update to polymer js 0.5.1

pkg/polymer/lib/src/js/polymer/polymer.js

Index: pkg/polymer/lib/src/js/polymer/polymer.js
diff --git a/pkg/polymer/lib/src/js/polymer/polymer.js b/pkg/polymer/lib/src/js/polymer/polymer.js
index 6a8caf22aaa867d74747e12d18a4e0c8c65aa86d..b8b62b0a6dcf83d08e443c9f857d048172eff9d1 100644
--- a/pkg/polymer/lib/src/js/polymer/polymer.js
+++ b/pkg/polymer/lib/src/js/polymer/polymer.js
@@ -7,9 +7,11823 @@
  * Code distributed by Google as part of the polymer project is also
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
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-//# sourceMappingURL=polymer.js.map
+// @version 0.5.1
+window.PolymerGestures = {};
+
+(function(scope) {
+  var HAS_FULL_PATH = false;
+
+  // test for full event path support
+  var pathTest = document.createElement('meta');
+  if (pathTest.createShadowRoot) {
+    var sr = pathTest.createShadowRoot();
+    var s = document.createElement('span');
+    sr.appendChild(s);
+    pathTest.addEventListener('testpath', function(ev) {
+      if (ev.path) {
+        // if the span is in the event path, then path[0] is the real source for all events
+        HAS_FULL_PATH = ev.path[0] === s;
+      }
+      ev.stopPropagation();
+    });
+    var ev = new CustomEvent('testpath', {bubbles: true});
+    // must add node to DOM to trigger event listener
+    document.head.appendChild(pathTest);
+    s.dispatchEvent(ev);
+    pathTest.parentNode.removeChild(pathTest);
+    sr = s = null;
+  }
+  pathTest = null;
+
+  var target = {
+    shadow: function(inEl) {
+      if (inEl) {
+        return inEl.shadowRoot || inEl.webkitShadowRoot;
+      }
+    },
+    canTarget: function(shadow) {
+      return shadow && Boolean(shadow.elementFromPoint);
+    },
+    targetingShadow: function(inEl) {
+      var s = this.shadow(inEl);
+      if (this.canTarget(s)) {
+        return s;
+      }
+    },
+    olderShadow: function(shadow) {
+      var os = shadow.olderShadowRoot;
+      if (!os) {
+        var se = shadow.querySelector('shadow');
+        if (se) {
+          os = se.olderShadowRoot;
+        }
+      }
+      return os;
+    },
+    allShadows: function(element) {
+      var shadows = [], s = this.shadow(element);
+      while(s) {
+        shadows.push(s);
+        s = this.olderShadow(s);
+      }
+      return shadows;
+    },
+    searchRoot: function(inRoot, x, y) {
+      var t, st, sr, os;
+      if (inRoot) {
+        t = inRoot.elementFromPoint(x, y);
+        if (t) {
+          // found element, check if it has a ShadowRoot
+          sr = this.targetingShadow(t);
+        } else if (inRoot !== document) {
+          // check for sibling roots
+          sr = this.olderShadow(inRoot);
+        }
+        // search other roots, fall back to light dom element
+        return this.searchRoot(sr, x, y) || t;
+      }
+    },
+    owner: function(element) {
+      if (!element) {
+        return document;
+      }
+      var s = element;
+      // walk up until you hit the shadow root or document
+      while (s.parentNode) {
+        s = s.parentNode;
+      }
+      // the owner element is expected to be a Document or ShadowRoot
+      if (s.nodeType != Node.DOCUMENT_NODE && s.nodeType != Node.DOCUMENT_FRAGMENT_NODE) {
+        s = document;
+      }
+      return s;
+    },
+    findTarget: function(inEvent) {
+      if (HAS_FULL_PATH && inEvent.path && inEvent.path.length) {
+        return inEvent.path[0];
+      }
+      var x = inEvent.clientX, y = inEvent.clientY;
+      // if the listener is in the shadow root, it is much faster to start there
+      var s = this.owner(inEvent.target);
+      // if x, y is not in this root, fall back to document search
+      if (!s.elementFromPoint(x, y)) {
+        s = document;
+      }
+      return this.searchRoot(s, x, y);
+    },
+    findTouchAction: function(inEvent) {
+      var n;
+      if (HAS_FULL_PATH && inEvent.path && inEvent.path.length) {
+        var path = inEvent.path;
+        for (var i = 0; i < path.length; i++) {
+          n = path[i];
+          if (n.nodeType === Node.ELEMENT_NODE && n.hasAttribute('touch-action')) {
+            return n.getAttribute('touch-action');
+          }
+        }
+      } else {
+        n = inEvent.target;
+        while(n) {
+          if (n.nodeType === Node.ELEMENT_NODE && n.hasAttribute('touch-action')) {
+            return n.getAttribute('touch-action');
+          }
+          n = n.parentNode || n.host;
+        }
+      }
+      // auto is default
+      return "auto";
+    },
+    LCA: function(a, b) {
+      if (a === b) {
+        return a;
+      }
+      if (a && !b) {
+        return a;
+      }
+      if (b && !a) {
+        return b;
+      }
+      if (!b && !a) {
+        return document;
+      }
+      // fast case, a is a direct descendant of b or vice versa
+      if (a.contains && a.contains(b)) {
+        return a;
+      }
+      if (b.contains && b.contains(a)) {
+        return b;
+      }
+      var adepth = this.depth(a);
+      var bdepth = this.depth(b);
+      var d = adepth - bdepth;
+      if (d >= 0) {
+        a = this.walk(a, d);
+      } else {
+        b = this.walk(b, -d);
+      }
+      while (a && b && a !== b) {
+        a = a.parentNode || a.host;
+        b = b.parentNode || b.host;
+      }
+      return a;
+    },
+    walk: function(n, u) {
+      for (var i = 0; n && (i < u); i++) {
+        n = n.parentNode || n.host;
+      }
+      return n;
+    },
+    depth: function(n) {
+      var d = 0;
+      while(n) {
+        d++;
+        n = n.parentNode || n.host;
+      }
+      return d;
+    },
+    deepContains: function(a, b) {
+      var common = this.LCA(a, b);
+      // if a is the common ancestor, it must "deeply" contain b
+      return common === a;
+    },
+    insideNode: function(node, x, y) {
+      var rect = node.getBoundingClientRect();
+      return (rect.left <= x) && (x <= rect.right) && (rect.top <= y) && (y <= rect.bottom);
+    },
+    path: function(event) {
+      var p;
+      if (HAS_FULL_PATH && event.path && event.path.length) {
+        p = event.path;
+      } else {
+        p = [];
+        var n = this.findTarget(event);
+        while (n) {
+          p.push(n);
+          n = n.parentNode || n.host;
+        }
+      }
+      return p;
+    }
+  };
+  scope.targetFinding = target;
+  /**
+   * Given an event, finds the "deepest" node that could have been the original target before ShadowDOM retargetting
+   *
+   * @param {Event} Event An event object with clientX and clientY properties
+   * @return {Element} The probable event origninator
+   */
+  scope.findTarget = target.findTarget.bind(target);
+  /**
+   * Determines if the "container" node deeply contains the "containee" node, including situations where the "containee" is contained by one or more ShadowDOM
+   * roots.
+   *
+   * @param {Node} container
+   * @param {Node} containee
+   * @return {Boolean}
+   */
+  scope.deepContains = target.deepContains.bind(target);
+
+  /**
+   * Determines if the x/y position is inside the given node.
+   *
+   * Example:
+   *
+   *     function upHandler(event) {
+   *       var innode = PolymerGestures.insideNode(event.target, event.clientX, event.clientY);
+   *       if (innode) {
+   *         // wait for tap?
+   *       } else {
+   *         // tap will never happen
+   *       }
+   *     }
+   *
+   * @param {Node} node
+   * @param {Number} x Screen X position
+   * @param {Number} y screen Y position
+   * @return {Boolean}
+   */
+  scope.insideNode = target.insideNode;
+
+})(window.PolymerGestures);
+
+(function() {
+  function shadowSelector(v) {
+    return 'html /deep/ ' + selector(v);
+  }
+  function selector(v) {
+    return '[touch-action="' + v + '"]';
+  }
+  function rule(v) {
+    return '{ -ms-touch-action: ' + v + '; touch-action: ' + v + ';}';
+  }
+  var attrib2css = [
+    'none',
+    'auto',
+    'pan-x',
+    'pan-y',
+    {
+      rule: 'pan-x pan-y',
+      selectors: [
+        'pan-x pan-y',
+        'pan-y pan-x'
+      ]
+    },
+    'manipulation'
+  ];
+  var styles = '';
+  // only install stylesheet if the browser has touch action support
+  var hasTouchAction = typeof document.head.style.touchAction === 'string';
+  // only add shadow selectors if shadowdom is supported
+  var hasShadowRoot = !window.ShadowDOMPolyfill && document.head.createShadowRoot;
+
+  if (hasTouchAction) {
+    attrib2css.forEach(function(r) {
+      if (String(r) === r) {
+        styles += selector(r) + rule(r) + '\n';
+        if (hasShadowRoot) {
+          styles += shadowSelector(r) + rule(r) + '\n';
+        }
+      } else {
+        styles += r.selectors.map(selector) + rule(r.rule) + '\n';
+        if (hasShadowRoot) {
+          styles += r.selectors.map(shadowSelector) + rule(r.rule) + '\n';
+        }
+      }
+    });
+
+    var el = document.createElement('style');
+    el.textContent = styles;
+    document.head.appendChild(el);
+  }
+})();
+
+/**
+ * This is the constructor for new PointerEvents.
+ *
+ * New Pointer Events must be given a type, and an optional dictionary of
+ * initialization properties.
+ *
+ * Due to certain platform requirements, events returned from the constructor
+ * identify as MouseEvents.
+ *
+ * @constructor
+ * @param {String} inType The type of the event to create.
+ * @param {Object} [inDict] An optional dictionary of initial event properties.
+ * @return {Event} A new PointerEvent of type `inType` and initialized with properties from `inDict`.
+ */
+(function(scope) {
+
+  var MOUSE_PROPS = [
+    'bubbles',
+    'cancelable',
+    'view',
+    'detail',
+    'screenX',
+    'screenY',
+    'clientX',
+    'clientY',
+    'ctrlKey',
+    'altKey',
+    'shiftKey',
+    'metaKey',
+    'button',
+    'relatedTarget',
+    'pageX',
+    'pageY'
+  ];
+
+  var MOUSE_DEFAULTS = [
+    false,
+    false,
+    null,
+    null,
+    0,
+    0,
+    0,
+    0,
+    false,
+    false,
+    false,
+    false,
+    0,
+    null,
+    0,
+    0
+  ];
+
+  var NOP_FACTORY = function(){ return function(){}; };
+
+  var eventFactory = {
+    // TODO(dfreedm): this is overridden by tap recognizer, needs review
+    preventTap: NOP_FACTORY,
+    makeBaseEvent: function(inType, inDict) {
+      var e = document.createEvent('Event');
+      e.initEvent(inType, inDict.bubbles || false, inDict.cancelable || false);
+      e.preventTap = eventFactory.preventTap(e);
+      return e;
+    },
+    makeGestureEvent: function(inType, inDict) {
+      inDict = inDict || Object.create(null);
+
+      var e = this.makeBaseEvent(inType, inDict);
+      for (var i = 0, keys = Object.keys(inDict), k; i < keys.length; i++) {
+        k = keys[i];
+        e[k] = inDict[k];
+      }
+      return e;
+    },
+    makePointerEvent: function(inType, inDict) {
+      inDict = inDict || Object.create(null);
+
+      var e = this.makeBaseEvent(inType, inDict);
+      // define inherited MouseEvent properties
+      for(var i = 0, p; i < MOUSE_PROPS.length; i++) {
+        p = MOUSE_PROPS[i];
+        e[p] = inDict[p] || MOUSE_DEFAULTS[i];
+      }
+      e.buttons = inDict.buttons || 0;
+
+      // Spec requires that pointers without pressure specified use 0.5 for down
+      // state and 0 for up state.
+      var pressure = 0;
+      if (inDict.pressure) {
+        pressure = inDict.pressure;
+      } else {
+        pressure = e.buttons ? 0.5 : 0;
+      }
+
+      // add x/y properties aliased to clientX/Y
+      e.x = e.clientX;
+      e.y = e.clientY;
+
+      // define the properties of the PointerEvent interface
+      e.pointerId = inDict.pointerId || 0;
+      e.width = inDict.width || 0;
+      e.height = inDict.height || 0;
+      e.pressure = pressure;
+      e.tiltX = inDict.tiltX || 0;
+      e.tiltY = inDict.tiltY || 0;
+      e.pointerType = inDict.pointerType || '';
+      e.hwTimestamp = inDict.hwTimestamp || 0;
+      e.isPrimary = inDict.isPrimary || false;
+      e._source = inDict._source || '';
+      return e;
+    }
+  };
+
+  scope.eventFactory = eventFactory;
+})(window.PolymerGestures);
+
+/**
+ * This module implements an map of pointer states
+ */
+(function(scope) {
+  var USE_MAP = window.Map && window.Map.prototype.forEach;
+  var POINTERS_FN = function(){ return this.size; };
+  function PointerMap() {
+    if (USE_MAP) {
+      var m = new Map();
+      m.pointers = POINTERS_FN;
+      return m;
+    } else {
+      this.keys = [];
+      this.values = [];
+    }
+  }
+
+  PointerMap.prototype = {
+    set: function(inId, inEvent) {
+      var i = this.keys.indexOf(inId);
+      if (i > -1) {
+        this.values[i] = inEvent;
+      } else {
+        this.keys.push(inId);
+        this.values.push(inEvent);
+      }
+    },
+    has: function(inId) {
+      return this.keys.indexOf(inId) > -1;
+    },
+    'delete': function(inId) {
+      var i = this.keys.indexOf(inId);
+      if (i > -1) {
+        this.keys.splice(i, 1);
+        this.values.splice(i, 1);
+      }
+    },
+    get: function(inId) {
+      var i = this.keys.indexOf(inId);
+      return this.values[i];
+    },
+    clear: function() {
+      this.keys.length = 0;
+      this.values.length = 0;
+    },
+    // return value, key, map
+    forEach: function(callback, thisArg) {
+      this.values.forEach(function(v, i) {
+        callback.call(thisArg, v, this.keys[i], this);
+      }, this);
+    },
+    pointers: function() {
+      return this.keys.length;
+    }
+  };
+
+  scope.PointerMap = PointerMap;
+})(window.PolymerGestures);
+
+(function(scope) {
+  var CLONE_PROPS = [
+    // MouseEvent
+    'bubbles',
+    'cancelable',
+    'view',
+    'detail',
+    'screenX',
+    'screenY',
+    'clientX',
+    'clientY',
+    'ctrlKey',
+    'altKey',
+    'shiftKey',
+    'metaKey',
+    'button',
+    'relatedTarget',
+    // DOM Level 3
+    'buttons',
+    // PointerEvent
+    'pointerId',
+    'width',
+    'height',
+    'pressure',
+    'tiltX',
+    'tiltY',
+    'pointerType',
+    'hwTimestamp',
+    'isPrimary',
+    // event instance
+    'type',
+    'target',
+    'currentTarget',
+    'which',
+    'pageX',
+    'pageY',
+    'timeStamp',
+    // gesture addons
+    'preventTap',
+    'tapPrevented',
+    '_source'
+  ];
+
+  var CLONE_DEFAULTS = [
+    // MouseEvent
+    false,
+    false,
+    null,
+    null,
+    0,
+    0,
+    0,
+    0,
+    false,
+    false,
+    false,
+    false,
+    0,
+    null,
+    // DOM Level 3
+    0,
+    // PointerEvent
+    0,
+    0,
+    0,
+    0,
+    0,
+    0,
+    '',
+    0,
+    false,
+    // event instance
+    '',
+    null,
+    null,
+    0,
+    0,
+    0,
+    0,
+    function(){},
+    false
+  ];
+
+  var HAS_SVG_INSTANCE = (typeof SVGElementInstance !== 'undefined');
+
+  var eventFactory = scope.eventFactory;
+
+  // set of recognizers to run for the currently handled event
+  var currentGestures;
+
+  /**
+   * This module is for normalizing events. Mouse and Touch events will be
+   * collected here, and fire PointerEvents that have the same semantics, no
+   * matter the source.
+   * Events fired:
+   *   - pointerdown: a pointing is added
+   *   - pointerup: a pointer is removed
+   *   - pointermove: a pointer is moved
+   *   - pointerover: a pointer crosses into an element
+   *   - pointerout: a pointer leaves an element
+   *   - pointercancel: a pointer will no longer generate events
+   */
+  var dispatcher = {
+    IS_IOS: false,
+    pointermap: new scope.PointerMap(),
+    requiredGestures: new scope.PointerMap(),
+    eventMap: Object.create(null),
+    // Scope objects for native events.
+    // This exists for ease of testing.
+    eventSources: Object.create(null),
+    eventSourceList: [],
+    gestures: [],
+    // map gesture event -> {listeners: int, index: gestures[int]}
+    dependencyMap: {
+      // make sure down and up are in the map to trigger "register"
+      down: {listeners: 0, index: -1},
+      up: {listeners: 0, index: -1}
+    },
+    gestureQueue: [],
+    /**
+     * Add a new event source that will generate pointer events.
+     *
+     * `inSource` must contain an array of event names named `events`, and
+     * functions with the names specified in the `events` array.
+     * @param {string} name A name for the event source
+     * @param {Object} source A new source of platform events.
