && item.hasAttribute('disabled')) return;
-      this._setFocusedItem(item);
-      Polymer.IronMultiSelectableBehaviorImpl.select.apply(this, arguments);
-    },
-
-    /**
-     * Resets all tabindex attributes to the appropriate value based on the
-     * current selection state. The appropriate value is `0` (focusable) for
-     * the default selected item, and `-1` (not keyboard focusable) for all
-     * other items.
-     */
-    _resetTabindices: function() {
-      var selectedItem = this.multi ? (this.selectedItems && this.selectedItems[0]) : this.selectedItem;
-
-      this.items.forEach(function(item) {
-        item.setAttribute('tabindex', item === selectedItem ? '0' : '-1');
-      }, this);
-    },
-
-    /**
-     * Sets appropriate ARIA based on whether or not the menu is meant to be
-     * multi-selectable.
-     *
-     * @param {boolean} multi True if the menu should be multi-selectable.
-     */
-    _updateMultiselectable: function(multi) {
-      if (multi) {
-        this.setAttribute('aria-multiselectable', 'true');
-      } else {
-        this.removeAttribute('aria-multiselectable');
-      }
-    },
-
-    /**
-     * Given a KeyboardEvent, this method will focus the appropriate item in the
-     * menu (if there is a relevant item, and it is possible to focus it).
-     *
-     * @param {KeyboardEvent} event A KeyboardEvent.
-     */
-    _focusWithKeyboardEvent: function(event) {
-      for (var i = 0, item; item = this.items[i]; i++) {
-        var attr = this.attrForItemTitle || 'textContent';
-        var title = item[attr] || item.getAttribute(attr);
-
-        if (!item.hasAttribute('disabled') && title &&
-            title.trim().charAt(0).toLowerCase() === String.fromCharCode(event.keyCode).toLowerCase()) {
-          this._setFocusedItem(item);
-          break;
-        }
-      }
-    },
-
-    /**
-     * Focuses the previous item (relative to the currently focused item) in the
-     * menu, disabled items will be skipped.
-     * Loop until length + 1 to handle case of single item in menu.
-     */
-    _focusPrevious: function() {
-      var length = this.items.length;
-      var curFocusIndex = Number(this.indexOf(this.focusedItem));
-      for (var i = 1; i < length + 1; i++) {
-        var item = this.items[(curFocusIndex - i + length) % length];
-        if (!item.hasAttribute('disabled')) {
-          this._setFocusedItem(item);
-          return;
-        }
-      }
-    },
-
-    /**
-     * Focuses the next item (relative to the currently focused item) in the
-     * menu, disabled items will be skipped.
-     * Loop until length + 1 to handle case of single item in menu.
-     */
-    _focusNext: function() {
-      var length = this.items.length;
-      var curFocusIndex = Number(this.indexOf(this.focusedItem));
-      for (var i = 1; i < length + 1; i++) {
-        var item = this.items[(curFocusIndex + i) % length];
-        if (!item.hasAttribute('disabled')) {
-          this._setFocusedItem(item);
-          return;
-        }
-      }
-    },
-
-    /**
-     * Mutates items in the menu based on provided selection details, so that
-     * all items correctly reflect selection state.
-     *
-     * @param {Element} item An item in the menu.
-     * @param {boolean} isSelected True if the item should be shown in a
-     * selected state, otherwise false.
-     */
-    _applySelection: function(item, isSelected) {
-      if (isSelected) {
-        item.setAttribute('aria-selected', 'true');
-      } else {
-        item.removeAttribute('aria-selected');
-      }
-      Polymer.IronSelectableBehavior._applySelection.apply(this, arguments);
-    },
-
-    /**
-     * Discretely updates tabindex values among menu items as the focused item
-     * changes.
-     *
-     * @param {Element} focusedItem The element that is currently focused.
-     * @param {?Element} old The last element that was considered focused, if
-     * applicable.
-     */
-    _focusedItemChanged: function(focusedItem, old) {
-      old && old.setAttribute('tabindex', '-1');
-      if (focusedItem) {
-        focusedItem.setAttribute('tabindex', '0');
-        focusedItem.focus();
-      }
-    },
-
-    /**
-     * A handler that responds to mutation changes related to the list of items
-     * in the menu.
-     *
-     * @param {CustomEvent} event An event containing mutation records as its
-     * detail.
-     */
-    _onIronItemsChanged: function(event) {
-      if (event.detail.addedNodes.length) {
-        this._resetTabindices();
-      }
-    },
-
-    /**
-     * Handler that is called when a shift+tab keypress is detected by the menu.
-     *
-     * @param {CustomEvent} event A key combination event.
-     */
-    _onShiftTabDown: function(event) {
-      var oldTabIndex = this.getAttribute('tabindex');
-
-      Polymer.IronMenuBehaviorImpl._shiftTabPressed = true;
-
-      this._setFocusedItem(null);
-
-      this.setAttribute('tabindex', '-1');
-
-      this.async(function() {
-        this.setAttribute('tabindex', oldTabIndex);
-        Polymer.IronMenuBehaviorImpl._shiftTabPressed = false;
-        // NOTE(cdata): polymer/polymer#1305
-      }, 1);
-    },
-
-    /**
-     * Handler that is called when the menu receives focus.
-     *
-     * @param {FocusEvent} event A focus event.
-     */
-    _onFocus: function(event) {
-      if (Polymer.IronMenuBehaviorImpl._shiftTabPressed) {
-        // do not focus the menu itself
-        return;
-      }
-
-      // Do not focus the selected tab if the deepest target is part of the
-      // menu element's local DOM and is focusable.
-      var rootTarget = /** @type {?HTMLElement} */(
-          Polymer.dom(event).rootTarget);
-      if (rootTarget !== this && typeof rootTarget.tabIndex !== "undefined" && !this.isLightDescendant(rootTarget)) {
-        return;
-      }
-
-      // clear the cached focus item
-      this._defaultFocusAsync = this.async(function() {
-        // focus the selected item when the menu receives focus, or the first item
-        // if no item is selected
-        var selectedItem = this.multi ? (this.selectedItems && this.selectedItems[0]) : this.selectedItem;
-
-        this._setFocusedItem(null);
-
-        if (selectedItem) {
-          this._setFocusedItem(selectedItem);
-        } else if (this.items[0]) {
-          // We find the first none-disabled item (if one exists)
-          this._focusNext();
-        }
-      });
-    },
-
-    /**
-     * Handler that is called when the up key is pressed.
-     *
-     * @param {CustomEvent} event A key combination event.
-     */
-    _onUpKey: function(event) {
-      // up and down arrows moves the focus
-      this._focusPrevious();
-      event.detail.keyboardEvent.preventDefault();
-    },
-
-    /**
-     * Handler that is called when the down key is pressed.
-     *
-     * @param {CustomEvent} event A key combination event.
-     */
-    _onDownKey: function(event) {
-      this._focusNext();
-      event.detail.keyboardEvent.preventDefault();
-    },
-
-    /**
-     * Handler that is called when the esc key is pressed.
-     *
-     * @param {CustomEvent} event A key combination event.
-     */
-    _onEscKey: function(event) {
-      // esc blurs the control
-      this.focusedItem.blur();
-    },
-
-    /**
-     * Handler that is called when a keydown event is detected.
-     *
-     * @param {KeyboardEvent} event A keyboard event.
-     */
-    _onKeydown: function(event) {
-      if (!this.keyboardEventMatchesKeys(event, 'up down esc')) {
-        // all other keys focus the menu item starting with that character
-        this._focusWithKeyboardEvent(event);
-      }
-      event.stopPropagation();
-    },
-
-    // override _activateHandler
-    _activateHandler: function(event) {
-      Polymer.IronSelectableBehavior._activateHandler.call(this, event);
-      event.stopPropagation();
-    }
-  };
-
-  Polymer.IronMenuBehaviorImpl._shiftTabPressed = false;
-
-  /** @polymerBehavior Polymer.IronMenuBehavior */
-  Polymer.IronMenuBehavior = [
-    Polymer.IronMultiSelectableBehavior,
-    Polymer.IronA11yKeysBehavior,
-    Polymer.IronMenuBehaviorImpl
-  ];
-/**
-   * `Polymer.IronMenubarBehavior` implements accessible menubar behavior.
-   *
-   * @polymerBehavior Polymer.IronMenubarBehavior
-   */
-  Polymer.IronMenubarBehaviorImpl = {
-
-    hostAttributes: {
-      'role': 'menubar'
-    },
-
-    keyBindings: {
-      'left': '_onLeftKey',
-      'right': '_onRightKey'
-    },
-
-    _onUpKey: function(event) {
-      this.focusedItem.click();
-      event.detail.keyboardEvent.preventDefault();
-    },
-
-    _onDownKey: function(event) {
-      this.focusedItem.click();
-      event.detail.keyboardEvent.preventDefault();
-    },
-
-    get _isRTL() {
-      return window.getComputedStyle(this)['direction'] === 'rtl';
-    },
-
-    _onLeftKey: function(event) {
-      if (this._isRTL) {
-        this._focusNext();
-      } else {
-        this._focusPrevious();
-      }
-      event.detail.keyboardEvent.preventDefault();
-    },
-
-    _onRightKey: function(event) {
-      if (this._isRTL) {
-        this._focusPrevious();
-      } else {
-        this._focusNext();
-      }
-      event.detail.keyboardEvent.preventDefault();
-    },
-
-    _onKeydown: function(event) {
-      if (this.keyboardEventMatchesKeys(event, 'up down left right esc')) {
-        return;
-      }
-
-      // all other keys focus the menu item starting with that character
-      this._focusWithKeyboardEvent(event);
-    }
-
-  };
-
-  /** @polymerBehavior Polymer.IronMenubarBehavior */
-  Polymer.IronMenubarBehavior = [
-    Polymer.IronMenuBehavior,
-    Polymer.IronMenubarBehaviorImpl
-  ];
-/**
-   * The `iron-iconset-svg` element allows users to define their own icon sets
-   * that contain svg icons. The svg icon elements should be children of the
-   * `iron-iconset-svg` element. Multiple icons should be given distinct id's.
-   *
-   * Using svg elements to create icons has a few advantages over traditional
-   * bitmap graphics like jpg or png. Icons that use svg are vector based so
-   * they are resolution independent and should look good on any device. They
-   * are stylable via css. Icons can be themed, colorized, and even animated.
-   *
-   * Example:
-   *
-   *     <iron-iconset-svg name="my-svg-icons" size="24">
-   *       <svg>
-   *         <defs>
-   *           <g id="shape">
-   *             <rect x="12" y="0" width="12" height="24" />
-   *             <circle cx="12" cy="12" r="12" />
-   *           </g>
-   *         </defs>
-   *       </svg>
-   *     </iron-iconset-svg>
-   *
-   * This will automatically register the icon set "my-svg-icons" to the iconset
-   * database.  To use these icons from within another element, make a
-   * `iron-iconset` element and call the `byId` method
-   * to retrieve a given iconset. To apply a particular icon inside an
-   * element use the `applyIcon` method. For example:
-   *
-   *     iconset.applyIcon(iconNode, 'car');
-   *
-   * @element iron-iconset-svg
-   * @demo demo/index.html
-   * @implements {Polymer.Iconset}
-   */
-  Polymer({
-    is: 'iron-iconset-svg',
-
+    }, 1);
+  },
+  _affectScroll: function(dx) {
+    this.$.tabsContainer.scrollLeft += dx;
+    var scrollLeft = this.$.tabsContainer.scrollLeft;
+    this._leftHidden = scrollLeft === 0;
+    this._rightHidden = scrollLeft === this._tabContainerScrollSize;
+  },
+  _onLeftScrollButtonDown: function() {
+    this._scrollToLeft();
+    this._holdJob = setInterval(this._scrollToLeft.bind(this), this._holdDelay);
+  },
+  _onRightScrollButtonDown: function() {
+    this._scrollToRight();
+    this._holdJob = setInterval(this._scrollToRight.bind(this), this._holdDelay);
+  },
+  _onScrollButtonUp: function() {
+    clearInterval(this._holdJob);
+    this._holdJob = null;
+  },
+  _scrollToLeft: function() {
+    this._affectScroll(-this._step);
+  },
+  _scrollToRight: function() {
+    this._affectScroll(this._step);
+  },
+  _tabChanged: function(tab, old) {
+    if (!tab) {
+      this.$.selectionBar.classList.remove('expand');
+      this.$.selectionBar.classList.remove('contract');
+      this._positionBar(0, 0);
+      return;
+    }
+    var r = this.$.tabsContent.getBoundingClientRect();
+    var w = r.width;
+    var tabRect = tab.getBoundingClientRect();
+    var tabOffsetLeft = tabRect.left - r.left;
+    this._pos = {
+      width: this._calcPercent(tabRect.width, w),
+      left: this._calcPercent(tabOffsetLeft, w)
+    };
+    if (this.noSlide || old == null) {
+      this.$.selectionBar.classList.remove('expand');
+      this.$.selectionBar.classList.remove('contract');
+      this._positionBar(this._pos.width, this._pos.left);
+      return;
+    }
+    var oldRect = old.getBoundingClientRect();
+    var oldIndex = this.items.indexOf(old);
+    var index = this.items.indexOf(tab);
+    var m = 5;
+    this.$.selectionBar.classList.add('expand');
+    var moveRight = oldIndex < index;
+    var isRTL = this._isRTL;
+    if (isRTL) {
+      moveRight = !moveRight;
+    }
+    if (moveRight) {
+      this._positionBar(this._calcPercent(tabRect.left + tabRect.width - oldRect.left, w) - m, this._left);
+    } else {
+      this._positionBar(this._calcPercent(oldRect.left + oldRect.width - tabRect.left, w) - m, this._calcPercent(tabOffsetLeft, w) + m);
+    }
+    if (this.scrollable) {
+      this._scrollToSelectedIfNeeded(tabRect.width, tabOffsetLeft);
+    }
+  },
+  _scrollToSelectedIfNeeded: function(tabWidth, tabOffsetLeft) {
+    var l = tabOffsetLeft - this.$.tabsContainer.scrollLeft;
+    if (l < 0) {
+      this.$.tabsContainer.scrollLeft += l;
+    } else {
+      l += tabWidth - this.$.tabsContainer.offsetWidth;
+      if (l > 0) {
+        this.$.tabsContainer.scrollLeft += l;
+      }
+    }
+  },
+  _calcPercent: function(w, w0) {
+    return 100 * w / w0;
+  },
+  _positionBar: function(width, left) {
+    width = width || 0;
+    left = left || 0;
+    this._width = width;
+    this._left = left;
+    this.transform('translateX(' + left + '%) scaleX(' + width / 100 + ')', this.$.selectionBar);
+  },
+  _onBarTransitionEnd: function(e) {
+    var cl = this.$.selectionBar.classList;
+    if (cl.contains('expand')) {
+      cl.remove('expand');
+      cl.add('contract');
+      this._positionBar(this._pos.width, this._pos.left);
+    } else if (cl.contains('contract')) {
+      cl.remove('contract');
+    }
+  }
+});
+
+(function() {
+  'use strict';
+  Polymer.IronA11yAnnouncer = Polymer({
+    is: 'iron-a11y-announcer',
     properties: {
-
-      /**
-       * The name of the iconset.
-       */
-      name: {
+      mode: {
         type: String,
-        observer: '_nameChanged'
+        value: 'polite'
       },
-
-      /**
-       * The size of an individual icon. Note that icons must be square.
-       */
-      size: {
-        type: Number,
-        value: 24
-      }
-
-    },
-
-    attached: function() {
-      this.style.display = 'none';
-    },
-
-    /**
-     * Construct an array of all icon names in this iconset.
-     *
-     * @return {!Array} Array of icon names.
-     */
-    getIconNames: function() {
-      this._icons = this._createIconMap();
-      return Object.keys(this._icons).map(function(n) {
-        return this.name + ':' + n;
-      }, this);
-    },
-
-    /**
-     * Applies an icon to the given element.
-     *
-     * An svg icon is prepended to the element's shadowRoot if it exists,
-     * otherwise to the element itself.
-     *
-     * @method applyIcon
-     * @param {Element} element Element to which the icon is applied.
-     * @param {string} iconName Name of the icon to apply.
-     * @return {?Element} The svg element which renders the icon.
-     */
-    applyIcon: function(element, iconName) {
-      // insert svg element into shadow root, if it exists
-      element = element.root || element;
-      // Remove old svg element
-      this.removeIcon(element);
-      // install new svg element
-      var svg = this._cloneIcon(iconName);
-      if (svg) {
-        var pde = Polymer.dom(element);
-        pde.insertBefore(svg, pde.childNodes[0]);
-        return element._svgIcon = svg;
-      }
-      return null;
-    },
-
-    /**
-     * Remove an icon from the given element by undoing the changes effected
-     * by `applyIcon`.
-     *
-     * @param {Element} element The element from which the icon is removed.
-     */
-    removeIcon: function(element) {
-      // Remove old svg element
-      if (element._svgIcon) {
-        Polymer.dom(element).removeChild(element._svgIcon);
-        element._svgIcon = null;
-      }
-    },
-
-    /**
-     *
-     * When name is changed, register iconset metadata
-     *
-     */
-    _nameChanged: function() {
-      new Polymer.IronMeta({type: 'iconset', key: this.name, value: this});
-      this.async(function() {
-        this.fire('iron-iconset-added', this, {node: window});
-      });
-    },
-
-    /**
-     * Create a map of child SVG elements by id.
-     *
-     * @return {!Object} Map of id's to SVG elements.
-     */
-    _createIconMap: function() {
-      // Objects chained to Object.prototype (`{}`) have members. Specifically,
-      // on FF there is a `watch` method that confuses the icon map, so we
-      // need to use a null-based object here.
-      var icons = Object.create(null);
-      Polymer.dom(this).querySelectorAll('[id]')
-        .forEach(function(icon) {
-          icons[icon.id] = icon;
-        });
-      return icons;
-    },
-
-    /**
-     * Produce installable clone of the SVG element matching `id` in this
-     * iconset, or `undefined` if there is no matching element.
-     *
-     * @return {Element} Returns an installable clone of the SVG element
-     * matching `id`.
-     */
-    _cloneIcon: function(id) {
-      // create the icon map on-demand, since the iconset itself has no discrete
-      // signal to know when it's children are fully parsed
-      this._icons = this._icons || this._createIconMap();
-      return this._prepareSvgClone(this._icons[id], this.size);
-    },
-
-    /**
-     * @param {Element} sourceSvg
-     * @param {number} size
-     * @return {Element}
-     */
-    _prepareSvgClone: function(sourceSvg, size) {
-      if (sourceSvg) {
-        var content = sourceSvg.cloneNode(true),
-            svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg'),
-            viewBox = content.getAttribute('viewBox') || '0 0 ' + size + ' ' + size;
-        svg.setAttribute('viewBox', viewBox);
-        svg.setAttribute('preserveAspectRatio', 'xMidYMid meet');
-        // TODO(dfreedm): `pointer-events: none` works around https://crbug.com/370136
-        // TODO(sjmiles): inline style may not be ideal, but avoids requiring a shadow-root
-        svg.style.cssText = 'pointer-events: none; display: block; width: 100%; height: 100%;';
-        svg.appendChild(content).removeAttribute('id');
-        return svg;
-      }
-      return null;
-    }
-
-  });
-Polymer({
-      is: 'paper-tabs',
-
-      behaviors: [
-        Polymer.IronResizableBehavior,
-        Polymer.IronMenubarBehavior
-      ],
-
-      properties: {
-        /**
-         * If true, ink ripple effect is disabled. When this property is changed,
-         * all descendant `<paper-tab>` elements have their `noink` property
-         * changed to the new value as well.
-         */
-        noink: {
-          type: Boolean,
-          value: false,
-          observer: '_noinkChanged'
-        },
-
-        /**
-         * If true, the bottom bar to indicate the selected tab will not be shown.
-         */
-        noBar: {
-          type: Boolean,
-          value: false
-        },
-
-        /**
-         * If true, the slide effect for the bottom bar is disabled.
-         */
-        noSlide: {
-          type: Boolean,
-          value: false
-        },
-
-        /**
-         * If true, tabs are scrollable and the tab width is based on the label width.
-         */
-        scrollable: {
-          type: Boolean,
-          value: false
-        },
-
-        /**
-         * If true, tabs expand to fit their container. This currently only applies when
-         * scrollable is true.
-         */
-        fitContainer: {
-          type: Boolean,
-          value: false
-        },
-
-        /**
-         * If true, dragging on the tabs to scroll is disabled.
-         */
-        disableDrag: {
-          type: Boolean,
-          value: false
-        },
-
-        /**
-         * If true, scroll buttons (left/right arrow) will be hidden for scrollable tabs.
-         */
-        hideScrollButtons: {
-          type: Boolean,
-          value: false
-        },
-
-        /**
-         * If true, the tabs are aligned to bottom (the selection bar appears at the top).
-         */
-        alignBottom: {
-          type: Boolean,
-          value: false
-        },
-
-        selectable: {
-          type: String,
-          value: 'paper-tab'
-        },
-
-        /**
-         * If true, tabs are automatically selected when focused using the
-         * keyboard.
-         */
-        autoselect: {
-          type: Boolean,
-          value: false
-        },
-
-        /**
-         * The delay (in milliseconds) between when the user stops interacting
-         * with the tabs through the keyboard and when the focused item is
-         * automatically selected (if `autoselect` is true).
-         */
-        autoselectDelay: {
-          type: Number,
-          value: 0
-        },
-
-        _step: {
-          type: Number,
-          value: 10
-        },
-
-        _holdDelay: {
-          type: Number,
-          value: 1
-        },
-
-        _leftHidden: {
-          type: Boolean,
-          value: false
-        },
-
-        _rightHidden: {
-          type: Boolean,
-          value: false
-        },
-
-        _previousTab: {
-          type: Object
-        }
-      },
-
-      hostAttributes: {
-        role: 'tablist'
-      },
-
-      listeners: {
-        'iron-resize': '_onTabSizingChanged',
-        'iron-items-changed': '_onTabSizingChanged',
-        'iron-select': '_onIronSelect',
-        'iron-deselect': '_onIronDeselect'
-      },
-
-      keyBindings: {
-        'left:keyup right:keyup': '_onArrowKeyup'
-      },
-
-      created: function() {
-        this._holdJob = null;
-        this._pendingActivationItem = undefined;
-        this._pendingActivationTimeout = undefined;
-        this._bindDelayedActivationHandler = this._delayedActivationHandler.bind(this);
-        this.addEventListener('blur', this._onBlurCapture.bind(this), true);
-      },
-
-      ready: function() {
-        this.setScrollDirection('y', this.$.tabsContainer);
-      },
-
-      detached: function() {
-        this._cancelPendingActivation();
-      },
-
-      _noinkChanged: function(noink) {
-        var childTabs = Polymer.dom(this).querySelectorAll('paper-tab');
-        childTabs.forEach(noink ? this._setNoinkAttribute : this._removeNoinkAttribute);
-      },
-
-      _setNoinkAttribute: function(element) {
-        element.setAttribute('noink', '');
-      },
-
-      _removeNoinkAttribute: function(element) {
-        element.removeAttribute('noink');
-      },
-
-      _computeScrollButtonClass: function(hideThisButton, scrollable, hideScrollButtons) {
-        if (!scrollable || hideScrollButtons) {
-          return 'hidden';
-        }
-
-        if (hideThisButton) {
-          return 'not-visible';
-        }
-
-        return '';
-      },
-
-      _computeTabsContentClass: function(scrollable, fitContainer) {
-        return scrollable ? 'scrollable' + (fitContainer ? ' fit-container' : '') : ' fit-container';
-      },
-
-      _computeSelectionBarClass: function(noBar, alignBottom) {
-        if (noBar) {
-          return 'hidden';
-        } else if (alignBottom) {
-          return 'align-bottom';
-        }
-
-        return '';
-      },
-
-      // TODO(cdata): Add `track` response back in when gesture lands.
-
-      _onTabSizingChanged: function() {
-        this.debounce('_onTabSizingChanged', function() {
-          this._scroll();
-          this._tabChanged(this.selectedItem);
-        }, 10);
-      },
-
-      _onIronSelect: function(event) {
-        this._tabChanged(event.detail.item, this._previousTab);
-        this._previousTab = event.detail.item;
-        this.cancelDebouncer('tab-changed');
-      },
-
-      _onIronDeselect: function(event) {
-        this.debounce('tab-changed', function() {
-          this._tabChanged(null, this._previousTab);
-          this._previousTab = null;
-        // See polymer/polymer#1305
-        }, 1);
-      },
-
-      _activateHandler: function() {
-        // Cancel item activations scheduled by keyboard events when any other
-        // action causes an item to be activated (e.g. clicks).
-        this._cancelPendingActivation();
-
-        Polymer.IronMenuBehaviorImpl._activateHandler.apply(this, arguments);
-      },
-
-      /**
-       * Activates an item after a delay (in milliseconds).
-       */
-      _scheduleActivation: function(item, delay) {
-        this._pendingActivationItem = item;
-        this._pendingActivationTimeout = this.async(
-            this._bindDelayedActivationHandler, delay);
-      },
-
-      /**
-       * Activates the last item given to `_scheduleActivation`.
-       */
-      _delayedActivationHandler: function() {
-        var item = this._pendingActivationItem;
-        this._pendingActivationItem = undefined;
-        this._pendingActivationTimeout = undefined;
-        item.fire(this.activateEvent, null, {
-          bubbles: true,
-          cancelable: true
-        });
-      },
-
-      /**
-       * Cancels a previously scheduled item activation made with
-       * `_scheduleActivation`.
-       */
-      _cancelPendingActivation: function() {
-        if (this._pendingActivationTimeout !== undefined) {
-          this.cancelAsync(this._pendingActivationTimeout);
-          this._pendingActivationItem = undefined;
-          this._pendingActivationTimeout = undefined;
-        }
-      },
-
-      _onArrowKeyup: function(event) {
-        if (this.autoselect) {
-          this._scheduleActivation(this.focusedItem, this.autoselectDelay);
-        }
-      },
-
-      _onBlurCapture: function(event) {
-        // Cancel a scheduled item activation (if any) when that item is
-        // blurred.
-        if (event.target === this._pendingActivationItem) {
-          this._cancelPendingActivation();
-        }
-      },
-
-      get _tabContainerScrollSize () {
-        return Math.max(
-          0,
-          this.$.tabsContainer.scrollWidth -
-            this.$.tabsContainer.offsetWidth
-        );
-      },
-
-      _scroll: function(e, detail) {
-        if (!this.scrollable) {
-          return;
-        }
-
-        var ddx = (detail && -detail.ddx) || 0;
-        this._affectScroll(ddx);
-      },
-
-      _down: function(e) {
-        // go one beat async to defeat IronMenuBehavior
-        // autorefocus-on-no-selection timeout
-        this.async(function() {
-          if (this._defaultFocusAsync) {
-            this.cancelAsync(this._defaultFocusAsync);
-            this._defaultFocusAsync = null;
-          }
-        }, 1);
-      },
-
-      _affectScroll: function(dx) {
-        this.$.tabsContainer.scrollLeft += dx;
-
-        var scrollLeft = this.$.tabsContainer.scrollLeft;
-
-        this._leftHidden = scrollLeft === 0;
-        this._rightHidden = scrollLeft === this._tabContainerScrollSize;
-      },
-
-      _onLeftScrollButtonDown: function() {
-        this._scrollToLeft();
-        this._holdJob = setInterval(this._scrollToLeft.bind(this), this._holdDelay);
-      },
-
-      _onRightScrollButtonDown: function() {
-        this._scrollToRight();
-        this._holdJob = setInterval(this._scrollToRight.bind(this), this._holdDelay);
-      },
-
-      _onScrollButtonUp: function() {
-        clearInterval(this._holdJob);
-        this._holdJob = null;
-      },
-
-      _scrollToLeft: function() {
-        this._affectScroll(-this._step);
-      },
-
-      _scrollToRight: function() {
-        this._affectScroll(this._step);
-      },
-
-      _tabChanged: function(tab, old) {
-        if (!tab) {
-          // Remove the bar without animation.
-          this.$.selectionBar.classList.remove('expand');
-          this.$.selectionBar.classList.remove('contract');
-          this._positionBar(0, 0);
-          return;
-        }
-
-        var r = this.$.tabsContent.getBoundingClientRect();
-        var w = r.width;
-        var tabRect = tab.getBoundingClientRect();
-        var tabOffsetLeft = tabRect.left - r.left;
-
-        this._pos = {
-          width: this._calcPercent(tabRect.width, w),
-          left: this._calcPercent(tabOffsetLeft, w)
-        };
-
-        if (this.noSlide || old == null) {
-          // Position the bar without animation.
-          this.$.selectionBar.classList.remove('expand');
-          this.$.selectionBar.classList.remove('contract');
-          this._positionBar(this._pos.width, this._pos.left);
-          return;
-        }
-
-        var oldRect = old.getBoundingClientRect();
-        var oldIndex = this.items.indexOf(old);
-        var index = this.items.indexOf(tab);
-        var m = 5;
-
-        // bar animation: expand
-        this.$.selectionBar.classList.add('expand');
-
-        var moveRight = oldIndex < index;
-        var isRTL = this._isRTL;
-        if (isRTL) {
-          moveRight = !moveRight;
-        }
-
-        if (moveRight) {
-          this._positionBar(this._calcPercent(tabRect.left + tabRect.width - oldRect.left, w) - m,
-              this._left);
-        } else {
-          this._positionBar(this._calcPercent(oldRect.left + oldRect.width - tabRect.left, w) - m,
-              this._calcPercent(tabOffsetLeft, w) + m);
-        }
-
-        if (this.scrollable) {
-          this._scrollToSelectedIfNeeded(tabRect.width, tabOffsetLeft);
-        }
-      },
-
-      _scrollToSelectedIfNeeded: function(tabWidth, tabOffsetLeft) {
-        var l = tabOffsetLeft - this.$.tabsContainer.scrollLeft;
-        if (l < 0) {
-          this.$.tabsContainer.scrollLeft += l;
-        } else {
-          l += (tabWidth - this.$.tabsContainer.offsetWidth);
-          if (l > 0) {
-            this.$.tabsContainer.scrollLeft += l;
-          }
-        }
-      },
-
-      _calcPercent: function(w, w0) {
-        return 100 * w / w0;
-      },
-
-      _positionBar: function(width, left) {
-        width = width || 0;
-        left = left || 0;
-
-        this._width = width;
-        this._left = left;
-        this.transform(
-            'translateX(' + left + '%) scaleX(' + (width / 100) + ')',
-            this.$.selectionBar);
-      },
-
-      _onBarTransitionEnd: function(e) {
-        var cl = this.$.selectionBar.classList;
-        // bar animation: expand -> contract
-        if (cl.contains('expand')) {
-          cl.remove('expand');
-          cl.add('contract');
-          this._positionBar(this._pos.width, this._pos.left);
-        // bar animation done
-        } else if (cl.contains('contract')) {
-          cl.remove('contract');
-        }
-      }
-    });
-(function() {
-      'use strict';
-
-      Polymer.IronA11yAnnouncer = Polymer({
-        is: 'iron-a11y-announcer',
-
-        properties: {
-
-          /**
-           * The value of mode is used to set the `aria-live` attribute
-           * for the element that will be announced. Valid values are: `off`,
-           * `polite` and `assertive`.
-           */
-          mode: {
-            type: String,
-            value: 'polite'
-          },
-
-          _text: {
-            type: String,
-            value: ''
-          }
-        },
-
-        created: function() {
-          if (!Polymer.IronA11yAnnouncer.instance) {
-            Polymer.IronA11yAnnouncer.instance = this;
-          }
-
-          document.body.addEventListener('iron-announce', this._onIronAnnounce.bind(this));
-        },
-
-        /**
-         * Cause a text string to be announced by screen readers.
-         *
-         * @param {string} text The text that should be announced.
-         */
-        announce: function(text) {
-          this._text = '';
-          this.async(function() {
-            this._text = text;
-          }, 100);
-        },
-
-        _onIronAnnounce: function(event) {
-          if (event.detail && event.detail.text) {
-            this.announce(event.detail.text);
-          }
-        }
-      });
-
-      Polymer.IronA11yAnnouncer.instance = null;
-
-      Polymer.IronA11yAnnouncer.requestAvailability = function() {
-        if (!Polymer.IronA11yAnnouncer.instance) {
-          Polymer.IronA11yAnnouncer.instance = document.createElement('iron-a11y-announcer');
-        }
-
-        document.body.appendChild(Polymer.IronA11yAnnouncer.instance);
-      };
-    })();
-/**
-   * Singleton IronMeta instance.
-   */
-  Polymer.IronValidatableBehaviorMeta = null;
-
-  /**
-   * `Use Polymer.IronValidatableBehavior` to implement an element that validates user input.
-   * Use the related `Polymer.IronValidatorBehavior` to add custom validation logic to an iron-input.
-   *
-   * By default, an `<iron-form>` element validates its fields when the user presses the submit button.
-   * To validate a form imperatively, call the form's `validate()` method, which in turn will
-   * call `validate()` on all its children. By using `Polymer.IronValidatableBehavior`, your
-   * custom element will get a public `validate()`, which
-   * will return the validity of the element, and a corresponding `invalid` attribute,
-   * which can be used for styling.
-   *
-   * To implement the custom validation logic of your element, you must override
-   * the protected `_getValidity()` method of this behaviour, rather than `validate()`.
-   * See [this](https://github.com/PolymerElements/iron-form/blob/master/demo/simple-element.html)
-   * for an example.
-   *
-   * ### Accessibility
-   *
-   * Changing the `invalid` property, either manually or by calling `validate()` will update the
-   * `aria-invalid` attribute.
-   *
-   * @demo demo/index.html
-   * @polymerBehavior
-   */
-  Polymer.IronValidatableBehavior = {
-
-    properties: {
-
-      /**
-       * Name of the validator to use.
-       */
-      validator: {
-        type: String
-      },
-
-      /**
-       * True if the last call to `validate` is invalid.
-       */
-      invalid: {
-        notify: true,
-        reflectToAttribute: true,
-        type: Boolean,
-        value: false
-      },
-
-      /**
-       * This property is deprecated and should not be used. Use the global
-       * validator meta singleton, `Polymer.IronValidatableBehaviorMeta` instead.
-       */
-      _validatorMeta: {
-        type: Object
-      },
-
-      /**
-       * Namespace for this validator. This property is deprecated and should
-       * not be used. For all intents and purposes, please consider it a
-       * read-only, config-time property.
-       */
-      validatorType: {
-        type: String,
-        value: 'validator'
-      },
-
-      _validator: {
-        type: Object,
-        computed: '__computeValidator(validator)'
-      }
-    },
-
-    observers: [
-      '_invalidChanged(invalid)'
-    ],
-
-    registered: function() {
-      Polymer.IronValidatableBehaviorMeta = new Polymer.IronMeta({type: 'validator'});
-    },
-
-    _invalidChanged: function() {
-      if (this.invalid) {
-        this.setAttribute('aria-invalid', 'true');
-      } else {
-        this.removeAttribute('aria-invalid');
-      }
-    },
-
-    /**
-     * @return {boolean} True if the validator `validator` exists.
-     */
-    hasValidator: function() {
-      return this._validator != null;
-    },
-
-    /**
-     * Returns true if the `value` is valid, and updates `invalid`. If you want
-     * your element to have custom validation logic, do not override this method;
-     * override `_getValidity(value)` instead.
-
-     * @param {Object} value The value to be validated. By default, it is passed
-     * to the validator's `validate()` function, if a validator is set.
-     * @return {boolean} True if `value` is valid.
-     */
-    validate: function(value) {
-      this.invalid = !this._getValidity(value);
-      return !this.invalid;
-    },
-
-    /**
-     * Returns true if `value` is valid.  By default, it is passed
-     * to the validator's `validate()` function, if a validator is set. You
-     * should override this method if you want to implement custom validity
-     * logic for your element.
-     *
-     * @param {Object} value The value to be validated.
-     * @return {boolean} True if `value` is valid.
-     */
-
-    _getValidity: function(value) {
-      if (this.hasValidator()) {
-        return this._validator.validate(value);
-      }
-      return true;
-    },
-
-    __computeValidator: function() {
-      return Polymer.IronValidatableBehaviorMeta &&
-          Polymer.IronValidatableBehaviorMeta.byKey(this.validator);
-    }
-  };
-/*
-`<iron-input>` adds two-way binding and custom validators using `Polymer.IronValidatorBehavior`
-to `<input>`.
-
-### Two-way binding
-
-By default you can only get notified of changes to an `input`'s `value` due to user input:
-
-    <input value="{{myValue::input}}">
-
-`iron-input` adds the `bind-value` property that mirrors the `value` property, and can be used
-for two-way data binding. `bind-value` will notify if it is changed either by user input or by script.
-
-    <input is="iron-input" bind-value="{{myValue}}">
-
-### Custom validators
-
-You can use custom validators that implement `Polymer.IronValidatorBehavior` with `<iron-input>`.
-
-    <input is="iron-input" validator="my-custom-validator">
-
-### Stopping invalid input
-
-It may be desirable to only allow users to enter certain characters. You can use the
-`prevent-invalid-input` and `allowed-pattern` attributes together to accomplish this. This feature
-is separate from validation, and `allowed-pattern` does not affect how the input is validated.
-
-    \x3c!-- only allow characters that match [0-9] --\x3e
-    <input is="iron-input" prevent-invalid-input allowed-pattern="[0-9]">
-
-@hero hero.svg
-@demo demo/index.html
-*/
-
-  Polymer({
-
-    is: 'iron-input',
-
-    extends: 'input',
-
-    behaviors: [
-      Polymer.IronValidatableBehavior
-    ],
-
-    properties: {
-
-      /**
-       * Use this property instead of `value` for two-way data binding.
-       */
-      bindValue: {
-        observer: '_bindValueChanged',
-        type: String
-      },
-
-      /**
-       * Set to true to prevent the user from entering invalid input. If `allowedPattern` is set,
-       * any character typed by the user will be matched against that pattern, and rejected if it's not a match.
-       * Pasted input will have each character checked individually; if any character
-       * doesn't match `allowedPattern`, the entire pasted string will be rejected.
-       * If `allowedPattern` is not set, it will use the `type` attribute (only supported for `type=number`).
-       */
-      preventInvalidInput: {
-        type: Boolean
-      },
-
-      /**
-       * Regular expression that list the characters allowed as input.
-       * This pattern represents the allowed characters for the field; as the user inputs text,
-       * each individual character will be checked against the pattern (rather than checking
-       * the entire value as a whole). The recommended format should be a list of allowed characters;
-       * for example, `[a-zA-Z0-9.+-!;:]`
-       */
-      allowedPattern: {
-        type: String,
-        observer: "_allowedPatternChanged"
-      },
-
-      _previousValidInput: {
+      _text: {
         type: String,
         value: ''
-      },
-
-      _patternAlreadyChecked: {
-        type: Boolean,
-        value: false
-      }
-
-    },
-
-    listeners: {
-      'input': '_onInput',
-      'keypress': '_onKeypress'
-    },
-
-    /** @suppress {checkTypes} */
-    registered: function() {
-      // Feature detect whether we need to patch dispatchEvent (i.e. on FF and IE).
-      if (!this._canDispatchEventOnDisabled()) {
-        this._origDispatchEvent = this.dispatchEvent;
-        this.dispatchEvent = this._dispatchEventFirefoxIE;
-      }
-    },
-
+      }
+    },
     created: function() {
-      Polymer.IronA11yAnnouncer.requestAvailability();
-    },
-
-    _canDispatchEventOnDisabled: function() {
-      var input = document.createElement('input');
-      var canDispatch = false;
-      input.disabled = true;
-
-      input.addEventListener('feature-check-dispatch-event', function() {
-        canDispatch = true;
-      });
-
-      try {
-        input.dispatchEvent(new Event('feature-check-dispatch-event'));
-      } catch(e) {}
-
-      return canDispatch;
-    },
-
-    _dispatchEventFirefoxIE: function() {
-      // Due to Firefox bug, events fired on disabled form controls can throw
-      // errors; furthermore, neither IE nor Firefox will actually dispatch
-      // events from disabled form controls; as such, we toggle disable around
-      // the dispatch to allow notifying properties to notify
-      // See issue #47 for details
-      var disabled = this.disabled;
-      this.disabled = false;
-      this._origDispatchEvent.apply(this, arguments);
-      this.disabled = disabled;
-    },
-
-    get _patternRegExp() {
-      var pattern;
-      if (this.allowedPattern) {
-        pattern = new RegExp(this.allowedPattern);
+      if (!Polymer.IronA11yAnnouncer.instance) {
+        Polymer.IronA11yAnnouncer.instance = this;
+      }
+      document.body.addEventListener('iron-announce', this._onIronAnnounce.bind(this));
+    },
+    announce: function(text) {
+      this._text = '';
+      this.async(function() {
+        this._text = text;
+      }, 100);
+    },
+    _onIronAnnounce: function(event) {
+      if (event.detail && event.detail.text) {
+        this.announce(event.detail.text);
+      }
+    }
+  });
+  Polymer.IronA11yAnnouncer.instance = null;
+  Polymer.IronA11yAnnouncer.requestAvailability = function() {
+    if (!Polymer.IronA11yAnnouncer.instance) {
+      Polymer.IronA11yAnnouncer.instance = document.createElement('iron-a11y-announcer');
+    }
+    document.body.appendChild(Polymer.IronA11yAnnouncer.instance);
+  };
+})();
+
+Polymer.IronValidatableBehaviorMeta = null;
+
+Polymer.IronValidatableBehavior = {
+  properties: {
+    validator: {
+      type: String
+    },
+    invalid: {
+      notify: true,
+      reflectToAttribute: true,
+      type: Boolean,
+      value: false
+    },
+    _validatorMeta: {
+      type: Object
+    },
+    validatorType: {
+      type: String,
+      value: 'validator'
+    },
+    _validator: {
+      type: Object,
+      computed: '__computeValidator(validator)'
+    }
+  },
+  observers: [ '_invalidChanged(invalid)' ],
+  registered: function() {
+    Polymer.IronValidatableBehaviorMeta = new Polymer.IronMeta({
+      type: 'validator'
+    });
+  },
+  _invalidChanged: function() {
+    if (this.invalid) {
+      this.setAttribute('aria-invalid', 'true');
+    } else {
+      this.removeAttribute('aria-invalid');
+    }
+  },
+  hasValidator: function() {
+    return this._validator != null;
+  },
+  validate: function(value) {
+    this.invalid = !this._getValidity(value);
+    return !this.invalid;
+  },
+  _getValidity: function(value) {
+    if (this.hasValidator()) {
+      return this._validator.validate(value);
+    }
+    return true;
+  },
+  __computeValidator: function() {
+    return Polymer.IronValidatableBehaviorMeta && Polymer.IronValidatableBehaviorMeta.byKey(this.validator);
+  }
+};
+
+Polymer({
+  is: 'iron-input',
+  "extends": 'input',
+  behaviors: [ Polymer.IronValidatableBehavior ],
+  properties: {
+    bindValue: {
+      observer: '_bindValueChanged',
+      type: String
+    },
+    preventInvalidInput: {
+      type: Boolean
+    },
+    allowedPattern: {
+      type: String,
+      observer: "_allowedPatternChanged"
+    },
+    _previousValidInput: {
+      type: String,
+      value: ''
+    },
+    _patternAlreadyChecked: {
+      type: Boolean,
+      value: false
+    }
+  },
+  listeners: {
+    input: '_onInput',
+    keypress: '_onKeypress'
+  },
+  registered: function() {
+    if (!this._canDispatchEventOnDisabled()) {
+      this._origDispatchEvent = this.dispatchEvent;
+      this.dispatchEvent = this._dispatchEventFirefoxIE;
+    }
+  },
+  created: function() {
+    Polymer.IronA11yAnnouncer.requestAvailability();
+  },
+  _canDispatchEventOnDisabled: function() {
+    var input = document.createElement('input');
+    var canDispatch = false;
+    input.disabled = true;
+    input.addEventListener('feature-check-dispatch-event', function() {
+      canDispatch = true;
+    });
+    try {
+      input.dispatchEvent(new Event('feature-check-dispatch-event'));
+    } catch (e) {}
+    return canDispatch;
+  },
+  _dispatchEventFirefoxIE: function() {
+    var disabled = this.disabled;
+    this.disabled = false;
+    this._origDispatchEvent.apply(this, arguments);
+    this.disabled = disabled;
+  },
+  get _patternRegExp() {
+    var pattern;
+    if (this.allowedPattern) {
+      pattern = new RegExp(this.allowedPattern);
+    } else {
+      switch (this.type) {
+       case 'number':
+        pattern = /[0-9.,e-]/;
+        break;
+      }
+    }
+    return pattern;
+  },
+  ready: function() {
+    this.bindValue = this.value;
+  },
+  _bindValueChanged: function() {
+    if (this.value !== this.bindValue) {
+      this.value = !(this.bindValue || this.bindValue === 0 || this.bindValue === false) ? '' : this.bindValue;
+    }
+    this.fire('bind-value-changed', {
+      value: this.bindValue
+    });
+  },
+  _allowedPatternChanged: function() {
+    this.preventInvalidInput = this.allowedPattern ? true : false;
+  },
+  _onInput: function() {
+    if (this.preventInvalidInput && !this._patternAlreadyChecked) {
+      var valid = this._checkPatternValidity();
+      if (!valid) {
+        this._announceInvalidCharacter('Invalid string of characters not entered.');
+        this.value = this._previousValidInput;
+      }
+    }
+    this.bindValue = this.value;
+    this._previousValidInput = this.value;
+    this._patternAlreadyChecked = false;
+  },
+  _isPrintable: function(event) {
+    var anyNonPrintable = event.keyCode == 8 || event.keyCode == 9 || event.keyCode == 13 || event.keyCode == 27;
+    var mozNonPrintable = event.keyCode == 19 || event.keyCode == 20 || event.keyCode == 45 || event.keyCode == 46 || event.keyCode == 144 || event.keyCode == 145 || event.keyCode > 32 && event.keyCode < 41 || event.keyCode > 111 && event.keyCode < 124;
+    return !anyNonPrintable && !(event.charCode == 0 && mozNonPrintable);
+  },
+  _onKeypress: function(event) {
+    if (!this.preventInvalidInput && this.type !== 'number') {
+      return;
+    }
+    var regexp = this._patternRegExp;
+    if (!regexp) {
+      return;
+    }
+    if (event.metaKey || event.ctrlKey || event.altKey) return;
+    this._patternAlreadyChecked = true;
+    var thisChar = String.fromCharCode(event.charCode);
+    if (this._isPrintable(event) && !regexp.test(thisChar)) {
+      event.preventDefault();
+      this._announceInvalidCharacter('Invalid character ' + thisChar + ' not entered.');
+    }
+  },
+  _checkPatternValidity: function() {
+    var regexp = this._patternRegExp;
+    if (!regexp) {
+      return true;
+    }
+    for (var i = 0; i < this.value.length; i++) {
+      if (!regexp.test(this.value[i])) {
+        return false;
+      }
+    }
+    return true;
+  },
+  validate: function() {
+    var valid = this.checkValidity();
+    if (valid) {
+      if (this.required && this.value === '') {
+        valid = false;
+      } else if (this.hasValidator()) {
+        valid = Polymer.IronValidatableBehavior.validate.call(this, this.value);
+      }
+    }
+    this.invalid = !valid;
+    this.fire('iron-input-validate');
+    return valid;
+  },
+  _announceInvalidCharacter: function(message) {
+    this.fire('iron-announce', {
+      text: message
+    });
+  }
+});
+
+Polymer({
+  is: 'paper-input-container',
+  properties: {
+    noLabelFloat: {
+      type: Boolean,
+      value: false
+    },
+    alwaysFloatLabel: {
+      type: Boolean,
+      value: false
+    },
+    attrForValue: {
+      type: String,
+      value: 'bind-value'
+    },
+    autoValidate: {
+      type: Boolean,
+      value: false
+    },
+    invalid: {
+      observer: '_invalidChanged',
+      type: Boolean,
+      value: false
+    },
+    focused: {
+      readOnly: true,
+      type: Boolean,
+      value: false,
+      notify: true
+    },
+    _addons: {
+      type: Array
+    },
+    _inputHasContent: {
+      type: Boolean,
+      value: false
+    },
+    _inputSelector: {
+      type: String,
+      value: 'input,textarea,.paper-input-input'
+    },
+    _boundOnFocus: {
+      type: Function,
+      value: function() {
+        return this._onFocus.bind(this);
+      }
+    },
+    _boundOnBlur: {
+      type: Function,
+      value: function() {
+        return this._onBlur.bind(this);
+      }
+    },
+    _boundOnInput: {
+      type: Function,
+      value: function() {
+        return this._onInput.bind(this);
+      }
+    },
+    _boundValueChanged: {
+      type: Function,
+      value: function() {
+        return this._onValueChanged.bind(this);
+      }
+    }
+  },
+  listeners: {
+    'addon-attached': '_onAddonAttached',
+    'iron-input-validate': '_onIronInputValidate'
+  },
+  get _valueChangedEvent() {
+    return this.attrForValue + '-changed';
+  },
+  get _propertyForValue() {
+    return Polymer.CaseMap.dashToCamelCase(this.attrForValue);
+  },
+  get _inputElement() {
+    return Polymer.dom(this).querySelector(this._inputSelector);
+  },
+  get _inputElementValue() {
+    return this._inputElement[this._propertyForValue] || this._inputElement.value;
+  },
+  ready: function() {
+    if (!this._addons) {
+      this._addons = [];
+    }
+    this.addEventListener('focus', this._boundOnFocus, true);
+    this.addEventListener('blur', this._boundOnBlur, true);
+  },
+  attached: function() {
+    if (this.attrForValue) {
+      this._inputElement.addEventListener(this._valueChangedEvent, this._boundValueChanged);
+    } else {
+      this.addEventListener('input', this._onInput);
+    }
+    if (this._inputElementValue != '') {
+      this._handleValueAndAutoValidate(this._inputElement);
+    } else {
+      this._handleValue(this._inputElement);
+    }
+  },
+  _onAddonAttached: function(event) {
+    if (!this._addons) {
+      this._addons = [];
+    }
+    var target = event.target;
+    if (this._addons.indexOf(target) === -1) {
+      this._addons.push(target);
+      if (this.isAttached) {
+        this._handleValue(this._inputElement);
+      }
+    }
+  },
+  _onFocus: function() {
+    this._setFocused(true);
+  },
+  _onBlur: function() {
+    this._setFocused(false);
+    this._handleValueAndAutoValidate(this._inputElement);
+  },
+  _onInput: function(event) {
+    this._handleValueAndAutoValidate(event.target);
+  },
+  _onValueChanged: function(event) {
+    this._handleValueAndAutoValidate(event.target);
+  },
+  _handleValue: function(inputElement) {
+    var value = this._inputElementValue;
+    if (value || value === 0 || inputElement.type === 'number' && !inputElement.checkValidity()) {
+      this._inputHasContent = true;
+    } else {
+      this._inputHasContent = false;
+    }
+    this.updateAddons({
+      inputElement: inputElement,
+      value: value,
+      invalid: this.invalid
+    });
+  },
+  _handleValueAndAutoValidate: function(inputElement) {
+    if (this.autoValidate) {
+      var valid;
+      if (inputElement.validate) {
+        valid = inputElement.validate(this._inputElementValue);
       } else {
-        switch (this.type) {
-          case 'number':
-            pattern = /[0-9.,e-]/;
-            break;
-        }
-      }
-      return pattern;
-    },
-
-    ready: function() {
-      this.bindValue = this.value;
-    },
-
-    /**
-     * @suppress {checkTypes}
-     */
-    _bindValueChanged: function() {
-      if (this.value !== this.bindValue) {
-        this.value = !(this.bindValue || this.bindValue === 0 || this.bindValue === false) ? '' : this.bindValue;
-      }
-      // manually notify because we don't want to notify until after setting value
-      this.fire('bind-value-changed', {value: this.bindValue});
-    },
-
-    _allowedPatternChanged: function() {
-      // Force to prevent invalid input when an `allowed-pattern` is set
-      this.preventInvalidInput = this.allowedPattern ? true : false;
-    },
-
-    _onInput: function() {
-      // Need to validate each of the characters pasted if they haven't
-      // been validated inside `_onKeypress` already.