+     */
+    registerSource: function(name, source) {
+      var s = source;
+      var newEvents = s.events;
+      if (newEvents) {
+        newEvents.forEach(function(e) {
+          if (s[e]) {
+            this.eventMap[e] = s[e].bind(s);
+          }
+        }, this);
+        this.eventSources[name] = s;
+        this.eventSourceList.push(s);
+      }
+    },
+    registerGesture: function(name, source) {
+      var obj = Object.create(null);
+      obj.listeners = 0;
+      obj.index = this.gestures.length;
+      for (var i = 0, g; i < source.exposes.length; i++) {
+        g = source.exposes[i].toLowerCase();
+        this.dependencyMap[g] = obj;
+      }
+      this.gestures.push(source);
+    },
+    register: function(element, initial) {
+      var l = this.eventSourceList.length;
+      for (var i = 0, es; (i < l) && (es = this.eventSourceList[i]); i++) {
+        // call eventsource register
+        es.register.call(es, element, initial);
+      }
+    },
+    unregister: function(element) {
+      var l = this.eventSourceList.length;
+      for (var i = 0, es; (i < l) && (es = this.eventSourceList[i]); i++) {
+        // call eventsource register
+        es.unregister.call(es, element);
+      }
+    },
+    // EVENTS
+    down: function(inEvent) {
+      this.requiredGestures.set(inEvent.pointerId, currentGestures);
+      this.fireEvent('down', inEvent);
+    },
+    move: function(inEvent) {
+      // pipe move events into gesture queue directly
+      inEvent.type = 'move';
+      this.fillGestureQueue(inEvent);
+    },
+    up: function(inEvent) {
+      this.fireEvent('up', inEvent);
+      this.requiredGestures.delete(inEvent.pointerId);
+    },
+    cancel: function(inEvent) {
+      inEvent.tapPrevented = true;
+      this.fireEvent('up', inEvent);
+      this.requiredGestures.delete(inEvent.pointerId);
+    },
+    addGestureDependency: function(node, currentGestures) {
+      var gesturesWanted = node._pgEvents;
+      if (gesturesWanted && currentGestures) {
+        var gk = Object.keys(gesturesWanted);
+        for (var i = 0, r, ri, g; i < gk.length; i++) {
+          // gesture
+          g = gk[i];
+          if (gesturesWanted[g] > 0) {
+            // lookup gesture recognizer
+            r = this.dependencyMap[g];
+            // recognizer index
+            ri = r ? r.index : -1;
+            currentGestures[ri] = true;
+          }
+        }
+      }
+    },
+    // LISTENER LOGIC
+    eventHandler: function(inEvent) {
+      // This is used to prevent multiple dispatch of events from
+      // platform events. This can happen when two elements in different scopes
+      // are set up to create pointer events, which is relevant to Shadow DOM.
+
+      var type = inEvent.type;
+
+      // only generate the list of desired events on "down"
+      if (type === 'touchstart' || type === 'mousedown' || type === 'pointerdown' || type === 'MSPointerDown') {
+        if (!inEvent._handledByPG) {
+          currentGestures = {};
+        }
+
+        // in IOS mode, there is only a listener on the document, so this is not re-entrant
+        if (this.IS_IOS) {
+          var ev = inEvent;
+          if (type === 'touchstart') {
+            var ct = inEvent.changedTouches[0];
+            // set up a fake event to give to the path builder
+            ev = {target: inEvent.target, clientX: ct.clientX, clientY: ct.clientY, path: inEvent.path};
+          }
+          // use event path if available, otherwise build a path from target finding
+          var nodes = inEvent.path || scope.targetFinding.path(ev);
+          for (var i = 0, n; i < nodes.length; i++) {
+            n = nodes[i];
+            this.addGestureDependency(n, currentGestures);
+          }
+        } else {
+          this.addGestureDependency(inEvent.currentTarget, currentGestures);
+        }
+      }
+
+      if (inEvent._handledByPG) {
+        return;
+      }
+      var fn = this.eventMap && this.eventMap[type];
+      if (fn) {
+        fn(inEvent);
+      }
+      inEvent._handledByPG = true;
+    },
+    // set up event listeners
+    listen: function(target, events) {
+      for (var i = 0, l = events.length, e; (i < l) && (e = events[i]); i++) {
+        this.addEvent(target, e);
+      }
+    },
+    // remove event listeners
+    unlisten: function(target, events) {
+      for (var i = 0, l = events.length, e; (i < l) && (e = events[i]); i++) {
+        this.removeEvent(target, e);
+      }
+    },
+    addEvent: function(target, eventName) {
+      target.addEventListener(eventName, this.boundHandler);
+    },
+    removeEvent: function(target, eventName) {
+      target.removeEventListener(eventName, this.boundHandler);
+    },
+    // EVENT CREATION AND TRACKING
+    /**
+     * Creates a new Event of type `inType`, based on the information in
+     * `inEvent`.
+     *
+     * @param {string} inType A string representing the type of event to create
+     * @param {Event} inEvent A platform event with a target
+     * @return {Event} A PointerEvent of type `inType`
+     */
+    makeEvent: function(inType, inEvent) {
+      var e = eventFactory.makePointerEvent(inType, inEvent);
+      e.preventDefault = inEvent.preventDefault;
+      e.tapPrevented = inEvent.tapPrevented;
+      e._target = e._target || inEvent.target;
+      return e;
+    },
+    // make and dispatch an event in one call
+    fireEvent: function(inType, inEvent) {
+      var e = this.makeEvent(inType, inEvent);
+      return this.dispatchEvent(e);
+    },
+    /**
+     * Returns a snapshot of inEvent, with writable properties.
+     *
+     * @param {Event} inEvent An event that contains properties to copy.
+     * @return {Object} An object containing shallow copies of `inEvent`'s
+     *    properties.
+     */
+    cloneEvent: function(inEvent) {
+      var eventCopy = Object.create(null), p;
+      for (var i = 0; i < CLONE_PROPS.length; i++) {
+        p = CLONE_PROPS[i];
+        eventCopy[p] = inEvent[p] || CLONE_DEFAULTS[i];
+        // Work around SVGInstanceElement shadow tree
+        // Return the <use> element that is represented by the instance for Safari, Chrome, IE.
+        // This is the behavior implemented by Firefox.
+        if (p === 'target' || p === 'relatedTarget') {
+          if (HAS_SVG_INSTANCE && eventCopy[p] instanceof SVGElementInstance) {
+            eventCopy[p] = eventCopy[p].correspondingUseElement;
+          }
+        }
+      }
+      // keep the semantics of preventDefault
+      eventCopy.preventDefault = function() {
+        inEvent.preventDefault();
+      };
+      return eventCopy;
+    },
+    /**
+     * Dispatches the event to its target.
+     *
+     * @param {Event} inEvent The event to be dispatched.
+     * @return {Boolean} True if an event handler returns true, false otherwise.
+     */
+    dispatchEvent: function(inEvent) {
+      var t = inEvent._target;
+      if (t) {
+        t.dispatchEvent(inEvent);
+        // clone the event for the gesture system to process
+        // clone after dispatch to pick up gesture prevention code
+        var clone = this.cloneEvent(inEvent);
+        clone.target = t;
+        this.fillGestureQueue(clone);
+      }
+    },
+    gestureTrigger: function() {
+      // process the gesture queue
+      for (var i = 0, e, rg; i < this.gestureQueue.length; i++) {
+        e = this.gestureQueue[i];
+        rg = e._requiredGestures;
+        if (rg) {
+          for (var j = 0, g, fn; j < this.gestures.length; j++) {
+            // only run recognizer if an element in the source event's path is listening for those gestures
+            if (rg[j]) {
+              g = this.gestures[j];
+              fn = g[e.type];
+              if (fn) {
+                fn.call(g, e);
+              }
+            }
+          }
+        }
+      }
+      this.gestureQueue.length = 0;
+    },
+    fillGestureQueue: function(ev) {
+      // only trigger the gesture queue once
+      if (!this.gestureQueue.length) {
+        requestAnimationFrame(this.boundGestureTrigger);
+      }
+      ev._requiredGestures = this.requiredGestures.get(ev.pointerId);
+      this.gestureQueue.push(ev);
+    }
+  };
+  dispatcher.boundHandler = dispatcher.eventHandler.bind(dispatcher);
+  dispatcher.boundGestureTrigger = dispatcher.gestureTrigger.bind(dispatcher);
+  scope.dispatcher = dispatcher;
+
+  /**
+   * Listen for `gesture` on `node` with the `handler` function
+   *
+   * If `handler` is the first listener for `gesture`, the underlying gesture recognizer is then enabled.
+   *
+   * @param {Element} node
+   * @param {string} gesture
+   * @return Boolean `gesture` is a valid gesture
+   */
+  scope.activateGesture = function(node, gesture) {
+    var g = gesture.toLowerCase();
+    var dep = dispatcher.dependencyMap[g];
+    if (dep) {
+      var recognizer = dispatcher.gestures[dep.index];
+      if (!node._pgListeners) {
+        dispatcher.register(node);
+        node._pgListeners = 0;
+      }
+      // TODO(dfreedm): re-evaluate bookkeeping to avoid using attributes
+      if (recognizer) {
+        var touchAction = recognizer.defaultActions && recognizer.defaultActions[g];
+        var actionNode;
+        switch(node.nodeType) {
+          case Node.ELEMENT_NODE:
+            actionNode = node;
+          break;
+          case Node.DOCUMENT_FRAGMENT_NODE:
+            actionNode = node.host;
+          break;
+          default:
+            actionNode = null;
+          break;
+        }
+        if (touchAction && actionNode && !actionNode.hasAttribute('touch-action')) {
+          actionNode.setAttribute('touch-action', touchAction);
+        }
+      }
+      if (!node._pgEvents) {
+        node._pgEvents = {};
+      }
+      node._pgEvents[g] = (node._pgEvents[g] || 0) + 1;
+      node._pgListeners++;
+    }
+    return Boolean(dep);
+  };
+
+  /**
+   *
+   * Listen for `gesture` from `node` with `handler` function.
+   *
+   * @param {Element} node
+   * @param {string} gesture
+   * @param {Function} handler
+   * @param {Boolean} capture
+   */
+  scope.addEventListener = function(node, gesture, handler, capture) {
+    if (handler) {
+      scope.activateGesture(node, gesture);
+      node.addEventListener(gesture, handler, capture);
+    }
+  };
+
+  /**
+   * Tears down the gesture configuration for `node`
+   *
+   * If `handler` is the last listener for `gesture`, the underlying gesture recognizer is disabled.
+   *
+   * @param {Element} node
+   * @param {string} gesture
+   * @return Boolean `gesture` is a valid gesture
+   */
+  scope.deactivateGesture = function(node, gesture) {
+    var g = gesture.toLowerCase();
+    var dep = dispatcher.dependencyMap[g];
+    if (dep) {
+      if (node._pgListeners > 0) {
+        node._pgListeners--;
+      }
+      if (node._pgListeners === 0) {
+        dispatcher.unregister(node);
+      }
+      if (node._pgEvents) {
+        if (node._pgEvents[g] > 0) {
+          node._pgEvents[g]--;
+        } else {
+          node._pgEvents[g] = 0;
+        }
+      }
+    }
+    return Boolean(dep);
+  };
+
+  /**
+   * Stop listening for `gesture` from `node` with `handler` function.
+   *
+   * @param {Element} node
+   * @param {string} gesture
+   * @param {Function} handler
+   * @param {Boolean} capture
+   */
+  scope.removeEventListener = function(node, gesture, handler, capture) {
+    if (handler) {
+      scope.deactivateGesture(node, gesture);
+      node.removeEventListener(gesture, handler, capture);
+    }
+  };
+})(window.PolymerGestures);
+
+(function (scope) {
+  var dispatcher = scope.dispatcher;
+  var pointermap = dispatcher.pointermap;
+  // radius around touchend that swallows mouse events
+  var DEDUP_DIST = 25;
+
+  var WHICH_TO_BUTTONS = [0, 1, 4, 2];
+
+  var CURRENT_BUTTONS = 0;
+  var HAS_BUTTONS = false;
+  try {
+    HAS_BUTTONS = new MouseEvent('test', {buttons: 1}).buttons === 1;
+  } catch (e) {}
+
+  // handler block for native mouse events
+  var mouseEvents = {
+    POINTER_ID: 1,
+    POINTER_TYPE: 'mouse',
+    events: [
+      'mousedown',
+      'mousemove',
+      'mouseup'
+    ],
+    exposes: [
+      'down',
+      'up',
+      'move'
+    ],
+    register: function(target) {
+      dispatcher.listen(target, this.events);
+    },
+    unregister: function(target) {
+      if (target === document) {
+        return;
+      }
+      dispatcher.unlisten(target, this.events);
+    },
+    lastTouches: [],
+    // collide with the global mouse listener
+    isEventSimulatedFromTouch: function(inEvent) {
+      var lts = this.lastTouches;
+      var x = inEvent.clientX, y = inEvent.clientY;
+      for (var i = 0, l = lts.length, t; i < l && (t = lts[i]); i++) {
+        // simulated mouse events will be swallowed near a primary touchend
+        var dx = Math.abs(x - t.x), dy = Math.abs(y - t.y);
+        if (dx <= DEDUP_DIST && dy <= DEDUP_DIST) {
+          return true;
+        }
+      }
+    },
+    prepareEvent: function(inEvent) {
+      var e = dispatcher.cloneEvent(inEvent);
+      e.pointerId = this.POINTER_ID;
+      e.isPrimary = true;
+      e.pointerType = this.POINTER_TYPE;
+      e._source = 'mouse';
+      if (!HAS_BUTTONS) {
+        var type = inEvent.type;
+        var bit = WHICH_TO_BUTTONS[inEvent.which] || 0;
+        if (type === 'mousedown') {
+          CURRENT_BUTTONS |= bit;
+        } else if (type === 'mouseup') {
+          CURRENT_BUTTONS &= ~bit;
+        }
+        e.buttons = CURRENT_BUTTONS;
+      }
+      return e;
+    },
+    mousedown: function(inEvent) {
+      if (!this.isEventSimulatedFromTouch(inEvent)) {
+        var p = pointermap.has(this.POINTER_ID);
+        var e = this.prepareEvent(inEvent);
+        e.target = scope.findTarget(inEvent);
+        pointermap.set(this.POINTER_ID, e.target);
+        dispatcher.down(e);
+      }
+    },
+    mousemove: function(inEvent) {
+      if (!this.isEventSimulatedFromTouch(inEvent)) {
+        var target = pointermap.get(this.POINTER_ID);
+        if (target) {
+          var e = this.prepareEvent(inEvent);
+          e.target = target;
+          // handle case where we missed a mouseup
+          if ((HAS_BUTTONS ? e.buttons : e.which) === 0) {
+            if (!HAS_BUTTONS) {
+              CURRENT_BUTTONS = e.buttons = 0;
+            }
+            dispatcher.cancel(e);
+            this.cleanupMouse(e.buttons);
+          } else {
+            dispatcher.move(e);
+          }
+        }
+      }
+    },
+    mouseup: function(inEvent) {
+      if (!this.isEventSimulatedFromTouch(inEvent)) {
+        var e = this.prepareEvent(inEvent);
+        e.relatedTarget = scope.findTarget(inEvent);
+        e.target = pointermap.get(this.POINTER_ID);
+        dispatcher.up(e);
+        this.cleanupMouse(e.buttons);
+      }
+    },
+    cleanupMouse: function(buttons) {
+      if (buttons === 0) {
+        pointermap.delete(this.POINTER_ID);
+      }
+    }
+  };
+
+  scope.mouseEvents = mouseEvents;
+})(window.PolymerGestures);
+
+(function(scope) {
+  var dispatcher = scope.dispatcher;
+  var allShadows = scope.targetFinding.allShadows.bind(scope.targetFinding);
+  var pointermap = dispatcher.pointermap;
+  var touchMap = Array.prototype.map.call.bind(Array.prototype.map);
+  // This should be long enough to ignore compat mouse events made by touch
+  var DEDUP_TIMEOUT = 2500;
+  var DEDUP_DIST = 25;
+  var CLICK_COUNT_TIMEOUT = 200;
+  var HYSTERESIS = 20;
+  var ATTRIB = 'touch-action';
+  // TODO(dfreedm): disable until http://crbug.com/399765 is resolved
+  // var HAS_TOUCH_ACTION = ATTRIB in document.head.style;
+  var HAS_TOUCH_ACTION = false;
+
+  // handler block for native touch events
+  var touchEvents = {
+    IS_IOS: false,
+    events: [
+      'touchstart',
+      'touchmove',
+      'touchend',
+      'touchcancel'
+    ],
+    exposes: [
+      'down',
+      'up',
+      'move'
+    ],
+    register: function(target, initial) {
+      if (this.IS_IOS ? initial : !initial) {
+        dispatcher.listen(target, this.events);
+      }
+    },
+    unregister: function(target) {
+      if (!this.IS_IOS) {
+        dispatcher.unlisten(target, this.events);
+      }
+    },
+    scrollTypes: {
+      EMITTER: 'none',
+      XSCROLLER: 'pan-x',
+      YSCROLLER: 'pan-y',
+    },
+    touchActionToScrollType: function(touchAction) {
+      var t = touchAction;
+      var st = this.scrollTypes;
+      if (t === st.EMITTER) {
+        return 'none';
+      } else if (t === st.XSCROLLER) {
+        return 'X';
+      } else if (t === st.YSCROLLER) {
+        return 'Y';
+      } else {
+        return 'XY';
+      }
+    },
+    POINTER_TYPE: 'touch',
+    firstTouch: null,
+    isPrimaryTouch: function(inTouch) {
+      return this.firstTouch === inTouch.identifier;
+    },
+    setPrimaryTouch: function(inTouch) {
+      // set primary touch if there no pointers, or the only pointer is the mouse
+      if (pointermap.pointers() === 0 || (pointermap.pointers() === 1 && pointermap.has(1))) {
+        this.firstTouch = inTouch.identifier;
+        this.firstXY = {X: inTouch.clientX, Y: inTouch.clientY};
+        this.firstTarget = inTouch.target;
+        this.scrolling = null;
+        this.cancelResetClickCount();
+      }
+    },
+    removePrimaryPointer: function(inPointer) {
+      if (inPointer.isPrimary) {
+        this.firstTouch = null;
+        this.firstXY = null;
+        this.resetClickCount();
+      }
+    },
+    clickCount: 0,
+    resetId: null,
+    resetClickCount: function() {
+      var fn = function() {
+        this.clickCount = 0;
+        this.resetId = null;
+      }.bind(this);
+      this.resetId = setTimeout(fn, CLICK_COUNT_TIMEOUT);
+    },
+    cancelResetClickCount: function() {
+      if (this.resetId) {
+        clearTimeout(this.resetId);
+      }
+    },
+    typeToButtons: function(type) {
+      var ret = 0;
+      if (type === 'touchstart' || type === 'touchmove') {
+        ret = 1;
+      }
+      return ret;
+    },
+    findTarget: function(touch, id) {
+      if (this.currentTouchEvent.type === 'touchstart') {
+        if (this.isPrimaryTouch(touch)) {
+          var fastPath = {
+            clientX: touch.clientX,
+            clientY: touch.clientY,
+            path: this.currentTouchEvent.path,
+            target: this.currentTouchEvent.target
+          };
+          return scope.findTarget(fastPath);
+        } else {
+          return scope.findTarget(touch);
+        }
+      }
+      // reuse target we found in touchstart
+      return pointermap.get(id);
+    },
+    touchToPointer: function(inTouch) {
+      var cte = this.currentTouchEvent;
+      var e = dispatcher.cloneEvent(inTouch);
+      // Spec specifies that pointerId 1 is reserved for Mouse.
+      // Touch identifiers can start at 0.
+      // Add 2 to the touch identifier for compatibility.
+      var id = e.pointerId = inTouch.identifier + 2;
+      e.target = this.findTarget(inTouch, id);
+      e.bubbles = true;
+      e.cancelable = true;
+      e.detail = this.clickCount;
+      e.buttons = this.typeToButtons(cte.type);
+      e.width = inTouch.webkitRadiusX || inTouch.radiusX || 0;
+      e.height = inTouch.webkitRadiusY || inTouch.radiusY || 0;
+      e.pressure = inTouch.webkitForce || inTouch.force || 0.5;
+      e.isPrimary = this.isPrimaryTouch(inTouch);
+      e.pointerType = this.POINTER_TYPE;
+      e._source = 'touch';
+      // forward touch preventDefaults
+      var self = this;
+      e.preventDefault = function() {
+        self.scrolling = false;
+        self.firstXY = null;
+        cte.preventDefault();
+      };
+      return e;
+    },
+    processTouches: function(inEvent, inFunction) {
+      var tl = inEvent.changedTouches;
+      this.currentTouchEvent = inEvent;
+      for (var i = 0, t, p; i < tl.length; i++) {
+        t = tl[i];
+        p = this.touchToPointer(t);
+        if (inEvent.type === 'touchstart') {
+          pointermap.set(p.pointerId, p.target);
+        }
+        if (pointermap.has(p.pointerId)) {
+          inFunction.call(this, p);
+        }
+        if (inEvent.type === 'touchend' || inEvent._cancel) {
+          this.cleanUpPointer(p);
+        }
+      }
+    },
+    // For single axis scrollers, determines whether the element should emit
+    // pointer events or behave as a scroller
+    shouldScroll: function(inEvent) {
+      if (this.firstXY) {
+        var ret;
+        var touchAction = scope.targetFinding.findTouchAction(inEvent);
+        var scrollAxis = this.touchActionToScrollType(touchAction);
+        if (scrollAxis === 'none') {
+          // this element is a touch-action: none, should never scroll
+          ret = false;
+        } else if (scrollAxis === 'XY') {
+          // this element should always scroll
+          ret = true;
+        } else {
+          var t = inEvent.changedTouches[0];
+          // check the intended scroll axis, and other axis
+          var a = scrollAxis;
+          var oa = scrollAxis === 'Y' ? 'X' : 'Y';
+          var da = Math.abs(t['client' + a] - this.firstXY[a]);
+          var doa = Math.abs(t['client' + oa] - this.firstXY[oa]);
+          // if delta in the scroll axis > delta other axis, scroll instead of
+          // making events
+          ret = da >= doa;
+        }
+        return ret;
+      }
+    },
+    findTouch: function(inTL, inId) {
+      for (var i = 0, l = inTL.length, t; i < l && (t = inTL[i]); i++) {
+        if (t.identifier === inId) {
+          return true;
+        }
+      }
+    },
+    // In some instances, a touchstart can happen without a touchend. This
+    // leaves the pointermap in a broken state.
+    // Therefore, on every touchstart, we remove the touches that did not fire a
+    // touchend event.
+    // To keep state globally consistent, we fire a
+    // pointercancel for this "abandoned" touch
+    vacuumTouches: function(inEvent) {
+      var tl = inEvent.touches;
+      // pointermap.pointers() should be < tl.length here, as the touchstart has not
+      // been processed yet.
+      if (pointermap.pointers() >= tl.length) {
+        var d = [];
+        pointermap.forEach(function(value, key) {
+          // Never remove pointerId == 1, which is mouse.
+          // Touch identifiers are 2 smaller than their pointerId, which is the
+          // index in pointermap.
+          if (key !== 1 && !this.findTouch(tl, key - 2)) {
+            var p = value;
+            d.push(p);
+          }
+        }, this);
+        d.forEach(function(p) {
+          this.cancel(p);
+          pointermap.delete(p.pointerId);
+        });
+      }
+    },
+    touchstart: function(inEvent) {
+      this.vacuumTouches(inEvent);
+      this.setPrimaryTouch(inEvent.changedTouches[0]);
+      this.dedupSynthMouse(inEvent);
+      if (!this.scrolling) {
+        this.clickCount++;
+        this.processTouches(inEvent, this.down);
+      }
+    },
+    down: function(inPointer) {
+      dispatcher.down(inPointer);
+    },
+    touchmove: function(inEvent) {
+      if (HAS_TOUCH_ACTION) {
+        // touchevent.cancelable == false is sent when the page is scrolling under native Touch Action in Chrome 36
+        // https://groups.google.com/a/chromium.org/d/msg/input-dev/wHnyukcYBcA/b9kmtwM1jJQJ
+        if (inEvent.cancelable) {
+          this.processTouches(inEvent, this.move);
+        }
+      } else {
+        if (!this.scrolling) {
+          if (this.scrolling === null && this.shouldScroll(inEvent)) {
+            this.scrolling = true;
+          } else {
+            this.scrolling = false;
+            inEvent.preventDefault();
+            this.processTouches(inEvent, this.move);
+          }
+        } else if (this.firstXY) {
+          var t = inEvent.changedTouches[0];
+          var dx = t.clientX - this.firstXY.X;
+          var dy = t.clientY - this.firstXY.Y;
+          var dd = Math.sqrt(dx * dx + dy * dy);
+          if (dd >= HYSTERESIS) {
+            this.touchcancel(inEvent);
+            this.scrolling = true;
+            this.firstXY = null;
+          }
+        }
+      }
+    },
+    move: function(inPointer) {
+      dispatcher.move(inPointer);
+    },
+    touchend: function(inEvent) {
+      this.dedupSynthMouse(inEvent);
+      this.processTouches(inEvent, this.up);
+    },
+    up: function(inPointer) {
+      inPointer.relatedTarget = scope.findTarget(inPointer);
+      dispatcher.up(inPointer);
+    },
+    cancel: function(inPointer) {
+      dispatcher.cancel(inPointer);
+    },
+    touchcancel: function(inEvent) {
+      inEvent._cancel = true;
+      this.processTouches(inEvent, this.cancel);
+    },
+    cleanUpPointer: function(inPointer) {
+      pointermap['delete'](inPointer.pointerId);
+      this.removePrimaryPointer(inPointer);
+    },
+    // prevent synth mouse events from creating pointer events
+    dedupSynthMouse: function(inEvent) {
+      var lts = scope.mouseEvents.lastTouches;
+      var t = inEvent.changedTouches[0];
+      // only the primary finger will synth mouse events
+      if (this.isPrimaryTouch(t)) {
+        // remember x/y of last touch
+        var lt = {x: t.clientX, y: t.clientY};
+        lts.push(lt);
+        var fn = (function(lts, lt){
+          var i = lts.indexOf(lt);
+          if (i > -1) {
+            lts.splice(i, 1);
+          }
+        }).bind(null, lts, lt);
+        setTimeout(fn, DEDUP_TIMEOUT);
+      }
+    }
+  };
+
+  // prevent "ghost clicks" that come from elements that were removed in a touch handler
+  var STOP_PROP_FN = Event.prototype.stopImmediatePropagation || Event.prototype.stopPropagation;
+  document.addEventListener('click', function(ev) {
+    var x = ev.clientX, y = ev.clientY;
+    // check if a click is within DEDUP_DIST px radius of the touchstart
+    var closeTo = function(touch) {
+      var dx = Math.abs(x - touch.x), dy = Math.abs(y - touch.y);
+      return (dx <= DEDUP_DIST && dy <= DEDUP_DIST);
+    };
+    // if click coordinates are close to touch coordinates, assume the click came from a touch
+    var wasTouched = scope.mouseEvents.lastTouches.some(closeTo);
+    // if the click came from touch, and the touchstart target is not in the path of the click event,
+    // then the touchstart target was probably removed, and the click should be "busted"
+    var path = scope.targetFinding.path(ev);
+    if (wasTouched) {
+      for (var i = 0; i < path.length; i++) {
+        if (path[i] === touchEvents.firstTarget) {
+          return;
+        }
+      }
+      ev.preventDefault();
+      STOP_PROP_FN.call(ev);
+    }
+  }, true);
+
+  scope.touchEvents = touchEvents;
+})(window.PolymerGestures);
+
+(function(scope) {
+  var dispatcher = scope.dispatcher;
+  var pointermap = dispatcher.pointermap;
+  var HAS_BITMAP_TYPE = window.MSPointerEvent && typeof window.MSPointerEvent.MSPOINTER_TYPE_MOUSE === 'number';
+  var msEvents = {
+    events: [
+      'MSPointerDown',
+      'MSPointerMove',
+      'MSPointerUp',
+      'MSPointerCancel',
+    ],
+    register: function(target) {
+      dispatcher.listen(target, this.events);
+    },
+    unregister: function(target) {
+      if (target === document) {
+        return;
+      }
+      dispatcher.unlisten(target, this.events);
+    },
+    POINTER_TYPES: [
+      '',
+      'unavailable',
+      'touch',
+      'pen',
+      'mouse'
+    ],
+    prepareEvent: function(inEvent) {
+      var e = inEvent;
+      e = dispatcher.cloneEvent(inEvent);
+      if (HAS_BITMAP_TYPE) {
+        e.pointerType = this.POINTER_TYPES[inEvent.pointerType];
+      }
+      e._source = 'ms';
+      return e;
+    },
+    cleanup: function(id) {
+      pointermap['delete'](id);
+    },
+    MSPointerDown: function(inEvent) {
+      var e = this.prepareEvent(inEvent);
+      e.target = scope.findTarget(inEvent);
+      pointermap.set(inEvent.pointerId, e.target);
+      dispatcher.down(e);
+    },
+    MSPointerMove: function(inEvent) {
+      var target = pointermap.get(inEvent.pointerId);
+      if (target) {
+        var e = this.prepareEvent(inEvent);
+        e.target = target;
+        dispatcher.move(e);
+      }
+    },
+    MSPointerUp: function(inEvent) {
+      var e = this.prepareEvent(inEvent);
+      e.relatedTarget = scope.findTarget(inEvent);
+      e.target = pointermap.get(e.pointerId);
+      dispatcher.up(e);
+      this.cleanup(inEvent.pointerId);
+    },
+    MSPointerCancel: function(inEvent) {
+      var e = this.prepareEvent(inEvent);
+      e.relatedTarget = scope.findTarget(inEvent);
+      e.target = pointermap.get(e.pointerId);
+      dispatcher.cancel(e);
+      this.cleanup(inEvent.pointerId);
+    }
+  };
+
+  scope.msEvents = msEvents;
+})(window.PolymerGestures);
+
+(function(scope) {
+  var dispatcher = scope.dispatcher;
+  var pointermap = dispatcher.pointermap;
+  var pointerEvents = {
+    events: [
+      'pointerdown',
+      'pointermove',
+      'pointerup',
+      'pointercancel'
+    ],
+    prepareEvent: function(inEvent) {
+      var e = dispatcher.cloneEvent(inEvent);
+      e._source = 'pointer';
+      return e;
+    },
+    register: function(target) {
+      dispatcher.listen(target, this.events);
+    },
+    unregister: function(target) {
+      if (target === document) {
+        return;
+      }
+      dispatcher.unlisten(target, this.events);
+    },
+    cleanup: function(id) {
+      pointermap['delete'](id);
+    },
+    pointerdown: function(inEvent) {
+      var e = this.prepareEvent(inEvent);
+      e.target = scope.findTarget(inEvent);
+      pointermap.set(e.pointerId, e.target);
+      dispatcher.down(e);
+    },
+    pointermove: function(inEvent) {
+      var target = pointermap.get(inEvent.pointerId);
+      if (target) {
+        var e = this.prepareEvent(inEvent);
+        e.target = target;
+        dispatcher.move(e);
+      }
+    },
+    pointerup: function(inEvent) {
+      var e = this.prepareEvent(inEvent);
+      e.relatedTarget = scope.findTarget(inEvent);
+      e.target = pointermap.get(e.pointerId);
+      dispatcher.up(e);
+      this.cleanup(inEvent.pointerId);
+    },
+    pointercancel: function(inEvent) {
+      var e = this.prepareEvent(inEvent);
+      e.relatedTarget = scope.findTarget(inEvent);
+      e.target = pointermap.get(e.pointerId);
+      dispatcher.cancel(e);
+      this.cleanup(inEvent.pointerId);
+    }
+  };
+
+  scope.pointerEvents = pointerEvents;
+})(window.PolymerGestures);
+
+/**
+ * This module contains the handlers for native platform events.
+ * From here, the dispatcher is called to create unified pointer events.
+ * Included are touch events (v1), mouse events, and MSPointerEvents.
+ */
+(function(scope) {
+
+  var dispatcher = scope.dispatcher;
+  var nav = window.navigator;
+
+  if (window.PointerEvent) {
+    dispatcher.registerSource('pointer', scope.pointerEvents);
+  } else if (nav.msPointerEnabled) {
+    dispatcher.registerSource('ms', scope.msEvents);
+  } else {
+    dispatcher.registerSource('mouse', scope.mouseEvents);
+    if (window.ontouchstart !== undefined) {
+      dispatcher.registerSource('touch', scope.touchEvents);
+    }
+  }
+
+  // Work around iOS bugs https://bugs.webkit.org/show_bug.cgi?id=135628 and https://bugs.webkit.org/show_bug.cgi?id=136506
+  var ua = navigator.userAgent;
+  var IS_IOS = ua.match(/iPad|iPhone|iPod/) && 'ontouchstart' in window;
+
+  dispatcher.IS_IOS = IS_IOS;
+  scope.touchEvents.IS_IOS = IS_IOS;
+
+  dispatcher.register(document, true);
+})(window.PolymerGestures);
+
+/**
+ * This event denotes the beginning of a series of tracking events.
+ *
+ * @module PointerGestures
+ * @submodule Events
+ * @class trackstart
+ */
+/**
+ * Pixels moved in the x direction since trackstart.
+ * @type Number
+ * @property dx
+ */
+/**
+ * Pixes moved in the y direction since trackstart.
+ * @type Number
+ * @property dy
+ */
+/**
+ * Pixels moved in the x direction since the last track.
+ * @type Number
+ * @property ddx
+ */
+/**
+ * Pixles moved in the y direction since the last track.
+ * @type Number
+ * @property ddy
+ */
+/**
+ * The clientX position of the track gesture.
+ * @type Number
+ * @property clientX
+ */
+/**
+ * The clientY position of the track gesture.
+ * @type Number
+ * @property clientY
+ */
+/**
+ * The pageX position of the track gesture.
+ * @type Number
+ * @property pageX
+ */
+/**
+ * The pageY position of the track gesture.
+ * @type Number
+ * @property pageY
+ */
+/**
+ * The screenX position of the track gesture.
+ * @type Number
+ * @property screenX
+ */
+/**
+ * The screenY position of the track gesture.
+ * @type Number
+ * @property screenY
+ */
+/**
+ * The last x axis direction of the pointer.
+ * @type Number
+ * @property xDirection
+ */
+/**
+ * The last y axis direction of the pointer.
+ * @type Number
+ * @property yDirection
+ */
+/**
+ * A shared object between all tracking events.
+ * @type Object
+ * @property trackInfo
+ */
+/**
+ * The element currently under the pointer.
+ * @type Element
+ * @property relatedTarget
+ */
+/**
+ * The type of pointer that make the track gesture.