-      if (this.preventInvalidInput && !this._patternAlreadyChecked) {
-        var valid = this._checkPatternValidity();
-        if (!valid) {
-          this._announceInvalidCharacter('Invalid string of characters not entered.');
-          this.value = this._previousValidInput;
-        }
-      }
-
-      this.bindValue = this.value;
-      this._previousValidInput = this.value;
-      this._patternAlreadyChecked = false;
-    },
-
-    _isPrintable: function(event) {
-      // What a control/printable character is varies wildly based on the browser.
-      // - most control characters (arrows, backspace) do not send a `keypress` event
-      //   in Chrome, but the *do* on Firefox
-      // - in Firefox, when they do send a `keypress` event, control chars have
-      //   a charCode = 0, keyCode = xx (for ex. 40 for down arrow)
-      // - printable characters always send a keypress event.
-      // - in Firefox, printable chars always have a keyCode = 0. In Chrome, the keyCode
-      //   always matches the charCode.
-      // None of this makes any sense.
-
-      // For these keys, ASCII code == browser keycode.
-      var anyNonPrintable =
-        (event.keyCode == 8)   ||  // backspace
-        (event.keyCode == 9)   ||  // tab
-        (event.keyCode == 13)  ||  // enter
-        (event.keyCode == 27);     // escape
-
-      // For these keys, make sure it's a browser keycode and not an ASCII code.
-      var mozNonPrintable =
-        (event.keyCode == 19)  ||  // pause
-        (event.keyCode == 20)  ||  // caps lock
-        (event.keyCode == 45)  ||  // insert
-        (event.keyCode == 46)  ||  // delete
-        (event.keyCode == 144) ||  // num lock
-        (event.keyCode == 145) ||  // scroll lock
-        (event.keyCode > 32 && event.keyCode < 41)   || // page up/down, end, home, arrows
-        (event.keyCode > 111 && event.keyCode < 124); // fn keys
-
-      return !anyNonPrintable && !(event.charCode == 0 && mozNonPrintable);
-    },
-
-    _onKeypress: function(event) {
-      if (!this.preventInvalidInput && this.type !== 'number') {
-        return;
-      }
-      var regexp = this._patternRegExp;
-      if (!regexp) {
-        return;
-      }
-
-      // Handle special keys and backspace
-      if (event.metaKey || event.ctrlKey || event.altKey)
-        return;
-
-      // Check the pattern either here or in `_onInput`, but not in both.
-      this._patternAlreadyChecked = true;
-
-      var thisChar = String.fromCharCode(event.charCode);
-      if (this._isPrintable(event) && !regexp.test(thisChar)) {
-        event.preventDefault();
-        this._announceInvalidCharacter('Invalid character ' + thisChar + ' not entered.');
-      }
-    },
-
-    _checkPatternValidity: function() {
-      var regexp = this._patternRegExp;
-      if (!regexp) {
-        return true;
-      }
-      for (var i = 0; i < this.value.length; i++) {
-        if (!regexp.test(this.value[i])) {
-          return false;
-        }
-      }
-      return true;
-    },
-
-    /**
-     * Returns true if `value` is valid. The validator provided in `validator` will be used first,
-     * then any constraints.
-     * @return {boolean} True if the value is valid.
-     */
-    validate: function() {
-      // First, check what the browser thinks. Some inputs (like type=number)
-      // behave weirdly and will set the value to "" if something invalid is
-      // entered, but will set the validity correctly.
-      var valid =  this.checkValidity();
-
-      // Only do extra checking if the browser thought this was valid.
-      if (valid) {
-        // Empty, required input is invalid
-        if (this.required && this.value === '') {
-          valid = false;
-        } else if (this.hasValidator()) {
-          valid = Polymer.IronValidatableBehavior.validate.call(this, this.value);
-        }
-      }
-
+        valid = inputElement.checkValidity();
+      }
       this.invalid = !valid;
-      this.fire('iron-input-validate');
-      return valid;
-    },
-
-    _announceInvalidCharacter: function(message) {
-      this.fire('iron-announce', { text: message });
-    }
-  });
-
-  /*
-  The `iron-input-validate` event is fired whenever `validate()` is called.
-  @event iron-input-validate
-  */
-Polymer({
-    is: 'paper-input-container',
-
-    properties: {
-      /**
-       * Set to true to disable the floating label. The label disappears when the input value is
-       * not null.
-       */
-      noLabelFloat: {
-        type: Boolean,
-        value: false
-      },
-
-      /**
-       * Set to true to always float the floating label.
-       */
-      alwaysFloatLabel: {
-        type: Boolean,
-        value: false
-      },
-
-      /**
-       * The attribute to listen for value changes on.
-       */
-      attrForValue: {
-        type: String,
-        value: 'bind-value'
-      },
-
-      /**
-       * Set to true to auto-validate the input value when it changes.
-       */
-      autoValidate: {
-        type: Boolean,
-        value: false
-      },
-
-      /**
-       * True if the input is invalid. This property is set automatically when the input value
-       * changes if auto-validating, or when the `iron-input-validate` event is heard from a child.
-       */
-      invalid: {
-        observer: '_invalidChanged',
-        type: Boolean,
-        value: false
-      },
-
-      /**
-       * True if the input has focus.
-       */
-      focused: {
-        readOnly: true,
-        type: Boolean,
-        value: false,
-        notify: true
-      },
-
-      _addons: {
-        type: Array
-        // do not set a default value here intentionally - it will be initialized lazily when a
-        // distributed child is attached, which may occur before configuration for this element
-        // in polyfill.
-      },
-
-      _inputHasContent: {
-        type: Boolean,
-        value: false
-      },
-
-      _inputSelector: {
-        type: String,
-        value: 'input,textarea,.paper-input-input'
-      },
-
-      _boundOnFocus: {
-        type: Function,
-        value: function() {
-          return this._onFocus.bind(this);
-        }
-      },
-
-      _boundOnBlur: {
-        type: Function,
-        value: function() {
-          return this._onBlur.bind(this);
-        }
-      },
-
-      _boundOnInput: {
-        type: Function,
-        value: function() {
-          return this._onInput.bind(this);
-        }
-      },
-
-      _boundValueChanged: {
-        type: Function,
-        value: function() {
-          return this._onValueChanged.bind(this);
-        }
-      }
-    },
-
-    listeners: {
-      'addon-attached': '_onAddonAttached',
-      'iron-input-validate': '_onIronInputValidate'
-    },
-
-    get _valueChangedEvent() {
-      return this.attrForValue + '-changed';
-    },
-
-    get _propertyForValue() {
-      return Polymer.CaseMap.dashToCamelCase(this.attrForValue);
-    },
-
-    get _inputElement() {
-      return Polymer.dom(this).querySelector(this._inputSelector);
-    },
-
-    get _inputElementValue() {
-      return this._inputElement[this._propertyForValue] || this._inputElement.value;
-    },
-
-    ready: function() {
-      if (!this._addons) {
-        this._addons = [];
-      }
-      this.addEventListener('focus', this._boundOnFocus, true);
-      this.addEventListener('blur', this._boundOnBlur, true);
-    },
-
-    attached: function() {
-      if (this.attrForValue) {
-        this._inputElement.addEventListener(this._valueChangedEvent, this._boundValueChanged);
-      } else {
-        this.addEventListener('input', this._onInput);
-      }
-
-      // Only validate when attached if the input already has a value.
-      if (this._inputElementValue != '') {
-        this._handleValueAndAutoValidate(this._inputElement);
-      } else {
-        this._handleValue(this._inputElement);
-      }
-    },
-
-    _onAddonAttached: function(event) {
-      if (!this._addons) {
-        this._addons = [];
-      }
-      var target = event.target;
-      if (this._addons.indexOf(target) === -1) {
-        this._addons.push(target);
-        if (this.isAttached) {
-          this._handleValue(this._inputElement);
-        }
-      }
-    },
-
-    _onFocus: function() {
-      this._setFocused(true);
-    },
-
-    _onBlur: function() {
-      this._setFocused(false);
-      this._handleValueAndAutoValidate(this._inputElement);
-    },
-
-    _onInput: function(event) {
-      this._handleValueAndAutoValidate(event.target);
-    },
-
-    _onValueChanged: function(event) {
-      this._handleValueAndAutoValidate(event.target);
-    },
-
-    _handleValue: function(inputElement) {
-      var value = this._inputElementValue;
-
-      // type="number" hack needed because this.value is empty until it's valid
-      if (value || value === 0 || (inputElement.type === 'number' && !inputElement.checkValidity())) {
-        this._inputHasContent = true;
-      } else {
-        this._inputHasContent = false;
-      }
-
+    }
+    this._handleValue(inputElement);
+  },
+  _onIronInputValidate: function(event) {
+    this.invalid = this._inputElement.invalid;
+  },
+  _invalidChanged: function() {
+    if (this._addons) {
       this.updateAddons({
-        inputElement: inputElement,
-        value: value,
         invalid: this.invalid
       });
-    },
-
-    _handleValueAndAutoValidate: function(inputElement) {
-      if (this.autoValidate) {
-        var valid;
-        if (inputElement.validate) {
-          valid = inputElement.validate(this._inputElementValue);
-        } else {
-          valid = inputElement.checkValidity();
-        }
-        this.invalid = !valid;
-      }
-
-      // Call this last to notify the add-ons.
-      this._handleValue(inputElement);
-    },
-
-    _onIronInputValidate: function(event) {
-      this.invalid = this._inputElement.invalid;
-    },
-
-    _invalidChanged: function() {
-      if (this._addons) {
-        this.updateAddons({invalid: this.invalid});
-      }
-    },
-
-    /**
-     * Call this to update the state of add-ons.
-     * @param {Object} state Add-on state.
-     */
-    updateAddons: function(state) {
-      for (var addon, index = 0; addon = this._addons[index]; index++) {
-        addon.update(state);
-      }
-    },
-
-    _computeInputContentClass: function(noLabelFloat, alwaysFloatLabel, focused, invalid, _inputHasContent) {
-      var cls = 'input-content';
-      if (!noLabelFloat) {
-        var label = this.querySelector('label');
-
-        if (alwaysFloatLabel || _inputHasContent) {
-          cls += ' label-is-floating';
-          // If the label is floating, ignore any offsets that may have been
-          // applied from a prefix element.
-          this.$.labelAndInputContainer.style.position = 'static';
-
-          if (invalid) {
-            cls += ' is-invalid';
-          } else if (focused) {
-            cls += " label-is-highlighted";
-          }
-        } else {
-          // When the label is not floating, it should overlap the input element.
-          if (label) {
-            this.$.labelAndInputContainer.style.position = 'relative';
-          }
+    }
+  },
+  updateAddons: function(state) {
+    for (var addon, index = 0; addon = this._addons[index]; index++) {
+      addon.update(state);
+    }
+  },
+  _computeInputContentClass: function(noLabelFloat, alwaysFloatLabel, focused, invalid, _inputHasContent) {
+    var cls = 'input-content';
+    if (!noLabelFloat) {
+      var label = this.querySelector('label');
+      if (alwaysFloatLabel || _inputHasContent) {
+        cls += ' label-is-floating';
+        this.$.labelAndInputContainer.style.position = 'static';
+        if (invalid) {
+          cls += ' is-invalid';
+        } else if (focused) {
+          cls += " label-is-highlighted";
         }
       } else {
-        if (_inputHasContent) {
-          cls += ' label-is-hidden';
+        if (label) {
+          this.$.labelAndInputContainer.style.position = 'relative';
         }
       }
-      return cls;
-    },
-
-    _computeUnderlineClass: function(focused, invalid) {
-      var cls = 'underline';
-      if (invalid) {
-        cls += ' is-invalid';
-      } else if (focused) {
-        cls += ' is-highlighted'
-      }
-      return cls;
-    },
-
-    _computeAddOnContentClass: function(focused, invalid) {
-      var cls = 'add-on-content';
-      if (invalid) {
-        cls += ' is-invalid';
-      } else if (focused) {
-        cls += ' is-highlighted'
-      }
-      return cls;
-    }
-  });
-/** @polymerBehavior */
-  Polymer.PaperSpinnerBehavior = {
-
-    listeners: {
-      'animationend': '__reset',
-      'webkitAnimationEnd': '__reset'
-    },
-
-    properties: {
-      /**
-       * Displays the spinner.
-       */
-      active: {
-        type: Boolean,
-        value: false,
-        reflectToAttribute: true,
-        observer: '__activeChanged'
-      },
-
-      /**
-       * Alternative text content for accessibility support.
-       * If alt is present, it will add an aria-label whose content matches alt when active.
-       * If alt is not present, it will default to 'loading' as the alt value.
-       */
-      alt: {
-        type: String,
-        value: 'loading',
-        observer: '__altChanged'
-      },
-
-      __coolingDown: {
-        type: Boolean,
-        value: false
-      }
-    },
-
-    __computeContainerClasses: function(active, coolingDown) {
-      return [
-        active || coolingDown ? 'active' : '',
-        coolingDown ? 'cooldown' : ''
-      ].join(' ');
-    },
-
-    __activeChanged: function(active, old) {
-      this.__setAriaHidden(!active);
-      this.__coolingDown = !active && old;
-    },
-
-    __altChanged: function(alt) {
-      // user-provided `aria-label` takes precedence over prototype default
-      if (alt === this.getPropertyInfo('alt').value) {
-        this.alt = this.getAttribute('aria-label') || alt;
-      } else {
-        this.__setAriaHidden(alt==='');
-        this.setAttribute('aria-label', alt);
-      }
-    },
-
-    __setAriaHidden: function(hidden) {
-      var attr = 'aria-hidden';
-      if (hidden) {
-        this.setAttribute(attr, 'true');
-      } else {
-        this.removeAttribute(attr);
-      }
-    },
-
-    __reset: function() {
-      this.active = false;
-      this.__coolingDown = false;
-    }
-  };
+    } else {
+      if (_inputHasContent) {
+        cls += ' label-is-hidden';
+      }
+    }
+    return cls;
+  },
+  _computeUnderlineClass: function(focused, invalid) {
+    var cls = 'underline';
+    if (invalid) {
+      cls += ' is-invalid';
+    } else if (focused) {
+      cls += ' is-highlighted';
+    }
+    return cls;
+  },
+  _computeAddOnContentClass: function(focused, invalid) {
+    var cls = 'add-on-content';
+    if (invalid) {
+      cls += ' is-invalid';
+    } else if (focused) {
+      cls += ' is-highlighted';
+    }
+    return cls;
+  }
+});
+
+Polymer.PaperSpinnerBehavior = {
+  listeners: {
+    animationend: '__reset',
+    webkitAnimationEnd: '__reset'
+  },
+  properties: {
+    active: {
+      type: Boolean,
+      value: false,
+      reflectToAttribute: true,
+      observer: '__activeChanged'
+    },
+    alt: {
+      type: String,
+      value: 'loading',
+      observer: '__altChanged'
+    },
+    __coolingDown: {
+      type: Boolean,
+      value: false
+    }
+  },
+  __computeContainerClasses: function(active, coolingDown) {
+    return [ active || coolingDown ? 'active' : '', coolingDown ? 'cooldown' : '' ].join(' ');
+  },
+  __activeChanged: function(active, old) {
+    this.__setAriaHidden(!active);
+    this.__coolingDown = !active && old;
+  },
+  __altChanged: function(alt) {
+    if (alt === this.getPropertyInfo('alt').value) {
+      this.alt = this.getAttribute('aria-label') || alt;
+    } else {
+      this.__setAriaHidden(alt === '');
+      this.setAttribute('aria-label', alt);
+    }
+  },
+  __setAriaHidden: function(hidden) {
+    var attr = 'aria-hidden';
+    if (hidden) {
+      this.setAttribute(attr, 'true');
+    } else {
+      this.removeAttribute(attr);
+    }
+  },
+  __reset: function() {
+    this.active = false;
+    this.__coolingDown = false;
+  }
+};
+
 Polymer({
-      is: 'paper-spinner-lite',
-
-      behaviors: [
-        Polymer.PaperSpinnerBehavior
-      ]
-    });
+  is: 'paper-spinner-lite',
+  behaviors: [ Polymer.PaperSpinnerBehavior ]
+});
+
 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
-/**
- * Implements an incremental search field which can be shown and hidden.
- * Canonical implementation is <cr-search-field>.
- * @polymerBehavior
- */
 var CrSearchFieldBehavior = {
   properties: {
     label: {
       type: String,
-      value: '',
-    },
-
+      value: ''
+    },
     clearLabel: {
       type: String,
-      value: '',
-    },
-
+      value: ''
+    },
     showingSearch: {
       type: Boolean,
       value: false,
       notify: true,
       observer: 'showingSearchChanged_',
       reflectToAttribute: true
     },
-
-    /** @private */
     lastValue_: {
       type: String,
-      value: '',
-    },
-  },
-
-  /**
-   * @abstract
-   * @return {!HTMLInputElement} The input field element the behavior should
-   * use.
-   */
+      value: ''
+    }
+  },
   getSearchInput: function() {},
-
-  /**
-   * @return {string} The value of the search field.
-   */
   getValue: function() {
     return this.getSearchInput().value;
   },
-
-  /**
-   * Sets the value of the search field.
-   * @param {string} value
-   */
   setValue: function(value) {
-    // Use bindValue when setting the input value so that changes propagate
-    // correctly.
     this.getSearchInput().bindValue = value;
     this.onValueChanged_(value);
   },
-
   showAndFocus: function() {
     this.showingSearch = true;
     this.focus_();
   },
-
-  /** @private */
   focus_: function() {
     this.getSearchInput().focus();
   },
-
   onSearchTermSearch: function() {
     this.onValueChanged_(this.getValue());
   },
-
-  /**
-   * Updates the internal state of the search field based on a change that has
-   * already happened.
-   * @param {string} newValue
-   * @private
-   */
   onValueChanged_: function(newValue) {
-    if (newValue == this.lastValue_)
-      return;
-
+    if (newValue == this.lastValue_) return;
     this.fire('search-changed', newValue);
     this.lastValue_ = newValue;
   },
-
   onSearchTermKeydown: function(e) {
-    if (e.key == 'Escape')
-      this.showingSearch = false;
-  },
-
-  /** @private */
+    if (e.key == 'Escape') this.showingSearch = false;
+  },
   showingSearchChanged_: function() {
     if (this.showingSearch) {
       this.focus_();
       return;
     }
-
     this.setValue('');
     this.getSearchInput().blur();
   }
 };
+
 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
-// TODO(tsergeant): Add tests for cr-toolbar-search-field.
 Polymer({
   is: 'cr-toolbar-search-field',
-
-  behaviors: [CrSearchFieldBehavior],
-
+  behaviors: [ CrSearchFieldBehavior ],
   properties: {
     narrow: {
       type: Boolean,
-      reflectToAttribute: true,
-    },
-
-    // Prompt text to display in the search field.
+      reflectToAttribute: true
+    },
     label: String,
-
-    // Tooltip to display on the clear search button.
     clearLabel: String,
-
-    // When true, show a loading spinner to indicate that the backend is
-    // processing the search. Will only show if the search field is open.
     spinnerActive: {
       type: Boolean,
       reflectToAttribute: true
     },
-
-    /** @private */
-    hasSearchText_: Boolean,
-  },
-
+    hasSearchText_: Boolean
+  },
   listeners: {
-    'tap': 'showSearch_',
-    'searchInput.bind-value-changed': 'onBindValueChanged_',
-  },
-
-  /** @return {!HTMLInputElement} */
+    tap: 'showSearch_',
+    'searchInput.bind-value-changed': 'onBindValueChanged_'
+  },
   getSearchInput: function() {
     return this.$.searchInput;
   },
-
-  /** @return {boolean} */
   isSearchFocused: function() {
     return this.$.searchTerm.focused;
   },
-
-  /**
-   * @param {boolean} narrow
-   * @return {number}
-   * @private
-   */
   computeIconTabIndex_: function(narrow) {
     return narrow ? 0 : -1;
   },
-
-  /**
-   * @param {boolean} spinnerActive
-   * @param {boolean} showingSearch
-   * @return {boolean}
-   * @private
-   */
   isSpinnerShown_: function(spinnerActive, showingSearch) {
     return spinnerActive && showingSearch;
   },
-
-  /** @private */
   onInputBlur_: function() {
-    if (!this.hasSearchText_)
-      this.showingSearch = false;
-  },
-
-  /**
-   * Update the state of the search field whenever the underlying input value
-   * changes. Unlike onsearch or onkeypress, this is reliably called immediately
-   * after any change, whether the result of user input or JS modification.
-   * @private
-   */
+    if (!this.hasSearchText_) this.showingSearch = false;
+  },
   onBindValueChanged_: function() {
     var newValue = this.$.searchInput.bindValue;
     this.hasSearchText_ = newValue != '';
-    if (newValue != '')
-      this.showingSearch = true;
-  },
-
-  /**
-   * @param {Event} e
-   * @private
-   */
+    if (newValue != '') this.showingSearch = true;
+  },
   showSearch_: function(e) {
-    if (e.target != this.$.clearSearch)
-      this.showingSearch = true;
-  },
-
-  /**
-   * @param {Event} e
-   * @private
-   */
+    if (e.target != this.$.clearSearch) this.showingSearch = true;
+  },
   hideSearch_: function(e) {
     this.showingSearch = false;
     e.stopPropagation();
   }
 });
+
 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
 Polymer({
   is: 'cr-toolbar',
-
   properties: {
-    // Name to display in the toolbar, in titlecase.
     pageName: String,
-
-    // Prompt text to display in the search field.
     searchPrompt: String,
-
-    // Tooltip to display on the clear search button.
     clearLabel: String,
-
-    // Tooltip to display on the menu button.
     menuLabel: String,
-
-    // Value is proxied through to cr-toolbar-search-field. When true,
-    // the search field will show a processing spinner.
     spinnerActive: Boolean,
-
-    // Controls whether the menu button is shown at the start of the menu.
     showMenu: {
       type: Boolean,
       reflectToAttribute: true,
       value: true
     },
-
-    /** @private */
     narrow_: {
       type: Boolean,
       reflectToAttribute: true
     },
-
-    /** @private */
     showingSearch_: {
       type: Boolean,
-      reflectToAttribute: true,
-    },
-  },
-
-  /** @return {!CrToolbarSearchFieldElement} */
+      reflectToAttribute: true
+    }
+  },
   getSearchField: function() {
     return this.$.search;
   },
-
-  /** @private */
   onMenuTap_: function(e) {
     this.fire('cr-menu-tap');
   }
 });
+
 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
 Polymer({
   is: 'history-toolbar',
   properties: {
-    // Number of history items currently selected.
-    // TODO(calamity): bind this to
-    // listContainer.selectedItem.selectedPaths.length.
     count: {
       type: Number,
       value: 0,
       observer: 'changeToolbarView_'
     },
-
-    // True if 1 or more history items are selected. When this value changes
-    // the background colour changes.
     itemsSelected_: {
       type: Boolean,
       value: false,
       reflectToAttribute: true
     },
-
-    // The most recent term entered in the search field. Updated incrementally
-    // as the user types.
     searchTerm: {
       type: String,
-      notify: true,
-    },
-
-    // True if the backend is processing and a spinner should be shown in the
-    // toolbar.
+      notify: true
+    },
     spinnerActive: {
       type: Boolean,
       value: false
     },
-
     hasDrawer: {
       type: Boolean,
       observer: 'hasDrawerChanged_',
-      reflectToAttribute: true,
-    },
-
-    // Whether domain-grouped history is enabled.
+      reflectToAttribute: true
+    },
     isGroupedMode: {
       type: Boolean,
-      reflectToAttribute: true,
-    },
-
-    // The period to search over. Matches BrowsingHistoryHandler::Range.
+      reflectToAttribute: true
+    },
     groupedRange: {
       type: Number,
       value: 0,
       reflectToAttribute: true,
       notify: true
     },
-
-    // The start time of the query range.
     queryStartTime: String,
-
-    // The end time of the query range.
-    queryEndTime: String,
-  },
-
-  /**
-   * Changes the toolbar background color depending on whether any history items
-   * are currently selected.
-   * @private
-   */
+    queryEndTime: String
+  },
   changeToolbarView_: function() {
     this.itemsSelected_ = this.count > 0;
   },
-
-  /**
-   * When changing the search term externally, update the search field to
-   * reflect the new search term.
-   * @param {string} search
-   */
   setSearchTerm: function(search) {
-    if (this.searchTerm == search)
-      return;
-
+    if (this.searchTerm == search) return;
     this.searchTerm = search;
-    var searchField = /** @type {!CrToolbarElement} */(this.$['main-toolbar'])
-                          .getSearchField();
+    var searchField = this.$['main-toolbar'].getSearchField();
     searchField.showAndFocus();
     searchField.setValue(search);
   },
-
-  /**
-   * @param {!CustomEvent} event
-   * @private
-   */
   onSearchChanged_: function(event) {
-    this.searchTerm = /** @type {string} */ (event.detail);
-  },
-
+    this.searchTerm = event.detail;
+  },
   onClearSelectionTap_: function() {
     this.fire('unselect-all');
   },
-
   onDeleteTap_: function() {
     this.fire('delete-selected');
   },
-
   get searchBar() {
     return this.$['main-toolbar'].getSearchField();
   },
-
   showSearchField: function() {
-    /** @type {!CrToolbarElement} */(this.$['main-toolbar'])
-        .getSearchField()
-        .showAndFocus();
-  },
-
-  /**
-   * If the user is a supervised user the delete button is not shown.
-   * @private
-   */
+    this.$['main-toolbar'].getSearchField().showAndFocus();
+  },
   deletingAllowed_: function() {
     return loadTimeData.getBoolean('allowDeletingHistory');
   },
-
   numberOfItemsSelected_: function(count) {
     return count > 0 ? loadTimeData.getStringF('itemsSelected', count) : '';
   },
-
   getHistoryInterval_: function(queryStartTime, queryEndTime) {
-    // TODO(calamity): Fix the format of these dates.
-    return loadTimeData.getStringF(
-      'historyInterval', queryStartTime, queryEndTime);
-  },
-
-  /** @private */
+    return loadTimeData.getStringF('historyInterval', queryStartTime, queryEndTime);
+  },
   hasDrawerChanged_: function() {
     this.updateStyles();
-  },
+  }
 });
+
 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
-/**
- * @fileoverview 'cr-dialog' is a component for showing a modal dialog. If the
- * dialog is closed via close(), a 'close' event is fired. If the dialog is
- * canceled via cancel(), a 'cancel' event is fired followed by a 'close' event.
- * Additionally clients can inspect the dialog's |returnValue| property inside
- * the 'close' event listener to determine whether it was canceled or just
- * closed, where a truthy value means success, and a falsy value means it was
- * canceled.
- */
 Polymer({
   is: 'cr-dialog',
-  extends: 'dialog',
-
-  /** @override */
+  "extends": 'dialog',
   created: function() {
-    // If the active history entry changes (i.e. user clicks back button),
-    // all open dialogs should be cancelled.
     window.addEventListener('popstate', function() {
-      if (this.open)
-        this.cancel();
+      if (this.open) this.cancel();
     }.bind(this));
   },
-
   cancel: function() {
     this.fire('cancel');
     HTMLDialogElement.prototype.close.call(this, '');
   },
-
-  /**
-   * @param {string=} opt_returnValue
-   * @override
-   */
   close: function(opt_returnValue) {
     HTMLDialogElement.prototype.close.call(this, 'success');
   },
-
-  /** @return {!PaperIconButtonElement} */
   getCloseButton: function() {
     return this.$.close;
-  },
+  }
 });
-/**
-`Polymer.IronFitBehavior` fits an element in another element using `max-height` and `max-width`, and
-optionally centers it in the window or another element.
 
-The element will only be sized and/or positioned if it has not already been sized and/or positioned
-by CSS.
+Polymer.IronFitBehavior = {
+  properties: {
+    sizingTarget: {
+      type: Object,
+      value: function() {
+        return this;
+      }
+    },
+    fitInto: {
+      type: Object,
+      value: window
+    },
+    noOverlap: {
+      type: Boolean
+    },
+    positionTarget: {
+      type: Element
+    },
+    horizontalAlign: {
+      type: String
+    },
+    verticalAlign: {
+      type: String
+    },
+    dynamicAlign: {
+      type: Boolean
+    },
+    horizontalOffset: {
+      type: Number,
+      value: 0,
+      notify: true
+    },
+    verticalOffset: {
+      type: Number,
+      value: 0,
+      notify: true
+    },
+    autoFitOnAttach: {
+      type: Boolean,
+      value: false
+    },
+    _fitInfo: {
+      type: Object
+    }
+  },
+  get _fitWidth() {
+    var fitWidth;
+    if (this.fitInto === window) {
+      fitWidth = this.fitInto.innerWidth;
+    } else {
+      fitWidth = this.fitInto.getBoundingClientRect().width;
+    }
+    return fitWidth;
+  },
+  get _fitHeight() {
+    var fitHeight;
+    if (this.fitInto === window) {
+      fitHeight = this.fitInto.innerHeight;
+    } else {
+      fitHeight = this.fitInto.getBoundingClientRect().height;
+    }
+    return fitHeight;
+  },
+  get _fitLeft() {
+    var fitLeft;
+    if (this.fitInto === window) {
+      fitLeft = 0;
+    } else {
+      fitLeft = this.fitInto.getBoundingClientRect().left;
+    }
+    return fitLeft;
+  },
+  get _fitTop() {
+    var fitTop;
+    if (this.fitInto === window) {
+      fitTop = 0;
+    } else {
+      fitTop = this.fitInto.getBoundingClientRect().top;
+    }
+    return fitTop;
+  },
+  get _defaultPositionTarget() {
+    var parent = Polymer.dom(this).parentNode;
+    if (parent && parent.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {
+      parent = parent.host;
+    }
+    return parent;
+  },
+  get _localeHorizontalAlign() {
+    if (this._isRTL) {
+      if (this.horizontalAlign === 'right') {
+        return 'left';
+      }
+      if (this.horizontalAlign === 'left') {
+        return 'right';
+      }
+    }
+    return this.horizontalAlign;
+  },
+  attached: function() {
+    this._isRTL = window.getComputedStyle(this).direction == 'rtl';
+    this.positionTarget = this.positionTarget || this._defaultPositionTarget;
+    if (this.autoFitOnAttach) {
+      if (window.getComputedStyle(this).display === 'none') {
+        setTimeout(function() {
+          this.fit();
+        }.bind(this));
+      } else {
+        this.fit();
+      }
+    }
+  },
+  fit: function() {
+    this.position();
+    this.constrain();
+    this.center();
+  },
+  _discoverInfo: function() {
+    if (this._fitInfo) {
+      return;
+    }
+    var target = window.getComputedStyle(this);
+    var sizer = window.getComputedStyle(this.sizingTarget);
+    this._fitInfo = {
+      inlineStyle: {
+        top: this.style.top || '',
+        left: this.style.left || '',
+        position: this.style.position || ''
+      },
+      sizerInlineStyle: {
+        maxWidth: this.sizingTarget.style.maxWidth || '',
+        maxHeight: this.sizingTarget.style.maxHeight || '',
+        boxSizing: this.sizingTarget.style.boxSizing || ''
+      },
+      positionedBy: {
+        vertically: target.top !== 'auto' ? 'top' : target.bottom !== 'auto' ? 'bottom' : null,
+        horizontally: target.left !== 'auto' ? 'left' : target.right !== 'auto' ? 'right' : null
+      },
+      sizedBy: {
+        height: sizer.maxHeight !== 'none',
+        width: sizer.maxWidth !== 'none',
+        minWidth: parseInt(sizer.minWidth, 10) || 0,
+        minHeight: parseInt(sizer.minHeight, 10) || 0
+      },
+      margin: {
+        top: parseInt(target.marginTop, 10) || 0,
+        right: parseInt(target.marginRight, 10) || 0,
+        bottom: parseInt(target.marginBottom, 10) || 0,
+        left: parseInt(target.marginLeft, 10) || 0
+      }
+    };
+    if (this.verticalOffset) {
+      this._fitInfo.margin.top = this._fitInfo.margin.bottom = this.verticalOffset;
+      this._fitInfo.inlineStyle.marginTop = this.style.marginTop || '';
+      this._fitInfo.inlineStyle.marginBottom = this.style.marginBottom || '';
+      this.style.marginTop = this.style.marginBottom = this.verticalOffset + 'px';
+    }
+    if (this.horizontalOffset) {
+      this._fitInfo.margin.left = this._fitInfo.margin.right = this.horizontalOffset;
+      this._fitInfo.inlineStyle.marginLeft = this.style.marginLeft || '';
+      this._fitInfo.inlineStyle.marginRight = this.style.marginRight || '';
+      this.style.marginLeft = this.style.marginRight = this.horizontalOffset + 'px';
+    }
+  },
+  resetFit: function() {
+    var info = this._fitInfo || {};
+    for (var property in info.sizerInlineStyle) {
+      this.sizingTarget.style[property] = info.sizerInlineStyle[property];
+    }
+    for (var property in info.inlineStyle) {
+      this.style[property] = info.inlineStyle[property];
+    }
+    this._fitInfo = null;
+  },
+  refit: function() {
+    var scrollLeft = this.sizingTarget.scrollLeft;
+    var scrollTop = this.sizingTarget.scrollTop;
+    this.resetFit();
+    this.fit();
+    this.sizingTarget.scrollLeft = scrollLeft;
+    this.sizingTarget.scrollTop = scrollTop;
+  },
+  position: function() {
+    if (!this.horizontalAlign && !this.verticalAlign) {
+      return;
+    }
+    this._discoverInfo();
+    this.style.position = 'fixed';
+    this.sizingTarget.style.boxSizing = 'border-box';
+    this.style.left = '0px';
+    this.style.top = '0px';
+    var rect = this.getBoundingClientRect();
+    var positionRect = this.__getNormalizedRect(this.positionTarget);
+    var fitRect = this.__getNormalizedRect(this.fitInto);
+    var margin = this._fitInfo.margin;
+    var size = {
+      width: rect.width + margin.left + margin.right,
+      height: rect.height + margin.top + margin.bottom
+    };
+    var position = this.__getPosition(this._localeHorizontalAlign, this.verticalAlign, size, positionRect, fitRect);
+    var left = position.left + margin.left;
+    var top = position.top + margin.top;
+    var right = Math.min(fitRect.right - margin.right, left + rect.width);
+    var bottom = Math.min(fitRect.bottom - margin.bottom, top + rect.height);
+    var minWidth = this._fitInfo.sizedBy.minWidth;
+    var minHeight = this._fitInfo.sizedBy.minHeight;
+    if (left < margin.left) {
+      left = margin.left;
+      if (right - left < minWidth) {
+        left = right - minWidth;
+      }
+    }
+    if (top < margin.top) {
+      top = margin.top;
+      if (bottom - top < minHeight) {
+        top = bottom - minHeight;
+      }
+    }
+    this.sizingTarget.style.maxWidth = right - left + 'px';
+    this.sizingTarget.style.maxHeight = bottom - top + 'px';
+    this.style.left = left - rect.left + 'px';
+    this.style.top = top - rect.top + 'px';
+  },
+  constrain: function() {
+    if (this.horizontalAlign || this.verticalAlign) {
+      return;
+    }
+    this._discoverInfo();
+    var info = this._fitInfo;
+    if (!info.positionedBy.vertically) {
+      this.style.position = 'fixed';
+      this.style.top = '0px';
+    }
+    if (!info.positionedBy.horizontally) {
+      this.style.position = 'fixed';
+      this.style.left = '0px';
+    }
+    this.sizingTarget.style.boxSizing = 'border-box';
+    var rect = this.getBoundingClientRect();
+    if (!info.sizedBy.height) {
+      this.__sizeDimension(rect, info.positionedBy.vertically, 'top', 'bottom', 'Height');
+    }
+    if (!info.sizedBy.width) {
+      this.__sizeDimension(rect, info.positionedBy.horizontally, 'left', 'right', 'Width');
+    }
+  },
+  _sizeDimension: function(rect, positionedBy, start, end, extent) {
+    this.__sizeDimension(rect, positionedBy, start, end, extent);
+  },
+  __sizeDimension: function(rect, positionedBy, start, end, extent) {
+    var info = this._fitInfo;
+    var fitRect = this.__getNormalizedRect(this.fitInto);
+    var max = extent === 'Width' ? fitRect.width : fitRect.height;
+    var flip = positionedBy === end;
+    var offset = flip ? max - rect[end] : rect[start];
+    var margin = info.margin[flip ? start : end];
+    var offsetExtent = 'offset' + extent;
+    var sizingOffset = this[offsetExtent] - this.sizingTarget[offsetExtent];
+    this.sizingTarget.style['max' + extent] = max - margin - offset - sizingOffset + 'px';
+  },
+  center: function() {
+    if (this.horizontalAlign || this.verticalAlign) {
+      return;
+    }
+    this._discoverInfo();
+    var positionedBy = this._fitInfo.positionedBy;
+    if (positionedBy.vertically && positionedBy.horizontally) {
+      return;
+    }
+    this.style.position = 'fixed';
+    if (!positionedBy.vertically) {
+      this.style.top = '0px';
+    }
+    if (!positionedBy.horizontally) {
+      this.style.left = '0px';
+    }
+    var rect = this.getBoundingClientRect();
+    var fitRect = this.__getNormalizedRect(this.fitInto);
+    if (!positionedBy.vertically) {
+      var top = fitRect.top - rect.top + (fitRect.height - rect.height) / 2;
+      this.style.top = top + 'px';
+    }
+    if (!positionedBy.horizontally) {
+      var left = fitRect.left - rect.left + (fitRect.width - rect.width) / 2;
+      this.style.left = left + 'px';
+    }
+  },
+  __getNormalizedRect: function(target) {
+    if (target === document.documentElement || target === window) {
+      return {
+        top: 0,
+        left: 0,
+        width: window.innerWidth,
+        height: window.innerHeight,
+        right: window.innerWidth,
+        bottom: window.innerHeight
+      };
+    }
+    return target.getBoundingClientRect();
+  },
+  __getCroppedArea: function(position, size, fitRect) {
+    var verticalCrop = Math.min(0, position.top) + Math.min(0, fitRect.bottom - (position.top + size.height));
+    var horizontalCrop = Math.min(0, position.left) + Math.min(0, fitRect.right - (position.left + size.width));
+    return Math.abs(verticalCrop) * size.width + Math.abs(horizontalCrop) * size.height;
+  },
+  __getPosition: function(hAlign, vAlign, size, positionRect, fitRect) {
+    var positions = [ {
+      verticalAlign: 'top',
+      horizontalAlign: 'left',
+      top: positionRect.top,
+      left: positionRect.left
+    }, {
+      verticalAlign: 'top',
+      horizontalAlign: 'right',
+      top: positionRect.top,
+      left: positionRect.right - size.width
+    }, {
+      verticalAlign: 'bottom',
+      horizontalAlign: 'left',
+      top: positionRect.bottom - size.height,
+      left: positionRect.left
+    }, {
+      verticalAlign: 'bottom',
+      horizontalAlign: 'right',
+      top: positionRect.bottom - size.height,
+      left: positionRect.right - size.width
+    } ];
+    if (this.noOverlap) {
+      for (var i = 0, l = positions.length; i < l; i++) {
+        var copy = {};
+        for (var key in positions[i]) {
+          copy[key] = positions[i][key];
+        }
+        positions.push(copy);
+      }
+      positions[0].top = positions[1].top += positionRect.height;
+      positions[2].top = positions[3].top -= positionRect.height;
+      positions[4].left = positions[6].left += positionRect.width;
+      positions[5].left = positions[7].left -= positionRect.width;
+    }
+    vAlign = vAlign === 'auto' ? null : vAlign;
+    hAlign = hAlign === 'auto' ? null : hAlign;
+    var position;
+    for (var i = 0; i < positions.length; i++) {
+      var pos = positions[i];
+      if (!this.dynamicAlign && !this.noOverlap && pos.verticalAlign === vAlign && pos.horizontalAlign === hAlign) {
+        position = pos;
+        break;
+      }
+      var alignOk = (!vAlign || pos.verticalAlign === vAlign) && (!hAlign || pos.horizontalAlign === hAlign);
+      if (!this.dynamicAlign && !alignOk) {
+        continue;
+      }
+      position = position || pos;
+      pos.croppedArea = this.__getCroppedArea(pos, size, fitRect);
+      var diff = pos.croppedArea - position.croppedArea;
+      if (diff < 0 || diff === 0 && alignOk) {
+        position = pos;
+      }
+      if (position.croppedArea === 0 && alignOk) {
+        break;
+      }
+    }
+    return position;
+  }
+};
 
-CSS properties               | Action
------------------------------|-------------------------------------------
-`position` set               | Element is not centered horizontally or vertically
-`top` or `bottom` set        | Element is not vertically centered
-`left` or `right` set        | Element is not horizontally centered
-`max-height` set             | Element respects `max-height`
-`max-width` set              | Element respects `max-width`
-
-`Polymer.IronFitBehavior` can position an element into another element using
-`verticalAlign` and `horizontalAlign`. This will override the element's css position.