+ * @type String
+ * @property pointerType
+ */
+/**
+ *
+ * This event fires for all pointer movement being tracked.
+ *
+ * @class track
+ * @extends trackstart
+ */
+/**
+ * This event fires when the pointer is no longer being tracked.
+ *
+ * @class trackend
+ * @extends trackstart
+ */
+
+ (function(scope) {
+   var dispatcher = scope.dispatcher;
+   var eventFactory = scope.eventFactory;
+   var pointermap = new scope.PointerMap();
+   var track = {
+     events: [
+       'down',
+       'move',
+       'up',
+     ],
+     exposes: [
+      'trackstart',
+      'track',
+      'trackx',
+      'tracky',
+      'trackend'
+     ],
+     defaultActions: {
+       'track': 'none',
+       'trackx': 'pan-y',
+       'tracky': 'pan-x'
+     },
+     WIGGLE_THRESHOLD: 4,
+     clampDir: function(inDelta) {
+       return inDelta > 0 ? 1 : -1;
+     },
+     calcPositionDelta: function(inA, inB) {
+       var x = 0, y = 0;
+       if (inA && inB) {
+         x = inB.pageX - inA.pageX;
+         y = inB.pageY - inA.pageY;
+       }
+       return {x: x, y: y};
+     },
+     fireTrack: function(inType, inEvent, inTrackingData) {
+       var t = inTrackingData;
+       var d = this.calcPositionDelta(t.downEvent, inEvent);
+       var dd = this.calcPositionDelta(t.lastMoveEvent, inEvent);
+       if (dd.x) {
+         t.xDirection = this.clampDir(dd.x);
+       } else if (inType === 'trackx') {
+         return;
+       }
+       if (dd.y) {
+         t.yDirection = this.clampDir(dd.y);
+       } else if (inType === 'tracky') {
+         return;
+       }
+       var gestureProto = {
+         bubbles: true,
+         cancelable: true,
+         trackInfo: t.trackInfo,
+         relatedTarget: inEvent.relatedTarget,
+         pointerType: inEvent.pointerType,
+         pointerId: inEvent.pointerId,
+         _source: 'track'
+       };
+       if (inType !== 'tracky') {
+         gestureProto.x = inEvent.x;
+         gestureProto.dx = d.x;
+         gestureProto.ddx = dd.x;
+         gestureProto.clientX = inEvent.clientX;
+         gestureProto.pageX = inEvent.pageX;
+         gestureProto.screenX = inEvent.screenX;
+         gestureProto.xDirection = t.xDirection;
+       }
+       if (inType !== 'trackx') {
+         gestureProto.dy = d.y;
+         gestureProto.ddy = dd.y;
+         gestureProto.y = inEvent.y;
+         gestureProto.clientY = inEvent.clientY;
+         gestureProto.pageY = inEvent.pageY;
+         gestureProto.screenY = inEvent.screenY;
+         gestureProto.yDirection = t.yDirection;
+       }
+       var e = eventFactory.makeGestureEvent(inType, gestureProto);
+       t.downTarget.dispatchEvent(e);
+     },
+     down: function(inEvent) {
+       if (inEvent.isPrimary && (inEvent.pointerType === 'mouse' ? inEvent.buttons === 1 : true)) {
+         var p = {
+           downEvent: inEvent,
+           downTarget: inEvent.target,
+           trackInfo: {},
+           lastMoveEvent: null,
+           xDirection: 0,
+           yDirection: 0,
+           tracking: false
+         };
+         pointermap.set(inEvent.pointerId, p);
+       }
+     },
+     move: function(inEvent) {
+       var p = pointermap.get(inEvent.pointerId);
+       if (p) {
+         if (!p.tracking) {
+           var d = this.calcPositionDelta(p.downEvent, inEvent);
+           var move = d.x * d.x + d.y * d.y;
+           // start tracking only if finger moves more than WIGGLE_THRESHOLD
+           if (move > this.WIGGLE_THRESHOLD) {
+             p.tracking = true;
+             p.lastMoveEvent = p.downEvent;
+             this.fireTrack('trackstart', inEvent, p);
+           }
+         }
+         if (p.tracking) {
+           this.fireTrack('track', inEvent, p);
+           this.fireTrack('trackx', inEvent, p);
+           this.fireTrack('tracky', inEvent, p);
+         }
+         p.lastMoveEvent = inEvent;
+       }
+     },
+     up: function(inEvent) {
+       var p = pointermap.get(inEvent.pointerId);
+       if (p) {
+         if (p.tracking) {
+           this.fireTrack('trackend', inEvent, p);
+         }
+         pointermap.delete(inEvent.pointerId);
+       }
+     }
+   };
+   dispatcher.registerGesture('track', track);
+ })(window.PolymerGestures);
+
+/**
+ * This event is fired when a pointer is held down for 200ms.
+ *
+ * @module PointerGestures
+ * @submodule Events
+ * @class hold
+ */
+/**
+ * Type of pointer that made the holding event.
+ * @type String
+ * @property pointerType
+ */
+/**
+ * Screen X axis position of the held pointer
+ * @type Number
+ * @property clientX
+ */
+/**
+ * Screen Y axis position of the held pointer
+ * @type Number
+ * @property clientY
+ */
+/**
+ * Type of pointer that made the holding event.
+ * @type String
+ * @property pointerType
+ */
+/**
+ * This event is fired every 200ms while a pointer is held down.
+ *
+ * @class holdpulse
+ * @extends hold
+ */
+/**
+ * Milliseconds pointer has been held down.
+ * @type Number
+ * @property holdTime
+ */
+/**
+ * This event is fired when a held pointer is released or moved.
+ *
+ * @class release
+ */
+
+(function(scope) {
+  var dispatcher = scope.dispatcher;
+  var eventFactory = scope.eventFactory;
+  var hold = {
+    // wait at least HOLD_DELAY ms between hold and pulse events
+    HOLD_DELAY: 200,
+    // pointer can move WIGGLE_THRESHOLD pixels before not counting as a hold
+    WIGGLE_THRESHOLD: 16,
+    events: [
+      'down',
+      'move',
+      'up',
+    ],
+    exposes: [
+      'hold',
+      'holdpulse',
+      'release'
+    ],
+    heldPointer: null,
+    holdJob: null,
+    pulse: function() {
+      var hold = Date.now() - this.heldPointer.timeStamp;
+      var type = this.held ? 'holdpulse' : 'hold';
+      this.fireHold(type, hold);
+      this.held = true;
+    },
+    cancel: function() {
+      clearInterval(this.holdJob);
+      if (this.held) {
+        this.fireHold('release');
+      }
+      this.held = false;
+      this.heldPointer = null;
+      this.target = null;
+      this.holdJob = null;
+    },
+    down: function(inEvent) {
+      if (inEvent.isPrimary && !this.heldPointer) {
+        this.heldPointer = inEvent;
+        this.target = inEvent.target;
+        this.holdJob = setInterval(this.pulse.bind(this), this.HOLD_DELAY);
+      }
+    },
+    up: function(inEvent) {
+      if (this.heldPointer && this.heldPointer.pointerId === inEvent.pointerId) {
+        this.cancel();
+      }
+    },
+    move: function(inEvent) {
+      if (this.heldPointer && this.heldPointer.pointerId === inEvent.pointerId) {
+        var x = inEvent.clientX - this.heldPointer.clientX;
+        var y = inEvent.clientY - this.heldPointer.clientY;
+        if ((x * x + y * y) > this.WIGGLE_THRESHOLD) {
+          this.cancel();
+        }
+      }
+    },
+    fireHold: function(inType, inHoldTime) {
+      var p = {
+        bubbles: true,
+        cancelable: true,
+        pointerType: this.heldPointer.pointerType,
+        pointerId: this.heldPointer.pointerId,
+        x: this.heldPointer.clientX,
+        y: this.heldPointer.clientY,
+        _source: 'hold'
+      };
+      if (inHoldTime) {
+        p.holdTime = inHoldTime;
+      }
+      var e = eventFactory.makeGestureEvent(inType, p);
+      this.target.dispatchEvent(e);
+    }
+  };
+  dispatcher.registerGesture('hold', hold);
+})(window.PolymerGestures);
+
+/**
+ * This event is fired when a pointer quickly goes down and up, and is used to
+ * denote activation.
+ *
+ * Any gesture event can prevent the tap event from being created by calling
+ * `event.preventTap`.
+ *
+ * Any pointer event can prevent the tap by setting the `tapPrevented` property
+ * on itself.
+ *
+ * @module PointerGestures
+ * @submodule Events
+ * @class tap
+ */
+/**
+ * X axis position of the tap.
+ * @property x
+ * @type Number
+ */
+/**
+ * Y axis position of the tap.
+ * @property y
+ * @type Number
+ */
+/**
+ * Type of the pointer that made the tap.
+ * @property pointerType
+ * @type String
+ */
+(function(scope) {
+  var dispatcher = scope.dispatcher;
+  var eventFactory = scope.eventFactory;
+  var pointermap = new scope.PointerMap();
+  var tap = {
+    events: [
+      'down',
+      'up'
+    ],
+    exposes: [
+      'tap'
+    ],
+    down: function(inEvent) {
+      if (inEvent.isPrimary && !inEvent.tapPrevented) {
+        pointermap.set(inEvent.pointerId, {
+          target: inEvent.target,
+          buttons: inEvent.buttons,
+          x: inEvent.clientX,
+          y: inEvent.clientY
+        });
+      }
+    },
+    shouldTap: function(e, downState) {
+      var tap = true;
+      if (e.pointerType === 'mouse') {
+        // only allow left click to tap for mouse
+        tap = (e.buttons ^ 1) && (downState.buttons & 1);
+      }
+      return tap && !e.tapPrevented;
+    },
+    up: function(inEvent) {
+      var start = pointermap.get(inEvent.pointerId);
+      if (start && this.shouldTap(inEvent, start)) {
+        // up.relatedTarget is target currently under finger
+        var t = scope.targetFinding.LCA(start.target, inEvent.relatedTarget);
+        if (t) {
+          var e = eventFactory.makeGestureEvent('tap', {
+            bubbles: true,
+            cancelable: true,
+            x: inEvent.clientX,
+            y: inEvent.clientY,
+            detail: inEvent.detail,
+            pointerType: inEvent.pointerType,
+            pointerId: inEvent.pointerId,
+            altKey: inEvent.altKey,
+            ctrlKey: inEvent.ctrlKey,
+            metaKey: inEvent.metaKey,
+            shiftKey: inEvent.shiftKey,
+            _source: 'tap'
+          });
+          t.dispatchEvent(e);
+        }
+      }
+      pointermap.delete(inEvent.pointerId);
+    }
+  };
+  // patch eventFactory to remove id from tap's pointermap for preventTap calls
+  eventFactory.preventTap = function(e) {
+    return function() {
+      e.tapPrevented = true;
+      pointermap.delete(e.pointerId);
+    };
+  };
+  dispatcher.registerGesture('tap', tap);
+})(window.PolymerGestures);
+
+/*
+ * Basic strategy: find the farthest apart points, use as diameter of circle
+ * react to size change and rotation of the chord
+ */
+
+/**
+ * @module pointer-gestures
+ * @submodule Events
+ * @class pinch
+ */
+/**
+ * Scale of the pinch zoom gesture
+ * @property scale
+ * @type Number
+ */
+/**
+ * Center X position of pointers causing pinch
+ * @property centerX
+ * @type Number
+ */
+/**
+ * Center Y position of pointers causing pinch
+ * @property centerY
+ * @type Number
+ */
+
+/**
+ * @module pointer-gestures
+ * @submodule Events
+ * @class rotate
+ */
+/**
+ * Angle (in degrees) of rotation. Measured from starting positions of pointers.
+ * @property angle
+ * @type Number
+ */
+/**
+ * Center X position of pointers causing rotation
+ * @property centerX
+ * @type Number
+ */
+/**
+ * Center Y position of pointers causing rotation
+ * @property centerY
+ * @type Number
+ */
+(function(scope) {
+  var dispatcher = scope.dispatcher;
+  var eventFactory = scope.eventFactory;
+  var pointermap = new scope.PointerMap();
+  var RAD_TO_DEG = 180 / Math.PI;
+  var pinch = {
+    events: [
+      'down',
+      'up',
+      'move',
+      'cancel'
+    ],
+    exposes: [
+      'pinch',
+      'rotate'
+    ],
+    defaultActions: {
+      'pinch': 'none',
+      'rotate': 'none'
+    },
+    reference: {},
+    down: function(inEvent) {
+      pointermap.set(inEvent.pointerId, inEvent);
+      if (pointermap.pointers() == 2) {
+        var points = this.calcChord();
+        var angle = this.calcAngle(points);
+        this.reference = {
+          angle: angle,
+          diameter: points.diameter,
+          target: scope.targetFinding.LCA(points.a.target, points.b.target)
+        };
+      }
+    },
+    up: function(inEvent) {
+      var p = pointermap.get(inEvent.pointerId);
+      if (p) {
+        pointermap.delete(inEvent.pointerId);
+      }
+    },
+    move: function(inEvent) {
+      if (pointermap.has(inEvent.pointerId)) {
+        pointermap.set(inEvent.pointerId, inEvent);
+        if (pointermap.pointers() > 1) {
+          this.calcPinchRotate();
+        }
+      }
+    },
+    cancel: function(inEvent) {
+        this.up(inEvent);
+    },
+    firePinch: function(diameter, points) {
+      var zoom = diameter / this.reference.diameter;
+      var e = eventFactory.makeGestureEvent('pinch', {
+        bubbles: true,
+        cancelable: true,
+        scale: zoom,
+        centerX: points.center.x,
+        centerY: points.center.y,
+        _source: 'pinch'
+      });
+      this.reference.target.dispatchEvent(e);
+    },
+    fireRotate: function(angle, points) {
+      var diff = Math.round((angle - this.reference.angle) % 360);
+      var e = eventFactory.makeGestureEvent('rotate', {
+        bubbles: true,
+        cancelable: true,
+        angle: diff,
+        centerX: points.center.x,
+        centerY: points.center.y,
+        _source: 'pinch'
+      });
+      this.reference.target.dispatchEvent(e);
+    },
+    calcPinchRotate: function() {
+      var points = this.calcChord();
+      var diameter = points.diameter;
+      var angle = this.calcAngle(points);
+      if (diameter != this.reference.diameter) {
+        this.firePinch(diameter, points);
+      }
+      if (angle != this.reference.angle) {
+        this.fireRotate(angle, points);
+      }
+    },
+    calcChord: function() {
+      var pointers = [];
+      pointermap.forEach(function(p) {
+        pointers.push(p);
+      });
+      var dist = 0;
+      // start with at least two pointers
+      var points = {a: pointers[0], b: pointers[1]};
+      var x, y, d;
+      for (var i = 0; i < pointers.length; i++) {
+        var a = pointers[i];
+        for (var j = i + 1; j < pointers.length; j++) {
+          var b = pointers[j];
+          x = Math.abs(a.clientX - b.clientX);
+          y = Math.abs(a.clientY - b.clientY);
+          d = x + y;
+          if (d > dist) {
+            dist = d;
+            points = {a: a, b: b};
+          }
+        }
+      }
+      x = Math.abs(points.a.clientX + points.b.clientX) / 2;
+      y = Math.abs(points.a.clientY + points.b.clientY) / 2;
+      points.center = { x: x, y: y };
+      points.diameter = dist;
+      return points;
+    },
+    calcAngle: function(points) {
+      var x = points.a.clientX - points.b.clientX;
+      var y = points.a.clientY - points.b.clientY;
+      return (360 + Math.atan2(y, x) * RAD_TO_DEG) % 360;
+    }
+  };
+  dispatcher.registerGesture('pinch', pinch);
+})(window.PolymerGestures);
+
+(function (global) {
+    'use strict';
+
+    var Token,
+        TokenName,
+        Syntax,
+        Messages,
+        source,
+        index,
+        length,
+        delegate,
+        lookahead,
+        state;
+
+    Token = {
+        BooleanLiteral: 1,
+        EOF: 2,
+        Identifier: 3,
+        Keyword: 4,
+        NullLiteral: 5,
+        NumericLiteral: 6,
+        Punctuator: 7,
+        StringLiteral: 8
+    };
+
+    TokenName = {};
+    TokenName[Token.BooleanLiteral] = 'Boolean';
+    TokenName[Token.EOF] = '<end>';
+    TokenName[Token.Identifier] = 'Identifier';
+    TokenName[Token.Keyword] = 'Keyword';
+    TokenName[Token.NullLiteral] = 'Null';
+    TokenName[Token.NumericLiteral] = 'Numeric';
+    TokenName[Token.Punctuator] = 'Punctuator';
+    TokenName[Token.StringLiteral] = 'String';
+
+    Syntax = {
+        ArrayExpression: 'ArrayExpression',
+        BinaryExpression: 'BinaryExpression',
+        CallExpression: 'CallExpression',
+        ConditionalExpression: 'ConditionalExpression',
+        EmptyStatement: 'EmptyStatement',
+        ExpressionStatement: 'ExpressionStatement',
+        Identifier: 'Identifier',
+        Literal: 'Literal',
+        LabeledStatement: 'LabeledStatement',
+        LogicalExpression: 'LogicalExpression',
+        MemberExpression: 'MemberExpression',
+        ObjectExpression: 'ObjectExpression',
+        Program: 'Program',
+        Property: 'Property',
+        ThisExpression: 'ThisExpression',
+        UnaryExpression: 'UnaryExpression'
+    };
+
+    // Error messages should be identical to V8.
+    Messages = {
+        UnexpectedToken:  'Unexpected token %0',
+        UnknownLabel: 'Undefined label \'%0\'',
+        Redeclaration: '%0 \'%1\' has already been declared'
+    };
+
+    // Ensure the condition is true, otherwise throw an error.
+    // This is only to have a better contract semantic, i.e. another safety net
+    // to catch a logic error. The condition shall be fulfilled in normal case.
+    // Do NOT use this to enforce a certain condition on any user input.
+
+    function assert(condition, message) {
+        if (!condition) {
+            throw new Error('ASSERT: ' + message);
+        }
+    }
+
+    function isDecimalDigit(ch) {
+        return (ch >= 48 && ch <= 57);   // 0..9
+    }
+
+
+    // 7.2 White Space
+
+    function isWhiteSpace(ch) {
+        return (ch === 32) ||  // space
+            (ch === 9) ||      // tab
+            (ch === 0xB) ||
+            (ch === 0xC) ||
+            (ch === 0xA0) ||
+            (ch >= 0x1680 && '\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\uFEFF'.indexOf(String.fromCharCode(ch)) > 0);
+    }
+
+    // 7.3 Line Terminators
+
+    function isLineTerminator(ch) {
+        return (ch === 10) || (ch === 13) || (ch === 0x2028) || (ch === 0x2029);
+    }
+
+    // 7.6 Identifier Names and Identifiers
+
+    function isIdentifierStart(ch) {
+        return (ch === 36) || (ch === 95) ||  // $ (dollar) and _ (underscore)
+            (ch >= 65 && ch <= 90) ||         // A..Z
+            (ch >= 97 && ch <= 122);          // a..z
+    }
+
+    function isIdentifierPart(ch) {
+        return (ch === 36) || (ch === 95) ||  // $ (dollar) and _ (underscore)
+            (ch >= 65 && ch <= 90) ||         // A..Z
+            (ch >= 97 && ch <= 122) ||        // a..z
+            (ch >= 48 && ch <= 57);           // 0..9
+    }
+
+    // 7.6.1.1 Keywords
+
+    function isKeyword(id) {
+        return (id === 'this')
+    }
+
+    // 7.4 Comments
+
+    function skipWhitespace() {
+        while (index < length && isWhiteSpace(source.charCodeAt(index))) {
+           ++index;
+        }
+    }
+
+    function getIdentifier() {
+        var start, ch;
+
+        start = index++;
+        while (index < length) {
+            ch = source.charCodeAt(index);
+            if (isIdentifierPart(ch)) {
+                ++index;
+            } else {
+                break;
+            }
+        }
+
+        return source.slice(start, index);
+    }
+
+    function scanIdentifier() {
+        var start, id, type;
+
+        start = index;
+
+        id = getIdentifier();
+
+        // There is no keyword or literal with only one character.
+        // Thus, it must be an identifier.
+        if (id.length === 1) {
+            type = Token.Identifier;
+        } else if (isKeyword(id)) {
+            type = Token.Keyword;
+        } else if (id === 'null') {
+            type = Token.NullLiteral;
+        } else if (id === 'true' || id === 'false') {
+            type = Token.BooleanLiteral;
+        } else {
+            type = Token.Identifier;
+        }
+
+        return {
+            type: type,
+            value: id,
+            range: [start, index]
+        };
+    }
+
+
+    // 7.7 Punctuators
+
+    function scanPunctuator() {
+        var start = index,
+            code = source.charCodeAt(index),
+            code2,
+            ch1 = source[index],
+            ch2;
+
+        switch (code) {
+
+        // Check for most common single-character punctuators.
+        case 46:   // . dot
+        case 40:   // ( open bracket
+        case 41:   // ) close bracket
+        case 59:   // ; semicolon
+        case 44:   // , comma
+        case 123:  // { open curly brace
+        case 125:  // } close curly brace
+        case 91:   // [
+        case 93:   // ]
+        case 58:   // :
+        case 63:   // ?
+            ++index;
+            return {
+                type: Token.Punctuator,
+                value: String.fromCharCode(code),
+                range: [start, index]
+            };
+
+        default:
+            code2 = source.charCodeAt(index + 1);
+
+            // '=' (char #61) marks an assignment or comparison operator.
+            if (code2 === 61) {
+                switch (code) {
+                case 37:  // %
+                case 38:  // &
+                case 42:  // *:
+                case 43:  // +
+                case 45:  // -
+                case 47:  // /
+                case 60:  // <
+                case 62:  // >
+                case 124: // |
+                    index += 2;
+                    return {
+                        type: Token.Punctuator,
+                        value: String.fromCharCode(code) + String.fromCharCode(code2),
+                        range: [start, index]
+                    };
+
+                case 33: // !
+                case 61: // =
+                    index += 2;
+
+                    // !== and ===
+                    if (source.charCodeAt(index) === 61) {
+                        ++index;
+                    }
+                    return {
+                        type: Token.Punctuator,
+                        value: source.slice(start, index),
+                        range: [start, index]
+                    };
+                default:
+                    break;
+                }
+            }
+            break;
+        }
+
+        // Peek more characters.
+
+        ch2 = source[index + 1];
+
+        // Other 2-character punctuators: && ||
+
+        if (ch1 === ch2 && ('&|'.indexOf(ch1) >= 0)) {
+            index += 2;
+            return {
+                type: Token.Punctuator,
+                value: ch1 + ch2,
+                range: [start, index]
+            };
+        }
+
+        if ('<>=!+-*%&|^/'.indexOf(ch1) >= 0) {
+            ++index;
+            return {
+                type: Token.Punctuator,
+                value: ch1,
+                range: [start, index]
+            };
+        }
+
+        throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
+    }
+
+    // 7.8.3 Numeric Literals
+    function scanNumericLiteral() {
+        var number, start, ch;
+
+        ch = source[index];
+        assert(isDecimalDigit(ch.charCodeAt(0)) || (ch === '.'),
+            'Numeric literal must start with a decimal digit or a decimal point');
+
+        start = index;
+        number = '';
+        if (ch !== '.') {
+            number = source[index++];
+            ch = source[index];
+
+            // Hex number starts with '0x'.
+            // Octal number starts with '0'.
+            if (number === '0') {
+                // decimal number starts with '0' such as '09' is illegal.
+                if (ch && isDecimalDigit(ch.charCodeAt(0))) {
+                    throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
+                }
+            }
+
+            while (isDecimalDigit(source.charCodeAt(index))) {
+                number += source[index++];
+            }
+            ch = source[index];
+        }
+
+        if (ch === '.') {
+            number += source[index++];
+            while (isDecimalDigit(source.charCodeAt(index))) {
+                number += source[index++];
+            }
+            ch = source[index];
+        }
+
+        if (ch === 'e' || ch === 'E') {
+            number += source[index++];
+
+            ch = source[index];
+            if (ch === '+' || ch === '-') {
+                number += source[index++];
+            }
+            if (isDecimalDigit(source.charCodeAt(index))) {
+                while (isDecimalDigit(source.charCodeAt(index))) {
+                    number += source[index++];
+                }
+            } else {
+                throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
+            }
+        }
+
+        if (isIdentifierStart(source.charCodeAt(index))) {
+            throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
+        }
+
+        return {
+            type: Token.NumericLiteral,
+            value: parseFloat(number),
+            range: [start, index]
+        };
+    }
+
+    // 7.8.4 String Literals
+
+    function scanStringLiteral() {
+        var str = '', quote, start, ch, octal = false;
+
+        quote = source[index];
+        assert((quote === '\'' || quote === '"'),
+            'String literal must starts with a quote');
+
+        start = index;
+        ++index;
+
+        while (index < length) {
+            ch = source[index++];
+
+            if (ch === quote) {
+                quote = '';
+                break;
+            } else if (ch === '\\') {
+                ch = source[index++];
+                if (!ch || !isLineTerminator(ch.charCodeAt(0))) {
+                    switch (ch) {
+                    case 'n':
+                        str += '\n';
+                        break;
+                    case 'r':
+                        str += '\r';
+                        break;
+                    case 't':
+                        str += '\t';
+                        break;
+                    case 'b':
+                        str += '\b';
+                        break;
+                    case 'f':
+                        str += '\f';
+                        break;
+                    case 'v':
+                        str += '\x0B';
+                        break;
+
+                    default:
+                        str += ch;
+                        break;
+                    }
+                } else {
+                    if (ch ===  '\r' && source[index] === '\n') {
+                        ++index;
+                    }
+                }
+            } else if (isLineTerminator(ch.charCodeAt(0))) {
+                break;
+            } else {
+                str += ch;
+            }
+        }
+
+        if (quote !== '') {
+            throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
+        }
+
+        return {
+            type: Token.StringLiteral,
+            value: str,
+            octal: octal,
+            range: [start, index]
+        };
+    }
+
+    function isIdentifierName(token) {
+        return token.type === Token.Identifier ||
+            token.type === Token.Keyword ||
+            token.type === Token.BooleanLiteral ||
+            token.type === Token.NullLiteral;
+    }
+
+    function advance() {
+        var ch;
+
+        skipWhitespace();
+
+        if (index >= length) {
+            return {
+                type: Token.EOF,
+                range: [index, index]
+            };
+        }
+
+        ch = source.charCodeAt(index);
+
+        // Very common: ( and ) and ;
+        if (ch === 40 || ch === 41 || ch === 58) {
+            return scanPunctuator();
+        }
+
+        // String literal starts with single quote (#39) or double quote (#34).
+        if (ch === 39 || ch === 34) {
+            return scanStringLiteral();
+        }
+
+        if (isIdentifierStart(ch)) {
+            return scanIdentifier();
+        }
+
+        // Dot (.) char #46 can also start a floating-point number, hence the need
+        // to check the next character.
+        if (ch === 46) {
+            if (isDecimalDigit(source.charCodeAt(index + 1))) {
+                return scanNumericLiteral();
+            }
+            return scanPunctuator();
+        }
+
+        if (isDecimalDigit(ch)) {
+            return scanNumericLiteral();
+        }
+
+        return scanPunctuator();
+    }
+
+    function lex() {
+        var token;
+
+        token = lookahead;
+        index = token.range[1];
+
+        lookahead = advance();
+
+        index = token.range[1];
+
+        return token;
+    }
+
+    function peek() {
+        var pos;
+
+        pos = index;
+        lookahead = advance();
+        index = pos;
+    }
+
+    // Throw an exception
+
+    function throwError(token, messageFormat) {
+        var error,
+            args = Array.prototype.slice.call(arguments, 2),
+            msg = messageFormat.replace(
+                /%(\d)/g,
+                function (whole, index) {
+                    assert(index < args.length, 'Message reference must be in range');
+                    return args[index];
+                }
+            );
+
+        error = new Error(msg);
+        error.index = index;
+        error.description = msg;
+        throw error;
+    }
+
+    // Throw an exception because of the token.
+
+    function throwUnexpected(token) {
+        throwError(token, Messages.UnexpectedToken, token.value);
+    }
+
+    // Expect the next token to match the specified punctuator.
+    // If not, an exception will be thrown.
+
+    function expect(value) {
+        var token = lex();
+        if (token.type !== Token.Punctuator || token.value !== value) {
+            throwUnexpected(token);
+        }
+    }
+
+    // Return true if the next token matches the specified punctuator.
+
+    function match(value) {
+        return lookahead.type === Token.Punctuator && lookahead.value === value;
+    }
+
+    // Return true if the next token matches the specified keyword
+
+    function matchKeyword(keyword) {
+        return lookahead.type === Token.Keyword && lookahead.value === keyword;
+    }
+
+    function consumeSemicolon() {
+        // Catch the very common case first: immediately a semicolon (char #59).
+        if (source.charCodeAt(index) === 59) {
+            lex();
+            return;
+        }
+
+        skipWhitespace();
+
+        if (match(';')) {
+            lex();
+            return;
+        }
+
+        if (lookahead.type !== Token.EOF && !match('}')) {
+            throwUnexpected(lookahead);
+        }
+    }
+
+    // 11.1.4 Array Initialiser
+
+    function parseArrayInitialiser() {
+        var elements = [];
+
+        expect('[');
+
+        while (!match(']')) {
+            if (match(',')) {
+                lex();
+                elements.push(null);
+            } else {
+                elements.push(parseExpression());
+
+                if (!match(']')) {
+                    expect(',');
+                }
+            }
+        }
+
+        expect(']');
+
+        return delegate.createArrayExpression(elements);
+    }
+
+    // 11.1.5 Object Initialiser
+
+    function parseObjectPropertyKey() {
+        var token;
+
+        skipWhitespace();
+        token = lex();
+
+        // Note: This function is called only from parseObjectProperty(), where
+        // EOF and Punctuator tokens are already filtered out.
+        if (token.type === Token.StringLiteral || token.type === Token.NumericLiteral) {
+            return delegate.createLiteral(token);
+        }
+
+        return delegate.createIdentifier(token.value);
+    }
+
+    function parseObjectProperty() {
+        var token, key;
+
+        token = lookahead;
+        skipWhitespace();
+
+        if (token.type === Token.EOF || token.type === Token.Punctuator) {
+            throwUnexpected(token);
+        }
+
+        key = parseObjectPropertyKey();
+        expect(':');
+        return delegate.createProperty('init', key, parseExpression());
+    }
+
+    function parseObjectInitialiser() {
+        var properties = [];
+
+        expect('{');
+
+        while (!match('}')) {
+            properties.push(parseObjectProperty());
+
+            if (!match('}')) {
+                expect(',');
+            }
+        }
+
+        expect('}');
+
+        return delegate.createObjectExpression(properties);
+    }
+
+    // 11.1.6 The Grouping Operator
+
+    function parseGroupExpression() {
+        var expr;
+
+        expect('(');
+
+        expr = parseExpression();
+
+        expect(')');
+
+        return expr;
+    }
+
+
+    // 11.1 Primary Expressions
+
+    function parsePrimaryExpression() {
+        var type, token, expr;
+
+        if (match('(')) {
+            return parseGroupExpression();
+        }
+
+        type = lookahead.type;
+
+        if (type === Token.Identifier) {
+            expr = delegate.createIdentifier(lex().value);
+        } else if (type === Token.StringLiteral || type === Token.NumericLiteral) {
+            expr = delegate.createLiteral(lex());
+        } else if (type === Token.Keyword) {
+            if (matchKeyword('this')) {
+                lex();
+                expr = delegate.createThisExpression();
+            }
+        } else if (type === Token.BooleanLiteral) {
+            token = lex();
+            token.value = (token.value === 'true');
+            expr = delegate.createLiteral(token);
+        } else if (type === Token.NullLiteral) {
+            token = lex();
+            token.value = null;
+            expr = delegate.createLiteral(token);
+        } else if (match('[')) {
+            expr = parseArrayInitialiser();
+        } else if (match('{')) {
+            expr = parseObjectInitialiser();
+        }
+
+        if (expr) {
+            return expr;
+        }
+
+        throwUnexpected(lex());
+    }
+
+    // 11.2 Left-Hand-Side Expressions
+
+    function parseArguments() {
+        var args = [];
+
+        expect('(');
+
+        if (!match(')')) {
+            while (index < length) {
+                args.push(parseExpression());
+                if (match(')')) {
+                    break;
+                }
+                expect(',');
+            }
+        }
+
+        expect(')');
+
+        return args;
+    }
+
+    function parseNonComputedProperty() {
+        var token;
+
+        token = lex();
+
+        if (!isIdentifierName(token)) {
+            throwUnexpected(token);
+        }
+
+        return delegate.createIdentifier(token.value);
+    }
+
+    function parseNonComputedMember() {
+        expect('.');
+
+        return parseNonComputedProperty();
+    }
+
+    function parseComputedMember() {
+        var expr;
+
+        expect('[');
+
+        expr = parseExpression();
+
+        expect(']');
+
+        return expr;
+    }
+
+    function parseLeftHandSideExpression() {
+        var expr, args, property;
+
+        expr = parsePrimaryExpression();
+
+        while (true) {
+            if (match('[')) {
+                property = parseComputedMember();
+                expr = delegate.createMemberExpression('[', expr, property);
+            } else if (match('.')) {
+                property = parseNonComputedMember();
+                expr = delegate.createMemberExpression('.', expr, property);
+            } else if (match('(')) {
+                args = parseArguments();
+                expr = delegate.createCallExpression(expr, args);
+            } else {
+                break;
+            }
+        }
+
+        return expr;
+    }
+
+    // 11.3 Postfix Expressions
+
+    var parsePostfixExpression = parseLeftHandSideExpression;
+
+    // 11.4 Unary Operators
+
+    function parseUnaryExpression() {
+        var token, expr;
+
+        if (lookahead.type !== Token.Punctuator && lookahead.type !== Token.Keyword) {
+            expr = parsePostfixExpression();
+        } else if (match('+') || match('-') || match('!')) {
+            token = lex();
+            expr = parseUnaryExpression();
+            expr = delegate.createUnaryExpression(token.value, expr);
+        } else if (matchKeyword('delete') || matchKeyword('void') || matchKeyword('typeof')) {
+            throwError({}, Messages.UnexpectedToken);
+        } else {
+            expr = parsePostfixExpression();
+        }
+
+        return expr;
+    }
+
+    function binaryPrecedence(token) {
+        var prec = 0;
+
+        if (token.type !== Token.Punctuator && token.type !== Token.Keyword) {
+            return 0;
+        }
+
+        switch (token.value) {
+        case '||':
+            prec = 1;
+            break;
+
+        case '&&':
+            prec = 2;
+            break;
+
+        case '==':
+        case '!=':
+        case '===':
+        case '!==':
+            prec = 6;
+            break;
+
+        case '<':
+        case '>':
+        case '<=':
+        case '>=':
+        case 'instanceof':
+            prec = 7;
+            break;
+
+        case 'in':
+            prec = 7;
+            break;
+
+        case '+':
+        case '-':
+            prec = 9;
+            break;
+
+        case '*':
+        case '/':
+        case '%':
+            prec = 11;
+            break;
+
+        default:
+            break;
+        }
+
+        return prec;
+    }
+
+    // 11.5 Multiplicative Operators
+    // 11.6 Additive Operators
+    // 11.7 Bitwise Shift Operators
+    // 11.8 Relational Operators
+    // 11.9 Equality Operators
+    // 11.10 Binary Bitwise Operators
+    // 11.11 Binary Logical Operators
+
+    function parseBinaryExpression() {
+        var expr, token, prec, stack, right, operator, left, i;
+
+        left = parseUnaryExpression();
+
+        token = lookahead;
+        prec = binaryPrecedence(token);
+        if (prec === 0) {
+            return left;
+        }
+        token.prec = prec;
+        lex();
+
+        right = parseUnaryExpression();
+
+        stack = [left, token, right];
+
+        while ((prec = binaryPrecedence(lookahead)) > 0) {
+
+            // Reduce: make a binary expression from the three topmost entries.