-
-      <div class="container">
-        <iron-fit-impl vertical-align="top" horizontal-align="auto">
-          Positioned into the container
-        </iron-fit-impl>
-      </div>
-
-Use `noOverlap` to position the element around another element without overlapping it.
-
-      <div class="container">
-        <iron-fit-impl no-overlap vertical-align="auto" horizontal-align="auto">
-          Positioned around the container
-        </iron-fit-impl>
-      </div>
-
-@demo demo/index.html
-@polymerBehavior
-*/
-
-  Polymer.IronFitBehavior = {
-
+(function() {
+  'use strict';
+  Polymer({
+    is: 'iron-overlay-backdrop',
     properties: {
-
-      /**
-       * The element that will receive a `max-height`/`width`. By default it is the same as `this`,
-       * but it can be set to a child element. This is useful, for example, for implementing a
-       * scrolling region inside the element.
-       * @type {!Element}
-       */
-      sizingTarget: {
-        type: Object,
-        value: function() {
-          return this;
-        }
-      },
-
-      /**
-       * The element to fit `this` into.
-       */
-      fitInto: {
-        type: Object,
-        value: window
-      },
-
-      /**
-       * Will position the element around the positionTarget without overlapping it.
-       */
-      noOverlap: {
-        type: Boolean
-      },
-
-      /**
-       * The element that should be used to position the element. If not set, it will
-       * default to the parent node.
-       * @type {!Element}
-       */
-      positionTarget: {
-        type: Element
-      },
-
-      /**
-       * The orientation against which to align the element horizontally
-       * relative to the `positionTarget`. Possible values are "left", "right", "auto".
-       */
-      horizontalAlign: {
-        type: String
-      },
-
-      /**
-       * The orientation against which to align the element vertically
-       * relative to the `positionTarget`. Possible values are "top", "bottom", "auto".
-       */
-      verticalAlign: {
-        type: String
-      },
-
-      /**
-       * If true, it will use `horizontalAlign` and `verticalAlign` values as preferred alignment
-       * and if there's not enough space, it will pick the values which minimize the cropping.
-       */
-      dynamicAlign: {
-        type: Boolean
-      },
-
-      /**
-       * The same as setting margin-left and margin-right css properties.
-       * @deprecated
-       */
-      horizontalOffset: {
-        type: Number,
-        value: 0,
-        notify: true
-      },
-
-      /**
-       * The same as setting margin-top and margin-bottom css properties.
-       * @deprecated
-       */
-      verticalOffset: {
-        type: Number,
-        value: 0,
-        notify: true
-      },
-
-      /**
-       * Set to true to auto-fit on attach.
-       */
-      autoFitOnAttach: {
-        type: Boolean,
-        value: false
-      },
-
-      /** @type {?Object} */
-      _fitInfo: {
-        type: Object
-      }
-    },
-
-    get _fitWidth() {
-      var fitWidth;
-      if (this.fitInto === window) {
-        fitWidth = this.fitInto.innerWidth;
-      } else {
-        fitWidth = this.fitInto.getBoundingClientRect().width;
-      }
-      return fitWidth;
-    },
-
-    get _fitHeight() {
-      var fitHeight;
-      if (this.fitInto === window) {
-        fitHeight = this.fitInto.innerHeight;
-      } else {
-        fitHeight = this.fitInto.getBoundingClientRect().height;
-      }
-      return fitHeight;
-    },
-
-    get _fitLeft() {
-      var fitLeft;
-      if (this.fitInto === window) {
-        fitLeft = 0;
-      } else {
-        fitLeft = this.fitInto.getBoundingClientRect().left;
-      }
-      return fitLeft;
-    },
-
-    get _fitTop() {
-      var fitTop;
-      if (this.fitInto === window) {
-        fitTop = 0;
-      } else {
-        fitTop = this.fitInto.getBoundingClientRect().top;
-      }
-      return fitTop;
-    },
-
-    /**
-     * The element that should be used to position the element,
-     * if no position target is configured.
-     */
-    get _defaultPositionTarget() {
-      var parent = Polymer.dom(this).parentNode;
-
-      if (parent && parent.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {
-        parent = parent.host;
-      }
-
-      return parent;
-    },
-
-    /**
-     * The horizontal align value, accounting for the RTL/LTR text direction.
-     */
-    get _localeHorizontalAlign() {
-      if (this._isRTL) {
-        // In RTL, "left" becomes "right".
-        if (this.horizontalAlign === 'right') {
-          return 'left';
-        }
-        if (this.horizontalAlign === 'left') {
-          return 'right';
-        }
-      }
-      return this.horizontalAlign;
-    },
-
-    attached: function() {
-      // Memoize this to avoid expensive calculations & relayouts.
-      this._isRTL = window.getComputedStyle(this).direction == 'rtl';
-      this.positionTarget = this.positionTarget || this._defaultPositionTarget;
-      if (this.autoFitOnAttach) {
-        if (window.getComputedStyle(this).display === 'none') {
-          setTimeout(function() {
-            this.fit();
-          }.bind(this));
-        } else {
-          this.fit();
-        }
-      }
-    },
-
-    /**
-     * Positions and fits the element into the `fitInto` element.
-     */
-    fit: function() {
-      this.position();
-      this.constrain();
-      this.center();
-    },
-
-    /**
-     * Memoize information needed to position and size the target element.
-     * @suppress {deprecated}
-     */
-    _discoverInfo: function() {
-      if (this._fitInfo) {
-        return;
-      }
-      var target = window.getComputedStyle(this);
-      var sizer = window.getComputedStyle(this.sizingTarget);
-
-      this._fitInfo = {
-        inlineStyle: {
-          top: this.style.top || '',
-          left: this.style.left || '',
-          position: this.style.position || ''
-        },
-        sizerInlineStyle: {
-          maxWidth: this.sizingTarget.style.maxWidth || '',
-          maxHeight: this.sizingTarget.style.maxHeight || '',
-          boxSizing: this.sizingTarget.style.boxSizing || ''
-        },
-        positionedBy: {
-          vertically: target.top !== 'auto' ? 'top' : (target.bottom !== 'auto' ?
-            'bottom' : null),
-          horizontally: target.left !== 'auto' ? 'left' : (target.right !== 'auto' ?
-            'right' : null)
-        },
-        sizedBy: {
-          height: sizer.maxHeight !== 'none',
-          width: sizer.maxWidth !== 'none',
-          minWidth: parseInt(sizer.minWidth, 10) || 0,
-          minHeight: parseInt(sizer.minHeight, 10) || 0
-        },
-        margin: {
-          top: parseInt(target.marginTop, 10) || 0,
-          right: parseInt(target.marginRight, 10) || 0,
-          bottom: parseInt(target.marginBottom, 10) || 0,
-          left: parseInt(target.marginLeft, 10) || 0
-        }
-      };
-
-      // Support these properties until they are removed.
-      if (this.verticalOffset) {
-        this._fitInfo.margin.top = this._fitInfo.margin.bottom = this.verticalOffset;
-        this._fitInfo.inlineStyle.marginTop = this.style.marginTop || '';
-        this._fitInfo.inlineStyle.marginBottom = this.style.marginBottom || '';
-        this.style.marginTop = this.style.marginBottom = this.verticalOffset + 'px';
-      }
-      if (this.horizontalOffset) {
-        this._fitInfo.margin.left = this._fitInfo.margin.right = this.horizontalOffset;
-        this._fitInfo.inlineStyle.marginLeft = this.style.marginLeft || '';
-        this._fitInfo.inlineStyle.marginRight = this.style.marginRight || '';
-        this.style.marginLeft = this.style.marginRight = this.horizontalOffset + 'px';
-      }
-    },
-
-    /**
-     * Resets the target element's position and size constraints, and clear
-     * the memoized data.
-     */
-    resetFit: function() {
-      var info = this._fitInfo || {};
-      for (var property in info.sizerInlineStyle) {
-        this.sizingTarget.style[property] = info.sizerInlineStyle[property];
-      }
-      for (var property in info.inlineStyle) {
-        this.style[property] = info.inlineStyle[property];
-      }
-
-      this._fitInfo = null;
-    },
-
-    /**
-     * Equivalent to calling `resetFit()` and `fit()`. Useful to call this after
-     * the element or the `fitInto` element has been resized, or if any of the
-     * positioning properties (e.g. `horizontalAlign, verticalAlign`) is updated.
-     * It preserves the scroll position of the sizingTarget.
-     */
-    refit: function() {
-      var scrollLeft = this.sizingTarget.scrollLeft;
-      var scrollTop = this.sizingTarget.scrollTop;
-      this.resetFit();
-      this.fit();
-      this.sizingTarget.scrollLeft = scrollLeft;
-      this.sizingTarget.scrollTop = scrollTop;
-    },
-
-    /**
-     * Positions the element according to `horizontalAlign, verticalAlign`.
-     */
-    position: function() {
-      if (!this.horizontalAlign && !this.verticalAlign) {
-        // needs to be centered, and it is done after constrain.
-        return;
-      }
-      this._discoverInfo();
-
-      this.style.position = 'fixed';
-      // Need border-box for margin/padding.
-      this.sizingTarget.style.boxSizing = 'border-box';
-      // Set to 0, 0 in order to discover any offset caused by parent stacking contexts.
-      this.style.left = '0px';
-      this.style.top = '0px';
-
-      var rect = this.getBoundingClientRect();
-      var positionRect = this.__getNormalizedRect(this.positionTarget);
-      var fitRect = this.__getNormalizedRect(this.fitInto);
-
-      var margin = this._fitInfo.margin;
-
-      // Consider the margin as part of the size for position calculations.
-      var size = {
-        width: rect.width + margin.left + margin.right,
-        height: rect.height + margin.top + margin.bottom
-      };
-
-      var position = this.__getPosition(this._localeHorizontalAlign, this.verticalAlign, size, positionRect, fitRect);
-
-      var left = position.left + margin.left;
-      var top = position.top + margin.top;
-
-      // Use original size (without margin).
-      var right = Math.min(fitRect.right - margin.right, left + rect.width);
-      var bottom = Math.min(fitRect.bottom - margin.bottom, top + rect.height);
-
-      var minWidth = this._fitInfo.sizedBy.minWidth;
-      var minHeight = this._fitInfo.sizedBy.minHeight;
-      if (left < margin.left) {
-        left = margin.left;
-        if (right - left < minWidth) {
-          left = right - minWidth;
-        }
-      }
-      if (top < margin.top) {
-        top = margin.top;
-        if (bottom - top < minHeight) {
-          top = bottom - minHeight;
-        }
-      }
-
-      this.sizingTarget.style.maxWidth = (right - left) + 'px';
-      this.sizingTarget.style.maxHeight = (bottom - top) + 'px';
-
-      // Remove the offset caused by any stacking context.
-      this.style.left = (left - rect.left) + 'px';
-      this.style.top = (top - rect.top) + 'px';
-    },
-
-    /**
-     * Constrains the size of the element to `fitInto` by setting `max-height`
-     * and/or `max-width`.
-     */
-    constrain: function() {
-      if (this.horizontalAlign || this.verticalAlign) {
-        return;
-      }
-      this._discoverInfo();
-
-      var info = this._fitInfo;
-      // position at (0px, 0px) if not already positioned, so we can measure the natural size.
-      if (!info.positionedBy.vertically) {
-        this.style.position = 'fixed';
-        this.style.top = '0px';
-      }
-      if (!info.positionedBy.horizontally) {
-        this.style.position = 'fixed';
-        this.style.left = '0px';
-      }
-
-      // need border-box for margin/padding
-      this.sizingTarget.style.boxSizing = 'border-box';
-      // constrain the width and height if not already set
-      var rect = this.getBoundingClientRect();
-      if (!info.sizedBy.height) {
-        this.__sizeDimension(rect, info.positionedBy.vertically, 'top', 'bottom', 'Height');
-      }
-      if (!info.sizedBy.width) {
-        this.__sizeDimension(rect, info.positionedBy.horizontally, 'left', 'right', 'Width');
-      }
-    },
-
-    /**
-     * @protected
-     * @deprecated
-     */
-    _sizeDimension: function(rect, positionedBy, start, end, extent) {
-      this.__sizeDimension(rect, positionedBy, start, end, extent);
-    },
-
-    /**
-     * @private
-     */
-    __sizeDimension: function(rect, positionedBy, start, end, extent) {
-      var info = this._fitInfo;
-      var fitRect = this.__getNormalizedRect(this.fitInto);
-      var max = extent === 'Width' ? fitRect.width : fitRect.height;
-      var flip = (positionedBy === end);
-      var offset = flip ? max - rect[end] : rect[start];
-      var margin = info.margin[flip ? start : end];
-      var offsetExtent = 'offset' + extent;
-      var sizingOffset = this[offsetExtent] - this.sizingTarget[offsetExtent];
-      this.sizingTarget.style['max' + extent] = (max - margin - offset - sizingOffset) + 'px';
-    },
-
-    /**
-     * Centers horizontally and vertically if not already positioned. This also sets
-     * `position:fixed`.
-     */
-    center: function() {
-      if (this.horizontalAlign || this.verticalAlign) {
-        return;
-      }
-      this._discoverInfo();
-
-      var positionedBy = this._fitInfo.positionedBy;
-      if (positionedBy.vertically && positionedBy.horizontally) {
-        // Already positioned.
-        return;
-      }
-      // Need position:fixed to center
-      this.style.position = 'fixed';
-      // Take into account the offset caused by parents that create stacking
-      // contexts (e.g. with transform: translate3d). Translate to 0,0 and
-      // measure the bounding rect.
-      if (!positionedBy.vertically) {
-        this.style.top = '0px';
-      }
-      if (!positionedBy.horizontally) {
-        this.style.left = '0px';
-      }
-      // It will take in consideration margins and transforms
-      var rect = this.getBoundingClientRect();
-      var fitRect = this.__getNormalizedRect(this.fitInto);
-      if (!positionedBy.vertically) {
-        var top = fitRect.top - rect.top + (fitRect.height - rect.height) / 2;
-        this.style.top = top + 'px';
-      }
-      if (!positionedBy.horizontally) {
-        var left = fitRect.left - rect.left + (fitRect.width - rect.width) / 2;
-        this.style.left = left + 'px';
-      }
-    },
-
-    __getNormalizedRect: function(target) {
-      if (target === document.documentElement || target === window) {
-        return {
-          top: 0,
-          left: 0,
-          width: window.innerWidth,
-          height: window.innerHeight,
-          right: window.innerWidth,
-          bottom: window.innerHeight
-        };
-      }
-      return target.getBoundingClientRect();
-    },
-
-    __getCroppedArea: function(position, size, fitRect) {
-      var verticalCrop = Math.min(0, position.top) + Math.min(0, fitRect.bottom - (position.top + size.height));
-      var horizontalCrop = Math.min(0, position.left) + Math.min(0, fitRect.right - (position.left + size.width));
-      return Math.abs(verticalCrop) * size.width + Math.abs(horizontalCrop) * size.height;
-    },
-
-
-    __getPosition: function(hAlign, vAlign, size, positionRect, fitRect) {
-      // All the possible configurations.
-      // Ordered as top-left, top-right, bottom-left, bottom-right.
-      var positions = [{
-        verticalAlign: 'top',
-        horizontalAlign: 'left',
-        top: positionRect.top,
-        left: positionRect.left
-      }, {
-        verticalAlign: 'top',
-        horizontalAlign: 'right',
-        top: positionRect.top,
-        left: positionRect.right - size.width
-      }, {
-        verticalAlign: 'bottom',
-        horizontalAlign: 'left',
-        top: positionRect.bottom - size.height,
-        left: positionRect.left
-      }, {
-        verticalAlign: 'bottom',
-        horizontalAlign: 'right',
-        top: positionRect.bottom - size.height,
-        left: positionRect.right - size.width
-      }];
-
-      if (this.noOverlap) {
-        // Duplicate.
-        for (var i = 0, l = positions.length; i < l; i++) {
-          var copy = {};
-          for (var key in positions[i]) {
-            copy[key] = positions[i][key];
-          }
-          positions.push(copy);
-        }
-        // Horizontal overlap only.
-        positions[0].top = positions[1].top += positionRect.height;
-        positions[2].top = positions[3].top -= positionRect.height;
-        // Vertical overlap only.
-        positions[4].left = positions[6].left += positionRect.width;
-        positions[5].left = positions[7].left -= positionRect.width;
-      }
-
-      // Consider auto as null for coding convenience.
-      vAlign = vAlign === 'auto' ? null : vAlign;
-      hAlign = hAlign === 'auto' ? null : hAlign;
-
-      var position;
-      for (var i = 0; i < positions.length; i++) {
-        var pos = positions[i];
-
-        // If both vAlign and hAlign are defined, return exact match.
-        // For dynamicAlign and noOverlap we'll have more than one candidate, so
-        // we'll have to check the croppedArea to make the best choice.
-        if (!this.dynamicAlign && !this.noOverlap &&
-            pos.verticalAlign === vAlign && pos.horizontalAlign === hAlign) {
-          position = pos;
-          break;
-        }
-
-        // Align is ok if alignment preferences are respected. If no preferences,
-        // it is considered ok.
-        var alignOk = (!vAlign || pos.verticalAlign === vAlign) &&
-                      (!hAlign || pos.horizontalAlign === hAlign);
-
-        // Filter out elements that don't match the alignment (if defined).
-        // With dynamicAlign, we need to consider all the positions to find the
-        // one that minimizes the cropped area.
-        if (!this.dynamicAlign && !alignOk) {
-          continue;
-        }
-
-        position = position || pos;
-        pos.croppedArea = this.__getCroppedArea(pos, size, fitRect);
-        var diff = pos.croppedArea - position.croppedArea;
-        // Check which crops less. If it crops equally, check if align is ok.
-        if (diff < 0 || (diff === 0 && alignOk)) {
-          position = pos;
-        }
-        // If not cropped and respects the align requirements, keep it.
-        // This allows to prefer positions overlapping horizontally over the
-        // ones overlapping vertically.
-        if (position.croppedArea === 0 && alignOk) {
-          break;
-        }
-      }
-
-      return position;
-    }
-
-  };
-(function() {
-'use strict';
-
-  Polymer({
-
-    is: 'iron-overlay-backdrop',
-
-    properties: {
-
-      /**
-       * Returns true if the backdrop is opened.
-       */
       opened: {
         reflectToAttribute: true,
         type: Boolean,
         value: false,
         observer: '_openedChanged'
       }
-
-    },
-
+    },
     listeners: {
-      'transitionend': '_onTransitionend'
-    },
-
+      transitionend: '_onTransitionend'
+    },
     created: function() {
-      // Used to cancel previous requestAnimationFrame calls when opened changes.
       this.__openedRaf = null;
     },
-
     attached: function() {
       this.opened && this._openedChanged(this.opened);
     },
-
-    /**
-     * Appends the backdrop to document body if needed.
-     */
     prepare: function() {
       if (this.opened && !this.parentNode) {
         Polymer.dom(document.body).appendChild(this);
       }
     },
-
-    /**
-     * Shows the backdrop.
-     */
     open: function() {
       this.opened = true;
     },
-
-    /**
-     * Hides the backdrop.
-     */
     close: function() {
       this.opened = false;
     },
-
-    /**
-     * Removes the backdrop from document body if needed.
-     */
     complete: function() {
       if (!this.opened && this.parentNode === document.body) {
         Polymer.dom(this.parentNode).removeChild(this);
       }
     },
-
     _onTransitionend: function(event) {
       if (event && event.target === this) {
         this.complete();
       }
     },
-
-    /**
-     * @param {boolean} opened
-     * @private
-     */
     _openedChanged: function(opened) {
       if (opened) {
-        // Auto-attach.
         this.prepare();
       } else {
-        // Animation might be disabled via the mixin or opacity custom property.
-        // If it is disabled in other ways, it's up to the user to call complete.
         var cs = window.getComputedStyle(this);
         if (cs.transitionDuration === '0s' || cs.opacity == 0) {
           this.complete();
         }
       }
-
       if (!this.isAttached) {
         return;
       }
-
-      // Always cancel previous requestAnimationFrame.
       if (this.__openedRaf) {
         window.cancelAnimationFrame(this.__openedRaf);
         this.__openedRaf = null;
       }
-      // Force relayout to ensure proper transitions.
       this.scrollTop = this.scrollTop;
       this.__openedRaf = window.requestAnimationFrame(function() {
         this.__openedRaf = null;
         this.toggleClass('opened', this.opened);
       }.bind(this));
     }
   });
-
 })();
-/**
-   * @struct
-   * @constructor
-   * @private
-   */
-  Polymer.IronOverlayManagerClass = function() {
-    /**
-     * Used to keep track of the opened overlays.
-     * @private {Array<Element>}
-     */
-    this._overlays = [];
-
-    /**
-     * iframes have a default z-index of 100,
-     * so this default should be at least that.
-     * @private {number}
-     */
-    this._minimumZ = 101;
-
-    /**
-     * Memoized backdrop element.
-     * @private {Element|null}
-     */
-    this._backdropElement = null;
-
-    // Enable document-wide tap recognizer.
-    Polymer.Gestures.add(document, 'tap', this._onCaptureClick.bind(this));
-
-    document.addEventListener('focus', this._onCaptureFocus.bind(this), true);
-    document.addEventListener('keydown', this._onCaptureKeyDown.bind(this), true);
-  };
-
-  Polymer.IronOverlayManagerClass.prototype = {
-
-    constructor: Polymer.IronOverlayManagerClass,
-
-    /**
-     * The shared backdrop element.
-     * @type {!Element} backdropElement
-     */
-    get backdropElement() {
-      if (!this._backdropElement) {
-        this._backdropElement = document.createElement('iron-overlay-backdrop');
-      }
-      return this._backdropElement;
-    },
-
-    /**
-     * The deepest active element.
-     * @type {!Element} activeElement the active element
-     */
-    get deepActiveElement() {
-      // document.activeElement can be null
-      // https://developer.mozilla.org/en-US/docs/Web/API/Document/activeElement
-      // In case of null, default it to document.body.
-      var active = document.activeElement || document.body;
-      while (active.root && Polymer.dom(active.root).activeElement) {
-        active = Polymer.dom(active.root).activeElement;
-      }
-      return active;
-    },
-
-    /**
-     * Brings the overlay at the specified index to the front.
-     * @param {number} i
-     * @private
-     */
-    _bringOverlayAtIndexToFront: function(i) {
-      var overlay = this._overlays[i];
-      if (!overlay) {
-        return;
-      }
-      var lastI = this._overlays.length - 1;
-      var currentOverlay = this._overlays[lastI];
-      // Ensure always-on-top overlay stays on top.
-      if (currentOverlay && this._shouldBeBehindOverlay(overlay, currentOverlay)) {
-        lastI--;
-      }
-      // If already the top element, return.
-      if (i >= lastI) {
-        return;
-      }
-      // Update z-index to be on top.
-      var minimumZ = Math.max(this.currentOverlayZ(), this._minimumZ);
-      if (this._getZ(overlay) <= minimumZ) {
-        this._applyOverlayZ(overlay, minimumZ);
-      }
-
-      // Shift other overlays behind the new on top.
-      while (i < lastI) {
-        this._overlays[i] = this._overlays[i + 1];
-        i++;
-      }
-      this._overlays[lastI] = overlay;
-    },
-
-    /**
-     * Adds the overlay and updates its z-index if it's opened, or removes it if it's closed.
-     * Also updates the backdrop z-index.
-     * @param {!Element} overlay
-     */
-    addOrRemoveOverlay: function(overlay) {
-      if (overlay.opened) {
-        this.addOverlay(overlay);
-      } else {
-        this.removeOverlay(overlay);
-      }
-    },
-
-    /**
-     * Tracks overlays for z-index and focus management.
-     * Ensures the last added overlay with always-on-top remains on top.
-     * @param {!Element} overlay
-     */
-    addOverlay: function(overlay) {
-      var i = this._overlays.indexOf(overlay);
-      if (i >= 0) {
-        this._bringOverlayAtIndexToFront(i);
-        this.trackBackdrop();
-        return;
-      }
-      var insertionIndex = this._overlays.length;
-      var currentOverlay = this._overlays[insertionIndex - 1];
-      var minimumZ = Math.max(this._getZ(currentOverlay), this._minimumZ);
-      var newZ = this._getZ(overlay);
-
-      // Ensure always-on-top overlay stays on top.
-      if (currentOverlay && this._shouldBeBehindOverlay(overlay, currentOverlay)) {
-        // This bumps the z-index of +2.
-        this._applyOverlayZ(currentOverlay, minimumZ);
-        insertionIndex--;
-        // Update minimumZ to match previous overlay's z-index.
-        var previousOverlay = this._overlays[insertionIndex - 1];
-        minimumZ = Math.max(this._getZ(previousOverlay), this._minimumZ);
-      }
-
-      // Update z-index and insert overlay.
-      if (newZ <= minimumZ) {
-        this._applyOverlayZ(overlay, minimumZ);
-      }
-      this._overlays.splice(insertionIndex, 0, overlay);
-
+
+Polymer.IronOverlayManagerClass = function() {
+  this._overlays = [];
+  this._minimumZ = 101;
+  this._backdropElement = null;
+  Polymer.Gestures.add(document, 'tap', this._onCaptureClick.bind(this));
+  document.addEventListener('focus', this._onCaptureFocus.bind(this), true);
+  document.addEventListener('keydown', this._onCaptureKeyDown.bind(this), true);
+};
+
+Polymer.IronOverlayManagerClass.prototype = {
+  constructor: Polymer.IronOverlayManagerClass,
+  get backdropElement() {
+    if (!this._backdropElement) {
+      this._backdropElement = document.createElement('iron-overlay-backdrop');
+    }
+    return this._backdropElement;
+  },
+  get deepActiveElement() {
+    var active = document.activeElement || document.body;
+    while (active.root && Polymer.dom(active.root).activeElement) {
+      active = Polymer.dom(active.root).activeElement;
+    }
+    return active;
+  },
+  _bringOverlayAtIndexToFront: function(i) {
+    var overlay = this._overlays[i];
+    if (!overlay) {
+      return;
+    }
+    var lastI = this._overlays.length - 1;
+    var currentOverlay = this._overlays[lastI];
+    if (currentOverlay && this._shouldBeBehindOverlay(overlay, currentOverlay)) {
+      lastI--;
+    }
+    if (i >= lastI) {
+      return;
+    }
+    var minimumZ = Math.max(this.currentOverlayZ(), this._minimumZ);
+    if (this._getZ(overlay) <= minimumZ) {
+      this._applyOverlayZ(overlay, minimumZ);
+    }
+    while (i < lastI) {
+      this._overlays[i] = this._overlays[i + 1];
+      i++;
+    }
+    this._overlays[lastI] = overlay;
+  },
+  addOrRemoveOverlay: function(overlay) {
+    if (overlay.opened) {
+      this.addOverlay(overlay);
+    } else {
+      this.removeOverlay(overlay);
+    }
+  },
+  addOverlay: function(overlay) {
+    var i = this._overlays.indexOf(overlay);
+    if (i >= 0) {
+      this._bringOverlayAtIndexToFront(i);
       this.trackBackdrop();
-    },
-
-    /**
-     * @param {!Element} overlay
-     */
-    removeOverlay: function(overlay) {
-      var i = this._overlays.indexOf(overlay);
-      if (i === -1) {
-        return;
-      }
-      this._overlays.splice(i, 1);
-
-      this.trackBackdrop();
-    },
-
-    /**
-     * Returns the current overlay.
-     * @return {Element|undefined}
-     */
-    currentOverlay: function() {
-      var i = this._overlays.length - 1;
-      return this._overlays[i];
-    },
-
-    /**
-     * Returns the current overlay z-index.
-     * @return {number}
-     */
-    currentOverlayZ: function() {
-      return this._getZ(this.currentOverlay());
-    },
-
-    /**
-     * Ensures that the minimum z-index of new overlays is at least `minimumZ`.
-     * This does not effect the z-index of any existing overlays.
-     * @param {number} minimumZ
-     */
-    ensureMinimumZ: function(minimumZ) {
-      this._minimumZ = Math.max(this._minimumZ, minimumZ);
-    },
-
-    focusOverlay: function() {
-      var current = /** @type {?} */ (this.currentOverlay());
-      if (current) {
-        current._applyFocus();
-      }
-    },
-
-    /**
-     * Updates the backdrop z-index.
-     */
-    trackBackdrop: function() {
-      var overlay = this._overlayWithBackdrop();
-      // Avoid creating the backdrop if there is no overlay with backdrop.
-      if (!overlay && !this._backdropElement) {
-        return;
-      }
-      this.backdropElement.style.zIndex = this._getZ(overlay) - 1;
-      this.backdropElement.opened = !!overlay;
-    },
-
-    /**
-     * @return {Array<Element>}
-     */
-    getBackdrops: function() {
-      var backdrops = [];
-      for (var i = 0; i < this._overlays.length; i++) {
-        if (this._overlays[i].withBackdrop) {
-          backdrops.push(this._overlays[i]);
-        }
-      }
-      return backdrops;
-    },
-
-    /**
-     * Returns the z-index for the backdrop.
-     * @return {number}
-     */
-    backdropZ: function() {
-      return this._getZ(this._overlayWithBackdrop()) - 1;
-    },
-
-    /**
-     * Returns the first opened overlay that has a backdrop.
-     * @return {Element|undefined}
-     * @private
-     */
-    _overlayWithBackdrop: function() {
-      for (var i = 0; i < this._overlays.length; i++) {
-        if (this._overlays[i].withBackdrop) {
-          return this._overlays[i];
-        }
-      }
-    },
-
-    /**
-     * Calculates the minimum z-index for the overlay.
-     * @param {Element=} overlay
-     * @private
-     */
-    _getZ: function(overlay) {
-      var z = this._minimumZ;
-      if (overlay) {
-        var z1 = Number(overlay.style.zIndex || window.getComputedStyle(overlay).zIndex);
-        // Check if is a number
-        // Number.isNaN not supported in IE 10+
-        if (z1 === z1) {
-          z = z1;
-        }
-      }
-      return z;
-    },
-
-    /**
-     * @param {!Element} element
-     * @param {number|string} z
-     * @private
-     */
-    _setZ: function(element, z) {
-      element.style.zIndex = z;
-    },
-
-    /**
-     * @param {!Element} overlay
-     * @param {number} aboveZ
-     * @private
-     */
-    _applyOverlayZ: function(overlay, aboveZ) {
-      this._setZ(overlay, aboveZ + 2);
-    },
-
-    /**
-     * Returns the deepest overlay in the path.
-     * @param {Array<Element>=} path
-     * @return {Element|undefined}
-     * @suppress {missingProperties}
-     * @private
-     */
-    _overlayInPath: function(path) {
-      path = path || [];
-      for (var i = 0; i < path.length; i++) {
-        if (path[i]._manager === this) {
-          return path[i];
-        }
-      }
-    },
-
-    /**
-     * Ensures the click event is delegated to the right overlay.
-     * @param {!Event} event
-     * @private
-     */
-    _onCaptureClick: function(event) {
-      var overlay = /** @type {?} */ (this.currentOverlay());
-      // Check if clicked outside of top overlay.
-      if (overlay && this._overlayInPath(Polymer.dom(event).path) !== overlay) {
-        overlay._onCaptureClick(event);
-      }
-    },
-
-    /**
-     * Ensures the focus event is delegated to the right overlay.
-     * @param {!Event} event
-     * @private
-     */
-    _onCaptureFocus: function(event) {
-      var overlay = /** @type {?} */ (this.currentOverlay());
-      if (overlay) {
-        overlay._onCaptureFocus(event);
-      }
-    },
-
-    /**
-     * Ensures TAB and ESC keyboard events are delegated to the right overlay.
-     * @param {!Event} event
-     * @private
-     */
-    _onCaptureKeyDown: function(event) {
-      var overlay = /** @type {?} */ (this.currentOverlay());
-      if (overlay) {
-        if (Polymer.IronA11yKeysBehavior.keyboardEventMatchesKeys(event, 'esc')) {
-          overlay._onCaptureEsc(event);
-        } else if (Polymer.IronA11yKeysBehavior.keyboardEventMatchesKeys(event, 'tab')) {
-          overlay._onCaptureTab(event);
-        }
-      }
-    },
-
-    /**
-     * Returns if the overlay1 should be behind overlay2.
-     * @param {!Element} overlay1
-     * @param {!Element} overlay2
-     * @return {boolean}
-     * @suppress {missingProperties}
-     * @private
-     */
-    _shouldBeBehindOverlay: function(overlay1, overlay2) {
-      return !overlay1.alwaysOnTop && overlay2.alwaysOnTop;
-    }
-  };
-
-  Polymer.IronOverlayManager = new Polymer.IronOverlayManagerClass();
+      return;
+    }
+    var insertionIndex = this._overlays.length;
+    var currentOverlay = this._overlays[insertionIndex - 1];
+    var minimumZ = Math.max(this._getZ(currentOverlay), this._minimumZ);
+    var newZ = this._getZ(overlay);
+    if (currentOverlay && this._shouldBeBehindOverlay(overlay, currentOverlay)) {
+      this._applyOverlayZ(currentOverlay, minimumZ);
+      insertionIndex--;
+      var previousOverlay = this._overlays[insertionIndex - 1];
+      minimumZ = Math.max(this._getZ(previousOverlay), this._minimumZ);
+    }
+    if (newZ <= minimumZ) {
+      this._applyOverlayZ(overlay, minimumZ);
+    }
+    this._overlays.splice(insertionIndex, 0, overlay);
+    this.trackBackdrop();
+  },
+  removeOverlay: function(overlay) {
+    var i = this._overlays.indexOf(overlay);
+    if (i === -1) {
+      return;
+    }
+    this._overlays.splice(i, 1);
+    this.trackBackdrop();
+  },
+  currentOverlay: function() {
+    var i = this._overlays.length - 1;
+    return this._overlays[i];
+  },
+  currentOverlayZ: function() {
+    return this._getZ(this.currentOverlay());
+  },
+  ensureMinimumZ: function(minimumZ) {
+    this._minimumZ = Math.max(this._minimumZ, minimumZ);
+  },
+  focusOverlay: function() {
+    var current = this.currentOverlay();
+    if (current) {
+      current._applyFocus();
+    }
+  },
+  trackBackdrop: function() {
+    var overlay = this._overlayWithBackdrop();
+    if (!overlay && !this._backdropElement) {
+      return;
+    }
+    this.backdropElement.style.zIndex = this._getZ(overlay) - 1;
+    this.backdropElement.opened = !!overlay;
+  },
+  getBackdrops: function() {
+    var backdrops = [];
+    for (var i = 0; i < this._overlays.length; i++) {
+      if (this._overlays[i].withBackdrop) {
+        backdrops.push(this._overlays[i]);
+      }
+    }
+    return backdrops;
+  },
+  backdropZ: function() {
+    return this._getZ(this._overlayWithBackdrop()) - 1;
+  },
+  _overlayWithBackdrop: function() {
+    for (var i = 0; i < this._overlays.length; i++) {
+      if (this._overlays[i].withBackdrop) {
+        return this._overlays[i];
+      }
+    }
+  },
+  _getZ: function(overlay) {
+    var z = this._minimumZ;
+    if (overlay) {
+      var z1 = Number(overlay.style.zIndex || window.getComputedStyle(overlay).zIndex);
+      if (z1 === z1) {
+        z = z1;
+      }
+    }
+    return z;
+  },
+  _setZ: function(element, z) {
+    element.style.zIndex = z;
+  },
+  _applyOverlayZ: function(overlay, aboveZ) {
+    this._setZ(overlay, aboveZ + 2);
+  },
+  _overlayInPath: function(path) {
+    path = path || [];
+    for (var i = 0; i < path.length; i++) {
+      if (path[i]._manager === this) {
+        return path[i];
+      }
+    }
+  },
+  _onCaptureClick: function(event) {
+    var overlay = this.currentOverlay();
+    if (overlay && this._overlayInPath(Polymer.dom(event).path) !== overlay) {
+      overlay._onCaptureClick(event);
+    }
+  },
+  _onCaptureFocus: function(event) {
+    var overlay = this.currentOverlay();
+    if (overlay) {
+      overlay._onCaptureFocus(event);
+    }
+  },
+  _onCaptureKeyDown: function(event) {
+    var overlay = this.currentOverlay();
+    if (overlay) {
+      if (Polymer.IronA11yKeysBehavior.keyboardEventMatchesKeys(event, 'esc')) {
+        overlay._onCaptureEsc(event);
+      } else if (Polymer.IronA11yKeysBehavior.keyboardEventMatchesKeys(event, 'tab')) {
+        overlay._onCaptureTab(event);
+      }
+    }
+  },
+  _shouldBeBehindOverlay: function(overlay1, overlay2) {
+    return !overlay1.alwaysOnTop && overlay2.alwaysOnTop;
+  }
+};
+
+Polymer.IronOverlayManager = new Polymer.IronOverlayManagerClass();
+
 (function() {
-'use strict';
-
-/**
-Use `Polymer.IronOverlayBehavior` to implement an element that can be hidden or shown, and displays
-on top of other content. It includes an optional backdrop, and can be used to implement a variety
-of UI controls including dialogs and drop downs. Multiple overlays may be displayed at once.
-
-See the [demo source code](https://github.com/PolymerElements/iron-overlay-behavior/blob/master/demo/simple-overlay.html)
-for an example.
-
-### Closing and canceling
-
-An overlay may be hidden by closing or canceling. The difference between close and cancel is user
-intent. Closing generally implies that the user acknowledged the content on the overlay. By default,
-it will cancel whenever the user taps outside it or presses the escape key. This behavior is
-configurable with the `no-cancel-on-esc-key` and the `no-cancel-on-outside-click` properties.
-`close()` should be called explicitly by the implementer when the user interacts with a control
-in the overlay element. When the dialog is canceled, the overlay fires an 'iron-overlay-canceled'
-event. Call `preventDefault` on this event to prevent the overlay from closing.
-
-### Positioning
-
-By default the element is sized and positioned to fit and centered inside the window. You can
-position and size it manually using CSS. See `Polymer.IronFitBehavior`.
-
-### Backdrop
-
-Set the `with-backdrop` attribute to display a backdrop behind the overlay. The backdrop is
-appended to `<body>` and is of type `<iron-overlay-backdrop>`. See its doc page for styling
-options.
-
-In addition, `with-backdrop` will wrap the focus within the content in the light DOM.
-Override the [`_focusableNodes` getter](#Polymer.IronOverlayBehavior:property-_focusableNodes)
-to achieve a different behavior.
-
-### Limitations
-
-The element is styled to appear on top of other content by setting its `z-index` property. You
-must ensure no element has a stacking context with a higher `z-index` than its parent stacking
-context. You should place this element as a child of `<body>` whenever possible.
-
-@demo demo/index.html
-@polymerBehavior Polymer.IronOverlayBehavior
-*/
-
+  'use strict';
   Polymer.IronOverlayBehaviorImpl = {
-
     properties: {
-
-      /**
-       * True if the overlay is currently displayed.
-       */
       opened: {
         observer: '_openedChanged',
         type: Boolean,
         value: false,
         notify: true
       },
-
-      /**
-       * True if the overlay was canceled when it was last closed.
-       */
       canceled: {
         observer: '_canceledChanged',
         readOnly: true,
         type: Boolean,
         value: false
       },
-
-      /**
-       * Set to true to display a backdrop behind the overlay. It traps the focus
-       * within the light DOM of the overlay.
-       */
       withBackdrop: {
         observer: '_withBackdropChanged',
         type: Boolean
       },
-
-      /**
-       * Set to true to disable auto-focusing the overlay or child nodes with
-       * the `autofocus` attribute` when the overlay is opened.
-       */
       noAutoFocus: {
         type: Boolean,
         value: false
       },
-
-      /**
-       * Set to true to disable canceling the overlay with the ESC key.
-       */
       noCancelOnEscKey: {
         type: Boolean,
         value: false
       },
-
-      /**
-       * Set to true to disable canceling the overlay by clicking outside it.
-       */
       noCancelOnOutsideClick: {
         type: Boolean,
         value: false
       },
-
-      /**
-       * Contains the reason(s) this overlay was last closed (see `iron-overlay-closed`).
-       * `IronOverlayBehavior` provides the `canceled` reason; implementers of the
-       * behavior can provide other reasons in addition to `canceled`.
-       */
       closingReason: {
-        // was a getter before, but needs to be a property so other
-        // behaviors can override this.
         type: Object
       },
-
-      /**
-       * Set to true to enable restoring of focus when overlay is closed.
-       */
       restoreFocusOnClose: {
         type: Boolean,
         value: false
       },
-
-      /**
-       * Set to true to keep overlay always on top.
-       */
       alwaysOnTop: {
         type: Boolean
       },
-
-      /**
-       * Shortcut to access to the overlay manager.
-       * @private
-       * @type {Polymer.IronOverlayManagerClass}
-       */
       _manager: {
         type: Object,
         value: Polymer.IronOverlayManager
       },
-
-      /**
-       * The node being focused.
-       * @type {?Node}
-       */
       _focusedChild: {
         type: Object
       }
-
-    },
-
+    },
     listeners: {
       'iron-resize': '_onIronResize'
     },
-
-    /**
-     * The backdrop element.
-     * @type {Element}
-     */
     get backdropElement() {
       return this._manager.backdropElement;
     },
-
-    /**
-     * Returns the node to give focus to.
-     * @type {Node}
-     */
     get _focusNode() {
       return this._focusedChild || Polymer.dom(this).querySelector('[autofocus]') || this;
     },
-
-    /**
-     * Array of nodes that can receive focus (overlay included), ordered by `tabindex`.
-     * This is used to retrieve which is the first and last focusable nodes in order
-     * to wrap the focus for overlays `with-backdrop`.
-     *
-     * If you know what is your content (specifically the first and last focusable children),
-     * you can override this method to return only `[firstFocusable, lastFocusable];`
-     * @type {Array<Node>}
-     * @protected
-     */
     get _focusableNodes() {
-      // Elements that can be focused even if they have [disabled] attribute.
-      var FOCUSABLE_WITH_DISABLED = [
-        'a[href]',
-        'area[href]',
-        'iframe',
-        '[tabindex]',
-        '[contentEditable=true]'
-      ];
-
-      // Elements that cannot be focused if they have [disabled] attribute.
-      var FOCUSABLE_WITHOUT_DISABLED = [
-        'input',
-        'select',
-        'textarea',
-        'button'
-      ];
-
-      // Discard elements with tabindex=-1 (makes them not focusable).
-      var selector = FOCUSABLE_WITH_DISABLED.join(':not([tabindex="-1"]),') +
-        ':not([tabindex="-1"]),' +
-        FOCUSABLE_WITHOUT_DISABLED.join(':not([disabled]):not([tabindex="-1"]),') +
-        ':not([disabled]):not([tabindex="-1"])';
-
+      var FOCUSABLE_WITH_DISABLED = [ 'a[href]', 'area[href]', 'iframe', '[tabindex]', '[contentEditable=true]' ];
+      var FOCUSABLE_WITHOUT_DISABLED = [ 'input', 'select', 'textarea', 'button' ];
+      var selector = FOCUSABLE_WITH_DISABLED.join(':not([tabindex="-1"]),') + ':not([tabindex="-1"]),' + FOCUSABLE_WITHOUT_DISABLED.join(':not([disabled]):not([tabindex="-1"]),') + ':not([disabled]):not([tabindex="-1"])';
       var focusables = Polymer.dom(this).querySelectorAll(selector);
       if (this.tabIndex >= 0) {
-        // Insert at the beginning because we might have all elements with tabIndex = 0,
-        // and the overlay should be the first of the list.
         focusables.splice(0, 0, this);
       }
-      // Sort by tabindex.
-      return focusables.sort(function (a, b) {
+      return focusables.sort(function(a, b) {
         if (a.tabIndex === b.tabIndex) {
           return 0;
         }
         if (a.tabIndex === 0 || a.tabIndex > b.tabIndex) {
           return 1;
         }
         return -1;
       });
     },
-
     ready: function() {
-      // Used to skip calls to notifyResize and refit while the overlay is animating.
       this.__isAnimating = false;
-      // with-backdrop needs tabindex to be set in order to trap the focus.
-      // If it is not set, IronOverlayBehavior will set it, and remove it if with-backdrop = false.
       this.__shouldRemoveTabIndex = false;
-      // Used for wrapping the focus on TAB / Shift+TAB.
       this.__firstFocusableNode = this.__lastFocusableNode = null;
-      // Used by __onNextAnimationFrame to cancel any previous callback.
       this.__raf = null;
-      // Focused node before overlay gets opened. Can be restored on close.
       this.__restoreFocusNode = null;
       this._ensureSetup();
     },
-
     attached: function() {
-      // Call _openedChanged here so that position can be computed correctly.
       if (this.opened) {
         this._openedChanged(this.opened);
       }
       this._observer = Polymer.dom(this).observeNodes(this._onNodesChange);
     },
-
     detached: function() {
       Polymer.dom(this).unobserveNodes(this._observer);
       this._observer = null;
       if (this.__raf) {
         window.cancelAnimationFrame(this.__raf);
         this.__raf = null;
       }
       this._manager.removeOverlay(this);
     },
-
-    /**
-     * Toggle the opened state of the overlay.
-     */
     toggle: function() {
       this._setCanceled(false);
       this.opened = !this.opened;
     },
-
-    /**
-     * Open the overlay.
-     */
     open: function() {
       this._setCanceled(false);
       this.opened = true;
     },
-
-    /**
-     * Close the overlay.
-     */
     close: function() {
       this._setCanceled(false);
       this.opened = false;
     },
-
-    /**
-     * Cancels the overlay.
-     * @param {Event=} event The original event
-     */
     cancel: function(event) {
-      var cancelEvent = this.fire('iron-overlay-canceled', event, {cancelable: true});
+      var cancelEvent = this.fire('iron-overlay-canceled', event, {
+        cancelable: true
+      });
       if (cancelEvent.defaultPrevented) {
         return;
       }
-
       this._setCanceled(true);
       this.opened = false;
     },
-
     _ensureSetup: function() {
       if (this._overlaySetup) {
         return;
       }
       this._overlaySetup = true;
       this.style.outline = 'none';
       this.style.display = 'none';
     },
-
-    /**
-     * Called when `opened` changes.