+            while ((stack.length > 2) && (prec <= stack[stack.length - 2].prec)) {
+                right = stack.pop();
+                operator = stack.pop().value;
+                left = stack.pop();
+                expr = delegate.createBinaryExpression(operator, left, right);
+                stack.push(expr);
+            }
+
+            // Shift.
+            token = lex();
+            token.prec = prec;
+            stack.push(token);
+            expr = parseUnaryExpression();
+            stack.push(expr);
+        }
+
+        // Final reduce to clean-up the stack.
+        i = stack.length - 1;
+        expr = stack[i];
+        while (i > 1) {
+            expr = delegate.createBinaryExpression(stack[i - 1].value, stack[i - 2], expr);
+            i -= 2;
+        }
+
+        return expr;
+    }
+
+
+    // 11.12 Conditional Operator
+
+    function parseConditionalExpression() {
+        var expr, consequent, alternate;
+
+        expr = parseBinaryExpression();
+
+        if (match('?')) {
+            lex();
+            consequent = parseConditionalExpression();
+            expect(':');
+            alternate = parseConditionalExpression();
+
+            expr = delegate.createConditionalExpression(expr, consequent, alternate);
+        }
+
+        return expr;
+    }
+
+    // Simplification since we do not support AssignmentExpression.
+    var parseExpression = parseConditionalExpression;
+
+    // Polymer Syntax extensions
+
+    // Filter ::
+    //   Identifier
+    //   Identifier "(" ")"
+    //   Identifier "(" FilterArguments ")"
+
+    function parseFilter() {
+        var identifier, args;
+
+        identifier = lex();
+
+        if (identifier.type !== Token.Identifier) {
+            throwUnexpected(identifier);
+        }
+
+        args = match('(') ? parseArguments() : [];
+
+        return delegate.createFilter(identifier.value, args);
+    }
+
+    // Filters ::
+    //   "|" Filter
+    //   Filters "|" Filter
+
+    function parseFilters() {
+        while (match('|')) {
+            lex();
+            parseFilter();
+        }
+    }
+
+    // TopLevel ::
+    //   LabelledExpressions
+    //   AsExpression
+    //   InExpression
+    //   FilterExpression
+
+    // AsExpression ::
+    //   FilterExpression as Identifier
+
+    // InExpression ::
+    //   Identifier, Identifier in FilterExpression
+    //   Identifier in FilterExpression
+
+    // FilterExpression ::
+    //   Expression
+    //   Expression Filters
+
+    function parseTopLevel() {
+        skipWhitespace();
+        peek();
+
+        var expr = parseExpression();
+        if (expr) {
+            if (lookahead.value === ',' || lookahead.value == 'in' &&
+                       expr.type === Syntax.Identifier) {
+                parseInExpression(expr);
+            } else {
+                parseFilters();
+                if (lookahead.value === 'as') {
+                    parseAsExpression(expr);
+                } else {
+                    delegate.createTopLevel(expr);
+                }
+            }
+        }
+
+        if (lookahead.type !== Token.EOF) {
+            throwUnexpected(lookahead);
+        }
+    }
+
+    function parseAsExpression(expr) {
+        lex();  // as
+        var identifier = lex().value;
+        delegate.createAsExpression(expr, identifier);
+    }
+
+    function parseInExpression(identifier) {
+        var indexName;
+        if (lookahead.value === ',') {
+            lex();
+            if (lookahead.type !== Token.Identifier)
+                throwUnexpected(lookahead);
+            indexName = lex().value;
+        }
+
+        lex();  // in
+        var expr = parseExpression();
+        parseFilters();
+        delegate.createInExpression(identifier.name, indexName, expr);
+    }
+
+    function parse(code, inDelegate) {
+        delegate = inDelegate;
+        source = code;
+        index = 0;
+        length = source.length;
+        lookahead = null;
+        state = {
+            labelSet: {}
+        };
+
+        return parseTopLevel();
+    }
+
+    global.esprima = {
+        parse: parse
+    };
+})(this);
+
+// Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
+// This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+// The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+// The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+// Code distributed by Google as part of the polymer project is also
+// subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+
+(function (global) {
+  'use strict';
+
+  function prepareBinding(expressionText, name, node, filterRegistry) {
+    var expression;
+    try {
+      expression = getExpression(expressionText);
+      if (expression.scopeIdent &&
+          (node.nodeType !== Node.ELEMENT_NODE ||
+           node.tagName !== 'TEMPLATE' ||
+           (name !== 'bind' && name !== 'repeat'))) {
+        throw Error('as and in can only be used within <template bind/repeat>');
+      }
+    } catch (ex) {
+      console.error('Invalid expression syntax: ' + expressionText, ex);
+      return;
+    }
+
+    return function(model, node, oneTime) {
+      var binding = expression.getBinding(model, filterRegistry, oneTime);
+      if (expression.scopeIdent && binding) {
+        node.polymerExpressionScopeIdent_ = expression.scopeIdent;
+        if (expression.indexIdent)
+          node.polymerExpressionIndexIdent_ = expression.indexIdent;
+      }
+
+      return binding;
+    }
+  }
+
+  // TODO(rafaelw): Implement simple LRU.
+  var expressionParseCache = Object.create(null);
+
+  function getExpression(expressionText) {
+    var expression = expressionParseCache[expressionText];
+    if (!expression) {
+      var delegate = new ASTDelegate();
+      esprima.parse(expressionText, delegate);
+      expression = new Expression(delegate);
+      expressionParseCache[expressionText] = expression;
+    }
+    return expression;
+  }
+
+  function Literal(value) {
+    this.value = value;
+    this.valueFn_ = undefined;
+  }
+
+  Literal.prototype = {
+    valueFn: function() {
+      if (!this.valueFn_) {
+        var value = this.value;
+        this.valueFn_ = function() {
+          return value;
+        }
+      }
+
+      return this.valueFn_;
+    }
+  }
+
+  function IdentPath(name) {
+    this.name = name;
+    this.path = Path.get(name);
+  }
+
+  IdentPath.prototype = {
+    valueFn: function() {
+      if (!this.valueFn_) {
+        var name = this.name;
+        var path = this.path;
+        this.valueFn_ = function(model, observer) {
+          if (observer)
+            observer.addPath(model, path);
+
+          return path.getValueFrom(model);
+        }
+      }
+
+      return this.valueFn_;
+    },
+
+    setValue: function(model, newValue) {
+      if (this.path.length == 1);
+        model = findScope(model, this.path[0]);
+
+      return this.path.setValueFrom(model, newValue);
+    }
+  };
+
+  function MemberExpression(object, property, accessor) {
+    this.computed = accessor == '[';
+
+    this.dynamicDeps = typeof object == 'function' ||
+                       object.dynamicDeps ||
+                       (this.computed && !(property instanceof Literal));
+
+    this.simplePath =
+        !this.dynamicDeps &&
+        (property instanceof IdentPath || property instanceof Literal) &&
+        (object instanceof MemberExpression || object instanceof IdentPath);
+
+    this.object = this.simplePath ? object : getFn(object);
+    this.property = !this.computed || this.simplePath ?
+        property : getFn(property);
+  }
+
+  MemberExpression.prototype = {
+    get fullPath() {
+      if (!this.fullPath_) {
+
+        var parts = this.object instanceof MemberExpression ?
+            this.object.fullPath.slice() : [this.object.name];
+        parts.push(this.property instanceof IdentPath ?
+            this.property.name : this.property.value);
+        this.fullPath_ = Path.get(parts);
+      }
+
+      return this.fullPath_;
+    },
+
+    valueFn: function() {
+      if (!this.valueFn_) {
+        var object = this.object;
+
+        if (this.simplePath) {
+          var path = this.fullPath;
+
+          this.valueFn_ = function(model, observer) {
+            if (observer)
+              observer.addPath(model, path);
+
+            return path.getValueFrom(model);
+          };
+        } else if (!this.computed) {
+          var path = Path.get(this.property.name);
+
+          this.valueFn_ = function(model, observer, filterRegistry) {
+            var context = object(model, observer, filterRegistry);
+
+            if (observer)
+              observer.addPath(context, path);
+
+            return path.getValueFrom(context);
+          }
+        } else {
+          // Computed property.
+          var property = this.property;
+
+          this.valueFn_ = function(model, observer, filterRegistry) {
+            var context = object(model, observer, filterRegistry);
+            var propName = property(model, observer, filterRegistry);
+            if (observer)
+              observer.addPath(context, [propName]);
+
+            return context ? context[propName] : undefined;
+          };
+        }
+      }
+      return this.valueFn_;
+    },
+
+    setValue: function(model, newValue) {
+      if (this.simplePath) {
+        this.fullPath.setValueFrom(model, newValue);
+        return newValue;
+      }
+
+      var object = this.object(model);
+      var propName = this.property instanceof IdentPath ? this.property.name :
+          this.property(model);
+      return object[propName] = newValue;
+    }
+  };
+
+  function Filter(name, args) {
+    this.name = name;
+    this.args = [];
+    for (var i = 0; i < args.length; i++) {
+      this.args[i] = getFn(args[i]);
+    }
+  }
+
+  Filter.prototype = {
+    transform: function(model, observer, filterRegistry, toModelDirection,
+                        initialArgs) {
+      var fn = filterRegistry[this.name];
+      var context = model;
+      if (fn) {
+        context = undefined;
+      } else {
+        fn = context[this.name];
+        if (!fn) {
+          console.error('Cannot find function or filter: ' + this.name);
+          return;
+        }
+      }
+
+      // If toModelDirection is falsey, then the "normal" (dom-bound) direction
+      // is used. Otherwise, it looks for a 'toModel' property function on the
+      // object.
+      if (toModelDirection) {
+        fn = fn.toModel;
+      } else if (typeof fn.toDOM == 'function') {
+        fn = fn.toDOM;
+      }
+
+      if (typeof fn != 'function') {
+        console.error('Cannot find function or filter: ' + this.name);
+        return;
+      }
+
+      var args = initialArgs || [];
+      for (var i = 0; i < this.args.length; i++) {
+        args.push(getFn(this.args[i])(model, observer, filterRegistry));
+      }
+
+      return fn.apply(context, args);
+    }
+  };
+
+  function notImplemented() { throw Error('Not Implemented'); }
+
+  var unaryOperators = {
+    '+': function(v) { return +v; },
+    '-': function(v) { return -v; },
+    '!': function(v) { return !v; }
+  };
+
+  var binaryOperators = {
+    '+': function(l, r) { return l+r; },
+    '-': function(l, r) { return l-r; },
+    '*': function(l, r) { return l*r; },
+    '/': function(l, r) { return l/r; },
+    '%': function(l, r) { return l%r; },
+    '<': function(l, r) { return l<r; },
+    '>': function(l, r) { return l>r; },
+    '<=': function(l, r) { return l<=r; },
+    '>=': function(l, r) { return l>=r; },
+    '==': function(l, r) { return l==r; },
+    '!=': function(l, r) { return l!=r; },
+    '===': function(l, r) { return l===r; },
+    '!==': function(l, r) { return l!==r; },
+    '&&': function(l, r) { return l&&r; },
+    '||': function(l, r) { return l||r; },
+  };
+
+  function getFn(arg) {
+    return typeof arg == 'function' ? arg : arg.valueFn();
+  }
+
+  function ASTDelegate() {
+    this.expression = null;
+    this.filters = [];
+    this.deps = {};
+    this.currentPath = undefined;
+    this.scopeIdent = undefined;
+    this.indexIdent = undefined;
+    this.dynamicDeps = false;
+  }
+
+  ASTDelegate.prototype = {
+    createUnaryExpression: function(op, argument) {
+      if (!unaryOperators[op])
+        throw Error('Disallowed operator: ' + op);
+
+      argument = getFn(argument);
+
+      return function(model, observer, filterRegistry) {
+        return unaryOperators[op](argument(model, observer, filterRegistry));
+      };
+    },
+
+    createBinaryExpression: function(op, left, right) {
+      if (!binaryOperators[op])
+        throw Error('Disallowed operator: ' + op);
+
+      left = getFn(left);
+      right = getFn(right);
+
+      switch (op) {
+        case '||':
+          this.dynamicDeps = true;
+          return function(model, observer, filterRegistry) {
+            return left(model, observer, filterRegistry) ||
+                right(model, observer, filterRegistry);
+          };
+        case '&&':
+          this.dynamicDeps = true;
+          return function(model, observer, filterRegistry) {
+            return left(model, observer, filterRegistry) &&
+                right(model, observer, filterRegistry);
+          };
+      }
+
+      return function(model, observer, filterRegistry) {
+        return binaryOperators[op](left(model, observer, filterRegistry),
+                                   right(model, observer, filterRegistry));
+      };
+    },
+
+    createConditionalExpression: function(test, consequent, alternate) {
+      test = getFn(test);
+      consequent = getFn(consequent);
+      alternate = getFn(alternate);
+
+      this.dynamicDeps = true;
+
+      return function(model, observer, filterRegistry) {
+        return test(model, observer, filterRegistry) ?
+            consequent(model, observer, filterRegistry) :
+            alternate(model, observer, filterRegistry);
+      }
+    },
+
+    createIdentifier: function(name) {
+      var ident = new IdentPath(name);
+      ident.type = 'Identifier';
+      return ident;
+    },
+
+    createMemberExpression: function(accessor, object, property) {
+      var ex = new MemberExpression(object, property, accessor);
+      if (ex.dynamicDeps)
+        this.dynamicDeps = true;
+      return ex;
+    },
+
+    createCallExpression: function(expression, args) {
+      if (!(expression instanceof IdentPath))
+        throw Error('Only identifier function invocations are allowed');
+
+      var filter = new Filter(expression.name, args);
+
+      return function(model, observer, filterRegistry) {
+        return filter.transform(model, observer, filterRegistry, false);
+      };
+    },
+
+    createLiteral: function(token) {
+      return new Literal(token.value);
+    },
+
+    createArrayExpression: function(elements) {
+      for (var i = 0; i < elements.length; i++)
+        elements[i] = getFn(elements[i]);
+
+      return function(model, observer, filterRegistry) {
+        var arr = []
+        for (var i = 0; i < elements.length; i++)
+          arr.push(elements[i](model, observer, filterRegistry));
+        return arr;
+      }
+    },
+
+    createProperty: function(kind, key, value) {
+      return {
+        key: key instanceof IdentPath ? key.name : key.value,
+        value: value
+      };
+    },
+
+    createObjectExpression: function(properties) {
+      for (var i = 0; i < properties.length; i++)
+        properties[i].value = getFn(properties[i].value);
+
+      return function(model, observer, filterRegistry) {
+        var obj = {};
+        for (var i = 0; i < properties.length; i++)
+          obj[properties[i].key] =
+              properties[i].value(model, observer, filterRegistry);
+        return obj;
+      }
+    },
+
+    createFilter: function(name, args) {
+      this.filters.push(new Filter(name, args));
+    },
+
+    createAsExpression: function(expression, scopeIdent) {
+      this.expression = expression;
+      this.scopeIdent = scopeIdent;
+    },
+
+    createInExpression: function(scopeIdent, indexIdent, expression) {
+      this.expression = expression;
+      this.scopeIdent = scopeIdent;
+      this.indexIdent = indexIdent;
+    },
+
+    createTopLevel: function(expression) {
+      this.expression = expression;
+    },
+
+    createThisExpression: notImplemented
+  }
+
+  function ConstantObservable(value) {
+    this.value_ = value;
+  }
+
+  ConstantObservable.prototype = {
+    open: function() { return this.value_; },
+    discardChanges: function() { return this.value_; },
+    deliver: function() {},
+    close: function() {},
+  }
+
+  function Expression(delegate) {
+    this.scopeIdent = delegate.scopeIdent;
+    this.indexIdent = delegate.indexIdent;
+
+    if (!delegate.expression)
+      throw Error('No expression found.');
+
+    this.expression = delegate.expression;
+    getFn(this.expression); // forces enumeration of path dependencies
+
+    this.filters = delegate.filters;
+    this.dynamicDeps = delegate.dynamicDeps;
+  }
+
+  Expression.prototype = {
+    getBinding: function(model, filterRegistry, oneTime) {
+      if (oneTime)
+        return this.getValue(model, undefined, filterRegistry);
+
+      var observer = new CompoundObserver();
+      // captures deps.
+      var firstValue = this.getValue(model, observer, filterRegistry);
+      var firstTime = true;
+      var self = this;
+
+      function valueFn() {
+        // deps cannot have changed on first value retrieval.
+        if (firstTime) {
+          firstTime = false;
+          return firstValue;
+        }
+
+        if (self.dynamicDeps)
+          observer.startReset();
+
+        var value = self.getValue(model,
+                                  self.dynamicDeps ? observer : undefined,
+                                  filterRegistry);
+        if (self.dynamicDeps)
+          observer.finishReset();
+
+        return value;
+      }
+
+      function setValueFn(newValue) {
+        self.setValue(model, newValue, filterRegistry);
+        return newValue;
+      }
+
+      return new ObserverTransform(observer, valueFn, setValueFn, true);
+    },
+
+    getValue: function(model, observer, filterRegistry) {
+      var value = getFn(this.expression)(model, observer, filterRegistry);
+      for (var i = 0; i < this.filters.length; i++) {
+        value = this.filters[i].transform(model, observer, filterRegistry,
+            false, [value]);
+      }
+
+      return value;
+    },
+
+    setValue: function(model, newValue, filterRegistry) {
+      var count = this.filters ? this.filters.length : 0;
+      while (count-- > 0) {
+        newValue = this.filters[count].transform(model, undefined,
+            filterRegistry, true, [newValue]);
+      }
+
+      if (this.expression.setValue)
+        return this.expression.setValue(model, newValue);
+    }
+  }
+
+  /**
+   * Converts a style property name to a css property name. For example:
+   * "WebkitUserSelect" to "-webkit-user-select"
+   */
+  function convertStylePropertyName(name) {
+    return String(name).replace(/[A-Z]/g, function(c) {
+      return '-' + c.toLowerCase();
+    });
+  }
+
+  var parentScopeName = '@' + Math.random().toString(36).slice(2);
+
+  // Single ident paths must bind directly to the appropriate scope object.
+  // I.e. Pushed values in two-bindings need to be assigned to the actual model
+  // object.
+  function findScope(model, prop) {
+    while (model[parentScopeName] &&
+           !Object.prototype.hasOwnProperty.call(model, prop)) {
+      model = model[parentScopeName];
+    }
+
+    return model;
+  }
+
+  function isLiteralExpression(pathString) {
+    switch (pathString) {
+      case '':
+        return false;
+
+      case 'false':
+      case 'null':
+      case 'true':
+        return true;
+    }
+
+    if (!isNaN(Number(pathString)))
+      return true;
+
+    return false;
+  };
+
+  function PolymerExpressions() {}
+
+  PolymerExpressions.prototype = {
+    // "built-in" filters
+    styleObject: function(value) {
+      var parts = [];
+      for (var key in value) {
+        parts.push(convertStylePropertyName(key) + ': ' + value[key]);
+      }
+      return parts.join('; ');
+    },
+
+    tokenList: function(value) {
+      var tokens = [];
+      for (var key in value) {
+        if (value[key])
+          tokens.push(key);
+      }
+      return tokens.join(' ');
+    },
+
+    // binding delegate API
+    prepareInstancePositionChanged: function(template) {
+      var indexIdent = template.polymerExpressionIndexIdent_;
+      if (!indexIdent)
+        return;
+
+      return function(templateInstance, index) {
+        templateInstance.model[indexIdent] = index;
+      };
+    },
+
+    prepareBinding: function(pathString, name, node) {
+      var path = Path.get(pathString);
+
+      if (!isLiteralExpression(pathString) && path.valid) {
+        if (path.length == 1) {
+          return function(model, node, oneTime) {
+            if (oneTime)
+              return path.getValueFrom(model);
+
+            var scope = findScope(model, path[0]);
+            return new PathObserver(scope, path);
+          };
+        }
+        return; // bail out early if pathString is simple path.
+      }
+
+      return prepareBinding(pathString, name, node, this);
+    },
+
+    prepareInstanceModel: function(template) {
+      var scopeName = template.polymerExpressionScopeIdent_;
+      if (!scopeName)
+        return;
+
+      var parentScope = template.templateInstance ?
+          template.templateInstance.model :
+          template.model;
+
+      var indexName = template.polymerExpressionIndexIdent_;
+
+      return function(model) {
+        return createScopeObject(parentScope, model, scopeName, indexName);
+      };
+    }
+  };
+
+  var createScopeObject = ('__proto__' in {}) ?
+    function(parentScope, model, scopeName, indexName) {
+      var scope = {};
+      scope[scopeName] = model;
+      scope[indexName] = undefined;
+      scope[parentScopeName] = parentScope;
+      scope.__proto__ = parentScope;
+      return scope;
+    } :
+    function(parentScope, model, scopeName, indexName) {
+      var scope = Object.create(parentScope);
+      Object.defineProperty(scope, scopeName,
+          { value: model, configurable: true, writable: true });
+      Object.defineProperty(scope, indexName,
+          { value: undefined, configurable: true, writable: true });
+      Object.defineProperty(scope, parentScopeName,
+          { value: parentScope, configurable: true, writable: true });
+      return scope;
+    };
+
+  global.PolymerExpressions = PolymerExpressions;
+  PolymerExpressions.getExpression = getExpression;
+})(this);
+
+Polymer = {
+  version: '0.5.1'
+};
+
+// TODO(sorvell): this ensures Polymer is an object and not a function
+// Platform is currently defining it as a function to allow for async loading
+// of polymer; once we refine the loading process this likely goes away.
+if (typeof window.Polymer === 'function') {
+  Polymer = {};
+}
+
+
+(function(scope) {
+
+  function withDependencies(task, depends) {
+    depends = depends || [];
+    if (!depends.map) {
+      depends = [depends];
+    }
+    return task.apply(this, depends.map(marshal));
+  }
+
+  function module(name, dependsOrFactory, moduleFactory) {
+    var module;
+    switch (arguments.length) {
+      case 0:
+        return;
+      case 1:
+        module = null;
+        break;
+      case 2:
+        // dependsOrFactory is `factory` in this case
+        module = dependsOrFactory.apply(this);
+        break;
+      default:
+        // dependsOrFactory is `depends` in this case
+        module = withDependencies(moduleFactory, dependsOrFactory);
+        break;
+    }
+    modules[name] = module;
+  };
+
+  function marshal(name) {
+    return modules[name];
+  }
+
+  var modules = {};
+
+  function using(depends, task) {
+    HTMLImports.whenImportsReady(function() {
+      withDependencies(task, depends);
+    });
+  };
+
+  // exports
+
+  scope.marshal = marshal;
+  // `module` confuses commonjs detectors
+  scope.modularize = module;
+  scope.using = using;
+
+})(window);
+
+/*
+	Build only script.
+
+  Ensures scripts needed for basic x-platform compatibility
+  will be run when platform.js is not loaded.
+ */
+if (!window.WebComponents) {
+
+/*
+	On supported platforms, platform.js is not needed. To retain compatibility
+	with the polyfills, we stub out minimal functionality.
+ */
+if (!window.WebComponents) {
+
+  WebComponents = {
+  	flush: function() {},
+    flags: {log: {}}
+  };
+
+  Platform = WebComponents;
+
+  CustomElements = {
+  	useNative: true,
+    ready: true,
+    takeRecords: function() {},
+    instanceof: function(obj, base) {
+      return obj instanceof base;
+    }
+  };
+  
+  HTMLImports = {
+  	useNative: true
+  };
+
+  
+  addEventListener('HTMLImportsLoaded', function() {
+    document.dispatchEvent(
+      new CustomEvent('WebComponentsReady', {bubbles: true})
+    );
+  });
+
+
+  // ShadowDOM
+  ShadowDOMPolyfill = null;
+  wrap = unwrap = function(n){
+    return n;
+  };
+
+}
+
+/*
+  Create polyfill scope and feature detect native support.
+*/
+window.HTMLImports = window.HTMLImports || {flags:{}};
+
+(function(scope) {
+
+/**
+  Basic setup and simple module executer. We collect modules and then execute
+  the code later, only if it's necessary for polyfilling.
+*/
+var IMPORT_LINK_TYPE = 'import';
+var useNative = Boolean(IMPORT_LINK_TYPE in document.createElement('link'));
+
+/**
+  Support `currentScript` on all browsers as `document._currentScript.`
+
+  NOTE: We cannot polyfill `document.currentScript` because it's not possible
+  both to override and maintain the ability to capture the native value.
+  Therefore we choose to expose `_currentScript` both when native imports
+  and the polyfill are in use.
+*/
+// NOTE: ShadowDOMPolyfill intrusion.
+var hasShadowDOMPolyfill = Boolean(window.ShadowDOMPolyfill);
+var wrap = function(node) {
+  return hasShadowDOMPolyfill ? ShadowDOMPolyfill.wrapIfNeeded(node) : node;
+};
+var rootDocument = wrap(document);
+
+var currentScriptDescriptor = {
+  get: function() {
+    var script = HTMLImports.currentScript || document.currentScript ||
+        // NOTE: only works when called in synchronously executing code.
+        // readyState should check if `loading` but IE10 is
+        // interactive when scripts run so we cheat.
+        (document.readyState !== 'complete' ?
+        document.scripts[document.scripts.length - 1] : null);
+    return wrap(script);
+  },
+  configurable: true
+};
+
+Object.defineProperty(document, '_currentScript', currentScriptDescriptor);
+Object.defineProperty(rootDocument, '_currentScript', currentScriptDescriptor);
+
+/**
+  Add support for the `HTMLImportsLoaded` event and the `HTMLImports.whenReady`
+  method. This api is necessary because unlike the native implementation,
+  script elements do not force imports to resolve. Instead, users should wrap
+  code in either an `HTMLImportsLoaded` hander or after load time in an
+  `HTMLImports.whenReady(callback)` call.
+
+  NOTE: This module also supports these apis under the native implementation.
+  Therefore, if this file is loaded, the same code can be used under both
+  the polyfill and native implementation.
+ */
+
+var isIE = /Trident/.test(navigator.userAgent);
+
+// call a callback when all HTMLImports in the document at call time
+// (or at least document ready) have loaded.
+// 1. ensure the document is in a ready state (has dom), then
+// 2. watch for loading of imports and call callback when done
+function whenReady(callback, doc) {
+  doc = doc || rootDocument;
+  // if document is loading, wait and try again
+  whenDocumentReady(function() {
+    watchImportsLoad(callback, doc);
+  }, doc);
+}
+
+// call the callback when the document is in a ready state (has dom)
+var requiredReadyState = isIE ? 'complete' : 'interactive';
+var READY_EVENT = 'readystatechange';
+function isDocumentReady(doc) {
+  return (doc.readyState === 'complete' ||
+      doc.readyState === requiredReadyState);
+}
+
+// call <callback> when we ensure the document is in a ready state
+function whenDocumentReady(callback, doc) {
+  if (!isDocumentReady(doc)) {
+    var checkReady = function() {
+      if (doc.readyState === 'complete' ||
+          doc.readyState === requiredReadyState) {
+        doc.removeEventListener(READY_EVENT, checkReady);
+        whenDocumentReady(callback, doc);
+      }
+    };
+    doc.addEventListener(READY_EVENT, checkReady);
+  } else if (callback) {
+    callback();
+  }
+}
+
+function markTargetLoaded(event) {
+  event.target.__loaded = true;
+}
+
+// call <callback> when we ensure all imports have loaded
+function watchImportsLoad(callback, doc) {
+  var imports = doc.querySelectorAll('link[rel=import]');
+  var loaded = 0, l = imports.length;
+  function checkDone(d) {
+    if ((loaded == l) && callback) {
+       callback();
+    }
+  }
+  function loadedImport(e) {
+    markTargetLoaded(e);
+    loaded++;
+    checkDone();
+  }
+  if (l) {
+    for (var i=0, imp; (i<l) && (imp=imports[i]); i++) {
+      if (isImportLoaded(imp)) {
+        loadedImport.call(imp, {target: imp});
+      } else {
+        imp.addEventListener('load', loadedImport);
+        imp.addEventListener('error', loadedImport);
+      }
+    }
+  } else {
+    checkDone();
+  }
+}
+
+// NOTE: test for native imports loading is based on explicitly watching
+// all imports (see below).
+// However, we cannot rely on this entirely without watching the entire document
+// for import links. For perf reasons, currently only head is watched.
+// Instead, we fallback to checking if the import property is available
+// and the document is not itself loading.
+function isImportLoaded(link) {
+  return useNative ? link.__loaded ||
+      (link.import && link.import.readyState !== 'loading') :
+      link.__importParsed;
+}
+
+// TODO(sorvell): Workaround for
+// https://www.w3.org/Bugs/Public/show_bug.cgi?id=25007, should be removed when
+// this bug is addressed.
+// (1) Install a mutation observer to see when HTMLImports have loaded
+// (2) if this script is run during document load it will watch any existing
+// imports for loading.
+//
+// NOTE: The workaround has restricted functionality: (1) it's only compatible
+// with imports that are added to document.head since the mutation observer
+// watches only head for perf reasons, (2) it requires this script
+// to run before any imports have completed loading.
+if (useNative) {
+  new MutationObserver(function(mxns) {
+    for (var i=0, l=mxns.length, m; (i < l) && (m=mxns[i]); i++) {
+      if (m.addedNodes) {
+        handleImports(m.addedNodes);
+      }
+    }
+  }).observe(document.head, {childList: true});
+
+  function handleImports(nodes) {
+    for (var i=0, l=nodes.length, n; (i<l) && (n=nodes[i]); i++) {
+      if (isImport(n)) {
+        handleImport(n);
+      }
+    }
+  }
+
+  function isImport(element) {
+    return element.localName === 'link' && element.rel === 'import';
+  }
+
+  function handleImport(element) {
+    var loaded = element.import;
+    if (loaded) {
+      markTargetLoaded({target: element});
+    } else {
+      element.addEventListener('load', markTargetLoaded);
+      element.addEventListener('error', markTargetLoaded);
+    }
+  }
+
+  // make sure to catch any imports that are in the process of loading
+  // when this script is run.
+  (function() {
+    if (document.readyState === 'loading') {
+      var imports = document.querySelectorAll('link[rel=import]');
+      for (var i=0, l=imports.length, imp; (i<l) && (imp=imports[i]); i++) {
+        handleImport(imp);
+      }
+    }
+  })();
+
+}
+
+// Fire the 'HTMLImportsLoaded' event when imports in document at load time
+// have loaded. This event is required to simulate the script blocking
+// behavior of native imports. A main document script that needs to be sure
+// imports have loaded should wait for this event.
+whenReady(function() {
+  HTMLImports.ready = true;
+  HTMLImports.readyTime = new Date().getTime();
+  rootDocument.dispatchEvent(
+    new CustomEvent('HTMLImportsLoaded', {bubbles: true})
+  );
+});
+
+// exports
+scope.IMPORT_LINK_TYPE = IMPORT_LINK_TYPE;
+scope.useNative = useNative;
+scope.rootDocument = rootDocument;
+scope.whenReady = whenReady;
+scope.isIE = isIE;
+
+})(HTMLImports);
+
+(function(scope) {
+
+  // TODO(sorvell): It's desireable to provide a default stylesheet 
+  // that's convenient for styling unresolved elements, but
+  // it's cumbersome to have to include this manually in every page.
+  // It would make sense to put inside some HTMLImport but 
+  // the HTMLImports polyfill does not allow loading of stylesheets 
+  // that block rendering. Therefore this injection is tolerated here.
+  var style = document.createElement('style');
+  style.textContent = ''
+      + 'body {'
+      + 'transition: opacity ease-in 0.2s;' 
+      + ' } \n'
+      + 'body[unresolved] {'
+      + 'opacity: 0; display: block; overflow: hidden;' 
+      + ' } \n'
+      ;
+  var head = document.querySelector('head');
+  head.insertBefore(style, head.firstChild);
+
+})(Platform);
+
+/*
+	Build only script.
+
+  Ensures scripts needed for basic x-platform compatibility
+  will be run when platform.js is not loaded.
+ */
+}
+(function(global) {
+  'use strict';
+
+  var testingExposeCycleCount = global.testingExposeCycleCount;
+
+  // Detect and do basic sanity checking on Object/Array.observe.
+  function detectObjectObserve() {
+    if (typeof Object.observe !== 'function' ||
+        typeof Array.observe !== 'function') {
+      return false;
+    }
+
+    var records = [];
+
+    function callback(recs) {
+      records = recs;
+    }
+
+    var test = {};
+    var arr = [];
+    Object.observe(test, callback);
+    Array.observe(arr, callback);
+    test.id = 1;
+    test.id = 2;
+    delete test.id;
+    arr.push(1, 2);
+    arr.length = 0;
+
+    Object.deliverChangeRecords(callback);
+    if (records.length !== 5)
+      return false;
+
+    if (records[0].type != 'add' ||
+        records[1].type != 'update' ||
+        records[2].type != 'delete' ||
+        records[3].type != 'splice' ||
+        records[4].type != 'splice') {
+      return false;
+    }
+
+    Object.unobserve(test, callback);
+    Array.unobserve(arr, callback);
+
+    return true;
+  }
+
+  var hasObserve = detectObjectObserve();
+
+  function detectEval() {
+    // Don't test for eval if we're running in a Chrome App environment.
+    // We check for APIs set that only exist in a Chrome App context.
+    if (typeof chrome !== 'undefined' && chrome.app && chrome.app.runtime) {
+      return false;
+    }
+
+    // Firefox OS Apps do not allow eval. This feature detection is very hacky
+    // but even if some other platform adds support for this function this code
+    // will continue to work.