-     * @param {boolean=} opened
-     * @protected
-     */
     _openedChanged: function(opened) {
       if (opened) {
         this.removeAttribute('aria-hidden');
       } else {
         this.setAttribute('aria-hidden', 'true');
       }
-
-      // Defer any animation-related code on attached
-      // (_openedChanged gets called again on attached).
       if (!this.isAttached) {
         return;
       }
-
       this.__isAnimating = true;
-
-      // Use requestAnimationFrame for non-blocking rendering.
       this.__onNextAnimationFrame(this.__openedChanged);
     },
-
     _canceledChanged: function() {
       this.closingReason = this.closingReason || {};
       this.closingReason.canceled = this.canceled;
     },
-
     _withBackdropChanged: function() {
-      // If tabindex is already set, no need to override it.
       if (this.withBackdrop && !this.hasAttribute('tabindex')) {
         this.setAttribute('tabindex', '-1');
         this.__shouldRemoveTabIndex = true;
       } else if (this.__shouldRemoveTabIndex) {
         this.removeAttribute('tabindex');
         this.__shouldRemoveTabIndex = false;
       }
       if (this.opened && this.isAttached) {
         this._manager.trackBackdrop();
       }
     },
-
-    /**
-     * tasks which must occur before opening; e.g. making the element visible.
-     * @protected
-     */
     _prepareRenderOpened: function() {
-      // Store focused node.
       this.__restoreFocusNode = this._manager.deepActiveElement;
-
-      // Needed to calculate the size of the overlay so that transitions on its size
-      // will have the correct starting points.
       this._preparePositioning();
       this.refit();
       this._finishPositioning();
-
-      // Safari will apply the focus to the autofocus element when displayed
-      // for the first time, so we make sure to return the focus where it was.
       if (this.noAutoFocus && document.activeElement === this._focusNode) {
         this._focusNode.blur();
         this.__restoreFocusNode.focus();
       }
     },
-
-    /**
-     * Tasks which cause the overlay to actually open; typically play an animation.
-     * @protected
-     */
     _renderOpened: function() {
       this._finishRenderOpened();
     },
-
-    /**
-     * Tasks which cause the overlay to actually close; typically play an animation.
-     * @protected
-     */
     _renderClosed: function() {
       this._finishRenderClosed();
     },
-
-    /**
-     * Tasks to be performed at the end of open action. Will fire `iron-overlay-opened`.
-     * @protected
-     */
     _finishRenderOpened: function() {
       this.notifyResize();
       this.__isAnimating = false;
-
-      // Store it so we don't query too much.
       var focusableNodes = this._focusableNodes;
       this.__firstFocusableNode = focusableNodes[0];
       this.__lastFocusableNode = focusableNodes[focusableNodes.length - 1];
-
       this.fire('iron-overlay-opened');
     },
-
-    /**
-     * Tasks to be performed at the end of close action. Will fire `iron-overlay-closed`.
-     * @protected
-     */
     _finishRenderClosed: function() {
-      // Hide the overlay.
       this.style.display = 'none';
-      // Reset z-index only at the end of the animation.
       this.style.zIndex = '';
       this.notifyResize();
       this.__isAnimating = false;
       this.fire('iron-overlay-closed', this.closingReason);
     },
-
     _preparePositioning: function() {
       this.style.transition = this.style.webkitTransition = 'none';
       this.style.transform = this.style.webkitTransform = 'none';
       this.style.display = '';
     },
-
     _finishPositioning: function() {
-      // First, make it invisible & reactivate animations.
       this.style.display = 'none';
-      // Force reflow before re-enabling animations so that they don't start.
-      // Set scrollTop to itself so that Closure Compiler doesn't remove this.
       this.scrollTop = this.scrollTop;
       this.style.transition = this.style.webkitTransition = '';
       this.style.transform = this.style.webkitTransform = '';
-      // Now that animations are enabled, make it visible again
       this.style.display = '';
-      // Force reflow, so that following animations are properly started.
-      // Set scrollTop to itself so that Closure Compiler doesn't remove this.
       this.scrollTop = this.scrollTop;
     },
-
-    /**
-     * Applies focus according to the opened state.
-     * @protected
-     */
     _applyFocus: function() {
       if (this.opened) {
         if (!this.noAutoFocus) {
           this._focusNode.focus();
         }
-      }
-      else {
+      } else {
         this._focusNode.blur();
         this._focusedChild = null;
-        // Restore focus.
         if (this.restoreFocusOnClose && this.__restoreFocusNode) {
           this.__restoreFocusNode.focus();
         }
         this.__restoreFocusNode = null;
-        // If many overlays get closed at the same time, one of them would still
-        // be the currentOverlay even if already closed, and would call _applyFocus
-        // infinitely, so we check for this not to be the current overlay.
         var currentOverlay = this._manager.currentOverlay();
         if (currentOverlay && this !== currentOverlay) {
           currentOverlay._applyFocus();
         }
       }
     },
-
-    /**
-     * Cancels (closes) the overlay. Call when click happens outside the overlay.
-     * @param {!Event} event
-     * @protected
-     */
     _onCaptureClick: function(event) {
       if (!this.noCancelOnOutsideClick) {
         this.cancel(event);
       }
     },
-
-    /**
-     * Keeps track of the focused child. If withBackdrop, traps focus within overlay.
-     * @param {!Event} event
-     * @protected
-     */
-    _onCaptureFocus: function (event) {
+    _onCaptureFocus: function(event) {
       if (!this.withBackdrop) {
         return;
       }
       var path = Polymer.dom(event).path;
       if (path.indexOf(this) === -1) {
         event.stopPropagation();
         this._applyFocus();
       } else {
         this._focusedChild = path[0];
       }
     },
-
-    /**
-     * Handles the ESC key event and cancels (closes) the overlay.
-     * @param {!Event} event
-     * @protected
-     */
     _onCaptureEsc: function(event) {
       if (!this.noCancelOnEscKey) {
         this.cancel(event);
       }
     },
-
-    /**
-     * Handles TAB key events to track focus changes.
-     * Will wrap focus for overlays withBackdrop.
-     * @param {!Event} event
-     * @protected
-     */
     _onCaptureTab: function(event) {
       if (!this.withBackdrop) {
         return;
       }
-      // TAB wraps from last to first focusable.
-      // Shift + TAB wraps from first to last focusable.
       var shift = event.shiftKey;
       var nodeToCheck = shift ? this.__firstFocusableNode : this.__lastFocusableNode;
       var nodeToSet = shift ? this.__lastFocusableNode : this.__firstFocusableNode;
       var shouldWrap = false;
       if (nodeToCheck === nodeToSet) {
-        // If nodeToCheck is the same as nodeToSet, it means we have an overlay
-        // with 0 or 1 focusables; in either case we still need to trap the
-        // focus within the overlay.
         shouldWrap = true;
       } else {
-        // In dom=shadow, the manager will receive focus changes on the main
-        // root but not the ones within other shadow roots, so we can't rely on
-        // _focusedChild, but we should check the deepest active element.
         var focusedNode = this._manager.deepActiveElement;
-        // If the active element is not the nodeToCheck but the overlay itself,
-        // it means the focus is about to go outside the overlay, hence we
-        // should prevent that (e.g. user opens the overlay and hit Shift+TAB).
-        shouldWrap = (focusedNode === nodeToCheck || focusedNode === this);
-      }
-
+        shouldWrap = focusedNode === nodeToCheck || focusedNode === this;
+      }
       if (shouldWrap) {
-        // When the overlay contains the last focusable element of the document
-        // and it's already focused, pressing TAB would move the focus outside
-        // the document (e.g. to the browser search bar). Similarly, when the
-        // overlay contains the first focusable element of the document and it's
-        // already focused, pressing Shift+TAB would move the focus outside the
-        // document (e.g. to the browser search bar).
-        // In both cases, we would not receive a focus event, but only a blur.
-        // In order to achieve focus wrapping, we prevent this TAB event and
-        // force the focus. This will also prevent the focus to temporarily move
-        // outside the overlay, which might cause scrolling.
         event.preventDefault();
         this._focusedChild = nodeToSet;
         this._applyFocus();
       }
     },
-
-    /**
-     * Refits if the overlay is opened and not animating.
-     * @protected
-     */
     _onIronResize: function() {
       if (this.opened && !this.__isAnimating) {
         this.__onNextAnimationFrame(this.refit);
       }
     },
-
-    /**
-     * Will call notifyResize if overlay is opened.
-     * Can be overridden in order to avoid multiple observers on the same node.
-     * @protected
-     */
     _onNodesChange: function() {
       if (this.opened && !this.__isAnimating) {
         this.notifyResize();
       }
     },
-
-    /**
-     * Tasks executed when opened changes: prepare for the opening, move the
-     * focus, update the manager, render opened/closed.
-     * @private
-     */
     __openedChanged: function() {
       if (this.opened) {
-        // Make overlay visible, then add it to the manager.
         this._prepareRenderOpened();
         this._manager.addOverlay(this);
-        // Move the focus to the child node with [autofocus].
         this._applyFocus();
-
         this._renderOpened();
       } else {
-        // Remove overlay, then restore the focus before actually closing.
         this._manager.removeOverlay(this);
         this._applyFocus();
-
         this._renderClosed();
       }
     },
-
-    /**
-     * Executes a callback on the next animation frame, overriding any previous
-     * callback awaiting for the next animation frame. e.g.
-     * `__onNextAnimationFrame(callback1) && __onNextAnimationFrame(callback2)`;
-     * `callback1` will never be invoked.
-     * @param {!Function} callback Its `this` parameter is the overlay itself.
-     * @private
-     */
     __onNextAnimationFrame: function(callback) {
       if (this.__raf) {
         window.cancelAnimationFrame(this.__raf);
       }
       var self = this;
       this.__raf = window.requestAnimationFrame(function nextAnimationFrame() {
         self.__raf = null;
         callback.call(self);
       });
     }
-
   };
-
-  /** @polymerBehavior */
-  Polymer.IronOverlayBehavior = [Polymer.IronFitBehavior, Polymer.IronResizableBehavior, Polymer.IronOverlayBehaviorImpl];
-
-  /**
-   * Fired after the overlay opens.
-   * @event iron-overlay-opened
-   */
-
-  /**
-   * Fired when the overlay is canceled, but before it is closed.
-   * @event iron-overlay-canceled
-   * @param {Event} event The closing of the overlay can be prevented
-   * by calling `event.preventDefault()`. The `event.detail` is the original event that
-   * originated the canceling (e.g. ESC keyboard event or click event outside the overlay).
-   */
-
-  /**
-   * Fired after the overlay closes.
-   * @event iron-overlay-closed
-   * @param {Event} event The `event.detail` is the `closingReason` property
-   * (contains `canceled`, whether the overlay was canceled).
-   */
-
+  Polymer.IronOverlayBehavior = [ Polymer.IronFitBehavior, Polymer.IronResizableBehavior, Polymer.IronOverlayBehaviorImpl ];
 })();
-/**
-   * `Polymer.NeonAnimatableBehavior` is implemented by elements containing animations for use with
-   * elements implementing `Polymer.NeonAnimationRunnerBehavior`.
-   * @polymerBehavior
-   */
-  Polymer.NeonAnimatableBehavior = {
-
+
+Polymer.NeonAnimatableBehavior = {
+  properties: {
+    animationConfig: {
+      type: Object
+    },
+    entryAnimation: {
+      observer: '_entryAnimationChanged',
+      type: String
+    },
+    exitAnimation: {
+      observer: '_exitAnimationChanged',
+      type: String
+    }
+  },
+  _entryAnimationChanged: function() {
+    this.animationConfig = this.animationConfig || {};
+    this.animationConfig['entry'] = [ {
+      name: this.entryAnimation,
+      node: this
+    } ];
+  },
+  _exitAnimationChanged: function() {
+    this.animationConfig = this.animationConfig || {};
+    this.animationConfig['exit'] = [ {
+      name: this.exitAnimation,
+      node: this
+    } ];
+  },
+  _copyProperties: function(config1, config2) {
+    for (var property in config2) {
+      config1[property] = config2[property];
+    }
+  },
+  _cloneConfig: function(config) {
+    var clone = {
+      isClone: true
+    };
+    this._copyProperties(clone, config);
+    return clone;
+  },
+  _getAnimationConfigRecursive: function(type, map, allConfigs) {
+    if (!this.animationConfig) {
+      return;
+    }
+    if (this.animationConfig.value && typeof this.animationConfig.value === 'function') {
+      this._warn(this._logf('playAnimation', "Please put 'animationConfig' inside of your components 'properties' object instead of outside of it."));
+      return;
+    }
+    var thisConfig;
+    if (type) {
+      thisConfig = this.animationConfig[type];
+    } else {
+      thisConfig = this.animationConfig;
+    }
+    if (!Array.isArray(thisConfig)) {
+      thisConfig = [ thisConfig ];
+    }
+    if (thisConfig) {
+      for (var config, index = 0; config = thisConfig[index]; index++) {
+        if (config.animatable) {
+          config.animatable._getAnimationConfigRecursive(config.type || type, map, allConfigs);
+        } else {
+          if (config.id) {
+            var cachedConfig = map[config.id];
+            if (cachedConfig) {
+              if (!cachedConfig.isClone) {
+                map[config.id] = this._cloneConfig(cachedConfig);
+                cachedConfig = map[config.id];
+              }
+              this._copyProperties(cachedConfig, config);
+            } else {
+              map[config.id] = config;
+            }
+          } else {
+            allConfigs.push(config);
+          }
+        }
+      }
+    }
+  },
+  getAnimationConfig: function(type) {
+    var map = {};
+    var allConfigs = [];
+    this._getAnimationConfigRecursive(type, map, allConfigs);
+    for (var key in map) {
+      allConfigs.push(map[key]);
+    }
+    return allConfigs;
+  }
+};
+
+Polymer.NeonAnimationRunnerBehaviorImpl = {
+  _configureAnimations: function(configs) {
+    var results = [];
+    if (configs.length > 0) {
+      for (var config, index = 0; config = configs[index]; index++) {
+        var neonAnimation = document.createElement(config.name);
+        if (neonAnimation.isNeonAnimation) {
+          var result = null;
+          try {
+            result = neonAnimation.configure(config);
+            if (typeof result.cancel != 'function') {
+              result = document.timeline.play(result);
+            }
+          } catch (e) {
+            result = null;
+            console.warn('Couldnt play', '(', config.name, ').', e);
+          }
+          if (result) {
+            results.push({
+              neonAnimation: neonAnimation,
+              config: config,
+              animation: result
+            });
+          }
+        } else {
+          console.warn(this.is + ':', config.name, 'not found!');
+        }
+      }
+    }
+    return results;
+  },
+  _shouldComplete: function(activeEntries) {
+    var finished = true;
+    for (var i = 0; i < activeEntries.length; i++) {
+      if (activeEntries[i].animation.playState != 'finished') {
+        finished = false;
+        break;
+      }
+    }
+    return finished;
+  },
+  _complete: function(activeEntries) {
+    for (var i = 0; i < activeEntries.length; i++) {
+      activeEntries[i].neonAnimation.complete(activeEntries[i].config);
+    }
+    for (var i = 0; i < activeEntries.length; i++) {
+      activeEntries[i].animation.cancel();
+    }
+  },
+  playAnimation: function(type, cookie) {
+    var configs = this.getAnimationConfig(type);
+    if (!configs) {
+      return;
+    }
+    this._active = this._active || {};
+    if (this._active[type]) {
+      this._complete(this._active[type]);
+      delete this._active[type];
+    }
+    var activeEntries = this._configureAnimations(configs);
+    if (activeEntries.length == 0) {
+      this.fire('neon-animation-finish', cookie, {
+        bubbles: false
+      });
+      return;
+    }
+    this._active[type] = activeEntries;
+    for (var i = 0; i < activeEntries.length; i++) {
+      activeEntries[i].animation.onfinish = function() {
+        if (this._shouldComplete(activeEntries)) {
+          this._complete(activeEntries);
+          delete this._active[type];
+          this.fire('neon-animation-finish', cookie, {
+            bubbles: false
+          });
+        }
+      }.bind(this);
+    }
+  },
+  cancelAnimation: function() {
+    for (var k in this._animations) {
+      this._animations[k].cancel();
+    }
+    this._animations = {};
+  }
+};
+
+Polymer.NeonAnimationRunnerBehavior = [ Polymer.NeonAnimatableBehavior, Polymer.NeonAnimationRunnerBehaviorImpl ];
+
+Polymer.NeonAnimationBehavior = {
+  properties: {
+    animationTiming: {
+      type: Object,
+      value: function() {
+        return {
+          duration: 500,
+          easing: 'cubic-bezier(0.4, 0, 0.2, 1)',
+          fill: 'both'
+        };
+      }
+    }
+  },
+  isNeonAnimation: true,
+  timingFromConfig: function(config) {
+    if (config.timing) {
+      for (var property in config.timing) {
+        this.animationTiming[property] = config.timing[property];
+      }
+    }
+    return this.animationTiming;
+  },
+  setPrefixedProperty: function(node, property, value) {
+    var map = {
+      transform: [ 'webkitTransform' ],
+      transformOrigin: [ 'mozTransformOrigin', 'webkitTransformOrigin' ]
+    };
+    var prefixes = map[property];
+    for (var prefix, index = 0; prefix = prefixes[index]; index++) {
+      node.style[prefix] = value;
+    }
+    node.style[property] = value;
+  },
+  complete: function() {}
+};
+
+Polymer({
+  is: 'opaque-animation',
+  behaviors: [ Polymer.NeonAnimationBehavior ],
+  configure: function(config) {
+    var node = config.node;
+    this._effect = new KeyframeEffect(node, [ {
+      opacity: '1'
+    }, {
+      opacity: '1'
+    } ], this.timingFromConfig(config));
+    node.style.opacity = '0';
+    return this._effect;
+  },
+  complete: function(config) {
+    config.node.style.opacity = '';
+  }
+});
+
+(function() {
+  'use strict';
+  var LAST_TOUCH_POSITION = {
+    pageX: 0,
+    pageY: 0
+  };
+  var ROOT_TARGET = null;
+  var SCROLLABLE_NODES = [];
+  Polymer.IronDropdownScrollManager = {
+    get currentLockingElement() {
+      return this._lockingElements[this._lockingElements.length - 1];
+    },
+    elementIsScrollLocked: function(element) {
+      var currentLockingElement = this.currentLockingElement;
+      if (currentLockingElement === undefined) return false;
+      var scrollLocked;
+      if (this._hasCachedLockedElement(element)) {
+        return true;
+      }
+      if (this._hasCachedUnlockedElement(element)) {
+        return false;
+      }
+      scrollLocked = !!currentLockingElement && currentLockingElement !== element && !this._composedTreeContains(currentLockingElement, element);
+      if (scrollLocked) {
+        this._lockedElementCache.push(element);
+      } else {
+        this._unlockedElementCache.push(element);
+      }
+      return scrollLocked;
+    },
+    pushScrollLock: function(element) {
+      if (this._lockingElements.indexOf(element) >= 0) {
+        return;
+      }
+      if (this._lockingElements.length === 0) {
+        this._lockScrollInteractions();
+      }
+      this._lockingElements.push(element);
+      this._lockedElementCache = [];
+      this._unlockedElementCache = [];
+    },
+    removeScrollLock: function(element) {
+      var index = this._lockingElements.indexOf(element);
+      if (index === -1) {
+        return;
+      }
+      this._lockingElements.splice(index, 1);
+      this._lockedElementCache = [];
+      this._unlockedElementCache = [];
+      if (this._lockingElements.length === 0) {
+        this._unlockScrollInteractions();
+      }
+    },
+    _lockingElements: [],
+    _lockedElementCache: null,
+    _unlockedElementCache: null,
+    _hasCachedLockedElement: function(element) {
+      return this._lockedElementCache.indexOf(element) > -1;
+    },
+    _hasCachedUnlockedElement: function(element) {
+      return this._unlockedElementCache.indexOf(element) > -1;
+    },
+    _composedTreeContains: function(element, child) {
+      var contentElements;
+      var distributedNodes;
+      var contentIndex;
+      var nodeIndex;
+      if (element.contains(child)) {
+        return true;
+      }
+      contentElements = Polymer.dom(element).querySelectorAll('content');
+      for (contentIndex = 0; contentIndex < contentElements.length; ++contentIndex) {
+        distributedNodes = Polymer.dom(contentElements[contentIndex]).getDistributedNodes();
+        for (nodeIndex = 0; nodeIndex < distributedNodes.length; ++nodeIndex) {
+          if (this._composedTreeContains(distributedNodes[nodeIndex], child)) {
+            return true;
+          }
+        }
+      }
+      return false;
+    },
+    _scrollInteractionHandler: function(event) {
+      if (event.cancelable && this._shouldPreventScrolling(event)) {
+        event.preventDefault();
+      }
+      if (event.targetTouches) {
+        var touch = event.targetTouches[0];
+        LAST_TOUCH_POSITION.pageX = touch.pageX;
+        LAST_TOUCH_POSITION.pageY = touch.pageY;
+      }
+    },
+    _lockScrollInteractions: function() {
+      this._boundScrollHandler = this._boundScrollHandler || this._scrollInteractionHandler.bind(this);
+      document.addEventListener('wheel', this._boundScrollHandler, true);
+      document.addEventListener('mousewheel', this._boundScrollHandler, true);
+      document.addEventListener('DOMMouseScroll', this._boundScrollHandler, true);
+      document.addEventListener('touchstart', this._boundScrollHandler, true);
+      document.addEventListener('touchmove', this._boundScrollHandler, true);
+    },
+    _unlockScrollInteractions: function() {
+      document.removeEventListener('wheel', this._boundScrollHandler, true);
+      document.removeEventListener('mousewheel', this._boundScrollHandler, true);
+      document.removeEventListener('DOMMouseScroll', this._boundScrollHandler, true);
+      document.removeEventListener('touchstart', this._boundScrollHandler, true);
+      document.removeEventListener('touchmove', this._boundScrollHandler, true);
+    },
+    _shouldPreventScrolling: function(event) {
+      var target = Polymer.dom(event).rootTarget;
+      if (event.type !== 'touchmove' && ROOT_TARGET !== target) {
+        ROOT_TARGET = target;
+        SCROLLABLE_NODES = this._getScrollableNodes(Polymer.dom(event).path);
+      }
+      if (!SCROLLABLE_NODES.length) {
+        return true;
+      }
+      if (event.type === 'touchstart') {
+        return false;
+      }
+      var info = this._getScrollInfo(event);
+      return !this._getScrollingNode(SCROLLABLE_NODES, info.deltaX, info.deltaY);
+    },
+    _getScrollableNodes: function(nodes) {
+      var scrollables = [];
+      var lockingIndex = nodes.indexOf(this.currentLockingElement);
+      for (var i = 0; i <= lockingIndex; i++) {
+        var node = nodes[i];
+        if (node.nodeType === 11) {
+          continue;
+        }
+        var style = node.style;
+        if (style.overflow !== 'scroll' && style.overflow !== 'auto') {
+          style = window.getComputedStyle(node);
+        }
+        if (style.overflow === 'scroll' || style.overflow === 'auto') {
+          scrollables.push(node);
+        }
+      }
+      return scrollables;
+    },
+    _getScrollingNode: function(nodes, deltaX, deltaY) {
+      if (!deltaX && !deltaY) {
+        return;
+      }
+      var verticalScroll = Math.abs(deltaY) >= Math.abs(deltaX);
+      for (var i = 0; i < nodes.length; i++) {
+        var node = nodes[i];
+        var canScroll = false;
+        if (verticalScroll) {
+          canScroll = deltaY < 0 ? node.scrollTop > 0 : node.scrollTop < node.scrollHeight - node.clientHeight;
+        } else {
+          canScroll = deltaX < 0 ? node.scrollLeft > 0 : node.scrollLeft < node.scrollWidth - node.clientWidth;
+        }
+        if (canScroll) {
+          return node;
+        }
+      }
+    },
+    _getScrollInfo: function(event) {
+      var info = {
+        deltaX: event.deltaX,
+        deltaY: event.deltaY
+      };
+      if ('deltaX' in event) {} else if ('wheelDeltaX' in event) {
+        info.deltaX = -event.wheelDeltaX;
+        info.deltaY = -event.wheelDeltaY;
+      } else if ('axis' in event) {
+        info.deltaX = event.axis === 1 ? event.detail : 0;
+        info.deltaY = event.axis === 2 ? event.detail : 0;
+      } else if (event.targetTouches) {
+        var touch = event.targetTouches[0];
+        info.deltaX = LAST_TOUCH_POSITION.pageX - touch.pageX;
+        info.deltaY = LAST_TOUCH_POSITION.pageY - touch.pageY;
+      }
+      return info;
+    }
+  };
+})();
+
+(function() {
+  'use strict';
+  Polymer({
+    is: 'iron-dropdown',
+    behaviors: [ Polymer.IronControlState, Polymer.IronA11yKeysBehavior, Polymer.IronOverlayBehavior, Polymer.NeonAnimationRunnerBehavior ],
     properties: {
-
-      /**
-       * Animation configuration. See README for more info.
-       */
-      animationConfig: {
+      horizontalAlign: {
+        type: String,
+        value: 'left',
+        reflectToAttribute: true
+      },
+      verticalAlign: {
+        type: String,
+        value: 'top',
+        reflectToAttribute: true
+      },
+      openAnimationConfig: {
         type: Object
       },
-
-      /**
-       * Convenience property for setting an 'entry' animation. Do not set `animationConfig.entry`
-       * manually if using this. The animated node is set to `this` if using this property.
-       */
-      entryAnimation: {
-        observer: '_entryAnimationChanged',
-        type: String
+      closeAnimationConfig: {
+        type: Object
       },
-
-      /**
-       * Convenience property for setting an 'exit' animation. Do not set `animationConfig.exit`
-       * manually if using this. The animated node is set to `this` if using this property.
-       */
-      exitAnimation: {
-        observer: '_exitAnimationChanged',
-        type: String
-      }
-
-    },
-
-    _entryAnimationChanged: function() {
-      this.animationConfig = this.animationConfig || {};
-      this.animationConfig['entry'] = [{
-        name: this.entryAnimation,
-        node: this
-      }];
-    },
-
-    _exitAnimationChanged: function() {
-      this.animationConfig = this.animationConfig || {};
-      this.animationConfig['exit'] = [{
-        name: this.exitAnimation,
-        node: this
-      }];
-    },
-
-    _copyProperties: function(config1, config2) {
-      // shallowly copy properties from config2 to config1
-      for (var property in config2) {
-        config1[property] = config2[property];
-      }
-    },
-
-    _cloneConfig: function(config) {
-      var clone = {
-        isClone: true
+      focusTarget: {
+        type: Object
+      },
+      noAnimations: {
+        type: Boolean,
+        value: false
+      },
+      allowOutsideScroll: {
+        type: Boolean,
+        value: false
+      },
+      _boundOnCaptureScroll: {
+        type: Function,
+        value: function() {
+          return this._onCaptureScroll.bind(this);
+        }
+      }
+    },
+    listeners: {
+      'neon-animation-finish': '_onNeonAnimationFinish'
+    },
+    observers: [ '_updateOverlayPosition(positionTarget, verticalAlign, horizontalAlign, verticalOffset, horizontalOffset)' ],
+    get containedElement() {
+      return Polymer.dom(this.$.content).getDistributedNodes()[0];
+    },
+    get _focusTarget() {
+      return this.focusTarget || this.containedElement;
+    },
+    ready: function() {
+      this._scrollTop = 0;
+      this._scrollLeft = 0;
+      this._refitOnScrollRAF = null;
+    },
+    detached: function() {
+      this.cancelAnimation();
+      Polymer.IronDropdownScrollManager.removeScrollLock(this);
+    },
+    _openedChanged: function() {
+      if (this.opened && this.disabled) {
+        this.cancel();
+      } else {
+        this.cancelAnimation();
+        this.sizingTarget = this.containedElement || this.sizingTarget;
+        this._updateAnimationConfig();
+        this._saveScrollPosition();
+        if (this.opened) {
+          document.addEventListener('scroll', this._boundOnCaptureScroll);
+          !this.allowOutsideScroll && Polymer.IronDropdownScrollManager.pushScrollLock(this);
+        } else {
+          document.removeEventListener('scroll', this._boundOnCaptureScroll);
+          Polymer.IronDropdownScrollManager.removeScrollLock(this);
+        }
+        Polymer.IronOverlayBehaviorImpl._openedChanged.apply(this, arguments);
+      }
+    },
+    _renderOpened: function() {
+      if (!this.noAnimations && this.animationConfig.open) {
+        this.$.contentWrapper.classList.add('animating');
+        this.playAnimation('open');
+      } else {
+        Polymer.IronOverlayBehaviorImpl._renderOpened.apply(this, arguments);
+      }
+    },
+    _renderClosed: function() {
+      if (!this.noAnimations && this.animationConfig.close) {
+        this.$.contentWrapper.classList.add('animating');
+        this.playAnimation('close');
+      } else {
+        Polymer.IronOverlayBehaviorImpl._renderClosed.apply(this, arguments);
+      }
+    },
+    _onNeonAnimationFinish: function() {
+      this.$.contentWrapper.classList.remove('animating');
+      if (this.opened) {
+        this._finishRenderOpened();
+      } else {
+        this._finishRenderClosed();
+      }
+    },
+    _onCaptureScroll: function() {
+      if (!this.allowOutsideScroll) {
+        this._restoreScrollPosition();
+      } else {
+        this._refitOnScrollRAF && window.cancelAnimationFrame(this._refitOnScrollRAF);
+        this._refitOnScrollRAF = window.requestAnimationFrame(this.refit.bind(this));
+      }
+    },
+    _saveScrollPosition: function() {
+      if (document.scrollingElement) {
+        this._scrollTop = document.scrollingElement.scrollTop;
+        this._scrollLeft = document.scrollingElement.scrollLeft;
+      } else {
+        this._scrollTop = Math.max(document.documentElement.scrollTop, document.body.scrollTop);
+        this._scrollLeft = Math.max(document.documentElement.scrollLeft, document.body.scrollLeft);
+      }
+    },
+    _restoreScrollPosition: function() {
+      if (document.scrollingElement) {
+        document.scrollingElement.scrollTop = this._scrollTop;
+        document.scrollingElement.scrollLeft = this._scrollLeft;
+      } else {
+        document.documentElement.scrollTop = this._scrollTop;
+        document.documentElement.scrollLeft = this._scrollLeft;
+        document.body.scrollTop = this._scrollTop;
+        document.body.scrollLeft = this._scrollLeft;
+      }
+    },
+    _updateAnimationConfig: function() {
+      var animations = (this.openAnimationConfig || []).concat(this.closeAnimationConfig || []);
+      for (var i = 0; i < animations.length; i++) {
+        animations[i].node = this.containedElement;
+      }
+      this.animationConfig = {
+        open: this.openAnimationConfig,
+        close: this.closeAnimationConfig
       };
-      this._copyProperties(clone, config);
-      return clone;
-    },
-
-    _getAnimationConfigRecursive: function(type, map, allConfigs) {
-      if (!this.animationConfig) {
-        return;
-      }
-
-      if(this.animationConfig.value && typeof this.animationConfig.value === 'function') {
-        this._warn(this._logf('playAnimation', "Please put 'animationConfig' inside of your components 'properties' object instead of outside of it."));
-        return;
-      }
-
-      // type is optional
-      var thisConfig;
-      if (type) {
-        thisConfig = this.animationConfig[type];
-      } else {
-        thisConfig = this.animationConfig;
-      }
-
-      if (!Array.isArray(thisConfig)) {
-        thisConfig = [thisConfig];
-      }
-
-      // iterate animations and recurse to process configurations from child nodes
-      if (thisConfig) {
-        for (var config, index = 0; config = thisConfig[index]; index++) {
-          if (config.animatable) {
-            config.animatable._getAnimationConfigRecursive(config.type || type, map, allConfigs);
-          } else {
-            if (config.id) {
-              var cachedConfig = map[config.id];
-              if (cachedConfig) {
-                // merge configurations with the same id, making a clone lazily
-                if (!cachedConfig.isClone) {
-                  map[config.id] = this._cloneConfig(cachedConfig)
-                  cachedConfig = map[config.id];
-                }
-                this._copyProperties(cachedConfig, config);
-              } else {
-                // put any configs with an id into a map
-                map[config.id] = config;
-              }
-            } else {
-              allConfigs.push(config);
-            }
-          }
-        }
-      }
-    },
-
-    /**
-     * An element implementing `Polymer.NeonAnimationRunnerBehavior` calls this method to configure
-     * an animation with an optional type. Elements implementing `Polymer.NeonAnimatableBehavior`
-     * should define the property `animationConfig`, which is either a configuration object
-     * or a map of animation type to array of configuration objects.
-     */
-    getAnimationConfig: function(type) {
-      var map = {};
-      var allConfigs = [];
-      this._getAnimationConfigRecursive(type, map, allConfigs);
-      // append the configurations saved in the map to the array
-      for (var key in map) {
-        allConfigs.push(map[key]);
-      }
-      return allConfigs;
-    }
-
-  };
-/**
-   * `Polymer.NeonAnimationRunnerBehavior` adds a method to run animations.
-   *
-   * @polymerBehavior Polymer.NeonAnimationRunnerBehavior
-   */
-  Polymer.NeonAnimationRunnerBehaviorImpl = {
-
-    _configureAnimations: function(configs) {
-      var results = [];
-      if (configs.length > 0) {
-        for (var config, index = 0; config = configs[index]; index++) {
-          var neonAnimation = document.createElement(config.name);
-          // is this element actually a neon animation?
-          if (neonAnimation.isNeonAnimation) {
-            var result = null;
-            // configuration or play could fail if polyfills aren't loaded
-            try {
-              result = neonAnimation.configure(config);
-              // Check if we have an Effect rather than an Animation
-              if (typeof result.cancel != 'function') { 
-                result = document.timeline.play(result);
-              }
-            } catch (e) {
-              result = null;
-              console.warn('Couldnt play', '(', config.name, ').', e);
-            }
-            if (result) {
-              results.push({
-                neonAnimation: neonAnimation,
-                config: config,
-                animation: result,
-              });
-            }
-          } else {
-            console.warn(this.is + ':', config.name, 'not found!');
-          }
-        }
-      }
-      return results;
-    },
-
-    _shouldComplete: function(activeEntries) {
-      var finished = true;
-      for (var i = 0; i < activeEntries.length; i++) {
-        if (activeEntries[i].animation.playState != 'finished') {
-          finished = false;
-          break;
-        }
-      }
-      return finished;
-    },
-
-    _complete: function(activeEntries) {
-      for (var i = 0; i < activeEntries.length; i++) {
-        activeEntries[i].neonAnimation.complete(activeEntries[i].config);
-      }
-      for (var i = 0; i < activeEntries.length; i++) {
-        activeEntries[i].animation.cancel();
-      }
-    },
-
-    /**
-     * Plays an animation with an optional `type`.
-     * @param {string=} type
-     * @param {!Object=} cookie
-     */
-    playAnimation: function(type, cookie) {
-      var configs = this.getAnimationConfig(type);
-      if (!configs) {
-        return;
-      }
-      this._active = this._active || {};
-      if (this._active[type]) {
-        this._complete(this._active[type]);
-        delete this._active[type];
-      }
-
-      var activeEntries = this._configureAnimations(configs);
-
-      if (activeEntries.length == 0) {
-        this.fire('neon-animation-finish', cookie, {bubbles: false});
-        return;
-      }
-
-      this._active[type] = activeEntries;
-
-      for (var i = 0; i < activeEntries.length; i++) {
-        activeEntries[i].animation.onfinish = function() {
-          if (this._shouldComplete(activeEntries)) {
-            this._complete(activeEntries);
-            delete this._active[type];
-            this.fire('neon-animation-finish', cookie, {bubbles: false});
-          }
-        }.bind(this);
-      }
-    },
-
-    /**
-     * Cancels the currently running animations.
-     */
-    cancelAnimation: function() {
-      for (var k in this._animations) {
-        this._animations[k].cancel();
-      }
-      this._animations = {};
-    }
-  };
-
-  /** @polymerBehavior Polymer.NeonAnimationRunnerBehavior */
-  Polymer.NeonAnimationRunnerBehavior = [
-    Polymer.NeonAnimatableBehavior,
-    Polymer.NeonAnimationRunnerBehaviorImpl
-  ];
-/**
-   * Use `Polymer.NeonAnimationBehavior` to implement an animation.
-   * @polymerBehavior
-   */
-  Polymer.NeonAnimationBehavior = {
-
-    properties: {
-
-      /**
-       * Defines the animation timing.
-       */
-      animationTiming: {
-        type: Object,
-        value: function() {
-          return {
-            duration: 500,
-            easing: 'cubic-bezier(0.4, 0, 0.2, 1)',
-            fill: 'both'
-          }
-        }
-      }
-
-    },
-
-    /**
-     * Can be used to determine that elements implement this behavior.
-     */
-    isNeonAnimation: true,
-
-    /**
-     * Do any animation configuration here.
-     */
-    // configure: function(config) {
-    // },
-
-    /**
-     * Returns the animation timing by mixing in properties from `config` to the defaults defined
-     * by the animation.
-     */
-    timingFromConfig: function(config) {
-      if (config.timing) {
-        for (var property in config.timing) {
-          this.animationTiming[property] = config.timing[property];
-        }
-      }
-      return this.animationTiming;
-    },
-
-    /**
-     * Sets `transform` and `transformOrigin` properties along with the prefixed versions.
-     */
-    setPrefixedProperty: function(node, property, value) {
-      var map = {
-        'transform': ['webkitTransform'],
-        'transformOrigin': ['mozTransformOrigin', 'webkitTransformOrigin']
-      };
-      var prefixes = map[property];
-      for (var prefix, index = 0; prefix = prefixes[index]; index++) {
-        node.style[prefix] = value;
-      }
-      node.style[property] = value;
-    },
-
-    /**
-     * Called when the animation finishes.
-     */
-    complete: function() {}
-
-  };
+    },
+    _updateOverlayPosition: function() {
+      if (this.isAttached) {
+        this.notifyResize();
+      }
+    },
+    _applyFocus: function() {
+      var focusTarget = this.focusTarget || this.containedElement;
+      if (focusTarget && this.opened && !this.noAutoFocus) {
+        focusTarget.focus();
+      } else {
+        Polymer.IronOverlayBehaviorImpl._applyFocus.apply(this, arguments);
+      }
+    }
+  });
+})();
+
 Polymer({
-
-    is: 'opaque-animation',
-
-    behaviors: [
-      Polymer.NeonAnimationBehavior
-    ],
-
-    configure: function(config) {
-      var node = config.node;
-      this._effect = new KeyframeEffect(node, [
-        {'opacity': '1'},
-        {'opacity': '1'}
-      ], this.timingFromConfig(config));
-      node.style.opacity = '0';
-      return this._effect;
-    },
-
-    complete: function(config) {
-      config.node.style.opacity = '';
-    }
-
-  });
-(function() {
-    'use strict';
-    // Used to calculate the scroll direction during touch events.
-    var LAST_TOUCH_POSITION = {
-      pageX: 0,
-      pageY: 0
-    };
-    // Used to avoid computing event.path and filter scrollable nodes (better perf).
-    var ROOT_TARGET = null;
-    var SCROLLABLE_NODES = [];
-
-    /**
-     * The IronDropdownScrollManager is intended to provide a central source
-     * of authority and control over which elements in a document are currently
-     * allowed to scroll.
-     */
-
-    Polymer.IronDropdownScrollManager = {
-
-      /**
-       * The current element that defines the DOM boundaries of the
-       * scroll lock. This is always the most recently locking element.
-       */
-      get currentLockingElement() {
-        return this._lockingElements[this._lockingElements.length - 1];
-      },
-
-      /**
-       * Returns true if the provided element is "scroll locked", which is to
-       * say that it cannot be scrolled via pointer or keyboard interactions.
-       *
-       * @param {HTMLElement} element An HTML element instance which may or may
-       * not be scroll locked.
-       */
-      elementIsScrollLocked: function(element) {
-        var currentLockingElement = this.currentLockingElement;
-
-        if (currentLockingElement === undefined)
-          return false;
-
-        var scrollLocked;
-
-        if (this._hasCachedLockedElement(element)) {
-          return true;
-        }
-
-        if (this._hasCachedUnlockedElement(element)) {
-          return false;
-        }
-
-        scrollLocked = !!currentLockingElement &&
-          currentLockingElement !== element &&
-          !this._composedTreeContains(currentLockingElement, element);
-
-        if (scrollLocked) {
-          this._lockedElementCache.push(element);
-        } else {
-          this._unlockedElementCache.push(element);
-        }
-
-        return scrollLocked;
-      },
-
-      /**
-       * Push an element onto the current scroll lock stack. The most recently
-       * pushed element and its children will be considered scrollable. All
-       * other elements will not be scrollable.
-       *
-       * Scroll locking is implemented as a stack so that cases such as
-       * dropdowns within dropdowns are handled well.
-       *
-       * @param {HTMLElement} element The element that should lock scroll.
-       */
-      pushScrollLock: function(element) {
-        // Prevent pushing the same element twice
-        if (this._lockingElements.indexOf(element) >= 0) {
-          return;
-        }
-
-        if (this._lockingElements.length === 0) {
-          this._lockScrollInteractions();
-        }
-
-        this._lockingElements.push(element);
-
-        this._lockedElementCache = [];
-        this._unlockedElementCache = [];
-      },
-
-      /**
-       * Remove an element from the scroll lock stack. The element being
-       * removed does not need to be the most recently pushed element. However,
-       * the scroll lock constraints only change when the most recently pushed
-       * element is removed.
-       *
-       * @param {HTMLElement} element The element to remove from the scroll
-       * lock stack.
-       */
-      removeScrollLock: function(element) {
-        var index = this._lockingElements.indexOf(element);
-
-        if (index === -1) {
-          return;
-        }
-
-        this._lockingElements.splice(index, 1);
-
-        this._lockedElementCache = [];
-        this._unlockedElementCache = [];
-
-        if (this._lockingElements.length === 0) {
-          this._unlockScrollInteractions();
-        }
-      },
-
-      _lockingElements: [],
-
-      _lockedElementCache: null,
-
-      _unlockedElementCache: null,
-
-      _hasCachedLockedElement: function(element) {
-        return this._lockedElementCache.indexOf(element) > -1;
-      },
-
-      _hasCachedUnlockedElement: function(element) {
-        return this._unlockedElementCache.indexOf(element) > -1;
-      },
-
-      _composedTreeContains: function(element, child) {
-        // NOTE(cdata): This method iterates over content elements and their
-        // corresponding distributed nodes to implement a contains-like method
-        // that pierces through the composed tree of the ShadowDOM. Results of
-        // this operation are cached (elsewhere) on a per-scroll-lock basis, to
-        // guard against potentially expensive lookups happening repeatedly as
-        // a user scrolls / touchmoves.
-        var contentElements;
-        var distributedNodes;
-        var contentIndex;
-        var nodeIndex;
-
-        if (element.contains(child)) {
-          return true;
-        }
-
-        contentElements = Polymer.dom(element).querySelectorAll('content');
-
-        for (contentIndex = 0; contentIndex < contentElements.length; ++contentIndex) {
-
-          distributedNodes = Polymer.dom(contentElements[contentIndex]).getDistributedNodes();
-
-          for (nodeIndex = 0; nodeIndex < distributedNodes.length; ++nodeIndex) {
-
-            if (this._composedTreeContains(distributedNodes[nodeIndex], child)) {
-              return true;
-            }
-          }
-        }
-
-        return false;
-      },
-
-      _scrollInteractionHandler: function(event) {
-        // Avoid canceling an event with cancelable=false, e.g. scrolling is in
-        // progress and cannot be interrupted.
-        if (event.cancelable && this._shouldPreventScrolling(event)) {
-          event.preventDefault();
-        }
-        // If event has targetTouches (touch event), update last touch position.
-        if (event.targetTouches) {
-          var touch = event.targetTouches[0];
-          LAST_TOUCH_POSITION.pageX = touch.pageX;
-          LAST_TOUCH_POSITION.pageY = touch.pageY;
-        }
-      },
-
-      _lockScrollInteractions: function() {
-        this._boundScrollHandler = this._boundScrollHandler ||
-          this._scrollInteractionHandler.bind(this);
-        // Modern `wheel` event for mouse wheel scrolling:
-        document.addEventListener('wheel', this._boundScrollHandler, true);
-        // Older, non-standard `mousewheel` event for some FF:
-        document.addEventListener('mousewheel', this._boundScrollHandler, true);
-        // IE:
-        document.addEventListener('DOMMouseScroll', this._boundScrollHandler, true);
-        // Save the SCROLLABLE_NODES on touchstart, to be used on touchmove.
-        document.addEventListener('touchstart', this._boundScrollHandler, true);
-        // Mobile devices can scroll on touch move:
-        document.addEventListener('touchmove', this._boundScrollHandler, true);
-      },
-
-      _unlockScrollInteractions: function() {
-        document.removeEventListener('wheel', this._boundScrollHandler, true);
-        document.removeEventListener('mousewheel', this._boundScrollHandler, true);
-        document.removeEventListener('DOMMouseScroll', this._boundScrollHandler, true);
-        document.removeEventListener('touchstart', this._boundScrollHandler, true);
-        document.removeEventListener('touchmove', this._boundScrollHandler, true);
-      },
-
-      /**
-       * Returns true if the event causes scroll outside the current locking
-       * element, e.g. pointer/keyboard interactions, or scroll "leaking"
-       * outside the locking element when it is already at its scroll boundaries.
-       * @param {!Event} event
-       * @return {boolean}
-       * @private
-       */
-      _shouldPreventScrolling: function(event) {
-
-        // Update if root target changed. For touch events, ensure we don't
-        // update during touchmove.
-        var target = Polymer.dom(event).rootTarget;
-        if (event.type !== 'touchmove' && ROOT_TARGET !== target) {
-          ROOT_TARGET = target;
-          SCROLLABLE_NODES = this._getScrollableNodes(Polymer.dom(event).path);
-        }
-
-        // Prevent event if no scrollable nodes.
-        if (!SCROLLABLE_NODES.length) {
-          return true;
-        }
-        // Don't prevent touchstart event inside the locking element when it has
-        // scrollable nodes.
-        if (event.type === 'touchstart') {
-          return false;
-        }
-        // Get deltaX/Y.
-        var info = this._getScrollInfo(event);
-        // Prevent if there is no child that can scroll.
-        return !this._getScrollingNode(SCROLLABLE_NODES, info.deltaX, info.deltaY);
-      },
-
-      /**
-       * Returns an array of scrollable nodes up to the current locking element,
-       * which is included too if scrollable.
-       * @param {!Array<Node>} nodes
-       * @return {Array<Node>} scrollables
-       * @private
-       */
-      _getScrollableNodes: function(nodes) {
-        var scrollables = [];
-        var lockingIndex = nodes.indexOf(this.currentLockingElement);
-        // Loop from root target to locking element (included).
-        for (var i = 0; i <= lockingIndex; i++) {
-          var node = nodes[i];
-          // Skip document fragments.
-          if (node.nodeType === 11) {
-            continue;
-          }
-          // Check inline style before checking computed style.
-          var style = node.style;
-          if (style.overflow !== 'scroll' && style.overflow !== 'auto') {
-            style = window.getComputedStyle(node);
-          }
-          if (style.overflow === 'scroll' || style.overflow === 'auto') {
-            scrollables.push(node);
-          }
-        }
-        return scrollables;
-      },
-
-      /**
-       * Returns the node that is scrolling. If there is no scrolling,
-       * returns undefined.
-       * @param {!Array<Node>} nodes
-       * @param {number} deltaX Scroll delta on the x-axis
-       * @param {number} deltaY Scroll delta on the y-axis
-       * @return {Node|undefined}
-       * @private
-       */
-      _getScrollingNode: function(nodes, deltaX, deltaY) {
-        // No scroll.
-        if (!deltaX && !deltaY) {
-          return;
-        }
-        // Check only one axis according to where there is more scroll.
-        // Prefer vertical to horizontal.
-        var verticalScroll = Math.abs(deltaY) >= Math.abs(deltaX);
-        for (var i = 0; i < nodes.length; i++) {
-          var node = nodes[i];
-          var canScroll = false;
-          if (verticalScroll) {
-            // delta < 0 is scroll up, delta > 0 is scroll down.
-            canScroll = deltaY < 0 ? node.scrollTop > 0 :
-              node.scrollTop < node.scrollHeight - node.clientHeight;
-          } else {
-            // delta < 0 is scroll left, delta > 0 is scroll right.
-            canScroll = deltaX < 0 ? node.scrollLeft > 0 :
-              node.scrollLeft < node.scrollWidth - node.clientWidth;
-          }
-          if (canScroll) {
-            return node;
-          }
-        }
-      },
-
-      /**
-       * Returns scroll `deltaX` and `deltaY`.
-       * @param {!Event} event The scroll event
-       * @return {{
-       *  deltaX: number The x-axis scroll delta (positive: scroll right,
-       *                 negative: scroll left, 0: no scroll),
-       *  deltaY: number The y-axis scroll delta (positive: scroll down,
-       *                 negative: scroll up, 0: no scroll)
-       * }} info
-       * @private
-       */
-      _getScrollInfo: function(event) {
-        var info = {
-          deltaX: event.deltaX,
-          deltaY: event.deltaY
-        };
-        // Already available.
-        if ('deltaX' in event) {
-          // do nothing, values are already good.
-        }
-        // Safari has scroll info in `wheelDeltaX/Y`.
-        else if ('wheelDeltaX' in event) {
-          info.deltaX = -event.wheelDeltaX;
-          info.deltaY = -event.wheelDeltaY;
-        }
-        // Firefox has scroll info in `detail` and `axis`.
-        else if ('axis' in event) {
-          info.deltaX = event.axis === 1 ? event.detail : 0;
-          info.deltaY = event.axis === 2 ? event.detail : 0;
-        }
-        // On mobile devices, calculate scroll direction.
-        else if (event.targetTouches) {
-          var touch = event.targetTouches[0];
-          // Touch moves from right to left => scrolling goes right.
-          info.deltaX = LAST_TOUCH_POSITION.pageX - touch.pageX;
-          // Touch moves from down to up => scrolling goes down.
-          info.deltaY = LAST_TOUCH_POSITION.pageY - touch.pageY;
-        }
-        return info;
-      }
-    };
-  })();
-(function() {
-      'use strict';
-
-      Polymer({
-        is: 'iron-dropdown',
-
-        behaviors: [
-          Polymer.IronControlState,
-          Polymer.IronA11yKeysBehavior,
-          Polymer.IronOverlayBehavior,
-          Polymer.NeonAnimationRunnerBehavior
-        ],
-
-        properties: {
-          /**
-           * The orientation against which to align the dropdown content
-           * horizontally relative to the dropdown trigger.
-           * Overridden from `Polymer.IronFitBehavior`.
-           */
-          horizontalAlign: {
-            type: String,
-            value: 'left',
-            reflectToAttribute: true
-          },
-
-          /**
-           * The orientation against which to align the dropdown content
-           * vertically relative to the dropdown trigger.
-           * Overridden from `Polymer.IronFitBehavior`.
-           */
-          verticalAlign: {
-            type: String,
-            value: 'top',
-            reflectToAttribute: true
-          },
-
-          /**
-           * An animation config. If provided, this will be used to animate the
-           * opening of the dropdown.
-           */
-          openAnimationConfig: {
-            type: Object
-          },
-
-          /**
-           * An animation config. If provided, this will be used to animate the
-           * closing of the dropdown.
-           */
-          closeAnimationConfig: {
-            type: Object
-          },
-
-          /**
-           * If provided, this will be the element that will be focused when
-           * the dropdown opens.
-           */
-          focusTarget: {
-            type: Object
-          },
-
-          /**
-           * Set to true to disable animations when opening and closing the
-           * dropdown.
-           */
-          noAnimations: {
-            type: Boolean,
-            value: false
-          },
-
-          /**
-           * By default, the dropdown will constrain scrolling on the page
-           * to itself when opened.
-           * Set to true in order to prevent scroll from being constrained
-           * to the dropdown when it opens.
-           */
-          allowOutsideScroll: {
-            type: Boolean,
-            value: false
-          },
-
-          /**
-           * Callback for scroll events.
-           * @type {Function}
-           * @private
-           */
-          _boundOnCaptureScroll: {
-            type: Function,
-            value: function() {
-              return this._onCaptureScroll.bind(this);
-            }
-          }
-        },
-
-        listeners: {
-          'neon-animation-finish': '_onNeonAnimationFinish'
-        },
-
-        observers: [
-          '_updateOverlayPosition(positionTarget, verticalAlign, horizontalAlign, verticalOffset, horizontalOffset)'
-        ],
-
-        /**
-         * The element that is contained by the dropdown, if any.
-         */
-        get containedElement() {
-          return Polymer.dom(this.$.content).getDistributedNodes()[0];
-        },
-
-        /**
-         * The element that should be focused when the dropdown opens.
-         * @deprecated
-         */
-        get _focusTarget() {
-          return this.focusTarget || this.containedElement;
-        },
-
-        ready: function() {
-          // Memoized scrolling position, used to block scrolling outside.
-          this._scrollTop = 0;
-          this._scrollLeft = 0;
-          // Used to perform a non-blocking refit on scroll.
-          this._refitOnScrollRAF = null;
-        },
-
-        detached: function() {
-          this.cancelAnimation();
-          Polymer.IronDropdownScrollManager.removeScrollLock(this);
-        },
-
-        /**
-         * Called when the value of `opened` changes.
-         * Overridden from `IronOverlayBehavior`
-         */
-        _openedChanged: function() {
-          if (this.opened && this.disabled) {
-            this.cancel();
-          } else {
-            this.cancelAnimation();
-            this.sizingTarget = this.containedElement || this.sizingTarget;
-            this._updateAnimationConfig();
-            this._saveScrollPosition();
-            if (this.opened) {
-              document.addEventListener('scroll', this._boundOnCaptureScroll);
-              !this.allowOutsideScroll && Polymer.IronDropdownScrollManager.pushScrollLock(this);
-            } else {
-              document.removeEventListener('scroll', this._boundOnCaptureScroll);
-              Polymer.IronDropdownScrollManager.removeScrollLock(this);
-            }
-            Polymer.IronOverlayBehaviorImpl._openedChanged.apply(this, arguments);
-          }
-        },
-
-        /**
-         * Overridden from `IronOverlayBehavior`.
-         */
-        _renderOpened: function() {
-          if (!this.noAnimations && this.animationConfig.open) {
-            this.$.contentWrapper.classList.add('animating');
-            this.playAnimation('open');
-          } else {
-            Polymer.IronOverlayBehaviorImpl._renderOpened.apply(this, arguments);
-          }
-        },
-
-        /**
-         * Overridden from `IronOverlayBehavior`.
-         */
-        _renderClosed: function() {
-
-          if (!this.noAnimations && this.animationConfig.close) {
-            this.$.contentWrapper.classList.add('animating');
-            this.playAnimation('close');
-          } else {
-            Polymer.IronOverlayBehaviorImpl._renderClosed.apply(this, arguments);
-          }
-        },
-
-        /**
-         * Called when animation finishes on the dropdown (when opening or
-         * closing). Responsible for "completing" the process of opening or
-         * closing the dropdown by positioning it or setting its display to
-         * none.
-         */
-        _onNeonAnimationFinish: function() {
-          this.$.contentWrapper.classList.remove('animating');
-          if (this.opened) {
-            this._finishRenderOpened();
-          } else {
-            this._finishRenderClosed();
-          }
-        },
-
-        _onCaptureScroll: function() {
-          if (!this.allowOutsideScroll) {
-            this._restoreScrollPosition();
-          } else {
-            this._refitOnScrollRAF && window.cancelAnimationFrame(this._refitOnScrollRAF);
-            this._refitOnScrollRAF = window.requestAnimationFrame(this.refit.bind(this));
-          }
-        },
-
-        /**
-         * Memoizes the scroll position of the outside scrolling element.
-         * @private
-         */
-        _saveScrollPosition: function() {
-          if (document.scrollingElement) {
-            this._scrollTop = document.scrollingElement.scrollTop;
-            this._scrollLeft = document.scrollingElement.scrollLeft;
-          } else {
-            // Since we don't know if is the body or html, get max.
-            this._scrollTop = Math.max(document.documentElement.scrollTop, document.body.scrollTop);
-            this._scrollLeft = Math.max(document.documentElement.scrollLeft, document.body.scrollLeft);
-          }
-        },
-
-        /**
-         * Resets the scroll position of the outside scrolling element.
-         * @private
-         */
-        _restoreScrollPosition: function() {
-          if (document.scrollingElement) {
-            document.scrollingElement.scrollTop = this._scrollTop;
-            document.scrollingElement.scrollLeft = this._scrollLeft;
-          } else {
-            // Since we don't know if is the body or html, set both.
-            document.documentElement.scrollTop = this._scrollTop;
-            document.documentElement.scrollLeft = this._scrollLeft;
-            document.body.scrollTop = this._scrollTop;
-            document.body.scrollLeft = this._scrollLeft;
-          }
-        },
-
-        /**
-         * Constructs the final animation config from different properties used
-         * to configure specific parts of the opening and closing animations.
-         */
-        _updateAnimationConfig: function() {
-          var animations = (this.openAnimationConfig || []).concat(this.closeAnimationConfig || []);
-          for (var i = 0; i < animations.length; i++) {
-            animations[i].node = this.containedElement;
-          }
-          this.animationConfig = {
-            open: this.openAnimationConfig,
-            close: this.closeAnimationConfig
-          };
-        },
-
-        /**
-         * Updates the overlay position based on configured horizontal
-         * and vertical alignment.
-         */
-        _updateOverlayPosition: function() {
-          if (this.isAttached) {
-            // This triggers iron-resize, and iron-overlay-behavior will call refit if needed.
-            this.notifyResize();
-          }
-        },
-
-        /**
-         * Apply focus to focusTarget or containedElement
-         */
-        _applyFocus: function () {
-          var focusTarget = this.focusTarget || this.containedElement;
-          if (focusTarget && this.opened && !this.noAutoFocus) {
-            focusTarget.focus();
-          } else {
-            Polymer.IronOverlayBehaviorImpl._applyFocus.apply(this, arguments);
-          }
-        }
-      });
-    })();
+  is: 'fade-in-animation',
+  behaviors: [ Polymer.NeonAnimationBehavior ],
+  configure: function(config) {
+    var node = config.node;
+    this._effect = new KeyframeEffect(node, [ {
+      opacity: '0'
+    }, {
+      opacity: '1'
+    } ], this.timingFromConfig(config));
+    return this._effect;
+  }
+});
+
 Polymer({
-
-    is: 'fade-in-animation',
-
-    behaviors: [
-      Polymer.NeonAnimationBehavior
-    ],
-
-    configure: function(config) {
-      var node = config.node;
-      this._effect = new KeyframeEffect(node, [
-        {'opacity': '0'},
-        {'opacity': '1'}
-      ], this.timingFromConfig(config));
-      return this._effect;
-    }
-
-  });
+  is: 'fade-out-animation',
+  behaviors: [ Polymer.NeonAnimationBehavior ],
+  configure: function(config) {
+    var node = config.node;
+    this._effect = new KeyframeEffect(node, [ {
+      opacity: '1'
+    }, {
+      opacity: '0'
+    } ], this.timingFromConfig(config));
+    return this._effect;
+  }
+});
+
 Polymer({
-
-    is: 'fade-out-animation',
-
-    behaviors: [
-      Polymer.NeonAnimationBehavior
-    ],
-
-    configure: function(config) {
-      var node = config.node;
-      this._effect = new KeyframeEffect(node, [
-        {'opacity': '1'},
-        {'opacity': '0'}
-      ], this.timingFromConfig(config));
-      return this._effect;
-    }
-
-  });
+  is: 'paper-menu-grow-height-animation',
+  behaviors: [ Polymer.NeonAnimationBehavior ],
+  configure: function(config) {
+    var node = config.node;
+    var rect = node.getBoundingClientRect();
+    var height = rect.height;
+    this._effect = new KeyframeEffect(node, [ {
+      height: height / 2 + 'px'
+    }, {
+      height: height + 'px'
+    } ], this.timingFromConfig(config));
+    return this._effect;
+  }
+});
+
 Polymer({
-    is: 'paper-menu-grow-height-animation',
-
-    behaviors: [
-      Polymer.NeonAnimationBehavior
-    ],
-
-    configure: function(config) {
-      var node = config.node;
-      var rect = node.getBoundingClientRect();
-      var height = rect.height;
-
-      this._effect = new KeyframeEffect(node, [{
-        height: (height / 2) + 'px'
-      }, {
-        height: height + 'px'
-      }], this.timingFromConfig(config));
-
-      return this._effect;
-    }
-  });
-
-  Polymer({
-    is: 'paper-menu-grow-width-animation',
-
-    behaviors: [
-      Polymer.NeonAnimationBehavior
-    ],
-
-    configure: function(config) {
-      var node = config.node;
-      var rect = node.getBoundingClientRect();
-      var width = rect.width;
-
-      this._effect = new KeyframeEffect(node, [{
-        width: (width / 2) + 'px'
-      }, {
-        width: width + 'px'
-      }], this.timingFromConfig(config));
-
-      return this._effect;
-    }
-  });
-
-  Polymer({
-    is: 'paper-menu-shrink-width-animation',
-
-    behaviors: [
-      Polymer.NeonAnimationBehavior
-    ],
-
-    configure: function(config) {
-      var node = config.node;
-      var rect = node.getBoundingClientRect();
-      var width = rect.width;
-
-      this._effect = new KeyframeEffect(node, [{
-        width: width + 'px'
-      }, {
-        width: width - (width / 20) + 'px'
-      }], this.timingFromConfig(config));
-
-      return this._effect;
-    }
-  });
-
-  Polymer({
-    is: 'paper-menu-shrink-height-animation',
-
-    behaviors: [
-      Polymer.NeonAnimationBehavior
-    ],
-
-    configure: function(config) {
-      var node = config.node;
-      var rect = node.getBoundingClientRect();
-      var height = rect.height;
-      var top = rect.top;
-
-      this.setPrefixedProperty(node, 'transformOrigin', '0 0');
-
-      this._effect = new KeyframeEffect(node, [{
-        height: height + 'px',
-        transform: 'translateY(0)'
-      }, {
-        height: height / 2 + 'px',
-        transform: 'translateY(-20px)'
-      }], this.timingFromConfig(config));
-
-      return this._effect;
-    }
-  });
+  is: 'paper-menu-grow-width-animation',
+  behaviors: [ Polymer.NeonAnimationBehavior ],
+  configure: function(config) {
+    var node = config.node;
+    var rect = node.getBoundingClientRect();
+    var width = rect.width;
+    this._effect = new KeyframeEffect(node, [ {
+      width: width / 2 + 'px'
+    }, {
+      width: width + 'px'
+    } ], this.timingFromConfig(config));
+    return this._effect;
+  }
+});
+
+Polymer({
+  is: 'paper-menu-shrink-width-animation',
+  behaviors: [ Polymer.NeonAnimationBehavior ],
+  configure: function(config) {
+    var node = config.node;
+    var rect = node.getBoundingClientRect();
+    var width = rect.width;
+    this._effect = new KeyframeEffect(node, [ {
+      width: width + 'px'
+    }, {
+      width: width - width / 20 + 'px'
+    } ], this.timingFromConfig(config));
+    return this._effect;
+  }
+});
+
+Polymer({
+  is: 'paper-menu-shrink-height-animation',
+  behaviors: [ Polymer.NeonAnimationBehavior ],
+  configure: function(config) {
+    var node = config.node;
+    var rect = node.getBoundingClientRect();
+    var height = rect.height;
+    var top = rect.top;
+    this.setPrefixedProperty(node, 'transformOrigin', '0 0');
+    this._effect = new KeyframeEffect(node, [ {
+      height: height + 'px',
+      transform: 'translateY(0)'
+    }, {
+      height: height / 2 + 'px',
+      transform: 'translateY(-20px)'
+    } ], this.timingFromConfig(config));
+    return this._effect;
+  }
+});
+
 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
-/** Same as paper-menu-button's custom easing cubic-bezier param. */
 var SLIDE_CUBIC_BEZIER = 'cubic-bezier(0.3, 0.95, 0.5, 1)';
 
 Polymer({
   is: 'cr-shared-menu',
-
-  behaviors: [Polymer.IronA11yKeysBehavior],
-
+  behaviors: [ Polymer.IronA11yKeysBehavior ],
   properties: {
     menuOpen: {
       type: Boolean,
       observer: 'menuOpenChanged_',
       value: false,
-      notify: true,
-    },
-
-    /**
-     * The contextual item that this menu was clicked for.
-     *  e.g. the data used to render an item in an <iron-list> or <dom-repeat>
-     * @type {?Object}
-     */
+      notify: true
+    },
     itemData: {
       type: Object,
-      value: null,
-    },
-
-    /** @override */
+      value: null
+    },
     keyEventTarget: {
       type: Object,
       value: function() {
         return this.$.menu;
       }
     },
-
     openAnimationConfig: {
       type: Object,
       value: function() {
-        return [{
+        return [ {
           name: 'fade-in-animation',
           timing: {
             delay: 50,
             duration: 200
           }
         }, {
           name: 'paper-menu-grow-width-animation',
           timing: {
             delay: 50,
             duration: 150,
             easing: SLIDE_CUBIC_BEZIER
           }
         }, {
           name: 'paper-menu-grow-height-animation',
           timing: {
             delay: 100,
             duration: 275,
             easing: SLIDE_CUBIC_BEZIER
           }
-        }];
+        } ];
       }
     },
-
     closeAnimationConfig: {
       type: Object,
       value: function() {
-        return [{
+        return [ {
           name: 'fade-out-animation',
           timing: {
             duration: 150
           }
-        }];
+        } ];
       }
     }
   },
-
   keyBindings: {
-    'tab': 'onTabPressed_',
-  },
-
+    tab: 'onTabPressed_'
+  },
   listeners: {
-    'dropdown.iron-overlay-canceled': 'onOverlayCanceled_',
-  },
-
-  /**
-   * The last anchor that was used to open a menu. It's necessary for toggling.
-   * @private {?Element}
-   */
+    'dropdown.iron-overlay-canceled': 'onOverlayCanceled_'
+  },
   lastAnchor_: null,
-
-  /**
-   * The first focusable child in the menu's light DOM.
-   * @private {?Element}
-   */
   firstFocus_: null,
-
-  /**
-   * The last focusable child in the menu's light DOM.
-   * @private {?Element}
-   */
   lastFocus_: null,
-
-  /** @override */
   attached: function() {
     window.addEventListener('resize', this.closeMenu.bind(this));
   },
-
-  /** Closes the menu. */
   closeMenu: function() {
     if (this.root.activeElement == null) {
-      // Something else has taken focus away from the menu. Do not attempt to
-      // restore focus to the button which opened the menu.
       this.$.dropdown.restoreFocusOnClose = false;
     }
     this.menuOpen = false;
   },
-
-  /**
-   * Opens the menu at the anchor location.
-   * @param {!Element} anchor The location to display the menu.
-   * @param {!Object} itemData The contextual item's data.
-   */
   openMenu: function(anchor, itemData) {
-    if (this.lastAnchor_ == anchor && this.menuOpen)
-      return;
-
-    if (this.menuOpen)
-      this.closeMenu();
-
+    if (this.lastAnchor_ == anchor && this.menuOpen) return;
+    if (this.menuOpen) this.closeMenu();
     this.itemData = itemData;
     this.lastAnchor_ = anchor;
     this.$.dropdown.restoreFocusOnClose = true;
-
-    var focusableChildren = Polymer.dom(this).querySelectorAll(
-        '[tabindex]:not([hidden]),button:not([hidden])');
+    var focusableChildren = Polymer.dom(this).querySelectorAll('[tabindex]:not([hidden]),button:not([hidden])');
     if (focusableChildren.length > 0) {
       this.$.dropdown.focusTarget = focusableChildren[0];
       this.firstFocus_ = focusableChildren[0];
       this.lastFocus_ = focusableChildren[focusableChildren.length - 1];
     }
-
-    // Move the menu to the anchor.
     this.$.dropdown.positionTarget = anchor;
     this.menuOpen = true;
   },
-
-  /**
-   * Toggles the menu for the anchor that is passed in.
-   * @param {!Element} anchor The location to display the menu.
-   * @param {!Object} itemData The contextual item's data.
-   */
   toggleMenu: function(anchor, itemData) {
-    if (anchor == this.lastAnchor_ && this.menuOpen)
-      this.closeMenu();
-    else
-      this.openMenu(anchor, itemData);
-  },
-
-  /**
-   * Trap focus inside the menu. As a very basic heuristic, will wrap focus from
-   * the first element with a nonzero tabindex to the last such element.
-   * TODO(tsergeant): Use iron-focus-wrap-behavior once it is available
-   * (https://github.com/PolymerElements/iron-overlay-behavior/issues/179).
-   * @param {CustomEvent} e
-   */
+    if (anchor == this.lastAnchor_ && this.menuOpen) this.closeMenu(); else this.openMenu(anchor, itemData);
+  },
   onTabPressed_: function(e) {
-    if (!this.firstFocus_ || !this.lastFocus_)
-      return;
-
+    if (!this.firstFocus_ || !this.lastFocus_) return;
     var toFocus;
     var keyEvent = e.detail.keyboardEvent;
-    if (keyEvent.shiftKey && keyEvent.target == this.firstFocus_)
-      toFocus = this.lastFocus_;
-    else if (keyEvent.target == this.lastFocus_)
-      toFocus = this.firstFocus_;
-
-    if (!toFocus)
-      return;
-
+    if (keyEvent.shiftKey && keyEvent.target == this.firstFocus_) toFocus = this.lastFocus_; else if (keyEvent.target == this.lastFocus_) toFocus = this.firstFocus_;
+    if (!toFocus) return;
     e.preventDefault();
     toFocus.focus();
   },
-
-  /**
-   * Ensure the menu is reset properly when it is closed by the dropdown (eg,
-   * clicking outside).
-   * @private
-   */
   menuOpenChanged_: function() {
     if (!this.menuOpen) {
       this.itemData = null;
       this.lastAnchor_ = null;
     }
   },
-
-  /**
-   * Prevent focus restoring when tapping outside the menu. This stops the
-   * focus moving around unexpectedly when closing the menu with the mouse.
-   * @param {CustomEvent} e
-   * @private
-   */
   onOverlayCanceled_: function(e) {
-    if (e.detail.type == 'tap')
-      this.$.dropdown.restoreFocusOnClose = false;
-  },
-});
-/** @polymerBehavior Polymer.PaperItemBehavior */
-  Polymer.PaperItemBehaviorImpl = {
-    hostAttributes: {
-      role: 'option',
-      tabindex: '0'
-    }
-  };
-
-  /** @polymerBehavior */
-  Polymer.PaperItemBehavior = [
-    Polymer.IronButtonState,
-    Polymer.IronControlState,
-    Polymer.PaperItemBehaviorImpl
-  ];
+    if (e.detail.type == 'tap') this.$.dropdown.restoreFocusOnClose = false;
+  }
+});
+
+Polymer.PaperItemBehaviorImpl = {
+  hostAttributes: {
+    role: 'option',
+    tabindex: '0'
+  }
+};
+
+Polymer.PaperItemBehavior = [ Polymer.IronButtonState, Polymer.IronControlState, Polymer.PaperItemBehaviorImpl ];
+
 Polymer({
-      is: 'paper-item',
-
-      behaviors: [
-        Polymer.PaperItemBehavior
-      ]
-    });
+  is: 'paper-item',
+  behaviors: [ Polymer.PaperItemBehavior ]
+});
+
 Polymer({
-
-    is: 'iron-collapse',
-
-    behaviors: [
-      Polymer.IronResizableBehavior
-    ],
-
-    properties: {
-
-      /**
-       * If true, the orientation is horizontal; otherwise is vertical.
-       *
-       * @attribute horizontal
-       */
-      horizontal: {
-        type: Boolean,
-        value: false,
-        observer: '_horizontalChanged'
-      },
-
-      /**
-       * Set opened to true to show the collapse element and to false to hide it.
-       *
-       * @attribute opened
-       */
-      opened: {
-        type: Boolean,
-        value: false,
-        notify: true,
-        observer: '_openedChanged'
-      },
-
-      /**
-       * Set noAnimation to true to disable animations
-       *
-       * @attribute noAnimation
-       */
-      noAnimation: {
-        type: Boolean
-      },
-
-    },
-
-    get dimension() {
-      return this.horizontal ? 'width' : 'height';
-    },
-
-    /**
-     * `maxWidth` or `maxHeight`.
-     * @private
-     */
-    get _dimensionMax() {
-      return this.horizontal ? 'maxWidth' : 'maxHeight';
-    },
-
-    /**
-     * `max-width` or `max-height`.
-     * @private
-     */
-    get _dimensionMaxCss() {
-      return this.horizontal ? 'max-width' : 'max-height';
-    },
-
-    hostAttributes: {
-      role: 'group',
-      'aria-hidden': 'true',
-      'aria-expanded': 'false'
-    },
-
-    listeners: {
-      transitionend: '_transitionEnd'
-    },
-
-    attached: function() {
-      // It will take care of setting correct classes and styles.
-      this._transitionEnd();
-    },
-
-    /**
-     * Toggle the opened state.
-     *
-     * @method toggle
-     */
-    toggle: function() {
-      this.opened = !this.opened;
-    },
-
-    show: function() {
-      this.opened = true;
-    },
-
-    hide: function() {
-      this.opened = false;
-    },
-
-    /**
-     * Updates the size of the element.
-     * @param {string} size The new value for `maxWidth`/`maxHeight` as css property value, usually `auto` or `0px`.
-     * @param {boolean=} animated if `true` updates the size with an animation, otherwise without.
-     */
-    updateSize: function(size, animated) {
-      // No change!
-      var curSize = this.style[this._dimensionMax];
-      if (curSize === size || (size === 'auto' && !curSize)) {
-        return;
-      }
-
-      this._updateTransition(false);
-      // If we can animate, must do some prep work.
-      if (animated && !this.noAnimation && this._isDisplayed) {
-        // Animation will start at the current size.
-        var startSize = this._calcSize();
-        // For `auto` we must calculate what is the final size for the animation.
-        // After the transition is done, _transitionEnd will set the size back to `auto`.
-        if (size === 'auto') {
-          this.style[this._dimensionMax] = '';
-          size = this._calcSize();
-        }
-        // Go to startSize without animation.
-        this.style[this._dimensionMax] = startSize;
-        // Force layout to ensure transition will go. Set scrollTop to itself
-        // so that compilers won't remove it.
-        this.scrollTop = this.scrollTop;
-        // Enable animation.
-        this._updateTransition(true);
-      }
-      // Set the final size.
+  is: 'iron-collapse',
+  behaviors: [ Polymer.IronResizableBehavior ],
+  properties: {
+    horizontal: {
+      type: Boolean,
+      value: false,
+      observer: '_horizontalChanged'
+    },
+    opened: {
+      type: Boolean,
+      value: false,
+      notify: true,
+      observer: '_openedChanged'
+    },
+    noAnimation: {
+      type: Boolean
+    }
+  },
+  get dimension() {
+    return this.horizontal ? 'width' : 'height';
+  },
+  get _dimensionMax() {
+    return this.horizontal ? 'maxWidth' : 'maxHeight';
+  },
+  get _dimensionMaxCss() {
+    return this.horizontal ? 'max-width' : 'max-height';
+  },
+  hostAttributes: {
+    role: 'group',
+    'aria-hidden': 'true',
+    'aria-expanded': 'false'
+  },
+  listeners: {
+    transitionend: '_transitionEnd'
+  },
+  attached: function() {
+    this._transitionEnd();
+  },
+  toggle: function() {
+    this.opened = !this.opened;
+  },
+  show: function() {
+    this.opened = true;
+  },
+  hide: function() {
+    this.opened = false;
+  },
+  updateSize: function(size, animated) {
+    var curSize = this.style[this._dimensionMax];
+    if (curSize === size || size === 'auto' && !curSize) {
+      return;
+    }
+    this._updateTransition(false);
+    if (animated && !this.noAnimation && this._isDisplayed) {
+      var startSize = this._calcSize();
       if (size === 'auto') {
         this.style[this._dimensionMax] = '';
+        size = this._calcSize();
+      }
+      this.style[this._dimensionMax] = startSize;
+      this.scrollTop = this.scrollTop;
+      this._updateTransition(true);
+    }
+    if (size === 'auto') {
+      this.style[this._dimensionMax] = '';
+    } else {
+      this.style[this._dimensionMax] = size;
+    }
+  },
+  enableTransition: function(enabled) {
+    Polymer.Base._warn('`enableTransition()` is deprecated, use `noAnimation` instead.');
+    this.noAnimation = !enabled;
+  },
+  _updateTransition: function(enabled) {
+    this.style.transitionDuration = enabled && !this.noAnimation ? '' : '0s';
+  },
+  _horizontalChanged: function() {
+    this.style.transitionProperty = this._dimensionMaxCss;
+    var otherDimension = this._dimensionMax === 'maxWidth' ? 'maxHeight' : 'maxWidth';
+    this.style[otherDimension] = '';
+    this.updateSize(this.opened ? 'auto' : '0px', false);
+  },
+  _openedChanged: function() {
+    this.setAttribute('aria-expanded', this.opened);
+    this.setAttribute('aria-hidden', !this.opened);
+    this.toggleClass('iron-collapse-closed', false);
+    this.toggleClass('iron-collapse-opened', false);
+    this.updateSize(this.opened ? 'auto' : '0px', true);
+    if (this.opened) {
+      this.focus();
+    }
+    if (this.noAnimation) {
+      this._transitionEnd();
+    }
+  },
+  _transitionEnd: function() {
+    if (this.opened) {
+      this.style[this._dimensionMax] = '';
+    }
+    this.toggleClass('iron-collapse-closed', !this.opened);
+    this.toggleClass('iron-collapse-opened', this.opened);
+    this._updateTransition(false);
+    this.notifyResize();
+  },
+  get _isDisplayed() {
+    var rect = this.getBoundingClientRect();
+    for (var prop in rect) {
+      if (rect[prop] !== 0) return true;
+    }
+    return false;
+  },
+  _calcSize: function() {
+    return this.getBoundingClientRect()[this.dimension] + 'px';
+  }
+});
+
+Polymer.IronFormElementBehavior = {
+  properties: {
+    name: {
+      type: String
+    },
+    value: {
+      notify: true,
+      type: String
+    },
+    required: {
+      type: Boolean,
+      value: false
+    },
+    _parentForm: {
+      type: Object
+    }
+  },
+  attached: function() {
+    this.fire('iron-form-element-register');
+  },
+  detached: function() {
+    if (this._parentForm) {
+      this._parentForm.fire('iron-form-element-unregister', {
+        target: this
+      });
+    }
+  }
+};
+
+Polymer.IronCheckedElementBehaviorImpl = {
+  properties: {
+    checked: {
+      type: Boolean,
+      value: false,
+      reflectToAttribute: true,
+      notify: true,
+      observer: '_checkedChanged'
+    },
+    toggles: {
+      type: Boolean,
+      value: true,
+      reflectToAttribute: true
+    },
+    value: {
+      type: String,
+      value: 'on',
+      observer: '_valueChanged'
+    }
+  },
+  observers: [ '_requiredChanged(required)' ],
+  created: function() {
+    this._hasIronCheckedElementBehavior = true;
+  },
+  _getValidity: function(_value) {
+    return this.disabled || !this.required || this.checked;
+  },
+  _requiredChanged: function() {
+    if (this.required) {
+      this.setAttribute('aria-required', 'true');
+    } else {
+      this.removeAttribute('aria-required');
+    }
+  },
+  _checkedChanged: function() {
+    this.active = this.checked;
+    this.fire('iron-change');
+  },
+  _valueChanged: function() {
+    if (this.value === undefined || this.value === null) {
+      this.value = 'on';
+    }
+  }
+};
+
+Polymer.IronCheckedElementBehavior = [ Polymer.IronFormElementBehavior, Polymer.IronValidatableBehavior, Polymer.IronCheckedElementBehaviorImpl ];
+
+Polymer.PaperCheckedElementBehaviorImpl = {
+  _checkedChanged: function() {
+    Polymer.IronCheckedElementBehaviorImpl._checkedChanged.call(this);
+    if (this.hasRipple()) {
+      if (this.checked) {
+        this._ripple.setAttribute('checked', '');
       } else {
-        this.style[this._dimensionMax] = size;
+        this._ripple.removeAttribute('checked');
       }
-    },
-
-    /**
-     * enableTransition() is deprecated, but left over so it doesn't break existing code.
-     * Please use `noAnimation` property instead.
-     *
-     * @method enableTransition
-     * @deprecated since version 1.0.4
-     */
-    enableTransition: function(enabled) {
-      Polymer.Base._warn('`enableTransition()` is deprecated, use `noAnimation` instead.');
-      this.noAnimation = !enabled;
-    },
-
-    _updateTransition: function(enabled) {
-      this.style.transitionDuration = (enabled && !this.noAnimation) ? '' : '0s';
-    },
-
-    _horizontalChanged: function() {
-      this.style.transitionProperty = this._dimensionMaxCss;
-      var otherDimension = this._dimensionMax === 'maxWidth' ? 'maxHeight' : 'maxWidth';
-      this.style[otherDimension] = '';
-      this.updateSize(this.opened ? 'auto' : '0px', false);
-    },
-
-    _openedChanged: function() {
-      this.setAttribute('aria-expanded', this.opened);
-      this.setAttribute('aria-hidden', !this.opened);
-
-      this.toggleClass('iron-collapse-closed', false);
-      this.toggleClass('iron-collapse-opened', false);
-      this.updateSize(this.opened ? 'auto' : '0px', true);
-
-      // Focus the current collapse.
-      if (this.opened) {
-        this.focus();
-      }
-      if (this.noAnimation) {
-        this._transitionEnd();
-      }
-    },
-
-    _transitionEnd: function() {
-      if (this.opened) {
-        this.style[this._dimensionMax] = '';
-      }
-      this.toggleClass('iron-collapse-closed', !this.opened);
-      this.toggleClass('iron-collapse-opened', this.opened);
-      this._updateTransition(false);
-      this.notifyResize();
-    },
-
-    /**
-     * Simplistic heuristic to detect if element has a parent with display: none
-     *
-     * @private
-     */
-    get _isDisplayed() {
-      var rect = this.getBoundingClientRect();
-      for (var prop in rect) {
-        if (rect[prop] !== 0) return true;
-      }
-      return false;
-    },
-
-    _calcSize: function() {
-      return this.getBoundingClientRect()[this.dimension] + 'px';
-    }
-
-  });
-/**
-  Polymer.IronFormElementBehavior enables a custom element to be included
-  in an `iron-form`.
-
-  @demo demo/index.html
-  @polymerBehavior
-  */
-  Polymer.IronFormElementBehavior = {
-
-    properties: {
-      /**
-       * Fired when the element is added to an `iron-form`.
-       *
-       * @event iron-form-element-register
-       */
-
-      /**
-       * Fired when the element is removed from an `iron-form`.
-       *
-       * @event iron-form-element-unregister
-       */
-
-      /**
-       * The name of this element.
-       */
-      name: {
-        type: String
-      },
-
-      /**
-       * The value for this element.
-       */
-      value: {
-        notify: true,
-        type: String
-      },
-
-      /**
-       * Set to true to mark the input as required. If used in a form, a
-       * custom element that uses this behavior should also use
-       * Polymer.IronValidatableBehavior and define a custom validation method.
-       * Otherwise, a `required` element will always be considered valid.
-       * It's also strongly recommended to provide a visual style for the element
-       * when its value is invalid.
-       */
-      required: {
-        type: Boolean,
-        value: false
-      },
-
-      /**
-       * The form that the element is registered to.
-       */
-      _parentForm: {
-        type: Object
-      }
-    },
-
-    attached: function() {
-      // Note: the iron-form that this element belongs to will set this
-      // element's _parentForm property when handling this event.
-      this.fire('iron-form-element-register');
-    },
-
-    detached: function() {
-      if (this._parentForm) {
-        this._parentForm.fire('iron-form-element-unregister', {target: this});
-      }
-    }
-
-  };
-/**
-   * Use `Polymer.IronCheckedElementBehavior` to implement a custom element
-   * that has a `checked` property, which can be used for validation if the
-   * element is also `required`. Element instances implementing this behavior
-   * will also be registered for use in an `iron-form` element.
-   *
-   * @demo demo/index.html
-   * @polymerBehavior Polymer.IronCheckedElementBehavior
-   */
-  Polymer.IronCheckedElementBehaviorImpl = {
-
-    properties: {
-      /**
-       * Fired when the checked state changes.
-       *
-       * @event iron-change
-       */
-
-      /**
-       * Gets or sets the state, `true` is checked and `false` is unchecked.
-       */
-      checked: {
-        type: Boolean,
-        value: false,
-        reflectToAttribute: true,
-        notify: true,
-        observer: '_checkedChanged'
-      },
-
-      /**
-       * If true, the button toggles the active state with each tap or press
-       * of the spacebar.
-       */
-      toggles: {
-        type: Boolean,
-        value: true,
-        reflectToAttribute: true
-      },
-
-      /* Overriden from Polymer.IronFormElementBehavior */
-      value: {
-        type: String,
-        value: 'on',
-        observer: '_valueChanged'
-      }
-    },
-
-    observers: [
-      '_requiredChanged(required)'
-    ],
-
-    created: function() {
-      // Used by `iron-form` to handle the case that an element with this behavior
-      // doesn't have a role of 'checkbox' or 'radio', but should still only be
-      // included when the form is serialized if `this.checked === true`.
-      this._hasIronCheckedElementBehavior = true;
-    },
-
-    /**
-     * Returns false if the element is required and not checked, and true otherwise.
-     * @param {*=} _value Ignored.
-     * @return {boolean} true if `required` is false or if `checked` is true.
-     */
-    _getValidity: function(_value) {
-      return this.disabled || !this.required || this.checked;
-    },
-
-    /**
-     * Update the aria-required label when `required` is changed.
-     */
-    _requiredChanged: function() {
-      if (this.required) {
-        this.setAttribute('aria-required', 'true');
-      } else {
-        this.removeAttribute('aria-required');
-      }
-    },
-
-    /**
-     * Fire `iron-changed` when the checked state changes.
-     */
-    _checkedChanged: function() {
-      this.active = this.checked;
-      this.fire('iron-change');
-    },
-
-    /**
-     * Reset value to 'on' if it is set to `undefined`.
-     */
-    _valueChanged: function() {
-      if (this.value === undefined || this.value === null) {
-        this.value = 'on';
-      }
-    }
-  };
-
-  /** @polymerBehavior Polymer.IronCheckedElementBehavior */
-  Polymer.IronCheckedElementBehavior = [
-    Polymer.IronFormElementBehavior,
-    Polymer.IronValidatableBehavior,
-    Polymer.IronCheckedElementBehaviorImpl
-  ];
-/**
-   * Use `Polymer.PaperCheckedElementBehavior` to implement a custom element
-   * that has a `checked` property similar to `Polymer.IronCheckedElementBehavior`
-   * and is compatible with having a ripple effect.
-   * @polymerBehavior Polymer.PaperCheckedElementBehavior
-   */
-  Polymer.PaperCheckedElementBehaviorImpl = {
-    /**
-     * Synchronizes the element's checked state with its ripple effect.
-     */
-    _checkedChanged: function() {
-      Polymer.IronCheckedElementBehaviorImpl._checkedChanged.call(this);
-      if (this.hasRipple()) {
-        if (this.checked) {
-          this._ripple.setAttribute('checked', '');
-        } else {
-          this._ripple.removeAttribute('checked');
-        }
-      }
-    },
-
-    /**
-     * Synchronizes the element's `active` and `checked` state.
-     */
-    _buttonStateChanged: function() {
-      Polymer.PaperRippleBehavior._buttonStateChanged.call(this);
-      if (this.disabled) {
-        return;
-      }
-      if (this.isAttached) {
-        this.checked = this.active;
-      }
-    }
-  };
-
-  /** @polymerBehavior Polymer.PaperCheckedElementBehavior */
-  Polymer.PaperCheckedElementBehavior = [
-    Polymer.PaperInkyFocusBehavior,
-    Polymer.IronCheckedElementBehavior,
-    Polymer.PaperCheckedElementBehaviorImpl
-  ];
+    }
+  },
+  _buttonStateChanged: function() {
+    Polymer.PaperRippleBehavior._buttonStateChanged.call(this);
+    if (this.disabled) {
+      return;
+    }
+    if (this.isAttached) {
+      this.checked = this.active;
+    }
+  }
+};
+
+Polymer.PaperCheckedElementBehavior = [ Polymer.PaperInkyFocusBehavior, Polymer.IronCheckedElementBehavior, Polymer.PaperCheckedElementBehaviorImpl ];
+
 Polymer({
-      is: 'paper-checkbox',
-
-      behaviors: [
-        Polymer.PaperCheckedElementBehavior
-      ],
-
-      hostAttributes: {
-        role: 'checkbox',
-        'aria-checked': false,
-        tabindex: 0
-      },
-
-      properties: {
-        /**
-         * Fired when the checked state changes due to user interaction.
-         *
-         * @event change
-         */
-
-        /**
-         * Fired when the checked state changes.
-         *
-         * @event iron-change
-         */
-        ariaActiveAttribute: {
-          type: String,
-          value: 'aria-checked'
-        }
-      },
-
-      _computeCheckboxClass: function(checked, invalid) {
-        var className = '';
-        if (checked) {
-          className += 'checked ';
-        }
-        if (invalid) {
-          className += 'invalid';
-        }
-        return className;
-      },
-
-      _computeCheckmarkClass: function(checked) {
-        return checked ? '' : 'hidden';
-      },
-
-      // create ripple inside the checkboxContainer
-      _createRipple: function() {
-        this._rippleContainer = this.$.checkboxContainer;
-        return Polymer.PaperInkyFocusBehaviorImpl._createRipple.call(this);
-      }
-
-    });
+  is: 'paper-checkbox',
+  behaviors: [ Polymer.PaperCheckedElementBehavior ],
+  hostAttributes: {
+    role: 'checkbox',
+    'aria-checked': false,
+    tabindex: 0
+  },
+  properties: {
+    ariaActiveAttribute: {
+      type: String,
+      value: 'aria-checked'
+    }
+  },
+  _computeCheckboxClass: function(checked, invalid) {
+    var className = '';
+    if (checked) {
+      className += 'checked ';
+    }
+    if (invalid) {
+      className += 'invalid';
+    }
+    return className;
+  },
+  _computeCheckmarkClass: function(checked) {
+    return checked ? '' : 'hidden';
+  },
+  _createRipple: function() {
+    this._rippleContainer = this.$.checkboxContainer;
+    return Polymer.PaperInkyFocusBehaviorImpl._createRipple.call(this);
+  }
+});
+
 Polymer({
-      is: 'paper-icon-button-light',
-      extends: 'button',
-
-      behaviors: [
-        Polymer.PaperRippleBehavior
-      ],
-
-      listeners: {
-        'down': '_rippleDown',
-        'up': '_rippleUp',
-        'focus': '_rippleDown',
-        'blur': '_rippleUp',
-      },
-
-      _rippleDown: function() {
-        this.getRipple().downAction();
-      },
-
-      _rippleUp: function() {
-        this.getRipple().upAction();
-      },
-
-      /**
-       * @param {...*} var_args
-       */
-      ensureRipple: function(var_args) {
-        var lastRipple = this._ripple;
-        Polymer.PaperRippleBehavior.ensureRipple.apply(this, arguments);
-        if (this._ripple && this._ripple !== lastRipple) {
-          this._ripple.center = true;
-          this._ripple.classList.add('circle');
-        }
-      }
-    });
+  is: 'paper-icon-button-light',
+  "extends": 'button',
+  behaviors: [ Polymer.PaperRippleBehavior ],
+  listeners: {
+    down: '_rippleDown',
+    up: '_rippleUp',
+    focus: '_rippleDown',
+    blur: '_rippleUp'
+  },
+  _rippleDown: function() {
+    this.getRipple().downAction();
+  },
+  _rippleUp: function() {
+    this.getRipple().upAction();
+  },
+  ensureRipple: function(var_args) {
+    var lastRipple = this._ripple;
+    Polymer.PaperRippleBehavior.ensureRipple.apply(this, arguments);
+    if (this._ripple && this._ripple !== lastRipple) {
+      this._ripple.center = true;
+      this._ripple.classList.add('circle');
+    }
+  }
+});
+
 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
 cr.define('cr.icon', function() {
-  /**
-   * @return {!Array<number>} The scale factors supported by this platform for
-   *     webui resources.
-   */
   function getSupportedScaleFactors() {
     var supportedScaleFactors = [];
     if (cr.isMac || cr.isChromeOS || cr.isWindows || cr.isLinux) {
-      // All desktop platforms support zooming which also updates the
-      // renderer's device scale factors (a.k.a devicePixelRatio), and
-      // these platforms has high DPI assets for 2.0x. Use 1x and 2x in
-      // image-set on these platforms so that the renderer can pick the
-      // closest image for the current device scale factor.
       supportedScaleFactors.push(1);
       supportedScaleFactors.push(2);
     } else {
-      // For other platforms that use fixed device scale factor, use
-      // the window's device pixel ratio.
-      // TODO(oshima): Investigate if Android/iOS need to use image-set.
       supportedScaleFactors.push(window.devicePixelRatio);
     }
     return supportedScaleFactors;
   }
-
-  /**
-   * Returns the URL of the image, or an image set of URLs for the profile
-   * avatar. Default avatars have resources available for multiple scalefactors,
-   * whereas the GAIA profile image only comes in one size.
-   *
-   * @param {string} path The path of the image.
-   * @return {string} The url, or an image set of URLs of the avatar image.
-   */
   function getProfileAvatarIcon(path) {
     var chromeThemePath = 'chrome://theme';
-    var isDefaultAvatar =
-        (path.slice(0, chromeThemePath.length) == chromeThemePath);
-    return isDefaultAvatar ? imageset(path + '@scalefactorx'): url(path);
-  }
-
-  /**
-   * Generates a CSS -webkit-image-set for a chrome:// url.
-   * An entry in the image set is added for each of getSupportedScaleFactors().
-   * The scale-factor-specific url is generated by replacing the first instance
-   * of 'scalefactor' in |path| with the numeric scale factor.
-   * @param {string} path The URL to generate an image set for.
-   *     'scalefactor' should be a substring of |path|.
-   * @return {string} The CSS -webkit-image-set.
-   */
+    var isDefaultAvatar = path.slice(0, chromeThemePath.length) == chromeThemePath;
+    return isDefaultAvatar ? imageset(path + '@scalefactorx') : url(path);
+  }
   function imageset(path) {
     var supportedScaleFactors = getSupportedScaleFactors();
-
     var replaceStartIndex = path.indexOf('scalefactor');
-    if (replaceStartIndex < 0)
-      return url(path);
-
+    if (replaceStartIndex < 0) return url(path);
     var s = '';
     for (var i = 0; i < supportedScaleFactors.length; ++i) {
       var scaleFactor = supportedScaleFactors[i];
-      var pathWithScaleFactor = path.substr(0, replaceStartIndex) +
-          scaleFactor + path.substr(replaceStartIndex + 'scalefactor'.length);
-
+      var pathWithScaleFactor = path.substr(0, replaceStartIndex) + scaleFactor + path.substr(replaceStartIndex + 'scalefactor'.length);
       s += url(pathWithScaleFactor) + ' ' + scaleFactor + 'x';
-
-      if (i != supportedScaleFactors.length - 1)
-        s += ', ';
+      if (i != supportedScaleFactors.length - 1) s += ', ';
     }
     return '-webkit-image-set(' + s + ')';
   }
-
-  /**
-   * A regular expression for identifying favicon URLs.
-   * @const {!RegExp}
-   */
   var FAVICON_URL_REGEX = /\.ico$/i;
-
-  /**
-   * Creates a CSS -webkit-image-set for a favicon request.
-   * @param {string} url Either the URL of the original page or of the favicon
-   *     itself.
-   * @param {number=} opt_size Optional preferred size of the favicon.
-   * @param {string=} opt_type Optional type of favicon to request. Valid values
-   *     are 'favicon' and 'touch-icon'. Default is 'favicon'.
-   * @return {string} -webkit-image-set for the favicon.
-   */
   function getFaviconImageSet(url, opt_size, opt_type) {
     var size = opt_size || 16;
     var type = opt_type || 'favicon';
-
-    return imageset(
-        'chrome://' + type + '/size/' + size + '@scalefactorx/' +
-        // Note: Literal 'iconurl' must match |kIconURLParameter| in
-        // components/favicon_base/favicon_url_parser.cc.
-        (FAVICON_URL_REGEX.test(url) ? 'iconurl/' : '') + url);
-  }
-
+    return imageset('chrome://' + type + '/size/' + size + '@scalefactorx/' + (FAVICON_URL_REGEX.test(url) ? 'iconurl/' : '') + url);
+  }
   return {
     getSupportedScaleFactors: getSupportedScaleFactors,
     getProfileAvatarIcon: getProfileAvatarIcon,
-    getFaviconImageSet: getFaviconImageSet,
+    getFaviconImageSet: getFaviconImageSet
   };
 });
+
 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
-/**
- * @fileoverview Defines a singleton object, md_history.BrowserService, which
- * provides access to chrome.send APIs.
- */
-
 cr.define('md_history', function() {
-  /** @constructor */
   function BrowserService() {
-    /** @private {Array<!HistoryEntry>} */
     this.pendingDeleteItems_ = null;
-    /** @private {PromiseResolver} */
     this.pendingDeletePromise_ = null;
   }
-
   BrowserService.prototype = {
-    /**
-     * @param {!Array<!HistoryEntry>} items
-     * @return {Promise<!Array<!HistoryEntry>>}
-     */
     deleteItems: function(items) {
       if (this.pendingDeleteItems_ != null) {
-        // There's already a deletion in progress, reject immediately.
-        return new Promise(function(resolve, reject) { reject(items); });
+        return new Promise(function(resolve, reject) {
+          reject(items);
+        });
       }
-
       var removalList = items.map(function(item) {
         return {
           url: item.url,
           timestamps: item.allTimestamps
         };
       });
-
       this.pendingDeleteItems_ = items;
       this.pendingDeletePromise_ = new PromiseResolver();
-
       chrome.send('removeVisits', removalList);
-
       return this.pendingDeletePromise_.promise;
     },
-
-    /**
-     * @param {!string} url
-     */
     removeBookmark: function(url) {
-      chrome.send('removeBookmark', [url]);
-    },
-
-    /**
-     * @param {string} sessionTag
-     */
+      chrome.send('removeBookmark', [ url ]);
+    },
     openForeignSessionAllTabs: function(sessionTag) {
-      chrome.send('openForeignSession', [sessionTag]);
-    },
-
-    /**
-     * @param {string} sessionTag
-     * @param {number} windowId
-     * @param {number} tabId
-     * @param {MouseEvent} e
-     */
+      chrome.send('openForeignSession', [ sessionTag ]);
+    },
     openForeignSessionTab: function(sessionTag, windowId, tabId, e) {
-      chrome.send('openForeignSession', [
-        sessionTag, String(windowId), String(tabId), e.button || 0, e.altKey,
-        e.ctrlKey, e.metaKey, e.shiftKey
-      ]);
-    },
-
-    /**
-     * @param {string} sessionTag
-     */
+      chrome.send('openForeignSession', [ sessionTag, String(windowId), String(tabId), e.button || 0, e.altKey, e.ctrlKey, e.metaKey, e.shiftKey ]);
+    },
     deleteForeignSession: function(sessionTag) {
-      chrome.send('deleteForeignSession', [sessionTag]);
-    },
-
+      chrome.send('deleteForeignSession', [ sessionTag ]);
+    },
     openClearBrowsingData: function() {
       chrome.send('clearBrowsingData');
     },
-
-    /**
-    * Record an action in UMA.
-    * @param {string} actionDesc The name of the action to be logged.
-    */
     recordAction: function(actionDesc) {
-      chrome.send('metricsHandler:recordAction', [actionDesc]);
-    },
-
-    /**
-     * @param {boolean} successful
-     * @private
-     */
+      chrome.send('metricsHandler:recordAction', [ actionDesc ]);
+    },
     resolveDelete_: function(successful) {
-      if (this.pendingDeleteItems_ == null ||
-          this.pendingDeletePromise_ == null) {
+      if (this.pendingDeleteItems_ == null || this.pendingDeletePromise_ == null) {
         return;
       }
-
-      if (successful)
-        this.pendingDeletePromise_.resolve(this.pendingDeleteItems_);
-      else
-        this.pendingDeletePromise_.reject(this.pendingDeleteItems_);
-
+      if (successful) this.pendingDeletePromise_.resolve(this.pendingDeleteItems_); else this.pendingDeletePromise_.reject(this.pendingDeleteItems_);
       this.pendingDeleteItems_ = null;
       this.pendingDeletePromise_ = null;
-    },
+    }
   };
-
   cr.addSingletonGetter(BrowserService);
-
-  return {BrowserService: BrowserService};
-});
-
-/**
- * Called by the history backend when deletion was succesful.
- */
+  return {
+    BrowserService: BrowserService
+  };
+});
+
 function deleteComplete() {
   md_history.BrowserService.getInstance().resolveDelete_(true);
 }
 
-/**
- * Called by the history backend when the deletion failed.
- */
 function deleteFailed() {
   md_history.BrowserService.getInstance().resolveDelete_(false);
-};
+}
+
 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
 Polymer({
   is: 'history-searched-label',
-
   properties: {
-    // The text to show in this label.
     title: String,
-
-    // The search term to bold within the title.
-    searchTerm: String,
-  },
-
-  observers: ['setSearchedTextToBold_(title, searchTerm)'],
-
-  /**
-   * Updates the page title. If a search term is specified, highlights any
-   * occurrences of the search term in bold.
-   * @private
-   */
+    searchTerm: String
+  },
+  observers: [ 'setSearchedTextToBold_(title, searchTerm)' ],
   setSearchedTextToBold_: function() {
     var i = 0;
     var titleElem = this.$.container;
     var titleText = this.title;
-
     if (this.searchTerm == '' || this.searchTerm == null) {
       titleElem.textContent = titleText;
       return;
     }
-
     var re = new RegExp(quoteString(this.searchTerm), 'gim');
     var match;
     titleElem.textContent = '';
     while (match = re.exec(titleText)) {
-      if (match.index > i)
-        titleElem.appendChild(document.createTextNode(
-            titleText.slice(i, match.index)));
+      if (match.index > i) titleElem.appendChild(document.createTextNode(titleText.slice(i, match.index)));
       i = re.lastIndex;
-      // Mark the highlighted text in bold.
       var b = document.createElement('b');
       b.textContent = titleText.substring(match.index, i);
       titleElem.appendChild(b);
     }
-    if (i < titleText.length)
-      titleElem.appendChild(
-          document.createTextNode(titleText.slice(i)));
-  },
-});
+    if (i < titleText.length) titleElem.appendChild(document.createTextNode(titleText.slice(i)));
+  }
+});
+
 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
 cr.define('md_history', function() {
   var HistoryItem = Polymer({
     is: 'history-item',
-
     properties: {
-      // Underlying HistoryEntry data for this item. Contains read-only fields
-      // from the history backend, as well as fields computed by history-list.
-      item: {type: Object, observer: 'showIcon_'},
-
-      // Search term used to obtain this history-item.
-      searchTerm: {type: String},
-
-      selected: {type: Boolean, notify: true},
-
-      isFirstItem: {type: Boolean, reflectToAttribute: true},
-
-      isCardStart: {type: Boolean, reflectToAttribute: true},
-
-      isCardEnd: {type: Boolean, reflectToAttribute: true},
-
-      // True if the item is being displayed embedded in another element and
-      // should not manage its own borders or size.
-      embedded: {type: Boolean, reflectToAttribute: true},
-
-      hasTimeGap: {type: Boolean},
-
-      numberOfItems: {type: Number},
-
-      // The path of this history item inside its parent.
-      path: String,
-    },
-
-    /**
-     * When a history-item is selected the toolbar is notified and increases
-     * or decreases its count of selected items accordingly.
-     * @param {MouseEvent} e
-     * @private
-     */
+      item: {
+        type: Object,
+        observer: 'showIcon_'
+      },
+      searchTerm: {
+        type: String
+      },
+      selected: {
+        type: Boolean,
+        notify: true
+      },
+      isFirstItem: {
+        type: Boolean,
+        reflectToAttribute: true
+      },
+      isCardStart: {
+        type: Boolean,
+        reflectToAttribute: true
+      },
+      isCardEnd: {
+        type: Boolean,
+        reflectToAttribute: true
+      },
+      embedded: {
+        type: Boolean,
+        reflectToAttribute: true
+      },
+      hasTimeGap: {
+        type: Boolean
+      },
+      numberOfItems: {
+        type: Number
+      },
+      path: String
+    },
     onCheckboxSelected_: function(e) {
-      // TODO(calamity): Fire this event whenever |selected| changes.
       this.fire('history-checkbox-select', {
         element: this,
-        shiftKey: e.shiftKey,
+        shiftKey: e.shiftKey
       });
       e.preventDefault();
     },
-
-    /**
-     * @param {MouseEvent} e
-     * @private
-     */
     onCheckboxMousedown_: function(e) {
-      // Prevent shift clicking a checkbox from selecting text.
-      if (e.shiftKey)
-        e.preventDefault();
-    },
-
-    /**
-     * Remove bookmark of current item when bookmark-star is clicked.
-     * @private
-     */
+      if (e.shiftKey) e.preventDefault();
+    },
     onRemoveBookmarkTap_: function() {
-      if (!this.item.starred)
-        return;
-
-      if (this.$$('#bookmark-star') == this.root.activeElement)
-        this.$['menu-button'].focus();
-
-      md_history.BrowserService.getInstance()
-        .removeBookmark(this.item.url);
+      if (!this.item.starred) return;
+      if (this.$$('#bookmark-star') == this.root.activeElement) this.$['menu-button'].focus();
+      md_history.BrowserService.getInstance().removeBookmark(this.item.url);
       this.fire('remove-bookmark-stars', this.item.url);
     },
-
-    /**
-     * Fires a custom event when the menu button is clicked. Sends the details
-     * of the history item and where the menu should appear.
-     */
     onMenuButtonTap_: function(e) {
       this.fire('toggle-menu', {
         target: Polymer.dom(e).localTarget,
         item: this.item,
-        path: this.path,
+        path: this.path
       });
-
-      // Stops the 'tap' event from closing the menu when it opens.
       e.stopPropagation();
     },
-
-    /**
-     * Set the favicon image, based on the URL of the history item.
-     * @private
-     */
     showIcon_: function() {
-      this.$.icon.style.backgroundImage =
-          cr.icon.getFaviconImageSet(this.item.url);
-    },
-
+      this.$.icon.style.backgroundImage = cr.icon.getFaviconImageSet(this.item.url);
+    },
     selectionNotAllowed_: function() {
       return !loadTimeData.getBoolean('allowDeletingHistory');
     },
-
-    /**
-     * Generates the title for this history card.
-     * @param {number} numberOfItems The number of items in the card.
-     * @param {string} search The search term associated with these results.
-     * @private
-     */
     cardTitle_: function(numberOfItems, historyDate, search) {
-      if (!search)
-        return this.item.dateRelativeDay;
-
+      if (!search) return this.item.dateRelativeDay;
       var resultId = numberOfItems == 1 ? 'searchResult' : 'searchResults';
-      return loadTimeData.getStringF('foundSearchResults', numberOfItems,
-          loadTimeData.getString(resultId), search);
-    },
-
-    /**
-     * Crop long item titles to reduce their effect on layout performance. See
-     * crbug.com/621347.
-     * @param {string} title
-     * @return {string}
-     */
+      return loadTimeData.getStringF('foundSearchResults', numberOfItems, loadTimeData.getString(resultId), search);
+    },
     cropItemTitle_: function(title) {
-      return (title.length > TITLE_MAX_LENGTH) ?
-          title.substr(0, TITLE_MAX_LENGTH) :
-          title;
+      return title.length > TITLE_MAX_LENGTH ? title.substr(0, TITLE_MAX_LENGTH) : title;
     }
   });
-
-  /**
-   * Check whether the time difference between the given history item and the
-   * next one is large enough for a spacer to be required.
-   * @param {Array<HistoryEntry>} visits
-   * @param {number} currentIndex
-   * @param {string} searchedTerm
-   * @return {boolean} Whether or not time gap separator is required.
-   * @private
-   */
   HistoryItem.needsTimeGap = function(visits, currentIndex, searchedTerm) {
-    if (currentIndex >= visits.length - 1 || visits.length == 0)
-      return false;
-
+    if (currentIndex >= visits.length - 1 || visits.length == 0) return false;
     var currentItem = visits[currentIndex];
     var nextItem = visits[currentIndex + 1];
-
-    if (searchedTerm)
-      return currentItem.dateShort != nextItem.dateShort;
-
-    return currentItem.time - nextItem.time > BROWSING_GAP_TIME &&
-        currentItem.dateRelativeDay == nextItem.dateRelativeDay;
+    if (searchedTerm) return currentItem.dateShort != nextItem.dateShort;
+    return currentItem.time - nextItem.time > BROWSING_GAP_TIME && currentItem.dateRelativeDay == nextItem.dateRelativeDay;
   };
-
-  return { HistoryItem: HistoryItem };
-});
+  return {
+    HistoryItem: HistoryItem
+  };
+});
+
 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
-/**
- * @constructor
- * @param {string} currentPath
- */
 var SelectionTreeNode = function(currentPath) {
-  /** @type {string} */
   this.currentPath = currentPath;
-  /** @type {boolean} */
   this.leaf = false;
-  /** @type {Array<number>} */
   this.indexes = [];
-  /** @type {Array<SelectionTreeNode>} */
   this.children = [];
 };
 
-/**
- * @param {number} index
- * @param {string} path
- */
 SelectionTreeNode.prototype.addChild = function(index, path) {
   this.indexes.push(index);
   this.children[index] = new SelectionTreeNode(path);
 };
 
-/** @polymerBehavior */
 var HistoryListBehavior = {
   properties: {
-    /**
-     * Polymer paths to the history items contained in this list.
-     * @type {!Set<string>} selectedPaths
-     */
     selectedPaths: {
       type: Object,
-      value: /** @return {!Set<string>} */ function() { return new Set(); }
-    },
-
-    lastSelectedPath: String,
-  },
-
+      value: function() {
+        return new Set();
+      }
+    },
+    lastSelectedPath: String
+  },
   listeners: {
-    'history-checkbox-select': 'itemSelected_',
-  },
-
-  /**
-   * @param {number} historyDataLength
-   * @return {boolean}
-   * @private
-   */
-  hasResults: function(historyDataLength) { return historyDataLength > 0; },
-
-  /**
-   * @param {string} searchedTerm
-   * @param {boolean} isLoading
-   * @return {string}
-   * @private
-   */
+    'history-checkbox-select': 'itemSelected_'
+  },
+  hasResults: function(historyDataLength) {
+    return historyDataLength > 0;
+  },
   noResultsMessage: function(searchedTerm, isLoading) {
-    if (isLoading)
-      return '';
-
+    if (isLoading) return '';
     var messageId = searchedTerm !== '' ? 'noSearchResults' : 'noResults';
     return loadTimeData.getString(messageId);
   },
-
-  /**
-   * Deselect each item in |selectedPaths|.
-   */
   unselectAllItems: function() {
     this.selectedPaths.forEach(function(path) {
       this.set(path + '.selected', false);
     }.bind(this));
-
     this.selectedPaths.clear();
   },
-
-  /**
-   * Performs a request to the backend to delete all selected items. If
-   * successful, removes them from the view. Does not prompt the user before
-   * deleting -- see <history-list-container> for a version of this method which
-   * does prompt.
-   */
   deleteSelected: function() {
-    var toBeRemoved =
-        Array.from(this.selectedPaths.values()).map(function(path) {
-          return this.get(path);
-        }.bind(this));
-
-    md_history.BrowserService.getInstance()
-        .deleteItems(toBeRemoved)
-        .then(function() {
-          this.removeItemsByPath(Array.from(this.selectedPaths));
-          this.fire('unselect-all');
-        }.bind(this));
-  },
-
-  /**
-   * Removes the history items in |paths|. Assumes paths are of a.0.b.0...
-   * structure.
-   *
-   * We want to use notifySplices to update the arrays for performance reasons
-   * which requires manually batching and sending the notifySplices for each
-   * level. To do this, we build a tree where each node is an array and then
-   * depth traverse it to remove items. Each time a node has all children
-   * deleted, we can also remove the node.
-   *
-   * @param {Array<string>} paths
-   * @private
-   */
+    var toBeRemoved = Array.from(this.selectedPaths.values()).map(function(path) {
+      return this.get(path);
+    }.bind(this));
+    md_history.BrowserService.getInstance().deleteItems(toBeRemoved).then(function() {
+      this.removeItemsByPath(Array.from(this.selectedPaths));
+      this.fire('unselect-all');
+    }.bind(this));
+  },
   removeItemsByPath: function(paths) {
-    if (paths.length == 0)
-      return;
-
+    if (paths.length == 0) return;
     this.removeItemsBeneathNode_(this.buildRemovalTree_(paths));
   },
-
-  /**
-   * Creates the tree to traverse in order to remove |paths| from this list.
-   * Assumes paths are of a.0.b.0...
-   * structure.
-   *
-   * @param {Array<string>} paths
-   * @return {SelectionTreeNode}
-   * @private
-   */
   buildRemovalTree_: function(paths) {
     var rootNode = new SelectionTreeNode(paths[0].split('.')[0]);
-
-    // Build a tree to each history item specified in |paths|.
     paths.forEach(function(path) {
       var components = path.split('.');
       var node = rootNode;
       components.shift();
       while (components.length > 1) {
         var index = Number(components.shift());
         var arrayName = components.shift();
-
-        if (!node.children[index])
-          node.addChild(index, [node.currentPath, index, arrayName].join('.'));
-
+        if (!node.children[index]) node.addChild(index, [ node.currentPath, index, arrayName ].join('.'));
         node = node.children[index];
       }
       node.leaf = true;
       node.indexes.push(Number(components.shift()));
     });
-
     return rootNode;
   },
-
-  /**
-   * Removes the history items underneath |node| and deletes container arrays as
-   * they become empty.
-   * @param {SelectionTreeNode} node
-   * @return {boolean} Whether this node's array should be deleted.
-   * @private
-   */
   removeItemsBeneathNode_: function(node) {
     var array = this.get(node.currentPath);
     var splices = [];
-
-    node.indexes.sort(function(a, b) { return b - a; });
+    node.indexes.sort(function(a, b) {
+      return b - a;
+    });
     node.indexes.forEach(function(index) {
       if (node.leaf || this.removeItemsBeneathNode_(node.children[index])) {
         var item = array.splice(index, 1);
         splices.push({
           index: index,
-          removed: [item],
+          removed: [ item ],
           addedCount: 0,
           object: array,
           type: 'splice'
         });
       }
     }.bind(this));
-
-    if (array.length == 0)
-      return true;
-
-    // notifySplices gives better performance than individually splicing as it
-    // batches all of the updates together.
+    if (array.length == 0) return true;
     this.notifySplices(node.currentPath, splices);
     return false;
   },
-
-  /**
-   * @param {Event} e
-   * @private
-   */
   itemSelected_: function(e) {
     var item = e.detail.element;
     var paths = [];
     var itemPath = item.path;
-
-    // Handle shift selection. Change the selection state of all items between
-    // |path| and |lastSelected| to the selection state of |item|.
     if (e.detail.shiftKey && this.lastSelectedPath) {
       var itemPathComponents = itemPath.split('.');
       var itemIndex = Number(itemPathComponents.pop());
       var itemArrayPath = itemPathComponents.join('.');
-
       var lastItemPathComponents = this.lastSelectedPath.split('.');
       var lastItemIndex = Number(lastItemPathComponents.pop());
       if (itemArrayPath == lastItemPathComponents.join('.')) {
-        for (var i = Math.min(itemIndex, lastItemIndex);
-             i <= Math.max(itemIndex, lastItemIndex); i++) {
+        for (var i = Math.min(itemIndex, lastItemIndex); i <= Math.max(itemIndex, lastItemIndex); i++) {
           paths.push(itemArrayPath + '.' + i);
         }
       }
     }
-
-    if (paths.length == 0)
-      paths.push(item.path);
-
+    if (paths.length == 0) paths.push(item.path);
     paths.forEach(function(path) {
       this.set(path + '.selected', item.selected);
-
       if (item.selected) {
         this.selectedPaths.add(path);
         return;
       }
-
       this.selectedPaths.delete(path);
     }.bind(this));
+    this.lastSelectedPath = itemPath;
+  }
+};
 
-    this.lastSelectedPath = itemPath;
-  },
-};
 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
-/**
- * @typedef {{domain: string,
- *            visits: !Array<HistoryEntry>,
- *            rendered: boolean,
- *            expanded: boolean}}
- */
 var HistoryDomain;
 
-/**
- * @typedef {{title: string,
- *            domains: !Array<HistoryDomain>}}
- */
 var HistoryGroup;
 
 Polymer({
   is: 'history-grouped-list',
-
-  behaviors: [HistoryListBehavior],
-
+  behaviors: [ HistoryListBehavior ],
   properties: {
-    // An array of history entries in reverse chronological order.
     historyData: {
-      type: Array,
+      type: Array
     },
-
-    /**
-     * @type {Array<HistoryGroup>}
-     */
     groupedHistoryData_: {
-      type: Array,
+      type: Array
     },
-
     searchedTerm: {
       type: String,
       value: ''
     },
-
     range: {
-      type: Number,
+      type: Number
     },
-
     queryStartTime: String,
-    queryEndTime: String,
+    queryEndTime: String
   },
-
-  observers: [
-    'updateGroupedHistoryData_(range, historyData)'
-  ],
-
-  /**
-   * Make a list of domains from visits.
-   * @param {!Array<!HistoryEntry>} visits
-   * @return {!Array<!HistoryDomain>}
-   */
+  observers: [ 'updateGroupedHistoryData_(range, historyData)' ],
   createHistoryDomains_: function(visits) {
     var domainIndexes = {};
     var domains = [];
-
-    // Group the visits into a dictionary and generate a list of domains.
     for (var i = 0, visit; visit = visits[i]; i++) {
       var domain = visit.domain;
       if (domainIndexes[domain] == undefined) {
         domainIndexes[domain] = domains.length;
         domains.push({
           domain: domain,
           visits: [],
           expanded: false,
-          rendered: false,
+          rendered: false
         });
       }
       domains[domainIndexes[domain]].visits.push(visit);
     }
     var sortByVisits = function(a, b) {
       return b.visits.length - a.visits.length;
     };
     domains.sort(sortByVisits);
-
     return domains;
   },
-
   updateGroupedHistoryData_: function() {
     if (this.historyData.length == 0) {
       this.groupedHistoryData_ = [];
       return;
     }
-
     if (this.range == HistoryRange.WEEK) {
-      // Group each day into a list of results.
       var days = [];
-      var currentDayVisits = [this.historyData[0]];
-
+      var currentDayVisits = [ this.historyData[0] ];
       var pushCurrentDay = function() {
         days.push({
-          title: this.searchedTerm ? currentDayVisits[0].dateShort :
-              currentDayVisits[0].dateRelativeDay,
-          domains: this.createHistoryDomains_(currentDayVisits),
+          title: this.searchedTerm ? currentDayVisits[0].dateShort : currentDayVisits[0].dateRelativeDay,
+          domains: this.createHistoryDomains_(currentDayVisits)
         });
       }.bind(this);
-
       var visitsSameDay = function(a, b) {
-        if (this.searchedTerm)
-          return a.dateShort == b.dateShort;
-
+        if (this.searchedTerm) return a.dateShort == b.dateShort;
         return a.dateRelativeDay == b.dateRelativeDay;
       }.bind(this);
-
       for (var i = 1; i < this.historyData.length; i++) {
         var visit = this.historyData[i];
         if (!visitsSameDay(visit, currentDayVisits[0])) {
           pushCurrentDay();
           currentDayVisits = [];
         }
         currentDayVisits.push(visit);
       }
       pushCurrentDay();
-
       this.groupedHistoryData_ = days;
     } else if (this.range == HistoryRange.MONTH) {
-      // Group each all visits into a single list.
-      this.groupedHistoryData_ = [{
+      this.groupedHistoryData_ = [ {
         title: this.queryStartTime + ' – ' + this.queryEndTime,
         domains: this.createHistoryDomains_(this.historyData)
-      }];
-    }
-  },
-
-  /**
-   * @param {{model:Object, currentTarget:IronCollapseElement}} e
-   */
+      } ];
+    }
+  },
   toggleDomainExpanded_: function(e) {
     var collapse = e.currentTarget.parentNode.querySelector('iron-collapse');
     e.model.set('domain.rendered', true);
-
-    // Give the history-items time to render.
-    setTimeout(function() { collapse.toggle() }, 0);
-  },
-
-  /**
-   * Check whether the time difference between the given history item and the
-   * next one is large enough for a spacer to be required.
-   * @param {number} groupIndex
-   * @param {number} domainIndex
-   * @param {number} itemIndex
-   * @return {boolean} Whether or not time gap separator is required.
-   * @private
-   */
+    setTimeout(function() {
+      collapse.toggle();
+    }, 0);
+  },
   needsTimeGap_: function(groupIndex, domainIndex, itemIndex) {
-    var visits =
-        this.groupedHistoryData_[groupIndex].domains[domainIndex].visits;
-
-    return md_history.HistoryItem.needsTimeGap(
-        visits, itemIndex, this.searchedTerm);
-  },
-
-  /**
-   * @param {number} groupIndex
-   * @param {number} domainIndex
-   * @param {number} itemIndex
-   * @return {string}
-   * @private
-   */
+    var visits = this.groupedHistoryData_[groupIndex].domains[domainIndex].visits;
+    return md_history.HistoryItem.needsTimeGap(visits, itemIndex, this.searchedTerm);
+  },
   pathForItem_: function(groupIndex, domainIndex, itemIndex) {
-    return [
-      'groupedHistoryData_', groupIndex, 'domains', domainIndex, 'visits',
-      itemIndex
-    ].join('.');
-  },
-
-  /**
-   * @param {HistoryDomain} domain
-   * @return {string}
-   * @private
-   */
+    return [ 'groupedHistoryData_', groupIndex, 'domains', domainIndex, 'visits', itemIndex ].join('.');
+  },
   getWebsiteIconStyle_: function(domain) {
-    return 'background-image: ' +
-        cr.icon.getFaviconImageSet(domain.visits[0].url);
-  },
-
-  /**
-   * @param {boolean} expanded
-   * @return {string}
-   * @private
-   */
+    return 'background-image: ' + cr.icon.getFaviconImageSet(domain.visits[0].url);
+  },
   getDropdownIcon_: function(expanded) {
     return expanded ? 'cr:expand-less' : 'cr:expand-more';
-  },
+  }
 });
-/**
-   * `Polymer.IronScrollTargetBehavior` allows an element to respond to scroll events from a
-   * designated scroll target.
-   *
-   * Elements that consume this behavior can override the `_scrollHandler`
-   * method to add logic on the scroll event.
-   *
-   * @demo demo/scrolling-region.html Scrolling Region
-   * @demo demo/document.html Document Element
-   * @polymerBehavior
-   */
-  Polymer.IronScrollTargetBehavior = {
 
-    properties: {
+Polymer.IronScrollTargetBehavior = {
+  properties: {
+    scrollTarget: {
+      type: HTMLElement,
+      value: function() {
+        return this._defaultScrollTarget;
+      }
+    }
+  },
+  observers: [ '_scrollTargetChanged(scrollTarget, isAttached)' ],
+  _scrollTargetChanged: function(scrollTarget, isAttached) {
+    var eventTarget;
+    if (this._oldScrollTarget) {
+      eventTarget = this._oldScrollTarget === this._doc ? window : this._oldScrollTarget;
+      eventTarget.removeEventListener('scroll', this._boundScrollHandler);
+      this._oldScrollTarget = null;
+    }
+    if (!isAttached) {
+      return;
+    }
+    if (scrollTarget === 'document') {
+      this.scrollTarget = this._doc;
+    } else if (typeof scrollTarget === 'string') {
+      this.scrollTarget = this.domHost ? this.domHost.$[scrollTarget] : Polymer.dom(this.ownerDocument).querySelector('#' + scrollTarget);
+    } else if (this._isValidScrollTarget()) {
+      eventTarget = scrollTarget === this._doc ? window : scrollTarget;
+      this._boundScrollHandler = this._boundScrollHandler || this._scrollHandler.bind(this);
+      this._oldScrollTarget = scrollTarget;
+      eventTarget.addEventListener('scroll', this._boundScrollHandler);
+    }
+  },
+  _scrollHandler: function scrollHandler() {},
+  get _defaultScrollTarget() {
+    return this._doc;
+  },
+  get _doc() {
+    return this.ownerDocument.documentElement;
+  },
+  get _scrollTop() {
+    if (this._isValidScrollTarget()) {
+      return this.scrollTarget === this._doc ? window.pageYOffset : this.scrollTarget.scrollTop;
+    }
+    return 0;
+  },
+  get _scrollLeft() {
+    if (this._isValidScrollTarget()) {
+      return this.scrollTarget === this._doc ? window.pageXOffset : this.scrollTarget.scrollLeft;
+    }
+    return 0;
+  },
+  set _scrollTop(top) {
+    if (this.scrollTarget === this._doc) {
+      window.scrollTo(window.pageXOffset, top);
+    } else if (this._isValidScrollTarget()) {
+      this.scrollTarget.scrollTop = top;
+    }
+  },
+  set _scrollLeft(left) {
+    if (this.scrollTarget === this._doc) {
+      window.scrollTo(left, window.pageYOffset);
+    } else if (this._isValidScrollTarget()) {
+      this.scrollTarget.scrollLeft = left;
+    }
+  },
+  scroll: function(left, top) {
+    if (this.scrollTarget === this._doc) {
+      window.scrollTo(left, top);
+    } else if (this._isValidScrollTarget()) {
+      this.scrollTarget.scrollLeft = left;
+      this.scrollTarget.scrollTop = top;
+    }
+  },
+  get _scrollTargetWidth() {
+    if (this._isValidScrollTarget()) {
+      return this.scrollTarget === this._doc ? window.innerWidth : this.scrollTarget.offsetWidth;
+    }
+    return 0;
+  },
+  get _scrollTargetHeight() {
+    if (this._isValidScrollTarget()) {
+      return this.scrollTarget === this._doc ? window.innerHeight : this.scrollTarget.offsetHeight;
+    }
+    return 0;
+  },
+  _isValidScrollTarget: function() {
+    return this.scrollTarget instanceof HTMLElement;
+  }
+};
 
-      /**
-       * Specifies the element that will handle the scroll event
-       * on the behalf of the current element. This is typically a reference to an element,
-       * but there are a few more posibilities:
-       *
-       * ### Elements id
-       *
-       *```html
-       * <div id="scrollable-element" style="overflow: auto;">
-       *  <x-element scroll-target="scrollable-element">
-       *    \x3c!-- Content--\x3e
-       *  </x-element>
-       * </div>
-       *```
-       * In this case, the `scrollTarget` will point to the outer div element.
-       *
-       * ### Document scrolling
-       *
-       * For document scrolling, you can use the reserved word `document`:
-       *
-       *```html
-       * <x-element scroll-target="document">
-       *   \x3c!-- Content --\x3e
-       * </x-element>
-       *```
-       *
-       * ### Elements reference
-       *
-       *```js
-       * appHeader.scrollTarget = document.querySelector('#scrollable-element');
-       *```
-       *
-       * @type {HTMLElement}
-       */
-      scrollTarget: {
-        type: HTMLElement,
-        value: function() {
-          return this._defaultScrollTarget;
-        }
-      }
-    },
-
-    observers: [
-      '_scrollTargetChanged(scrollTarget, isAttached)'
-    ],
-
-    _scrollTargetChanged: function(scrollTarget, isAttached) {
-      var eventTarget;
-
-      if (this._oldScrollTarget) {
-        eventTarget = this._oldScrollTarget === this._doc ? window : this._oldScrollTarget;
-        eventTarget.removeEventListener('scroll', this._boundScrollHandler);
-        this._oldScrollTarget = null;
-      }
-
-      if (!isAttached) {
-        return;
-      }
-      // Support element id references
-      if (scrollTarget === 'document') {
-
-        this.scrollTarget = this._doc;
-
-      } else if (typeof scrollTarget === 'string') {
-
-        this.scrollTarget = this.domHost ? this.domHost.$[scrollTarget] :
-            Polymer.dom(this.ownerDocument).querySelector('#' + scrollTarget);
-
-      } else if (this._isValidScrollTarget()) {
-
-        eventTarget = scrollTarget === this._doc ? window : scrollTarget;
-        this._boundScrollHandler = this._boundScrollHandler || this._scrollHandler.bind(this);
-        this._oldScrollTarget = scrollTarget;
-
-        eventTarget.addEventListener('scroll', this._boundScrollHandler);
-      }
-    },
-
-    /**
-     * Runs on every scroll event. Consumer of this behavior may override this method.
-     *
-     * @protected
-     */
-    _scrollHandler: function scrollHandler() {},
-
-    /**
-     * The default scroll target. Consumers of this behavior may want to customize
-     * the default scroll target.
-     *
-     * @type {Element}
-     */
-    get _defaultScrollTarget() {
-      return this._doc;
-    },
-
-    /**
-     * Shortcut for the document element
-     *
-     * @type {Element}
-     */
-    get _doc() {
-      return this.ownerDocument.documentElement;
-    },
-
-    /**
-     * Gets the number of pixels that the content of an element is scrolled upward.
-     *
-     * @type {number}
-     */
-    get _scrollTop() {
-      if (this._isValidScrollTarget()) {
-        return this.scrollTarget === this._doc ? window.pageYOffset : this.scrollTarget.scrollTop;
-      }
-      return 0;
-    },
-
-    /**
-     * Gets the number of pixels that the content of an element is scrolled to the left.
-     *
-     * @type {number}
-     */
-    get _scrollLeft() {
-      if (this._isValidScrollTarget()) {
-        return this.scrollTarget === this._doc ? window.pageXOffset : this.scrollTarget.scrollLeft;
-      }
-      return 0;
-    },
-
-    /**
-     * Sets the number of pixels that the content of an element is scrolled upward.
-     *
-     * @type {number}
-     */
-    set _scrollTop(top) {
-      if (this.scrollTarget === this._doc) {
-        window.scrollTo(window.pageXOffset, top);
-      } else if (this._isValidScrollTarget()) {
-        this.scrollTarget.scrollTop = top;
-      }
-    },
-
-    /**
-     * Sets the number of pixels that the content of an element is scrolled to the left.
-     *
-     * @type {number}
-     */
-    set _scrollLeft(left) {
-      if (this.scrollTarget === this._doc) {
-        window.scrollTo(left, window.pageYOffset);
-      } else if (this._isValidScrollTarget()) {
-        this.scrollTarget.scrollLeft = left;
-      }
-    },
-
-    /**
-     * Scrolls the content to a particular place.
-     *
-     * @method scroll
-     * @param {number} left The left position
-     * @param {number} top The top position
-     */
-    scroll: function(left, top) {
-       if (this.scrollTarget === this._doc) {
-        window.scrollTo(left, top);
-      } else if (this._isValidScrollTarget()) {
-        this.scrollTarget.scrollLeft = left;
-        this.scrollTarget.scrollTop = top;
-      }
-    },
-
-    /**
-     * Gets the width of the scroll target.
-     *
-     * @type {number}
-     */
-    get _scrollTargetWidth() {
-      if (this._isValidScrollTarget()) {
-        return this.scrollTarget === this._doc ? window.innerWidth : this.scrollTarget.offsetWidth;
-      }
-      return 0;
-    },
-
-    /**
-     * Gets the height of the scroll target.
-     *
-     * @type {number}
-     */
-    get _scrollTargetHeight() {
-      if (this._isValidScrollTarget()) {
-        return this.scrollTarget === this._doc ? window.innerHeight : this.scrollTarget.offsetHeight;
-      }
-      return 0;
-    },
-
-    /**
-     * Returns true if the scroll target is a valid HTMLElement.
-     *
-     * @return {boolean}
-     */
-    _isValidScrollTarget: function() {
-      return this.scrollTarget instanceof HTMLElement;
-    }
-  };
 (function() {
-
   var IOS = navigator.userAgent.match(/iP(?:hone|ad;(?: U;)? CPU) OS (\d+)/);
   var IOS_TOUCH_SCROLLING = IOS && IOS[1] >= 8;
   var DEFAULT_PHYSICAL_COUNT = 3;
   var HIDDEN_Y = '-10000px';
   var DEFAULT_GRID_SIZE = 200;
   var SECRET_TABINDEX = -100;
-
   Polymer({
-
     is: 'iron-list',
-
     properties: {
-
-      /**
-       * An array containing items determining how many instances of the template
-       * to stamp and that that each template instance should bind to.
-       */
       items: {
         type: Array
       },
-
-      /**
-       * The max count of physical items the pool can extend to.
-       */
       maxPhysicalCount: {
         type: Number,
         value: 500
       },
-
-      /**
-       * The name of the variable to add to the binding scope for the array
-       * element associated with a given template instance.
-       */
       as: {
         type: String,
         value: 'item'
       },
-
-      /**
-       * The name of the variable to add to the binding scope with the index
-       * for the row.
-       */
       indexAs: {
         type: String,
         value: 'index'
       },
-
-      /**
-       * The name of the variable to add to the binding scope to indicate
-       * if the row is selected.
-       */
       selectedAs: {
         type: String,
         value: 'selected'
       },
-
-      /**
-       * When true, the list is rendered as a grid. Grid items must have
-       * fixed width and height set via CSS. e.g.
-       *
-       * ```html
-       * <iron-list grid>
-       *   <template>
-       *      <div style="width: 100px; height: 100px;"> 100x100 </div>
-       *   </template>
-       * </iron-list>
-       * ```
-       */
       grid: {
         type: Boolean,
         value: false,
         reflectToAttribute: true
       },
-
-      /**
-       * When true, tapping a row will select the item, placing its data model
-       * in the set of selected items retrievable via the selection property.
-       *
-       * Note that tapping focusable elements within the list item will not
-       * result in selection, since they are presumed to have their * own action.
-       */
       selectionEnabled: {
         type: Boolean,
         value: false
       },
-
-      /**
-       * When `multiSelection` is false, this is the currently selected item, or `null`
-       * if no item is selected.
-       */
       selectedItem: {
         type: Object,
         notify: true
       },
-
-      /**
-       * When `multiSelection` is true, this is an array that contains the selected items.
-       */
       selectedItems: {
         type: Object,
         notify: true
       },
-
-      /**
-       * When `true`, multiple items may be selected at once (in this case,
-       * `selected` is an array of currently selected items).  When `false`,
-       * only one item may be selected at a time.
-       */
       multiSelection: {
         type: Boolean,
         value: false
       }
     },
-
-    observers: [
-      '_itemsChanged(items.*)',
-      '_selectionEnabledChanged(selectionEnabled)',
-      '_multiSelectionChanged(multiSelection)',
-      '_setOverflow(scrollTarget)'
-    ],
-
-    behaviors: [
-      Polymer.Templatizer,
-      Polymer.IronResizableBehavior,
-      Polymer.IronA11yKeysBehavior,
-      Polymer.IronScrollTargetBehavior
-    ],
-
+    observers: [ '_itemsChanged(items.*)', '_selectionEnabledChanged(selectionEnabled)', '_multiSelectionChanged(multiSelection)', '_setOverflow(scrollTarget)' ],
+    behaviors: [ Polymer.Templatizer, Polymer.IronResizableBehavior, Polymer.IronA11yKeysBehavior, Polymer.IronScrollTargetBehavior ],
     keyBindings: {
-      'up': '_didMoveUp',
-      'down': '_didMoveDown',
-      'enter': '_didEnter'
-    },
-
-    /**
-     * The ratio of hidden tiles that should remain in the scroll direction.
-     * Recommended value ~0.5, so it will distribute tiles evely in both directions.
-     */
-    _ratio: 0.5,
-
-    /**
-     * The padding-top value for the list.
-     */
+      up: '_didMoveUp',
+      down: '_didMoveDown',
+      enter: '_didEnter'
+    },
+    _ratio: .5,
     _scrollerPaddingTop: 0,
-
-    /**
-     * This value is the same as `scrollTop`.
-     */
     _scrollPosition: 0,
-
-    /**
-     * The sum of the heights of all the tiles in the DOM.
-     */
     _physicalSize: 0,
-
-    /**
-     * The average `offsetHeight` of the tiles observed till now.
-     */
     _physicalAverage: 0,
-
-    /**
-     * The number of tiles which `offsetHeight` > 0 observed until now.
-     */
     _physicalAverageCount: 0,
-
-    /**
-     * The Y position of the item rendered in the `_physicalStart`
-     * tile relative to the scrolling list.
-     */
     _physicalTop: 0,
-
-    /**
-     * The number of items in the list.
-     */
     _virtualCount: 0,
-
-    /**
-     * A map between an item key and its physical item index
-     */
     _physicalIndexForKey: null,
-
-    /**
-     * The estimated scroll height based on `_physicalAverage`
-     */
     _estScrollHeight: 0,
-
-    /**
-     * The scroll height of the dom node
-     */
     _scrollHeight: 0,
-
-    /**
-     * The height of the list. This is referred as the viewport in the context of list.
-     */
     _viewportHeight: 0,
-
-    /**
-     * The width of the list. This is referred as the viewport in the context of list.
-     */
     _viewportWidth: 0,
-
-    /**
-     * An array of DOM nodes that are currently in the tree
-     * @type {?Array<!TemplatizerNode>}
-     */
     _physicalItems: null,
-
-    /**
-     * An array of heights for each item in `_physicalItems`
-     * @type {?Array<number>}
-     */
     _physicalSizes: null,
-
-    /**
-     * A cached value for the first visible index.
-     * See `firstVisibleIndex`
-     * @type {?number}
-     */
     _firstVisibleIndexVal: null,
-
-    /**
-     * A cached value for the last visible index.
-     * See `lastVisibleIndex`
-     * @type {?number}
-     */
     _lastVisibleIndexVal: null,
-
-    /**
-     * A Polymer collection for the items.
-     * @type {?Polymer.Collection}
-     */
     _collection: null,
-
-    /**
-     * True if the current item list was rendered for the first time
-     * after attached.
-     */
     _itemsRendered: false,
-
-    /**
-     * The page that is currently rendered.
-     */
     _lastPage: null,
-
-    /**
-     * The max number of pages to render. One page is equivalent to the height of the list.
-     */
     _maxPages: 3,
-
-    /**
-     * The currently focused physical item.
-     */
     _focusedItem: null,
-
-    /**
-     * The index of the `_focusedItem`.
-     */
     _focusedIndex: -1,
-
-    /**
-     * The the item that is focused if it is moved offscreen.
-     * @private {?TemplatizerNode}
-     */
     _offscreenFocusedItem: null,
-
-    /**
-     * The item that backfills the `_offscreenFocusedItem` in the physical items
-     * list when that item is moved offscreen.
-     */
     _focusBackfillItem: null,
-
-    /**
-     * The maximum items per row
-     */
     _itemsPerRow: 1,
-
-    /**
-     * The width of each grid item
-     */
     _itemWidth: 0,
-
-    /**
-     * The height of the row in grid layout.
-     */
     _rowHeight: 0,
-
-    /**
-     * The bottom of the physical content.
-     */
     get _physicalBottom() {
       return this._physicalTop + this._physicalSize;
     },
-
-    /**
-     * The bottom of the scroll.
-     */
     get _scrollBottom() {
       return this._scrollPosition + this._viewportHeight;
     },
-
-    /**
-     * The n-th item rendered in the last physical item.
-     */
     get _virtualEnd() {
       return this._virtualStart + this._physicalCount - 1;
     },
-
-    /**
-     * The height of the physical content that isn't on the screen.
-     */
     get _hiddenContentSize() {
       var size = this.grid ? this._physicalRows * this._rowHeight : this._physicalSize;
       return size - this._viewportHeight;
     },
-
-    /**
-     * The maximum scroll top value.
-     */
     get _maxScrollTop() {
       return this._estScrollHeight - this._viewportHeight + this._scrollerPaddingTop;
     },
-
-    /**
-     * The lowest n-th value for an item such that it can be rendered in `_physicalStart`.
-     */
     _minVirtualStart: 0,
-
-    /**
-     * The largest n-th value for an item such that it can be rendered in `_physicalStart`.
-     */
     get _maxVirtualStart() {
       return Math.max(0, this._virtualCount - this._physicalCount);
     },
-
-    /**
-     * The n-th item rendered in the `_physicalStart` tile.
-     */
     _virtualStartVal: 0,
-
     set _virtualStart(val) {
       this._virtualStartVal = Math.min(this._maxVirtualStart, Math.max(this._minVirtualStart, val));
     },
-
     get _virtualStart() {
       return this._virtualStartVal || 0;
     },
-
-    /**
-     * The k-th tile that is at the top of the scrolling list.
-     */
     _physicalStartVal: 0,
-
     set _physicalStart(val) {
       this._physicalStartVal = val % this._physicalCount;
       if (this._physicalStartVal < 0) {
         this._physicalStartVal = this._physicalCount + this._physicalStartVal;
       }
       this._physicalEnd = (this._physicalStart + this._physicalCount - 1) % this._physicalCount;
     },
-
     get _physicalStart() {
       return this._physicalStartVal || 0;
     },
-
-    /**
-     * The number of tiles in the DOM.
-     */
     _physicalCountVal: 0,
-
     set _physicalCount(val) {
       this._physicalCountVal = val;
       this._physicalEnd = (this._physicalStart + this._physicalCount - 1) % this._physicalCount;
     },
-
     get _physicalCount() {
       return this._physicalCountVal;
     },
-
-    /**
-     * The k-th tile that is at the bottom of the scrolling list.
-     */
     _physicalEnd: 0,
-
-    /**
-     * An optimal physical size such that we will have enough physical items
-     * to fill up the viewport and recycle when the user scrolls.
-     *
-     * This default value assumes that we will at least have the equivalent
-     * to a viewport of physical items above and below the user's viewport.
-     */
     get _optPhysicalSize() {
       if (this.grid) {
         return this._estRowsInView * this._rowHeight * this._maxPages;
       }
       return this._viewportHeight * this._maxPages;
     },
-
     get _optPhysicalCount() {
       return this._estRowsInView * this._itemsPerRow * this._maxPages;
     },
-
-   /**
-    * True if the current list is visible.
-    */
     get _isVisible() {
       return this.scrollTarget && Boolean(this.scrollTarget.offsetWidth || this.scrollTarget.offsetHeight);
     },
-
-    /**
-     * Gets the index of the first visible item in the viewport.
-     *
-     * @type {number}
-     */
     get firstVisibleIndex() {
       if (this._firstVisibleIndexVal === null) {
         var physicalOffset = Math.floor(this._physicalTop + this._scrollerPaddingTop);
-
-        this._firstVisibleIndexVal = this._iterateItems(
-          function(pidx, vidx) {
-            physicalOffset += this._getPhysicalSizeIncrement(pidx);
-
-            if (physicalOffset > this._scrollPosition) {
-              return this.grid ? vidx - (vidx % this._itemsPerRow) : vidx;
-            }
-            // Handle a partially rendered final row in grid mode
-            if (this.grid && this._virtualCount - 1 === vidx) {
-              return vidx - (vidx % this._itemsPerRow);
-            }
-          }) || 0;
+        this._firstVisibleIndexVal = this._iterateItems(function(pidx, vidx) {
+          physicalOffset += this._getPhysicalSizeIncrement(pidx);
+          if (physicalOffset > this._scrollPosition) {
+            return this.grid ? vidx - vidx % this._itemsPerRow : vidx;
+          }
+          if (this.grid && this._virtualCount - 1 === vidx) {
+            return vidx - vidx % this._itemsPerRow;
+          }
+        }) || 0;
       }
       return this._firstVisibleIndexVal;
     },
-
-    /**
-     * Gets the index of the last visible item in the viewport.
-     *
-     * @type {number}
-     */
     get lastVisibleIndex() {
       if (this._lastVisibleIndexVal === null) {
         if (this.grid) {
           var lastIndex = this.firstVisibleIndex + this._estRowsInView * this._itemsPerRow - 1;
           this._lastVisibleIndexVal = Math.min(this._virtualCount, lastIndex);
         } else {
           var physicalOffset = this._physicalTop;
           this._iterateItems(function(pidx, vidx) {
             if (physicalOffset < this._scrollBottom) {
               this._lastVisibleIndexVal = vidx;
             } else {
-              // Break _iterateItems
               return true;
             }
             physicalOffset += this._getPhysicalSizeIncrement(pidx);
           });
         }
       }
       return this._lastVisibleIndexVal;
     },
-
     get _defaultScrollTarget() {
       return this;
     },
     get _virtualRowCount() {
       return Math.ceil(this._virtualCount / this._itemsPerRow);
     },
-
     get _estRowsInView() {
       return Math.ceil(this._viewportHeight / this._rowHeight);
     },
-
     get _physicalRows() {
       return Math.ceil(this._physicalCount / this._itemsPerRow);
     },
-
     ready: function() {
       this.addEventListener('focus', this._didFocus.bind(this), true);
     },
-
     attached: function() {
       this.updateViewportBoundaries();
       this._render();
-      // `iron-resize` is fired when the list is attached if the event is added
-      // before attached causing unnecessary work.
       this.listen(this, 'iron-resize', '_resizeHandler');
     },
-
     detached: function() {
       this._itemsRendered = false;
       this.unlisten(this, 'iron-resize', '_resizeHandler');
     },
-
-    /**
-     * Set the overflow property if this element has its own scrolling region
-     */
     _setOverflow: function(scrollTarget) {
       this.style.webkitOverflowScrolling = scrollTarget === this ? 'touch' : '';
       this.style.overflow = scrollTarget === this ? 'auto' : '';
     },
-
-    /**
-     * Invoke this method if you dynamically update the viewport's
-     * size or CSS padding.
-     *
-     * @method updateViewportBoundaries
-     */
     updateViewportBoundaries: function() {
-      this._scrollerPaddingTop = this.scrollTarget === this ? 0 :
-          parseInt(window.getComputedStyle(this)['padding-top'], 10);
-
+      this._scrollerPaddingTop = this.scrollTarget === this ? 0 : parseInt(window.getComputedStyle(this)['padding-top'], 10);
       this._viewportHeight = this._scrollTargetHeight;
       if (this.grid) {
         this._updateGridMetrics();
       }
     },
-
-    /**
-     * Update the models, the position of the
-     * items in the viewport and recycle tiles as needed.
-     */
     _scrollHandler: function() {
-      // clamp the `scrollTop` value
       var scrollTop = Math.max(0, Math.min(this._maxScrollTop, this._scrollTop));
       var delta = scrollTop - this._scrollPosition;
       var tileHeight, tileTop, kth, recycledTileSet, scrollBottom, physicalBottom;
       var ratio = this._ratio;
       var recycledTiles = 0;
       var hiddenContentSize = this._hiddenContentSize;
       var currentRatio = ratio;
       var movingUp = [];
-
-      // track the last `scrollTop`
       this._scrollPosition = scrollTop;
-
-      // clear cached visible indexes
       this._firstVisibleIndexVal = null;
       this._lastVisibleIndexVal = null;
-
       scrollBottom = this._scrollBottom;
       physicalBottom = this._physicalBottom;
-
-      // random access
       if (Math.abs(delta) > this._physicalSize) {
         this._physicalTop += delta;
-        recycledTiles =  Math.round(delta / this._physicalAverage);
-      }
-      // scroll up
-      else if (delta < 0) {
+        recycledTiles = Math.round(delta / this._physicalAverage);
+      } else if (delta < 0) {
         var topSpace = scrollTop - this._physicalTop;
         var virtualStart = this._virtualStart;
-
         recycledTileSet = [];
-
         kth = this._physicalEnd;
         currentRatio = topSpace / hiddenContentSize;
-
-        // move tiles from bottom to top
-        while (
-            // approximate `currentRatio` to `ratio`
-            currentRatio < ratio &&
-            // recycle less physical items than the total
-            recycledTiles < this._physicalCount &&
-            // ensure that these recycled tiles are needed
-            virtualStart - recycledTiles > 0 &&
-            // ensure that the tile is not visible
-            physicalBottom - this._getPhysicalSizeIncrement(kth) > scrollBottom
-        ) {
-
+        while (currentRatio < ratio && recycledTiles < this._physicalCount && virtualStart - recycledTiles > 0 && physicalBottom - this._getPhysicalSizeIncrement(kth) > scrollBottom) {
           tileHeight = this._getPhysicalSizeIncrement(kth);
           currentRatio += tileHeight / hiddenContentSize;
           physicalBottom -= tileHeight;
           recycledTileSet.push(kth);
           recycledTiles++;
-          kth = (kth === 0) ? this._physicalCount - 1 : kth - 1;
+          kth = kth === 0 ? this._physicalCount - 1 : kth - 1;
         }
-
         movingUp = recycledTileSet;
         recycledTiles = -recycledTiles;
-      }
-      // scroll down
-      else if (delta > 0) {
+      } else if (delta > 0) {
         var bottomSpace = physicalBottom - scrollBottom;
         var virtualEnd = this._virtualEnd;
-        var lastVirtualItemIndex = this._virtualCount-1;
-
+        var lastVirtualItemIndex = this._virtualCount - 1;
         recycledTileSet = [];
-
         kth = this._physicalStart;
         currentRatio = bottomSpace / hiddenContentSize;
-
-        // move tiles from top to bottom
-        while (
-            // approximate `currentRatio` to `ratio`
-            currentRatio < ratio &&
-            // recycle less physical items than the total
-            recycledTiles < this._physicalCount &&
-            // ensure that these recycled tiles are needed
-            virtualEnd + recycledTiles < lastVirtualItemIndex &&
-            // ensure that the tile is not visible
-            this._physicalTop + this._getPhysicalSizeIncrement(kth) < scrollTop
-          ) {
-
+        while (currentRatio < ratio && recycledTiles < this._physicalCount && virtualEnd + recycledTiles < lastVirtualItemIndex && this._physicalTop + this._getPhysicalSizeIncrement(kth) < scrollTop) {
           tileHeight = this._getPhysicalSizeIncrement(kth);
           currentRatio += tileHeight / hiddenContentSize;
-
           this._physicalTop += tileHeight;
           recycledTileSet.push(kth);
           recycledTiles++;
           kth = (kth + 1) % this._physicalCount;
         }
       }
-
       if (recycledTiles === 0) {
-        // Try to increase the pool if the list's client height isn't filled up with physical items
         if (physicalBottom < scrollBottom || this._physicalTop > scrollTop) {
           this._increasePoolIfNeeded();
         }
       } else {
         this._virtualStart = this._virtualStart + recycledTiles;
         this._physicalStart = this._physicalStart + recycledTiles;
         this._update(recycledTileSet, movingUp);
       }
     },
-
-    /**
-     * Update the list of items, starting from the `_virtualStart` item.
-     * @param {!Array<number>=} itemSet
-     * @param {!Array<number>=} movingUp
-     */
     _update: function(itemSet, movingUp) {
-      // manage focus
       this._manageFocus();
-      // update models
       this._assignModels(itemSet);
-      // measure heights
       this._updateMetrics(itemSet);
-      // adjust offset after measuring
       if (movingUp) {
         while (movingUp.length) {
           var idx = movingUp.pop();
           this._physicalTop -= this._getPhysicalSizeIncrement(idx);
         }
       }
-      // update the position of the items
       this._positionItems();
-      // set the scroller size
       this._updateScrollerSize();
-      // increase the pool of physical items
       this._increasePoolIfNeeded();
     },
-
-    /**
-     * Creates a pool of DOM elements and attaches them to the local dom.
-     */
     _createPool: function(size) {
       var physicalItems = new Array(size);
-
       this._ensureTemplatized();
-
       for (var i = 0; i < size; i++) {
         var inst = this.stamp(null);
-        // First element child is item; Safari doesn't support children[0]
-        // on a doc fragment
         physicalItems[i] = inst.root.querySelector('*');
         Polymer.dom(this).appendChild(inst.root);
       }
       return physicalItems;
     },
-
-    /**
-     * Increases the pool of physical items only if needed.
-     *
-     * @return {boolean} True if the pool was increased.
-     */
     _increasePoolIfNeeded: function() {
-      // Base case 1: the list has no height.
       if (this._viewportHeight === 0) {
         return false;
       }
-      // Base case 2: If the physical size is optimal and the list's client height is full
-      // with physical items, don't increase the pool.
       var isClientHeightFull = this._physicalBottom >= this._scrollBottom && this._physicalTop <= this._scrollPosition;
       if (this._physicalSize >= this._optPhysicalSize && isClientHeightFull) {
         return false;
       }
-      // this value should range between [0 <= `currentPage` <= `_maxPages`]
       var currentPage = Math.floor(this._physicalSize / this._viewportHeight);
-
       if (currentPage === 0) {
-        // fill the first page
-        this._debounceTemplate(this._increasePool.bind(this, Math.round(this._physicalCount * 0.5)));
+        this._debounceTemplate(this._increasePool.bind(this, Math.round(this._physicalCount * .5)));
       } else if (this._lastPage !== currentPage && isClientHeightFull) {
-        // paint the page and defer the next increase
-        // wait 16ms which is rough enough to get paint cycle.
         Polymer.dom.addDebouncer(this.debounce('_debounceTemplate', this._increasePool.bind(this, this._itemsPerRow), 16));
       } else {
-        // fill the rest of the pages
         this._debounceTemplate(this._increasePool.bind(this, this._itemsPerRow));
       }
-
       this._lastPage = currentPage;
-
       return true;
     },
-
-    /**
-     * Increases the pool size.
-     */
     _increasePool: function(missingItems) {
-      var nextPhysicalCount = Math.min(
-          this._physicalCount + missingItems,
-          this._virtualCount - this._virtualStart,
-          Math.max(this.maxPhysicalCount, DEFAULT_PHYSICAL_COUNT)
-        );
+      var nextPhysicalCount = Math.min(this._physicalCount + missingItems, this._virtualCount - this._virtualStart, Math.max(this.maxPhysicalCount, DEFAULT_PHYSICAL_COUNT));
       var prevPhysicalCount = this._physicalCount;
       var delta = nextPhysicalCount - prevPhysicalCount;
-
       if (delta <= 0) {
         return;
       }
-
       [].push.apply(this._physicalItems, this._createPool(delta));
       [].push.apply(this._physicalSizes, new Array(delta));
-
       this._physicalCount = prevPhysicalCount + delta;
-
-      // update the physical start if we need to preserve the model of the focused item.
-      // In this situation, the focused item is currently rendered and its model would
-      // have changed after increasing the pool if the physical start remained unchanged.
-      if (this._physicalStart > this._physicalEnd &&
-          this._isIndexRendered(this._focusedIndex) &&
-          this._getPhysicalIndex(this._focusedIndex) < this._physicalEnd) {
+      if (this._physicalStart > this._physicalEnd && this._isIndexRendered(this._focusedIndex) && this._getPhysicalIndex(this._focusedIndex) < this._physicalEnd) {
         this._physicalStart = this._physicalStart + delta;
       }
       this._update();
     },
-
-    /**
-     * Render a new list of items. This method does exactly the same as `update`,
-     * but it also ensures that only one `update` cycle is created.
-     */
     _render: function() {
       var requiresUpdate = this._virtualCount > 0 || this._physicalCount > 0;
-
       if (this.isAttached && !this._itemsRendered && this._isVisible && requiresUpdate) {
         this._lastPage = 0;
         this._update();
         this._itemsRendered = true;
       }
     },
-
-    /**
-     * Templetizes the user template.
-     */
     _ensureTemplatized: function() {
       if (!this.ctor) {
-        // Template instance props that should be excluded from forwarding
         var props = {};
         props.__key__ = true;
         props[this.as] = true;
         props[this.indexAs] = true;
         props[this.selectedAs] = true;
         props.tabIndex = true;
-
         this._instanceProps = props;
         this._userTemplate = Polymer.dom(this).querySelector('template');
-
         if (this._userTemplate) {
           this.templatize(this._userTemplate);
         } else {
           console.warn('iron-list requires a template to be provided in light-dom');
         }
       }
     },
-
-    /**
-     * Implements extension point from Templatizer mixin.
-     */
     _getStampedChildren: function() {
       return this._physicalItems;
     },
-
-    /**
-     * Implements extension point from Templatizer
-     * Called as a side effect of a template instance path change, responsible
-     * for notifying items.<key-for-instance>.<path> change up to host.
-     */
     _forwardInstancePath: function(inst, path, value) {
       if (path.indexOf(this.as + '.') === 0) {
-        this.notifyPath('items.' + inst.__key__ + '.' +
-          path.slice(this.as.length + 1), value);
+        this.notifyPath('items.' + inst.__key__ + '.' + path.slice(this.as.length + 1), value);
       }
     },
-
-    /**
-     * Implements extension point from Templatizer mixin
-     * Called as side-effect of a host property change, responsible for
-     * notifying parent path change on each row.
-     */
     _forwardParentProp: function(prop, value) {
       if (this._physicalItems) {
         this._physicalItems.forEach(function(item) {
           item._templateInstance[prop] = value;
         }, this);
       }
     },
-
-    /**
-     * Implements extension point from Templatizer
-     * Called as side-effect of a host path change, responsible for
-     * notifying parent.<path> path change on each row.
-     */
     _forwardParentPath: function(path, value) {
       if (this._physicalItems) {
         this._physicalItems.forEach(function(item) {
           item._templateInstance.notifyPath(path, value, true);
         }, this);
       }
     },
-
-    /**
-     * Called as a side effect of a host items.<key>.<path> path change,
-     * responsible for notifying item.<path> changes.
-     */
     _forwardItemPath: function(path, value) {
       if (!this._physicalIndexForKey) {
         return;
       }
       var dot = path.indexOf('.');
       var key = path.substring(0, dot < 0 ? path.length : dot);
       var idx = this._physicalIndexForKey[key];
       var offscreenItem = this._offscreenFocusedItem;
-      var el = offscreenItem && offscreenItem._templateInstance.__key__ === key ?
-          offscreenItem : this._physicalItems[idx];
-
+      var el = offscreenItem && offscreenItem._templateInstance.__key__ === key ? offscreenItem : this._physicalItems[idx];
       if (!el || el._templateInstance.__key__ !== key) {
         return;
       }
       if (dot >= 0) {
-        path = this.as + '.' + path.substring(dot+1);
+        path = this.as + '.' + path.substring(dot + 1);
         el._templateInstance.notifyPath(path, value, true);
       } else {
-        // Update selection if needed
         var currentItem = el._templateInstance[this.as];
         if (Array.isArray(this.selectedItems)) {
           for (var i = 0; i < this.selectedItems.length; i++) {
             if (this.selectedItems[i] === currentItem) {
               this.set('selectedItems.' + i, value);
               break;
             }
           }
         } else if (this.selectedItem === currentItem) {
           this.set('selectedItem', value);
         }
         el._templateInstance[this.as] = value;
       }
     },
-
-    /**
-     * Called when the items have changed. That is, ressignments
-     * to `items`, splices or updates to a single item.
-     */
     _itemsChanged: function(change) {
       if (change.path === 'items') {
-        // reset items
         this._virtualStart = 0;
         this._physicalTop = 0;
         this._virtualCount = this.items ? this.items.length : 0;
         this._collection = this.items ? Polymer.Collection.get(this.items) : null;
         this._physicalIndexForKey = {};
         this._firstVisibleIndexVal = null;
         this._lastVisibleIndexVal = null;
-
         this._resetScrollPosition(0);
         this._removeFocusedItem();
-        // create the initial physical items
         if (!this._physicalItems) {
           this._physicalCount = Math.max(1, Math.min(DEFAULT_PHYSICAL_COUNT, this._virtualCount));
           this._physicalItems = this._createPool(this._physicalCount);
           this._physicalSizes = new Array(this._physicalCount);
         }
-
         this._physicalStart = 0;
-
       } else if (change.path === 'items.splices') {
-
         this._adjustVirtualIndex(change.value.indexSplices);
         this._virtualCount = this.items ? this.items.length : 0;
-
       } else {
-        // update a single item
         this._forwardItemPath(change.path.split('.').slice(1).join('.'), change.value);
         return;
       }
-
       this._itemsRendered = false;
       this._debounceTemplate(this._render);
     },
-
-    /**
-     * @param {!Array<!PolymerSplice>} splices
-     */
     _adjustVirtualIndex: function(splices) {
       splices.forEach(function(splice) {
-        // deselect removed items
         splice.removed.forEach(this._removeItem, this);
-        // We only need to care about changes happening above the current position
         if (splice.index < this._virtualStart) {
-          var delta = Math.max(
-              splice.addedCount - splice.removed.length,
-              splice.index - this._virtualStart);
-
+          var delta = Math.max(splice.addedCount - splice.removed.length, splice.index - this._virtualStart);
           this._virtualStart = this._virtualStart + delta;
-
           if (this._focusedIndex >= 0) {
             this._focusedIndex = this._focusedIndex + delta;
           }
         }
       }, this);
     },
-
     _removeItem: function(item) {
       this.$.selector.deselect(item);
-      // remove the current focused item
       if (this._focusedItem && this._focusedItem._templateInstance[this.as] === item) {
         this._removeFocusedItem();
       }
     },
-
-    /**
-     * Executes a provided function per every physical index in `itemSet`
-     * `itemSet` default value is equivalent to the entire set of physical indexes.
-     *
-     * @param {!function(number, number)} fn
-     * @param {!Array<number>=} itemSet
-     */
     _iterateItems: function(fn, itemSet) {
       var pidx, vidx, rtn, i;
-
       if (arguments.length === 2 && itemSet) {
         for (i = 0; i < itemSet.length; i++) {
           pidx = itemSet[i];
           vidx = this._computeVidx(pidx);
           if ((rtn = fn.call(this, pidx, vidx)) != null) {
             return rtn;
           }
         }
       } else {
         pidx = this._physicalStart;
         vidx = this._virtualStart;
-
-        for (; pidx < this._physicalCount; pidx++, vidx++) {
+        for (;pidx < this._physicalCount; pidx++, vidx++) {
           if ((rtn = fn.call(this, pidx, vidx)) != null) {
             return rtn;
           }
         }
         for (pidx = 0; pidx < this._physicalStart; pidx++, vidx++) {
           if ((rtn = fn.call(this, pidx, vidx)) != null) {
             return rtn;
           }
         }
       }
     },
-
-    /**
-     * Returns the virtual index for a given physical index
-     *
-     * @param {number} pidx Physical index
-     * @return {number}
-     */
     _computeVidx: function(pidx) {
       if (pidx >= this._physicalStart) {
         return this._virtualStart + (pidx - this._physicalStart);
       }
       return this._virtualStart + (this._physicalCount - this._physicalStart) + pidx;
     },
-
-    /**
-     * Assigns the data models to a given set of items.
-     * @param {!Array<number>=} itemSet
-     */
     _assignModels: function(itemSet) {
       this._iterateItems(function(pidx, vidx) {
         var el = this._physicalItems[pidx];
         var inst = el._templateInstance;
         var item = this.items && this.items[vidx];
-
         if (item != null) {
           inst[this.as] = item;
           inst.__key__ = this._collection.getKey(item);
-          inst[this.selectedAs] = /** @type {!ArraySelectorElement} */ (this.$.selector).isSelected(item);
+          inst[this.selectedAs] = this.$.selector.isSelected(item);
           inst[this.indexAs] = vidx;
           inst.tabIndex = this._focusedIndex === vidx ? 0 : -1;
           this._physicalIndexForKey[inst.__key__] = pidx;
           el.removeAttribute('hidden');
         } else {
           inst.__key__ = null;
           el.setAttribute('hidden', '');
         }
       }, itemSet);
     },
-
-    /**
-     * Updates the height for a given set of items.
-     *
-     * @param {!Array<number>=} itemSet
-     */
-     _updateMetrics: function(itemSet) {
-      // Make sure we distributed all the physical items
-      // so we can measure them
+    _updateMetrics: function(itemSet) {
       Polymer.dom.flush();
-
       var newPhysicalSize = 0;
       var oldPhysicalSize = 0;
       var prevAvgCount = this._physicalAverageCount;
       var prevPhysicalAvg = this._physicalAverage;
-
       this._iterateItems(function(pidx, vidx) {
-
         oldPhysicalSize += this._physicalSizes[pidx] || 0;
         this._physicalSizes[pidx] = this._physicalItems[pidx].offsetHeight;
         newPhysicalSize += this._physicalSizes[pidx];
         this._physicalAverageCount += this._physicalSizes[pidx] ? 1 : 0;
-
       }, itemSet);
-
       this._viewportHeight = this._scrollTargetHeight;
       if (this.grid) {
         this._updateGridMetrics();
         this._physicalSize = Math.ceil(this._physicalCount / this._itemsPerRow) * this._rowHeight;
       } else {
         this._physicalSize = this._physicalSize + newPhysicalSize - oldPhysicalSize;
       }
-
-      // update the average if we measured something
       if (this._physicalAverageCount !== prevAvgCount) {
-        this._physicalAverage = Math.round(
-            ((prevPhysicalAvg * prevAvgCount) + newPhysicalSize) /
-            this._physicalAverageCount);
+        this._physicalAverage = Math.round((prevPhysicalAvg * prevAvgCount + newPhysicalSize) / this._physicalAverageCount);
       }
     },
-
     _updateGridMetrics: function() {
       this._viewportWidth = this.$.items.offsetWidth;
-      // Set item width to the value of the _physicalItems offsetWidth
       this._itemWidth = this._physicalCount > 0 ? this._physicalItems[0].getBoundingClientRect().width : DEFAULT_GRID_SIZE;
-      // Set row height to the value of the _physicalItems offsetHeight
       this._rowHeight = this._physicalCount > 0 ? this._physicalItems[0].offsetHeight : DEFAULT_GRID_SIZE;
-      // If in grid mode compute how many items with exist in each row
       this._itemsPerRow = this._itemWidth ? Math.floor(this._viewportWidth / this._itemWidth) : this._itemsPerRow;
     },
-
-    /**
-     * Updates the position of the physical items.
-     */
     _positionItems: function() {
       this._adjustScrollPosition();
-
       var y = this._physicalTop;
-
       if (this.grid) {
         var totalItemWidth = this._itemsPerRow * this._itemWidth;
         var rowOffset = (this._viewportWidth - totalItemWidth) / 2;
-
         this._iterateItems(function(pidx, vidx) {
-
           var modulus = vidx % this._itemsPerRow;
-          var x = Math.floor((modulus * this._itemWidth) + rowOffset);
-
+          var x = Math.floor(modulus * this._itemWidth + rowOffset);
           this.translate3d(x + 'px', y + 'px', 0, this._physicalItems[pidx]);
-
           if (this._shouldRenderNextRow(vidx)) {
             y += this._rowHeight;
           }
-
         });
       } else {
         this._iterateItems(function(pidx, vidx) {
-
           this.translate3d(0, y + 'px', 0, this._physicalItems[pidx]);
           y += this._physicalSizes[pidx];
-
         });
       }
     },
-
     _getPhysicalSizeIncrement: function(pidx) {
       if (!this.grid) {
         return this._physicalSizes[pidx];
       }
       if (this._computeVidx(pidx) % this._itemsPerRow !== this._itemsPerRow - 1) {
         return 0;
       }
       return this._rowHeight;
     },
-
-    /**
-     * Returns, based on the current index,
-     * whether or not the next index will need
-     * to be rendered on a new row.
-     *
-     * @param {number} vidx Virtual index
-     * @return {boolean}
-     */
     _shouldRenderNextRow: function(vidx) {
       return vidx % this._itemsPerRow === this._itemsPerRow - 1;
     },
-
-    /**
-     * Adjusts the scroll position when it was overestimated.
-     */
     _adjustScrollPosition: function() {
-      var deltaHeight = this._virtualStart === 0 ? this._physicalTop :
-          Math.min(this._scrollPosition + this._physicalTop, 0);
-
+      var deltaHeight = this._virtualStart === 0 ? this._physicalTop : Math.min(this._scrollPosition + this._physicalTop, 0);
       if (deltaHeight) {
         this._physicalTop = this._physicalTop - deltaHeight;
-        // juking scroll position during interial scrolling on iOS is no bueno
         if (!IOS_TOUCH_SCROLLING && this._physicalTop !== 0) {
           this._resetScrollPosition(this._scrollTop - deltaHeight);
         }
       }
     },
-
-    /**
-     * Sets the position of the scroll.
-     */
     _resetScrollPosition: function(pos) {
       if (this.scrollTarget) {
         this._scrollTop = pos;
         this._scrollPosition = this._scrollTop;
       }
     },
-
-    /**
-     * Sets the scroll height, that's the height of the content,
-     *
-     * @param {boolean=} forceUpdate If true, updates the height no matter what.
-     */
     _updateScrollerSize: function(forceUpdate) {
       if (this.grid) {
         this._estScrollHeight = this._virtualRowCount * this._rowHeight;
       } else {
-        this._estScrollHeight = (this._physicalBottom +
-            Math.max(this._virtualCount - this._physicalCount - this._virtualStart, 0) * this._physicalAverage);
+        this._estScrollHeight = this._physicalBottom + Math.max(this._virtualCount - this._physicalCount - this._virtualStart, 0) * this._physicalAverage;
       }
-
       forceUpdate = forceUpdate || this._scrollHeight === 0;
       forceUpdate = forceUpdate || this._scrollPosition >= this._estScrollHeight - this._physicalSize;
       forceUpdate = forceUpdate || this.grid && this.$.items.style.height < this._estScrollHeight;
-
-      // amortize height adjustment, so it won't trigger repaints very often
       if (forceUpdate || Math.abs(this._estScrollHeight - this._scrollHeight) >= this._optPhysicalSize) {
         this.$.items.style.height = this._estScrollHeight + 'px';
         this._scrollHeight = this._estScrollHeight;
       }
     },
-
-    /**
-     * Scroll to a specific item in the virtual list regardless
-     * of the physical items in the DOM tree.
-     *
-     * @method scrollToItem
-     * @param {(Object)} item The item to be scrolled to
-     */
-    scrollToItem: function(item){
+    scrollToItem: function(item) {
       return this.scrollToIndex(this.items.indexOf(item));
     },
-
-    /**
-     * Scroll to a specific index in the virtual list regardless
-     * of the physical items in the DOM tree.
-     *
-     * @method scrollToIndex
-     * @param {number} idx The index of the item
-     */
     scrollToIndex: function(idx) {
       if (typeof idx !== 'number' || idx < 0 || idx > this.items.length - 1) {
         return;
       }
-
       Polymer.dom.flush();
-
-      idx = Math.min(Math.max(idx, 0), this._virtualCount-1);
-      // update the virtual start only when needed
+      idx = Math.min(Math.max(idx, 0), this._virtualCount - 1);
       if (!this._isIndexRendered(idx) || idx >= this._maxVirtualStart) {
-        this._virtualStart = this.grid ? (idx - this._itemsPerRow * 2) : (idx - 1);
+        this._virtualStart = this.grid ? idx - this._itemsPerRow * 2 : idx - 1;
       }
-      // manage focus
       this._manageFocus();
-      // assign new models
       this._assignModels();
-      // measure the new sizes
       this._updateMetrics();
-
-      // estimate new physical offset
-      var estPhysicalTop = Math.floor(this._virtualStart / this._itemsPerRow)  * this._physicalAverage;
+      var estPhysicalTop = Math.floor(this._virtualStart / this._itemsPerRow) * this._physicalAverage;
       this._physicalTop = estPhysicalTop;
-
       var currentTopItem = this._physicalStart;
       var currentVirtualItem = this._virtualStart;
       var targetOffsetTop = 0;
       var hiddenContentSize = this._hiddenContentSize;
-
-      // scroll to the item as much as we can
       while (currentVirtualItem < idx && targetOffsetTop <= hiddenContentSize) {
         targetOffsetTop = targetOffsetTop + this._getPhysicalSizeIncrement(currentTopItem);
         currentTopItem = (currentTopItem + 1) % this._physicalCount;
         currentVirtualItem++;
       }
-      // update the scroller size
       this._updateScrollerSize(true);
-      // update the position of the items
       this._positionItems();
-      // set the new scroll position
       this._resetScrollPosition(this._physicalTop + this._scrollerPaddingTop + targetOffsetTop);
-      // increase the pool of physical items if needed
       this._increasePoolIfNeeded();
-      // clear cached visible index
       this._firstVisibleIndexVal = null;
       this._lastVisibleIndexVal = null;
     },
-
-    /**
-     * Reset the physical average and the average count.
-     */
     _resetAverage: function() {
       this._physicalAverage = 0;
       this._physicalAverageCount = 0;
     },
-
-    /**
-     * A handler for the `iron-resize` event triggered by `IronResizableBehavior`
-     * when the element is resized.
-     */
     _resizeHandler: function() {
-      // iOS fires the resize event when the address bar slides up
       if (IOS && Math.abs(this._viewportHeight - this._scrollTargetHeight) < 100) {
         return;
       }
-      // In Desktop Safari 9.0.3, if the scroll bars are always shown,
-      // changing the scroll position from a resize handler would result in
-      // the scroll position being reset. Waiting 1ms fixes the issue.
       Polymer.dom.addDebouncer(this.debounce('_debounceTemplate', function() {
         this.updateViewportBoundaries();
         this._render();
-
         if (this._itemsRendered && this._physicalItems && this._isVisible) {
           this._resetAverage();
           this.scrollToIndex(this.firstVisibleIndex);
         }
       }.bind(this), 1));
     },
-
     _getModelFromItem: function(item) {
       var key = this._collection.getKey(item);
       var pidx = this._physicalIndexForKey[key];
-
       if (pidx != null) {
         return this._physicalItems[pidx]._templateInstance;
       }
       return null;
     },
-
-    /**
-     * Gets a valid item instance from its index or the object value.
-     *
-     * @param {(Object|number)} item The item object or its index
-     */
     _getNormalizedItem: function(item) {
       if (this._collection.getKey(item) === undefined) {
         if (typeof item === 'number') {
           item = this.items[item];
           if (!item) {
             throw new RangeError('<item> not found');
           }
           return item;
         }
         throw new TypeError('<item> should be a valid item');
       }
       return item;
     },
-
-    /**
-     * Select the list item at the given index.
-     *
-     * @method selectItem
-     * @param {(Object|number)} item The item object or its index
-     */
     selectItem: function(item) {
       item = this._getNormalizedItem(item);
       var model = this._getModelFromItem(item);
-
       if (!this.multiSelection && this.selectedItem) {
         this.deselectItem(this.selectedItem);
       }
       if (model) {
         model[this.selectedAs] = true;
       }
       this.$.selector.select(item);
       this.updateSizeForItem(item);
     },
-
-    /**
-     * Deselects the given item list if it is already selected.
-     *
-
-     * @method deselect
-     * @param {(Object|number)} item The item object or its index
-     */
     deselectItem: function(item) {
       item = this._getNormalizedItem(item);
       var model = this._getModelFromItem(item);
-
       if (model) {
         model[this.selectedAs] = false;
       }
       this.$.selector.deselect(item);
       this.updateSizeForItem(item);
     },
-
-    /**
-     * Select or deselect a given item depending on whether the item
-     * has already been selected.
-     *
-     * @method toggleSelectionForItem
-     * @param {(Object|number)} item The item object or its index
-     */
     toggleSelectionForItem: function(item) {
       item = this._getNormalizedItem(item);
-      if (/** @type {!ArraySelectorElement} */ (this.$.selector).isSelected(item)) {
+      if (this.$.selector.isSelected(item)) {
         this.deselectItem(item);
       } else {
         this.selectItem(item);
       }
     },
-
-    /**
-     * Clears the current selection state of the list.
-     *
-     * @method clearSelection
-     */
     clearSelection: function() {
       function unselect(item) {
         var model = this._getModelFromItem(item);
         if (model) {
           model[this.selectedAs] = false;
         }
       }
-
       if (Array.isArray(this.selectedItems)) {
         this.selectedItems.forEach(unselect, this);
       } else if (this.selectedItem) {
         unselect.call(this, this.selectedItem);
       }
-
-      /** @type {!ArraySelectorElement} */ (this.$.selector).clearSelection();
+      this.$.selector.clearSelection();
     },
-
-    /**
-     * Add an event listener to `tap` if `selectionEnabled` is true,
-     * it will remove the listener otherwise.
-     */
     _selectionEnabledChanged: function(selectionEnabled) {
       var handler = selectionEnabled ? this.listen : this.unlisten;
       handler.call(this, this, 'tap', '_selectionHandler');
     },
-
-    /**
-     * Select an item from an event object.
-     */
     _selectionHandler: function(e) {
       var model = this.modelForElement(e.target);
       if (!model) {
         return;
       }
       var modelTabIndex, activeElTabIndex;
       var target = Polymer.dom(e).path[0];
       var activeEl = Polymer.dom(this.domHost ? this.domHost.root : document).activeElement;
       var physicalItem = this._physicalItems[this._getPhysicalIndex(model[this.indexAs])];
-      // Safari does not focus certain form controls via mouse
-      // https://bugs.webkit.org/show_bug.cgi?id=118043
-      if (target.localName === 'input' ||
-          target.localName === 'button' ||
-          target.localName === 'select') {
+      if (target.localName === 'input' || target.localName === 'button' || target.localName === 'select') {
         return;
       }
-      // Set a temporary tabindex
       modelTabIndex = model.tabIndex;
       model.tabIndex = SECRET_TABINDEX;
       activeElTabIndex = activeEl ? activeEl.tabIndex : -1;
       model.tabIndex = modelTabIndex;
-      // Only select the item if the tap wasn't on a focusable child
-      // or the element bound to `tabIndex`
       if (activeEl && physicalItem.contains(activeEl) && activeElTabIndex !== SECRET_TABINDEX) {
         return;
       }
       this.toggleSelectionForItem(model[this.as]);
     },
-
     _multiSelectionChanged: function(multiSelection) {
       this.clearSelection();
       this.$.selector.multi = multiSelection;
     },
-
-    /**
-     * Updates the size of an item.
-     *
-     * @method updateSizeForItem
-     * @param {(Object|number)} item The item object or its index
-     */
     updateSizeForItem: function(item) {
       item = this._getNormalizedItem(item);
       var key = this._collection.getKey(item);
       var pidx = this._physicalIndexForKey[key];
-
       if (pidx != null) {
-        this._updateMetrics([pidx]);
+        this._updateMetrics([ pidx ]);
         this._positionItems();
       }
     },
-
-    /**
-     * Creates a temporary backfill item in the rendered pool of physical items
-     * to replace the main focused item. The focused item has tabIndex = 0
-     * and might be currently focused by the user.
-     *
-     * This dynamic replacement helps to preserve the focus state.
-     */
     _manageFocus: function() {
       var fidx = this._focusedIndex;
-
       if (fidx >= 0 && fidx < this._virtualCount) {
-        // if it's a valid index, check if that index is rendered
-        // in a physical item.
         if (this._isIndexRendered(fidx)) {
           this._restoreFocusedItem();
         } else {
           this._createFocusBackfillItem();
         }
       } else if (this._virtualCount > 0 && this._physicalCount > 0) {
-        // otherwise, assign the initial focused index.
         this._focusedIndex = this._virtualStart;
         this._focusedItem = this._physicalItems[this._physicalStart];
       }
     },
-
     _isIndexRendered: function(idx) {
       return idx >= this._virtualStart && idx <= this._virtualEnd;
     },
-
     _isIndexVisible: function(idx) {
       return idx >= this.firstVisibleIndex && idx <= this.lastVisibleIndex;
     },
-
     _getPhysicalIndex: function(idx) {
       return this._physicalIndexForKey[this._collection.getKey(this._getNormalizedItem(idx))];
     },
-
     _focusPhysicalItem: function(idx) {
       if (idx < 0 || idx >= this._virtualCount) {
         return;
       }
       this._restoreFocusedItem();
-      // scroll to index to make sure it's rendered
       if (!this._isIndexRendered(idx)) {
         this.scrollToIndex(idx);
       }
-
       var physicalItem = this._physicalItems[this._getPhysicalIndex(idx)];
       var model = physicalItem._templateInstance;
       var focusable;
-
-      // set a secret tab index
       model.tabIndex = SECRET_TABINDEX;
-      // check if focusable element is the physical item
       if (physicalItem.tabIndex === SECRET_TABINDEX) {
-       focusable = physicalItem;
+        focusable = physicalItem;
       }
-      // search for the element which tabindex is bound to the secret tab index
       if (!focusable) {
         focusable = Polymer.dom(physicalItem).querySelector('[tabindex="' + SECRET_TABINDEX + '"]');
       }
-      // restore the tab index
       model.tabIndex = 0;
-      // focus the focusable element
       this._focusedIndex = idx;
       focusable && focusable.focus();
     },
-
     _removeFocusedItem: function() {
       if (this._offscreenFocusedItem) {
         Polymer.dom(this).removeChild(this._offscreenFocusedItem);
       }
       this._offscreenFocusedItem = null;
       this._focusBackfillItem = null;
       this._focusedItem = null;
       this._focusedIndex = -1;
     },
-
     _createFocusBackfillItem: function() {
       var pidx, fidx = this._focusedIndex;
       if (this._offscreenFocusedItem || fidx < 0) {
         return;
       }
       if (!this._focusBackfillItem) {
-        // create a physical item, so that it backfills the focused item.
         var stampedTemplate = this.stamp(null);
         this._focusBackfillItem = stampedTemplate.root.querySelector('*');
         Polymer.dom(this).appendChild(stampedTemplate.root);
       }
-      // get the physical index for the focused index
       pidx = this._getPhysicalIndex(fidx);
-
       if (pidx != null) {
-        // set the offcreen focused physical item
         this._offscreenFocusedItem = this._physicalItems[pidx];
-        // backfill the focused physical item
         this._physicalItems[pidx] = this._focusBackfillItem;
-        // hide the focused physical
         this.translate3d(0, HIDDEN_Y, 0, this._offscreenFocusedItem);
       }
     },
-
     _restoreFocusedItem: function() {
       var pidx, fidx = this._focusedIndex;
-
       if (!this._offscreenFocusedItem || this._focusedIndex < 0) {
         return;
       }
-      // assign models to the focused index
       this._assignModels();
-      // get the new physical index for the focused index
       pidx = this._getPhysicalIndex(fidx);
-
       if (pidx != null) {
-        // flip the focus backfill
         this._focusBackfillItem = this._physicalItems[pidx];
-        // restore the focused physical item
         this._physicalItems[pidx] = this._offscreenFocusedItem;
-        // reset the offscreen focused item
         this._offscreenFocusedItem = null;
-        // hide the physical item that backfills
         this.translate3d(0, HIDDEN_Y, 0, this._focusBackfillItem);
       }
     },
-
     _didFocus: function(e) {
       var targetModel = this.modelForElement(e.target);
       var focusedModel = this._focusedItem ? this._focusedItem._templateInstance : null;
       var hasOffscreenFocusedItem = this._offscreenFocusedItem !== null;
       var fidx = this._focusedIndex;
-
       if (!targetModel || !focusedModel) {
         return;
       }
       if (focusedModel === targetModel) {
-        // if the user focused the same item, then bring it into view if it's not visible
         if (!this._isIndexVisible(fidx)) {
           this.scrollToIndex(fidx);
         }
       } else {
         this._restoreFocusedItem();
-        // restore tabIndex for the currently focused item
         focusedModel.tabIndex = -1;
-        // set the tabIndex for the next focused item
         targetModel.tabIndex = 0;
         fidx = targetModel[this.indexAs];
         this._focusedIndex = fidx;
         this._focusedItem = this._physicalItems[this._getPhysicalIndex(fidx)];
-
         if (hasOffscreenFocusedItem && !this._offscreenFocusedItem) {
           this._update();
         }
       }
     },
-
     _didMoveUp: function() {
       this._focusPhysicalItem(this._focusedIndex - 1);
     },
-
     _didMoveDown: function(e) {
-      // disable scroll when pressing the down key
       e.detail.keyboardEvent.preventDefault();
       this._focusPhysicalItem(this._focusedIndex + 1);
     },
-
     _didEnter: function(e) {
       this._focusPhysicalItem(this._focusedIndex);
       this._selectionHandler(e.detail.keyboardEvent);
     }
   });
+})();
 
-})();
 Polymer({
+  is: 'iron-scroll-threshold',
+  properties: {
+    upperThreshold: {
+      type: Number,
+      value: 100
+    },
+    lowerThreshold: {
+      type: Number,
+      value: 100
+    },
+    upperTriggered: {
+      type: Boolean,
+      value: false,
+      notify: true,
+      readOnly: true
+    },
+    lowerTriggered: {
+      type: Boolean,
+      value: false,
+      notify: true,
+      readOnly: true
+    },
+    horizontal: {
+      type: Boolean,
+      value: false
+    }
+  },
+  behaviors: [ Polymer.IronScrollTargetBehavior ],
+  observers: [ '_setOverflow(scrollTarget)', '_initCheck(horizontal, isAttached)' ],
+  get _defaultScrollTarget() {
+    return this;
+  },
+  _setOverflow: function(scrollTarget) {
+    this.style.overflow = scrollTarget === this ? 'auto' : '';
+  },
+  _scrollHandler: function() {
+    var THROTTLE_THRESHOLD = 200;
+    if (!this.isDebouncerActive('_checkTheshold')) {
+      this.debounce('_checkTheshold', function() {
+        this.checkScrollThesholds();
+      }, THROTTLE_THRESHOLD);
+    }
+  },
+  _initCheck: function(horizontal, isAttached) {
+    if (isAttached) {
+      this.debounce('_init', function() {
+        this.clearTriggers();
+        this.checkScrollThesholds();
+      });
+    }
+  },
+  checkScrollThesholds: function() {
+    if (!this.scrollTarget || this.lowerTriggered && this.upperTriggered) {
+      return;
+    }
+    var upperScrollValue = this.horizontal ? this._scrollLeft : this._scrollTop;
+    var lowerScrollValue = this.horizontal ? this.scrollTarget.scrollWidth - this._scrollTargetWidth - this._scrollLeft : this.scrollTarget.scrollHeight - this._scrollTargetHeight - this._scrollTop;
+    if (upperScrollValue <= this.upperThreshold && !this.upperTriggered) {
+      this._setUpperTriggered(true);
+      this.fire('upper-threshold');
+    }
+    if (lowerScrollValue <= this.lowerThreshold && !this.lowerTriggered) {
+      this._setLowerTriggered(true);
+      this.fire('lower-threshold');
+    }
+  },
+  clearTriggers: function() {
+    this._setUpperTriggered(false);
+    this._setLowerTriggered(false);
+  }
+});
 
-    is: 'iron-scroll-threshold',
-
-    properties: {
-
-      /**
-       * Distance from the top (or left, for horizontal) bound of the scroller
-       * where the "upper trigger" will fire.
-       */
-      upperThreshold: {
-        type: Number,
-        value: 100
-      },
-
-      /**
-       * Distance from the bottom (or right, for horizontal) bound of the scroller
-       * where the "lower trigger" will fire.
-       */
-      lowerThreshold: {
-        type: Number,
-        value: 100
-      },
-
-      /**
-       * Read-only value that tracks the triggered state of the upper threshold.
-       */
-      upperTriggered: {
-        type: Boolean,
-        value: false,
-        notify: true,
-        readOnly: true
-      },
-
-      /**
-       * Read-only value that tracks the triggered state of the lower threshold.
-       */
-      lowerTriggered: {
-        type: Boolean,
-        value: false,
-        notify: true,
-        readOnly: true
-      },
-
-      /**
-       * True if the orientation of the scroller is horizontal.
-       */
-      horizontal: {
-        type: Boolean,
-        value: false
-      }
-    },
-
-    behaviors: [
-      Polymer.IronScrollTargetBehavior
-    ],
-
-    observers: [
-      '_setOverflow(scrollTarget)',
-      '_initCheck(horizontal, isAttached)'
-    ],
-
-    get _defaultScrollTarget() {
-      return this;
-    },
-
-    _setOverflow: function(scrollTarget) {
-      this.style.overflow = scrollTarget === this ? 'auto' : '';
-    },
-
-    _scrollHandler: function() {
-      // throttle the work on the scroll event
-      var THROTTLE_THRESHOLD = 200;
-      if (!this.isDebouncerActive('_checkTheshold')) {
-        this.debounce('_checkTheshold', function() {
-          this.checkScrollThesholds();
-        }, THROTTLE_THRESHOLD);
-      }
-    },
-
-    _initCheck: function(horizontal, isAttached) {
-      if (isAttached) {
-        this.debounce('_init', function() {
-          this.clearTriggers();
-          this.checkScrollThesholds();
-        });
-      }
-    },
-
-    /**
-     * Checks the scroll thresholds.
-     * This method is automatically called by iron-scroll-threshold.
-     *
-     * @method checkScrollThesholds
-     */
-    checkScrollThesholds: function() {
-      if (!this.scrollTarget || (this.lowerTriggered && this.upperTriggered)) {
-        return;
-      }
-      var upperScrollValue = this.horizontal ? this._scrollLeft : this._scrollTop;
-      var lowerScrollValue = this.horizontal ?
-          this.scrollTarget.scrollWidth - this._scrollTargetWidth - this._scrollLeft :
-              this.scrollTarget.scrollHeight - this._scrollTargetHeight - this._scrollTop;
-
-      // Detect upper threshold
-      if (upperScrollValue <= this.upperThreshold && !this.upperTriggered) {
-        this._setUpperTriggered(true);
-        this.fire('upper-threshold');
-      }
-      // Detect lower threshold
-      if (lowerScrollValue <= this.lowerThreshold && !this.lowerTriggered) {
-        this._setLowerTriggered(true);
-        this.fire('lower-threshold');
-      }
-    },
-
-    /**
-     * Clear the upper and lower threshold states.
-     *
-     * @method clearTriggers
-     */
-    clearTriggers: function() {
-      this._setUpperTriggered(false);
-      this._setLowerTriggered(false);
-    }
-
-    /**
-     * Fires when the lower threshold has been reached.
-     *
-     * @event lower-threshold
-     */
-
-    /**
-     * Fires when the upper threshold has been reached.
-     *
-     * @event upper-threshold
-     */
-
-  });
 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
 Polymer({
   is: 'history-list',
-
-  behaviors: [HistoryListBehavior],
-
+  behaviors: [ HistoryListBehavior ],
   properties: {
-    // The search term for the current query. Set when the query returns.
     searchedTerm: {
       type: String,
-      value: '',
-    },
-
+      value: ''
+    },
     querying: Boolean,
-
-    // An array of history entries in reverse chronological order.
     historyData_: Array,
-
     resultLoadingDisabled_: {
       type: Boolean,
-      value: false,
-    },
-  },
-
+      value: false
+    }
+  },
   listeners: {
-    'scroll': 'notifyListScroll_',
-    'remove-bookmark-stars': 'removeBookmarkStars_',
-  },
-
-  /** @override */
+    scroll: 'notifyListScroll_',
+    'remove-bookmark-stars': 'removeBookmarkStars_'
+  },
   attached: function() {
-    // It is possible (eg, when middle clicking the reload button) for all other
-    // resize events to fire before the list is attached and can be measured.
-    // Adding another resize here ensures it will get sized correctly.
-    /** @type {IronListElement} */(this.$['infinite-list']).notifyResize();
+    this.$['infinite-list'].notifyResize();
     this.$['infinite-list'].scrollTarget = this;
     this.$['scroll-threshold'].scrollTarget = this;
   },
-
-  /**
-   * Remove bookmark star for history items with matching URLs.
-   * @param {{detail: !string}} e
-   * @private
-   */
   removeBookmarkStars_: function(e) {
     var url = e.detail;
-
-    if (this.historyData_ === undefined)
-      return;
-
+    if (this.historyData_ === undefined) return;
     for (var i = 0; i < this.historyData_.length; i++) {
-      if (this.historyData_[i].url == url)
-        this.set('historyData_.' + i + '.starred', false);
-    }
-  },
-
-  /**
-   * Disables history result loading when there are no more history results.
-   */
+      if (this.historyData_[i].url == url) this.set('historyData_.' + i + '.starred', false);
+    }
+  },
   disableResultLoading: function() {
     this.resultLoadingDisabled_ = true;
   },
-
-  /**
-   * Adds the newly updated history results into historyData_. Adds new fields
-   * for each result.
-   * @param {!Array<!HistoryEntry>} historyResults The new history results.
-   * @param {boolean} incremental Whether the result is from loading more
-   * history, or a new search/list reload.
-   */
   addNewResults: function(historyResults, incremental) {
     var results = historyResults.slice();
-    /** @type {IronScrollThresholdElement} */(this.$['scroll-threshold'])
-        .clearTriggers();
-
+    this.$['scroll-threshold'].clearTriggers();
     if (!incremental) {
       this.resultLoadingDisabled_ = false;
-      if (this.historyData_)
-        this.splice('historyData_', 0, this.historyData_.length);
+      if (this.historyData_) this.splice('historyData_', 0, this.historyData_.length);
       this.fire('unselect-all');
     }
-
     if (this.historyData_) {
-      // If we have previously received data, push the new items onto the
-      // existing array.
       results.unshift('historyData_');
       this.push.apply(this, results);
     } else {
-      // The first time we receive data, use set() to ensure the iron-list is
-      // initialized correctly.
       this.set('historyData_', results);
     }
   },
-
-  /**
-   * Called when the page is scrolled to near the bottom of the list.
-   * @private
-   */
   loadMoreData_: function() {
-    if (this.resultLoadingDisabled_ || this.querying)
-      return;
-
+    if (this.resultLoadingDisabled_ || this.querying) return;
     this.fire('load-more-history');
   },
-
-  /**
-   * Check whether the time difference between the given history item and the
-   * next one is large enough for a spacer to be required.
-   * @param {HistoryEntry} item
-   * @param {number} index The index of |item| in |historyData_|.
-   * @param {number} length The length of |historyData_|.
-   * @return {boolean} Whether or not time gap separator is required.
-   * @private
-   */
   needsTimeGap_: function(item, index, length) {
-    return md_history.HistoryItem.needsTimeGap(
-        this.historyData_, index, this.searchedTerm);
-  },
-
-  /**
-   * True if the given item is the beginning of a new card.
-   * @param {HistoryEntry} item
-   * @param {number} i Index of |item| within |historyData_|.
-   * @param {number} length
-   * @return {boolean}
-   * @private
-   */
+    return md_history.HistoryItem.needsTimeGap(this.historyData_, index, this.searchedTerm);
+  },
   isCardStart_: function(item, i, length) {
-    if (length == 0 || i > length - 1)
-      return false;
-    return i == 0 ||
-        this.historyData_[i].dateRelativeDay !=
-        this.historyData_[i - 1].dateRelativeDay;
-  },
-
-  /**
-   * True if the given item is the end of a card.
-   * @param {HistoryEntry} item
-   * @param {number} i Index of |item| within |historyData_|.
-   * @param {number} length
-   * @return {boolean}
-   * @private
-   */
+    if (length == 0 || i > length - 1) return false;
+    return i == 0 || this.historyData_[i].dateRelativeDay != this.historyData_[i - 1].dateRelativeDay;
+  },
   isCardEnd_: function(item, i, length) {
-    if (length == 0 || i > length - 1)
-      return false;
-    return i == length - 1 ||
-        this.historyData_[i].dateRelativeDay !=
-        this.historyData_[i + 1].dateRelativeDay;
-  },
-
-  /**
-   * @param {number} index
-   * @return {boolean}
-   * @private
-   */
+    if (length == 0 || i > length - 1) return false;
+    return i == length - 1 || this.historyData_[i].dateRelativeDay != this.historyData_[i + 1].dateRelativeDay;
+  },
   isFirstItem_: function(index) {
     return index == 0;
   },
-
-  /**
-   * @private
-   */
   notifyListScroll_: function() {
     this.fire('history-list-scrolled');
   },
-
-  /**
-   * @param {number} index
-   * @return {string}
-   * @private
-   */
   pathForItem_: function(index) {
     return 'historyData_.' + index;
-  },
+  }
 });
+
 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
-/**
- * @fileoverview
- * history-lazy-render is a simple variant of dom-if designed for lazy rendering
- * of elements that are accessed imperatively.
- * Usage:
- *   <template is="history-lazy-render" id="menu">
- *     <heavy-menu></heavy-menu>
- *   </template>
- *
- *   this.$.menu.get().then(function(menu) {
- *     menu.show();
- *   });
- */
-
 Polymer({
   is: 'history-lazy-render',
-  extends: 'template',
-
-  behaviors: [
-    Polymer.Templatizer
-  ],
-
-  /** @private {Promise<Element>} */
+  "extends": 'template',
+  behaviors: [ Polymer.Templatizer ],
   _renderPromise: null,
-
-  /** @private {TemplateInstance} */
   _instance: null,
-
-  /**
-   * Stamp the template into the DOM tree asynchronously
-   * @return {Promise<Element>} Promise which resolves when the template has
-   *   been stamped.
-   */
   get: function() {
     if (!this._renderPromise) {
       this._renderPromise = new Promise(function(resolve) {
         this._debounceTemplate(function() {
           this._render();
           this._renderPromise = null;
           resolve(this.getIfExists());
         }.bind(this));
       }.bind(this));
     }
     return this._renderPromise;
   },
-
-  /**
-   * @return {?Element} The element contained in the template, if it has
-   *   already been stamped.
-   */
   getIfExists: function() {
     if (this._instance) {
       var children = this._instance._children;
-
       for (var i = 0; i < children.length; i++) {
-        if (children[i].nodeType == Node.ELEMENT_NODE)
-          return children[i];
+        if (children[i].nodeType == Node.ELEMENT_NODE) return children[i];
       }
     }
     return null;
   },
-
   _render: function() {
-    if (!this.ctor)
-      this.templatize(this);
+    if (!this.ctor) this.templatize(this);
     var parentNode = this.parentNode;
     if (parentNode && !this._instance) {
-      this._instance = /** @type {TemplateInstance} */(this.stamp({}));
+      this._instance = this.stamp({});
       var root = this._instance.root;
       parentNode.insertBefore(root, this);
     }
   },
-
-  /**
-   * @param {string} prop
-   * @param {Object} value
-   */
   _forwardParentProp: function(prop, value) {
-    if (this._instance)
-      this._instance.__setProperty(prop, value, true);
-  },
-
-  /**
-   * @param {string} path
-   * @param {Object} value
-   */
+    if (this._instance) this._instance.__setProperty(prop, value, true);
+  },
   _forwardParentPath: function(path, value) {
-    if (this._instance)
-      this._instance._notifyPath(path, value, true);
+    if (this._instance) this._instance._notifyPath(path, value, true);
   }
 });
+
 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
 Polymer({
   is: 'history-list-container',
-
   properties: {
-    // The path of the currently selected page.
     selectedPage_: String,
-
-    // Whether domain-grouped history is enabled.
     grouped: Boolean,
-
-    /** @type {!QueryState} */
     queryState: Object,
-
-    /** @type {!QueryResult} */
-    queryResult: Object,
-  },
-
-  observers: [
-    'groupedRangeChanged_(queryState.range)',
-  ],
-
+    queryResult: Object
+  },
+  observers: [ 'groupedRangeChanged_(queryState.range)' ],
   listeners: {
     'history-list-scrolled': 'closeMenu_',
     'load-more-history': 'loadMoreHistory_',
-    'toggle-menu': 'toggleMenu_',
-  },
-
-  /**
-   * @param {HistoryQuery} info An object containing information about the
-   *    query.
-   * @param {!Array<HistoryEntry>} results A list of results.
-   */
+    'toggle-menu': 'toggleMenu_'
+  },
   historyResult: function(info, results) {
     this.initializeResults_(info, results);
     this.closeMenu_();
-
     if (this.selectedPage_ == 'grouped-list') {
       this.$$('#grouped-list').historyData = results;
       return;
     }
-
-    var list = /** @type {HistoryListElement} */(this.$['infinite-list']);
+    var list = this.$['infinite-list'];
     list.addNewResults(results, this.queryState.incremental);
-    if (info.finished)
-      list.disableResultLoading();
-  },
-
-  /**
-   * Queries the history backend for results based on queryState.
-   * @param {boolean} incremental Whether the new query should continue where
-   *    the previous query stopped.
-   */
+    if (info.finished) list.disableResultLoading();
+  },
   queryHistory: function(incremental) {
     var queryState = this.queryState;
-    // Disable querying until the first set of results have been returned. If
-    // there is a search, query immediately to support search query params from
-    // the URL.
     var noResults = !this.queryResult || this.queryResult.results == null;
-    if (queryState.queryingDisabled ||
-        (!this.queryState.searchTerm && noResults)) {
+    if (queryState.queryingDisabled || !this.queryState.searchTerm && noResults) {
       return;
     }
-
-    // Close any open dialog if a new query is initiated.
     var dialog = this.$.dialog.getIfExists();
-    if (!incremental && dialog && dialog.open)
-      dialog.close();
-
+    if (!incremental && dialog && dialog.open) dialog.close();
     this.set('queryState.querying', true);
     this.set('queryState.incremental', incremental);
-
     var lastVisitTime = 0;
     if (incremental) {
       var lastVisit = this.queryResult.results.slice(-1)[0];
       lastVisitTime = lastVisit ? lastVisit.time : 0;
     }
-
-    var maxResults =
-      queryState.range == HistoryRange.ALL_TIME ? RESULTS_PER_PAGE : 0;
-    chrome.send('queryHistory', [
-      queryState.searchTerm, queryState.groupedOffset, queryState.range,
-      lastVisitTime, maxResults
-    ]);
-  },
-
+    var maxResults = queryState.range == HistoryRange.ALL_TIME ? RESULTS_PER_PAGE : 0;
+    chrome.send('queryHistory', [ queryState.searchTerm, queryState.groupedOffset, queryState.range, lastVisitTime, maxResults ]);
+  },
   historyDeleted: function() {
-    // Do not reload the list when there are items checked.
-    if (this.getSelectedItemCount() > 0)
-      return;
-
-    // Reload the list with current search state.
+    if (this.getSelectedItemCount() > 0) return;
     this.queryHistory(false);
   },
-
-  /** @return {number} */
   getSelectedItemCount: function() {
     return this.getSelectedList_().selectedPaths.size;
   },
-
   unselectAllItems: function(count) {
     var selectedList = this.getSelectedList_();
-    if (selectedList)
-      selectedList.unselectAllItems(count);
-  },
-
-  /**
-   * Delete all the currently selected history items. Will prompt the user with
-   * a dialog to confirm that the deletion should be performed.
-   */
+    if (selectedList) selectedList.unselectAllItems(count);
+  },
   deleteSelectedWithPrompt: function() {
-    if (!loadTimeData.getBoolean('allowDeletingHistory'))
-      return;
+    if (!loadTimeData.getBoolean('allowDeletingHistory')) return;
     this.$.dialog.get().then(function(dialog) {
       dialog.showModal();
     });
   },
-
-  /**
-   * @param {HistoryRange} range
-   * @private
-   */
   groupedRangeChanged_: function(range) {
-    this.selectedPage_ = this.queryState.range == HistoryRange.ALL_TIME ?
-      'infinite-list' : 'grouped-list';
-
+    this.selectedPage_ = this.queryState.range == HistoryRange.ALL_TIME ? 'infinite-list' : 'grouped-list';
     this.queryHistory(false);
   },
-
-  /** @private */
-  loadMoreHistory_: function() { this.queryHistory(true); },
-
-  /**
-   * @param {HistoryQuery} info
-   * @param {!Array<HistoryEntry>} results
-   * @private
-   */
+  loadMoreHistory_: function() {
+    this.queryHistory(true);
+  },
   initializeResults_: function(info, results) {
-    if (results.length == 0)
-      return;
-
+    if (results.length == 0) return;
     var currentDate = results[0].dateRelativeDay;
-
     for (var i = 0; i < results.length; i++) {
-      // Sets the default values for these fields to prevent undefined types.
       results[i].selected = false;
-      results[i].readableTimestamp =
-          info.term == '' ? results[i].dateTimeOfDay : results[i].dateShort;
-
+      results[i].readableTimestamp = info.term == '' ? results[i].dateTimeOfDay : results[i].dateShort;
       if (results[i].dateRelativeDay != currentDate) {
         currentDate = results[i].dateRelativeDay;
       }
     }
   },
-
-  /** @private */
   onDialogConfirmTap_: function() {
     this.getSelectedList_().deleteSelected();
     var dialog = assert(this.$.dialog.getIfExists());
     dialog.close();
   },
-
-  /** @private */
   onDialogCancelTap_: function() {
     var dialog = assert(this.$.dialog.getIfExists());
     dialog.close();
   },
-
-  /**
-   * Closes the overflow menu.
-   * @private
-   */
   closeMenu_: function() {
     var menu = this.$.sharedMenu.getIfExists();
-    if (menu)
-      menu.closeMenu();
-  },
-
-  /**
-   * Opens the overflow menu unless the menu is already open and the same button
-   * is pressed.
-   * @param {{detail: {item: !HistoryEntry, target: !HTMLElement}}} e
-   * @return {Promise<Element>}
-   * @private
-   */
+    if (menu) menu.closeMenu();
+  },
   toggleMenu_: function(e) {
     var target = e.detail.target;
     return this.$.sharedMenu.get().then(function(menu) {
-      /** @type {CrSharedMenuElement} */(menu).toggleMenu(
-        target, e.detail);
-    });
-  },
-
-  /** @private */
+      menu.toggleMenu(target, e.detail);
+    });
+  },
   onMoreFromSiteTap_: function() {
     var menu = assert(this.$.sharedMenu.getIfExists());
-    this.fire('search-domain', {domain: menu.itemData.item.domain});
+    this.fire('search-domain', {
+      domain: menu.itemData.item.domain
+    });
     menu.closeMenu();
   },
-
-  /** @private */
   onRemoveFromHistoryTap_: function() {
     var menu = assert(this.$.sharedMenu.getIfExists());
     var itemData = menu.itemData;
-    md_history.BrowserService.getInstance()
-        .deleteItems([itemData.item])
-        .then(function(items) {
-          this.getSelectedList_().removeItemsByPath([itemData.path]);
-          // This unselect-all is to reset the toolbar when deleting a selected
-          // item. TODO(tsergeant): Make this automatic based on observing list
-          // modifications.
-          this.fire('unselect-all');
-        }.bind(this));
+    md_history.BrowserService.getInstance().deleteItems([ itemData.item ]).then(function(items) {
+      this.getSelectedList_().removeItemsByPath([ itemData.path ]);
+      this.fire('unselect-all');
+    }.bind(this));
     menu.closeMenu();
   },
-
-  /**
-   * @return {HTMLElement}
-   * @private
-   */
   getSelectedList_: function() {
     return this.$.content.selectedItem;
-  },
+  }
 });
+
 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
 Polymer({
   is: 'history-synced-device-card',
-
   properties: {
-    // Name of the synced device.
     device: String,
-
-    // When the device information was last updated.
     lastUpdateTime: String,
-
-    /**
-     * The list of tabs open for this device.
-     * @type {!Array<!ForeignSessionTab>}
-     */
     tabs: {
       type: Array,
-      value: function() { return []; },
+      value: function() {
+        return [];
+      },
       observer: 'updateIcons_'
     },
-
-    /**
-     * The indexes where a window separator should be shown. The use of a
-     * separate array here is necessary for window separators to appear
-     * correctly in search. See http://crrev.com/2022003002 for more details.
-     * @type {!Array<number>}
-     */
     separatorIndexes: Array,
-
-    // Whether the card is open.
     opened: Boolean,
-
     searchTerm: String,
-
-    // Internal identifier for the device.
-    sessionTag: String,
-  },
-
-  /**
-   * Open a single synced tab. Listens to 'click' rather than 'tap'
-   * to determine what modifier keys were pressed.
-   * @param {DomRepeatClickEvent} e
-   * @private
-   */
+    sessionTag: String
+  },
   openTab_: function(e) {
-    var tab = /** @type {ForeignSessionTab} */(e.model.tab);
-    md_history.BrowserService.getInstance().openForeignSessionTab(
-        this.sessionTag, tab.windowId, tab.sessionId, e);
+    var tab = e.model.tab;
+    md_history.BrowserService.getInstance().openForeignSessionTab(this.sessionTag, tab.windowId, tab.sessionId, e);
     e.preventDefault();
   },
-
-  /**
-   * Toggles the dropdown display of synced tabs for each device card.
-   */
   toggleTabCard: function() {
     this.$.collapse.toggle();
-    this.$['dropdown-indicator'].icon =
-        this.$.collapse.opened ? 'cr:expand-less' : 'cr:expand-more';
-  },
-
-  /**
-   * When the synced tab information is set, the icon associated with the tab
-   * website is also set.
-   * @private
-   */
+    this.$['dropdown-indicator'].icon = this.$.collapse.opened ? 'cr:expand-less' : 'cr:expand-more';
+  },
   updateIcons_: function() {
     this.async(function() {
       var icons = Polymer.dom(this.root).querySelectorAll('.website-icon');
-
       for (var i = 0; i < this.tabs.length; i++) {
-        icons[i].style.backgroundImage =
-            cr.icon.getFaviconImageSet(this.tabs[i].url);
-      }
-    });
-  },
-
-  /** @private */
+        icons[i].style.backgroundImage = cr.icon.getFaviconImageSet(this.tabs[i].url);
+      }
+    });
+  },
   isWindowSeparatorIndex_: function(index, separatorIndexes) {
     return this.separatorIndexes.indexOf(index) != -1;
   },
-
-  /**
-   * @param {boolean} opened
-   * @return {string}
-   * @private
-   */
   getCollapseIcon_: function(opened) {
     return opened ? 'cr:expand-less' : 'cr:expand-more';
   },
-
-  /**
-   * @param {boolean} opened
-   * @return {string}
-   * @private
-   */
   getCollapseTitle_: function(opened) {
-    return opened ? loadTimeData.getString('collapseSessionButton') :
-                    loadTimeData.getString('expandSessionButton');
-  },
-
-  /**
-   * @param {CustomEvent} e
-   * @private
-   */
+    return opened ? loadTimeData.getString('collapseSessionButton') : loadTimeData.getString('expandSessionButton');
+  },
   onMenuButtonTap_: function(e) {
     this.fire('toggle-menu', {
       target: Polymer.dom(e).localTarget,
       tag: this.sessionTag
     });
-    e.stopPropagation();  // Prevent iron-collapse.
-  },
+    e.stopPropagation();
+  }
 });
+
 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
-/**
- * @typedef {{device: string,
- *           lastUpdateTime: string,
- *           opened: boolean,
- *           separatorIndexes: !Array<number>,
- *           timestamp: number,
- *           tabs: !Array<!ForeignSessionTab>,
- *           tag: string}}
- */
 var ForeignDeviceInternal;
 
 Polymer({
   is: 'history-synced-device-manager',
-
   properties: {
-    /**
-     * @type {?Array<!ForeignSession>}
-     */
     sessionList: {
       type: Array,
       observer: 'updateSyncedDevices'
     },
-
     searchTerm: {
       type: String,
       observer: 'searchTermChanged'
     },
-
-    /**
-     * An array of synced devices with synced tab data.
-     * @type {!Array<!ForeignDeviceInternal>}
-     */
     syncedDevices_: {
       type: Array,
-      value: function() { return []; }
-    },
-
-    /** @private */
+      value: function() {
+        return [];
+      }
+    },
     signInState_: {
       type: Boolean,
-      value: loadTimeData.getBoolean('isUserSignedIn'),
-    },
-
-    /** @private */
+      value: loadTimeData.getBoolean('isUserSignedIn')
+    },
     guestSession_: {
       type: Boolean,
-      value: loadTimeData.getBoolean('isGuestSession'),
-    },
-
-    /** @private */
+      value: loadTimeData.getBoolean('isGuestSession')
+    },
     fetchingSyncedTabs_: {
       type: Boolean,
-      value: false,
-    }
-  },
-
+      value: false
+    }
+  },
   listeners: {
     'toggle-menu': 'onToggleMenu_',
-    'scroll': 'onListScroll_'
-  },
-
-  /** @override */
+    scroll: 'onListScroll_'
+  },
   attached: function() {
-    // Update the sign in state.
     chrome.send('otherDevicesInitialized');
   },
-
-  /**
-   * @param {!ForeignSession} session
-   * @return {!ForeignDeviceInternal}
-   */
   createInternalDevice_: function(session) {
     var tabs = [];
     var separatorIndexes = [];
     for (var i = 0; i < session.windows.length; i++) {
       var windowId = session.windows[i].sessionId;
       var newTabs = session.windows[i].tabs;
-      if (newTabs.length == 0)
-        continue;
-
+      if (newTabs.length == 0) continue;
       newTabs.forEach(function(tab) {
         tab.windowId = windowId;
       });
-
       var windowAdded = false;
       if (!this.searchTerm) {
-        // Add all the tabs if there is no search term.
         tabs = tabs.concat(newTabs);
         windowAdded = true;
       } else {
         var searchText = this.searchTerm.toLowerCase();
         for (var j = 0; j < newTabs.length; j++) {
           var tab = newTabs[j];
           if (tab.title.toLowerCase().indexOf(searchText) != -1) {
             tabs.push(tab);
             windowAdded = true;
           }
         }
       }
-      if (windowAdded && i != session.windows.length - 1)
-        separatorIndexes.push(tabs.length - 1);
+      if (windowAdded && i != session.windows.length - 1) separatorIndexes.push(tabs.length - 1);
     }
     return {
       device: session.name,
       lastUpdateTime: '– ' + session.modifiedTime,
       opened: true,
       separatorIndexes: separatorIndexes,
       timestamp: session.timestamp,
       tabs: tabs,
-      tag: session.tag,
+      tag: session.tag
     };
   },
-
   onSignInTap_: function() {
     chrome.send('startSignInFlow');
   },
-
   onListScroll_: function() {
     var menu = this.$.menu.getIfExists();
-    if (menu)
-      menu.closeMenu();
-  },
-
+    if (menu) menu.closeMenu();
+  },
   onToggleMenu_: function(e) {
     this.$.menu.get().then(function(menu) {
       menu.toggleMenu(e.detail.target, e.detail.tag);
     });
   },
-
   onOpenAllTap_: function() {
     var menu = assert(this.$.menu.getIfExists());
-    md_history.BrowserService.getInstance().openForeignSessionAllTabs(
-        menu.itemData);
+    md_history.BrowserService.getInstance().openForeignSessionAllTabs(menu.itemData);
     menu.closeMenu();
   },
-
   onDeleteSessionTap_: function() {
     var menu = assert(this.$.menu.getIfExists());
-    md_history.BrowserService.getInstance().deleteForeignSession(
-        menu.itemData);
+    md_history.BrowserService.getInstance().deleteForeignSession(menu.itemData);
     menu.closeMenu();
   },
-
-  /** @private */
   clearDisplayedSyncedDevices_: function() {
     this.syncedDevices_ = [];
   },
-
-  /**
-   * Decide whether or not should display no synced tabs message.
-   * @param {boolean} signInState
-   * @param {number} syncedDevicesLength
-   * @param {boolean} guestSession
-   * @return {boolean}
-   */
-  showNoSyncedMessage: function(
-      signInState, syncedDevicesLength, guestSession) {
-    if (guestSession)
-      return true;
-
+  showNoSyncedMessage: function(signInState, syncedDevicesLength, guestSession) {
+    if (guestSession) return true;
     return signInState && syncedDevicesLength == 0;
   },
-
-  /**
-   * Shows the signin guide when the user is not signed in and not in a guest
-   * session.
-   * @param {boolean} signInState
-   * @param {boolean} guestSession
-   * @return {boolean}
-   */
   showSignInGuide: function(signInState, guestSession) {
     var show = !signInState && !guestSession;
     if (show) {
-      md_history.BrowserService.getInstance().recordAction(
-          'Signin_Impression_FromRecentTabs');
-    }
-
+      md_history.BrowserService.getInstance().recordAction('Signin_Impression_FromRecentTabs');
+    }
     return show;
   },
-
-  /**
-   * Decide what message should be displayed when user is logged in and there
-   * are no synced tabs.
-   * @param {boolean} fetchingSyncedTabs
-   * @return {string}
-   */
   noSyncedTabsMessage: function(fetchingSyncedTabs) {
-    return loadTimeData.getString(
-        fetchingSyncedTabs ? 'loading' : 'noSyncedResults');
-  },
-
-  /**
-   * Replaces the currently displayed synced tabs with |sessionList|. It is
-   * common for only a single session within the list to have changed, We try to
-   * avoid doing extra work in this case. The logic could be more intelligent
-   * about updating individual tabs rather than replacing whole sessions, but
-   * this approach seems to have acceptable performance.
-   * @param {?Array<!ForeignSession>} sessionList
-   */
+    return loadTimeData.getString(fetchingSyncedTabs ? 'loading' : 'noSyncedResults');
+  },
   updateSyncedDevices: function(sessionList) {
     this.fetchingSyncedTabs_ = false;
-
-    if (!sessionList)
-      return;
-
-    // First, update any existing devices that have changed.
+    if (!sessionList) return;
     var updateCount = Math.min(sessionList.length, this.syncedDevices_.length);
     for (var i = 0; i < updateCount; i++) {
       var oldDevice = this.syncedDevices_[i];
-      if (oldDevice.tag != sessionList[i].tag ||
-          oldDevice.timestamp != sessionList[i].timestamp) {
-        this.splice(
-            'syncedDevices_', i, 1, this.createInternalDevice_(sessionList[i]));
-      }
-    }
-
+      if (oldDevice.tag != sessionList[i].tag || oldDevice.timestamp != sessionList[i].timestamp) {
+        this.splice('syncedDevices_', i, 1, this.createInternalDevice_(sessionList[i]));
+      }
+    }
     if (sessionList.length >= this.syncedDevices_.length) {
-      // The list grew; append new items.
       for (var i = updateCount; i < sessionList.length; i++) {
         this.push('syncedDevices_', this.createInternalDevice_(sessionList[i]));
       }
     } else {
-      // The list shrank; remove deleted items.
-      this.splice(
-          'syncedDevices_', updateCount,
-          this.syncedDevices_.length - updateCount);
-    }
-  },
-
-  /**
-   * End fetching synced tabs when sync is disabled.
-   */
+      this.splice('syncedDevices_', updateCount, this.syncedDevices_.length - updateCount);
+    }
+  },
   tabSyncDisabled: function() {
     this.fetchingSyncedTabs_ = false;
     this.clearDisplayedSyncedDevices_();
   },
-
-  /**
-   * Get called when user's sign in state changes, this will affect UI of synced
-   * tabs page. Sign in promo gets displayed when user is signed out, and
-   * different messages are shown when there are no synced tabs.
-   * @param {boolean} isUserSignedIn
-   */
   updateSignInState: function(isUserSignedIn) {
-    // If user's sign in state didn't change, then don't change message or
-    // update UI.
-    if (this.signInState_ == isUserSignedIn)
-      return;
-
+    if (this.signInState_ == isUserSignedIn) return;
     this.signInState_ = isUserSignedIn;
-
-    // User signed out, clear synced device list and show the sign in promo.
     if (!isUserSignedIn) {
       this.clearDisplayedSyncedDevices_();
       return;
     }
-    // User signed in, show the loading message when querying for synced
-    // devices.
     this.fetchingSyncedTabs_ = true;
   },
-
   searchTermChanged: function(searchTerm) {
     this.clearDisplayedSyncedDevices_();
     this.updateSyncedDevices(this.sessionList);
   }
 });
-/**
-  `iron-selector` is an element which can be used to manage a list of elements
-  that can be selected.  Tapping on the item will make the item selected.  The `selected` indicates
-  which item is being selected.  The default is to use the index of the item.
-
-  Example:
-
-      <iron-selector selected="0">
-        <div>Item 1</div>
-        <div>Item 2</div>
-        <div>Item 3</div>
-      </iron-selector>
-
-  If you want to use the attribute value of an element for `selected` instead of the index,
-  set `attrForSelected` to the name of the attribute.  For example, if you want to select item by
-  `name`, set `attrForSelected` to `name`.
-
-  Example:
-
-      <iron-selector attr-for-selected="name" selected="foo">
-        <div name="foo">Foo</div>
-        <div name="bar">Bar</div>
-        <div name="zot">Zot</div>
-      </iron-selector>
-
-  You can specify a default fallback with `fallbackSelection` in case the `selected` attribute does
-  not match the `attrForSelected` attribute of any elements.
-
-  Example:
-
-        <iron-selector attr-for-selected="name" selected="non-existing"
-                       fallback-selection="default">
-          <div name="foo">Foo</div>
-          <div name="bar">Bar</div>
-          <div name="default">Default</div>
-        </iron-selector>
-
-  Note: When the selector is multi, the selection will set to `fallbackSelection` iff
-  the number of matching elements is zero.
-
-  `iron-selector` is not styled. Use the `iron-selected` CSS class to style the selected element.
-
-  Example:
-
-      <style>
-        .iron-selected {
-          background: #eee;
-        }
-      </style>
-
-      ...
-
-      <iron-selector selected="0">
-        <div>Item 1</div>
-        <div>Item 2</div>
-        <div>Item 3</div>
-      </iron-selector>
-
-  @demo demo/index.html
-  */
-
-  Polymer({
-
-    is: 'iron-selector',
-
-    behaviors: [
-      Polymer.IronMultiSelectableBehavior
-    ]
-
-  });
+
+Polymer({
+  is: 'iron-selector',
+  behaviors: [ Polymer.IronMultiSelectableBehavior ]
+});
+
 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
 Polymer({
   is: 'history-side-bar',
-
   properties: {
     selectedPage: {
       type: String,
       notify: true
     },
-
     route: Object,
-
     showFooter: Boolean,
-
-    // If true, the sidebar is contained within an app-drawer.
     drawer: {
       type: Boolean,
       reflectToAttribute: true
-    },
-  },
-
-  /** @private */
+    }
+  },
   onSelectorActivate_: function() {
     this.fire('history-close-drawer');
   },
-
-  /**
-   * Relocates the user to the clear browsing data section of the settings page.
-   * @param {Event} e
-   * @private
-   */
   onClearBrowsingDataTap_: function(e) {
     md_history.BrowserService.getInstance().openClearBrowsingData();
     e.preventDefault();
   },
-
-  /**
-   * @param {Object} route
-   * @private
-   */
   getQueryString_: function(route) {
     return window.location.search;
   }
 });
+
 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
 Polymer({
   is: 'history-app',
-
   properties: {
     showSidebarFooter: Boolean,
-
-    // The id of the currently selected page.
-    selectedPage_: {type: String, value: 'history', observer: 'unselectAll'},
-
-    // Whether domain-grouped history is enabled.
-    grouped_: {type: Boolean, reflectToAttribute: true},
-
-    /** @type {!QueryState} */
+    selectedPage_: {
+      type: String,
+      value: 'history',
+      observer: 'unselectAll'
+    },
+    grouped_: {
+      type: Boolean,
+      reflectToAttribute: true
+    },
     queryState_: {
       type: Object,
       value: function() {
         return {
-          // Whether the most recent query was incremental.
           incremental: false,
-          // A query is initiated by page load.
           querying: true,
           queryingDisabled: false,
           _range: HistoryRange.ALL_TIME,
           searchTerm: '',
-          // TODO(calamity): Make history toolbar buttons change the offset
           groupedOffset: 0,
-
-          set range(val) { this._range = Number(val); },
-          get range() { return this._range; },
+          set range(val) {
+            this._range = Number(val);
+          },
+          get range() {
+            return this._range;
+          }
         };
       }
     },
-
-   /** @type {!QueryResult} */
     queryResult_: {
       type: Object,
       value: function() {
         return {
           info: null,
           results: null,
-          sessionList: null,
+          sessionList: null
         };
       }
     },
-
-    // Route data for the current page.
     routeData_: Object,
-
-    // The query params for the page.
     queryParams_: Object,
-
-    // True if the window is narrow enough for the page to have a drawer.
-    hasDrawer_: Boolean,
-  },
-
-  observers: [
-    // routeData_.page <=> selectedPage
-    'routeDataChanged_(routeData_.page)',
-    'selectedPageChanged_(selectedPage_)',
-
-    // queryParams_.q <=> queryState.searchTerm
-    'searchTermChanged_(queryState_.searchTerm)',
-    'searchQueryParamChanged_(queryParams_.q)',
-
-  ],
-
-  // TODO(calamity): Replace these event listeners with data bound properties.
+    hasDrawer_: Boolean
+  },
+  observers: [ 'routeDataChanged_(routeData_.page)', 'selectedPageChanged_(selectedPage_)', 'searchTermChanged_(queryState_.searchTerm)', 'searchQueryParamChanged_(queryParams_.q)' ],
   listeners: {
     'cr-menu-tap': 'onMenuTap_',
     'history-checkbox-select': 'checkboxSelected',
     'unselect-all': 'unselectAll',
     'delete-selected': 'deleteSelected',
     'search-domain': 'searchDomain_',
-    'history-close-drawer': 'closeDrawer_',
-  },
-
-  /** @override */
+    'history-close-drawer': 'closeDrawer_'
+  },
   ready: function() {
     this.grouped_ = loadTimeData.getBoolean('groupByDomain');
-
     cr.ui.decorate('command', cr.ui.Command);
     document.addEventListener('canExecute', this.onCanExecute_.bind(this));
     document.addEventListener('command', this.onCommand_.bind(this));
-
-    // Redirect legacy search URLs to URLs compatible with material history.
     if (window.location.hash) {
-      window.location.href = window.location.href.split('#')[0] + '?' +
-          window.location.hash.substr(1);
-    }
-  },
-
-  /** @private */
+      window.location.href = window.location.href.split('#')[0] + '?' + window.location.hash.substr(1);
+    }
+  },
   onMenuTap_: function() {
     var drawer = this.$$('#drawer');
-    if (drawer)
-      drawer.toggle();
-  },
-
-  /**
-   * Listens for history-item being selected or deselected (through checkbox)
-   * and changes the view of the top toolbar.
-   * @param {{detail: {countAddition: number}}} e
-   */
+    if (drawer) drawer.toggle();
+  },
   checkboxSelected: function(e) {
-    var toolbar = /** @type {HistoryToolbarElement} */ (this.$.toolbar);
-    toolbar.count = /** @type {HistoryListContainerElement} */ (this.$.history)
-                        .getSelectedItemCount();
-  },
-
-  /**
-   * Listens for call to cancel selection and loops through all items to set
-   * checkbox to be unselected.
-   * @private
-   */
+    var toolbar = this.$.toolbar;
+    toolbar.count = this.$.history.getSelectedItemCount();
+  },
   unselectAll: function() {
-    var listContainer =
-        /** @type {HistoryListContainerElement} */ (this.$.history);
-    var toolbar = /** @type {HistoryToolbarElement} */ (this.$.toolbar);
+    var listContainer = this.$.history;
+    var toolbar = this.$.toolbar;
     listContainer.unselectAllItems(toolbar.count);
     toolbar.count = 0;
   },
-
   deleteSelected: function() {
     this.$.history.deleteSelectedWithPrompt();
   },
-
-  /**
-   * @param {HistoryQuery} info An object containing information about the
-   *    query.
-   * @param {!Array<HistoryEntry>} results A list of results.
-   */
   historyResult: function(info, results) {
     this.set('queryState_.querying', false);
     this.set('queryResult_.info', info);
     this.set('queryResult_.results', results);
-    var listContainer =
-        /** @type {HistoryListContainerElement} */ (this.$['history']);
+    var listContainer = this.$['history'];
     listContainer.historyResult(info, results);
   },
-
-  /**
-   * Fired when the user presses 'More from this site'.
-   * @param {{detail: {domain: string}}} e
-   */
-  searchDomain_: function(e) { this.$.toolbar.setSearchTerm(e.detail.domain); },
-
-  /**
-   * @param {Event} e
-   * @private
-   */
+  searchDomain_: function(e) {
+    this.$.toolbar.setSearchTerm(e.detail.domain);
+  },
   onCanExecute_: function(e) {
-    e = /** @type {cr.ui.CanExecuteEvent} */(e);
+    e = e;
     switch (e.command.id) {
-      case 'find-command':
-        e.canExecute = true;
-        break;
-      case 'slash-command':
-        e.canExecute = !this.$.toolbar.searchBar.isSearchFocused();
-        break;
-      case 'delete-command':
-        e.canExecute = this.$.toolbar.count > 0;
-        break;
-    }
-  },
-
-  /**
-   * @param {string} searchTerm
-   * @private
-   */
+     case 'find-command':
+      e.canExecute = true;
+      break;
+
+     case 'slash-command':
+      e.canExecute = !this.$.toolbar.searchBar.isSearchFocused();
+      break;
+
+     case 'delete-command':
+      e.canExecute = this.$.toolbar.count > 0;
+      break;
+    }
+  },
   searchTermChanged_: function(searchTerm) {
     this.set('queryParams_.q', searchTerm || null);
     this.$['history'].queryHistory(false);
   },
-
-  /**
-   * @param {string} searchQuery
-   * @private
-   */
   searchQueryParamChanged_: function(searchQuery) {
     this.$.toolbar.setSearchTerm(searchQuery || '');
   },
-
-  /**
-   * @param {Event} e
-   * @private
-   */
   onCommand_: function(e) {
-    if (e.command.id == 'find-command' || e.command.id == 'slash-command')
-      this.$.toolbar.showSearchField();
-    if (e.command.id == 'delete-command')
-      this.deleteSelected();
-  },
-
-  /**
-   * @param {!Array<!ForeignSession>} sessionList Array of objects describing
-   *     the sessions from other devices.
-   * @param {boolean} isTabSyncEnabled Is tab sync enabled for this profile?
-   */
+    if (e.command.id == 'find-command' || e.command.id == 'slash-command') this.$.toolbar.showSearchField();
+    if (e.command.id == 'delete-command') this.deleteSelected();
+  },
   setForeignSessions: function(sessionList, isTabSyncEnabled) {
     if (!isTabSyncEnabled) {
-      var syncedDeviceManagerElem =
-      /** @type {HistorySyncedDeviceManagerElement} */this
-          .$$('history-synced-device-manager');
-      if (syncedDeviceManagerElem)
-        syncedDeviceManagerElem.tabSyncDisabled();
+      var syncedDeviceManagerElem = this.$$('history-synced-device-manager');
+      if (syncedDeviceManagerElem) syncedDeviceManagerElem.tabSyncDisabled();
       return;
     }
-
     this.set('queryResult_.sessionList', sessionList);
   },
-
-  /**
-   * Called when browsing data is cleared.
-   */
   historyDeleted: function() {
     this.$.history.historyDeleted();
   },
-
-  /**
-   * Update sign in state of synced device manager after user logs in or out.
-   * @param {boolean} isUserSignedIn
-   */
   updateSignInState: function(isUserSignedIn) {
-    var syncedDeviceManagerElem =
-      /** @type {HistorySyncedDeviceManagerElement} */this
-          .$$('history-synced-device-manager');
-    if (syncedDeviceManagerElem)
-      syncedDeviceManagerElem.updateSignInState(isUserSignedIn);
-  },
-
-  /**
-   * @param {string} selectedPage
-   * @return {boolean}
-   * @private
-   */
+    var syncedDeviceManagerElem = this.$$('history-synced-device-manager');
+    if (syncedDeviceManagerElem) syncedDeviceManagerElem.updateSignInState(isUserSignedIn);
+  },
   syncedTabsSelected_: function(selectedPage) {
     return selectedPage == 'syncedTabs';
   },
-
-  /**
-   * @param {boolean} querying
-   * @param {boolean} incremental
-   * @param {string} searchTerm
-   * @return {boolean} Whether a loading spinner should be shown (implies the
-   *     backend is querying a new search term).
-   * @private
-   */
   shouldShowSpinner_: function(querying, incremental, searchTerm) {
     return querying && !incremental && searchTerm != '';
   },
-
-  /**
-   * @param {string} page
-   * @private
-   */
   routeDataChanged_: function(page) {
     this.selectedPage_ = page;
   },
-
-  /**
-   * @param {string} selectedPage
-   * @private
-   */
   selectedPageChanged_: function(selectedPage) {
     this.set('routeData_.page', selectedPage);
   },
-
-  /**
-   * This computed binding is needed to make the iron-pages selector update when
-   * the synced-device-manager is instantiated for the first time. Otherwise the
-   * fallback selection will continue to be used after the corresponding item is
-   * added as a child of iron-pages.
-   * @param {string} selectedPage
-   * @param {Array} items
-   * @return {string}
-   * @private
-   */
   getSelectedPage_: function(selectedPage, items) {
     return selectedPage;
   },
-
-  /** @private */
   closeDrawer_: function() {
     var drawer = this.$$('#drawer');
-    if (drawer)
-      drawer.close();
-  },
+    if (drawer) drawer.close();
+  }
 });