+    if (typeof navigator != 'undefined' && navigator.getDeviceStorage) {
+      return false;
+    }
+
+    try {
+      var f = new Function('', 'return true;');
+      return f();
+    } catch (ex) {
+      return false;
+    }
+  }
+
+  var hasEval = detectEval();
+
+  function isIndex(s) {
+    return +s === s >>> 0 && s !== '';
+  }
+
+  function toNumber(s) {
+    return +s;
+  }
+
+  function isObject(obj) {
+    return obj === Object(obj);
+  }
+
+  var numberIsNaN = global.Number.isNaN || function(value) {
+    return typeof value === 'number' && global.isNaN(value);
+  }
+
+  function areSameValue(left, right) {
+    if (left === right)
+      return left !== 0 || 1 / left === 1 / right;
+    if (numberIsNaN(left) && numberIsNaN(right))
+      return true;
+
+    return left !== left && right !== right;
+  }
+
+  var createObject = ('__proto__' in {}) ?
+    function(obj) { return obj; } :
+    function(obj) {
+      var proto = obj.__proto__;
+      if (!proto)
+        return obj;
+      var newObject = Object.create(proto);
+      Object.getOwnPropertyNames(obj).forEach(function(name) {
+        Object.defineProperty(newObject, name,
+                             Object.getOwnPropertyDescriptor(obj, name));
+      });
+      return newObject;
+    };
+
+  var identStart = '[\$_a-zA-Z]';
+  var identPart = '[\$_a-zA-Z0-9]';
+  var identRegExp = new RegExp('^' + identStart + '+' + identPart + '*' + '$');
+
+  function getPathCharType(char) {
+    if (char === undefined)
+      return 'eof';
+
+    var code = char.charCodeAt(0);
+
+    switch(code) {
+      case 0x5B: // [
+      case 0x5D: // ]
+      case 0x2E: // .
+      case 0x22: // "
+      case 0x27: // '
+      case 0x30: // 0
+        return char;
+
+      case 0x5F: // _
+      case 0x24: // $
+        return 'ident';
+
+      case 0x20: // Space
+      case 0x09: // Tab
+      case 0x0A: // Newline
+      case 0x0D: // Return
+      case 0xA0:  // No-break space
+      case 0xFEFF:  // Byte Order Mark
+      case 0x2028:  // Line Separator
+      case 0x2029:  // Paragraph Separator
+        return 'ws';
+    }
+
+    // a-z, A-Z
+    if ((0x61 <= code && code <= 0x7A) || (0x41 <= code && code <= 0x5A))
+      return 'ident';
+
+    // 1-9
+    if (0x31 <= code && code <= 0x39)
+      return 'number';
+
+    return 'else';
+  }
+
+  var pathStateMachine = {
+    'beforePath': {
+      'ws': ['beforePath'],
+      'ident': ['inIdent', 'append'],
+      '[': ['beforeElement'],
+      'eof': ['afterPath']
+    },
+
+    'inPath': {
+      'ws': ['inPath'],
+      '.': ['beforeIdent'],
+      '[': ['beforeElement'],
+      'eof': ['afterPath']
+    },
+
+    'beforeIdent': {
+      'ws': ['beforeIdent'],
+      'ident': ['inIdent', 'append']
+    },
+
+    'inIdent': {
+      'ident': ['inIdent', 'append'],
+      '0': ['inIdent', 'append'],
+      'number': ['inIdent', 'append'],
+      'ws': ['inPath', 'push'],
+      '.': ['beforeIdent', 'push'],
+      '[': ['beforeElement', 'push'],
+      'eof': ['afterPath', 'push']
+    },
+
+    'beforeElement': {
+      'ws': ['beforeElement'],
+      '0': ['afterZero', 'append'],
+      'number': ['inIndex', 'append'],
+      "'": ['inSingleQuote', 'append', ''],
+      '"': ['inDoubleQuote', 'append', '']
+    },
+
+    'afterZero': {
+      'ws': ['afterElement', 'push'],
+      ']': ['inPath', 'push']
+    },
+
+    'inIndex': {
+      '0': ['inIndex', 'append'],
+      'number': ['inIndex', 'append'],
+      'ws': ['afterElement'],
+      ']': ['inPath', 'push']
+    },
+
+    'inSingleQuote': {
+      "'": ['afterElement'],
+      'eof': ['error'],
+      'else': ['inSingleQuote', 'append']
+    },
+
+    'inDoubleQuote': {
+      '"': ['afterElement'],
+      'eof': ['error'],
+      'else': ['inDoubleQuote', 'append']
+    },
+
+    'afterElement': {
+      'ws': ['afterElement'],
+      ']': ['inPath', 'push']
+    }
+  }
+
+  function noop() {}
+
+  function parsePath(path) {
+    var keys = [];
+    var index = -1;
+    var c, newChar, key, type, transition, action, typeMap, mode = 'beforePath';
+
+    var actions = {
+      push: function() {
+        if (key === undefined)
+          return;
+
+        keys.push(key);
+        key = undefined;
+      },
+
+      append: function() {
+        if (key === undefined)
+          key = newChar
+        else
+          key += newChar;
+      }
+    };
+
+    function maybeUnescapeQuote() {
+      if (index >= path.length)
+        return;
+
+      var nextChar = path[index + 1];
+      if ((mode == 'inSingleQuote' && nextChar == "'") ||
+          (mode == 'inDoubleQuote' && nextChar == '"')) {
+        index++;
+        newChar = nextChar;
+        actions.append();
+        return true;
+      }
+    }
+
+    while (mode) {
+      index++;
+      c = path[index];
+
+      if (c == '\\' && maybeUnescapeQuote(mode))
+        continue;
+
+      type = getPathCharType(c);
+      typeMap = pathStateMachine[mode];
+      transition = typeMap[type] || typeMap['else'] || 'error';
+
+      if (transition == 'error')
+        return; // parse error;
+
+      mode = transition[0];
+      action = actions[transition[1]] || noop;
+      newChar = transition[2] === undefined ? c : transition[2];
+      action();
+
+      if (mode === 'afterPath') {
+        return keys;
+      }
+    }
+
+    return; // parse error
+  }
+
+  function isIdent(s) {
+    return identRegExp.test(s);
+  }
+
+  var constructorIsPrivate = {};
+
+  function Path(parts, privateToken) {
+    if (privateToken !== constructorIsPrivate)
+      throw Error('Use Path.get to retrieve path objects');
+
+    for (var i = 0; i < parts.length; i++) {
+      this.push(String(parts[i]));
+    }
+
+    if (hasEval && this.length) {
+      this.getValueFrom = this.compiledGetValueFromFn();
+    }
+  }
+
+  // TODO(rafaelw): Make simple LRU cache
+  var pathCache = {};
+
+  function getPath(pathString) {
+    if (pathString instanceof Path)
+      return pathString;
+
+    if (pathString == null || pathString.length == 0)
+      pathString = '';
+
+    if (typeof pathString != 'string') {
+      if (isIndex(pathString.length)) {
+        // Constructed with array-like (pre-parsed) keys
+        return new Path(pathString, constructorIsPrivate);
+      }
+
+      pathString = String(pathString);
+    }
+
+    var path = pathCache[pathString];
+    if (path)
+      return path;
+
+    var parts = parsePath(pathString);
+    if (!parts)
+      return invalidPath;
+
+    var path = new Path(parts, constructorIsPrivate);
+    pathCache[pathString] = path;
+    return path;
+  }
+
+  Path.get = getPath;
+
+  function formatAccessor(key) {
+    if (isIndex(key)) {
+      return '[' + key + ']';
+    } else {
+      return '["' + key.replace(/"/g, '\\"') + '"]';
+    }
+  }
+
+  Path.prototype = createObject({
+    __proto__: [],
+    valid: true,
+
+    toString: function() {
+      var pathString = '';
+      for (var i = 0; i < this.length; i++) {
+        var key = this[i];
+        if (isIdent(key)) {
+          pathString += i ? '.' + key : key;
+        } else {
+          pathString += formatAccessor(key);
+        }
+      }
+
+      return pathString;
+    },
+
+    getValueFrom: function(obj, directObserver) {
+      for (var i = 0; i < this.length; i++) {
+        if (obj == null)
+          return;
+        obj = obj[this[i]];
+      }
+      return obj;
+    },
+
+    iterateObjects: function(obj, observe) {
+      for (var i = 0; i < this.length; i++) {
+        if (i)
+          obj = obj[this[i - 1]];
+        if (!isObject(obj))
+          return;
+        observe(obj, this[i]);
+      }
+    },
+
+    compiledGetValueFromFn: function() {
+      var str = '';
+      var pathString = 'obj';
+      str += 'if (obj != null';
+      var i = 0;
+      var key;
+      for (; i < (this.length - 1); i++) {
+        key = this[i];
+        pathString += isIdent(key) ? '.' + key : formatAccessor(key);
+        str += ' &&\n     ' + pathString + ' != null';
+      }
+      str += ')\n';
+
+      var key = this[i];
+      pathString += isIdent(key) ? '.' + key : formatAccessor(key);
+
+      str += '  return ' + pathString + ';\nelse\n  return undefined;';
+      return new Function('obj', str);
+    },
+
+    setValueFrom: function(obj, value) {
+      if (!this.length)
+        return false;
+
+      for (var i = 0; i < this.length - 1; i++) {
+        if (!isObject(obj))
+          return false;
+        obj = obj[this[i]];
+      }
+
+      if (!isObject(obj))
+        return false;
+
+      obj[this[i]] = value;
+      return true;
+    }
+  });
+
+  var invalidPath = new Path('', constructorIsPrivate);
+  invalidPath.valid = false;
+  invalidPath.getValueFrom = invalidPath.setValueFrom = function() {};
+
+  var MAX_DIRTY_CHECK_CYCLES = 1000;
+
+  function dirtyCheck(observer) {
+    var cycles = 0;
+    while (cycles < MAX_DIRTY_CHECK_CYCLES && observer.check_()) {
+      cycles++;
+    }
+    if (testingExposeCycleCount)
+      global.dirtyCheckCycleCount = cycles;
+
+    return cycles > 0;
+  }
+
+  function objectIsEmpty(object) {
+    for (var prop in object)
+      return false;
+    return true;
+  }
+
+  function diffIsEmpty(diff) {
+    return objectIsEmpty(diff.added) &&
+           objectIsEmpty(diff.removed) &&
+           objectIsEmpty(diff.changed);
+  }
+
+  function diffObjectFromOldObject(object, oldObject) {
+    var added = {};
+    var removed = {};
+    var changed = {};
+
+    for (var prop in oldObject) {
+      var newValue = object[prop];
+
+      if (newValue !== undefined && newValue === oldObject[prop])
+        continue;
+
+      if (!(prop in object)) {
+        removed[prop] = undefined;
+        continue;
+      }
+
+      if (newValue !== oldObject[prop])
+        changed[prop] = newValue;
+    }
+
+    for (var prop in object) {
+      if (prop in oldObject)
+        continue;
+
+      added[prop] = object[prop];
+    }
+
+    if (Array.isArray(object) && object.length !== oldObject.length)
+      changed.length = object.length;
+
+    return {
+      added: added,
+      removed: removed,
+      changed: changed
+    };
+  }
+
+  var eomTasks = [];
+  function runEOMTasks() {
+    if (!eomTasks.length)
+      return false;
+
+    for (var i = 0; i < eomTasks.length; i++) {
+      eomTasks[i]();
+    }
+    eomTasks.length = 0;
+    return true;
+  }
+
+  var runEOM = hasObserve ? (function(){
+    return function(fn) {
+      return Promise.resolve().then(fn);
+    }
+  })() :
+  (function() {
+    return function(fn) {
+      eomTasks.push(fn);
+    };
+  })();
+
+  var observedObjectCache = [];
+
+  function newObservedObject() {
+    var observer;
+    var object;
+    var discardRecords = false;
+    var first = true;
+
+    function callback(records) {
+      if (observer && observer.state_ === OPENED && !discardRecords)
+        observer.check_(records);
+    }
+
+    return {
+      open: function(obs) {
+        if (observer)
+          throw Error('ObservedObject in use');
+
+        if (!first)
+          Object.deliverChangeRecords(callback);
+
+        observer = obs;
+        first = false;
+      },
+      observe: function(obj, arrayObserve) {
+        object = obj;
+        if (arrayObserve)
+          Array.observe(object, callback);
+        else
+          Object.observe(object, callback);
+      },
+      deliver: function(discard) {
+        discardRecords = discard;
+        Object.deliverChangeRecords(callback);
+        discardRecords = false;
+      },
+      close: function() {
+        observer = undefined;
+        Object.unobserve(object, callback);
+        observedObjectCache.push(this);
+      }
+    };
+  }
+
+  /*
+   * The observedSet abstraction is a perf optimization which reduces the total
+   * number of Object.observe observations of a set of objects. The idea is that
+   * groups of Observers will have some object dependencies in common and this
+   * observed set ensures that each object in the transitive closure of
+   * dependencies is only observed once. The observedSet acts as a write barrier
+   * such that whenever any change comes through, all Observers are checked for
+   * changed values.
+   *
+   * Note that this optimization is explicitly moving work from setup-time to
+   * change-time.
+   *
+   * TODO(rafaelw): Implement "garbage collection". In order to move work off
+   * the critical path, when Observers are closed, their observed objects are
+   * not Object.unobserve(d). As a result, it's possible that if the observedSet
+   * is kept open, but some Observers have been closed, it could cause "leaks"
+   * (prevent otherwise collectable objects from being collected). At some
+   * point, we should implement incremental "gc" which keeps a list of
+   * observedSets which may need clean-up and does small amounts of cleanup on a
+   * timeout until all is clean.
+   */
+
+  function getObservedObject(observer, object, arrayObserve) {
+    var dir = observedObjectCache.pop() || newObservedObject();
+    dir.open(observer);
+    dir.observe(object, arrayObserve);
+    return dir;
+  }
+
+  var observedSetCache = [];
+
+  function newObservedSet() {
+    var observerCount = 0;
+    var observers = [];
+    var objects = [];
+    var rootObj;
+    var rootObjProps;
+
+    function observe(obj, prop) {
+      if (!obj)
+        return;
+
+      if (obj === rootObj)
+        rootObjProps[prop] = true;
+
+      if (objects.indexOf(obj) < 0) {
+        objects.push(obj);
+        Object.observe(obj, callback);
+      }
+
+      observe(Object.getPrototypeOf(obj), prop);
+    }
+
+    function allRootObjNonObservedProps(recs) {
+      for (var i = 0; i < recs.length; i++) {
+        var rec = recs[i];
+        if (rec.object !== rootObj ||
+            rootObjProps[rec.name] ||
+            rec.type === 'setPrototype') {
+          return false;
+        }
+      }
+      return true;
+    }
+
+    function callback(recs) {
+      if (allRootObjNonObservedProps(recs))
+        return;
+
+      var observer;
+      for (var i = 0; i < observers.length; i++) {
+        observer = observers[i];
+        if (observer.state_ == OPENED) {
+          observer.iterateObjects_(observe);
+        }
+      }
+
+      for (var i = 0; i < observers.length; i++) {
+        observer = observers[i];
+        if (observer.state_ == OPENED) {
+          observer.check_();
+        }
+      }
+    }
+
+    var record = {
+      objects: objects,
+      get rootObject() { return rootObj; },
+      set rootObject(value) {
+        rootObj = value;
+        rootObjProps = {};
+      },
+      open: function(obs, object) {
+        observers.push(obs);
+        observerCount++;
+        obs.iterateObjects_(observe);
+      },
+      close: function(obs) {
+        observerCount--;
+        if (observerCount > 0) {
+          return;
+        }
+
+        for (var i = 0; i < objects.length; i++) {
+          Object.unobserve(objects[i], callback);
+          Observer.unobservedCount++;
+        }
+
+        observers.length = 0;
+        objects.length = 0;
+        rootObj = undefined;
+        rootObjProps = undefined;
+        observedSetCache.push(this);
+        if (lastObservedSet === this)
+          lastObservedSet = null;
+      },
+    };
+
+    return record;
+  }
+
+  var lastObservedSet;
+
+  function getObservedSet(observer, obj) {
+    if (!lastObservedSet || lastObservedSet.rootObject !== obj) {
+      lastObservedSet = observedSetCache.pop() || newObservedSet();
+      lastObservedSet.rootObject = obj;
+    }
+    lastObservedSet.open(observer, obj);
+    return lastObservedSet;
+  }
+
+  var UNOPENED = 0;
+  var OPENED = 1;
+  var CLOSED = 2;
+  var RESETTING = 3;
+
+  var nextObserverId = 1;
+
+  function Observer() {
+    this.state_ = UNOPENED;
+    this.callback_ = undefined;
+    this.target_ = undefined; // TODO(rafaelw): Should be WeakRef
+    this.directObserver_ = undefined;
+    this.value_ = undefined;
+    this.id_ = nextObserverId++;
+  }
+
+  Observer.prototype = {
+    open: function(callback, target) {
+      if (this.state_ != UNOPENED)
+        throw Error('Observer has already been opened.');
+
+      addToAll(this);
+      this.callback_ = callback;
+      this.target_ = target;
+      this.connect_();
+      this.state_ = OPENED;
+      return this.value_;
+    },
+
+    close: function() {
+      if (this.state_ != OPENED)
+        return;
+
+      removeFromAll(this);
+      this.disconnect_();
+      this.value_ = undefined;
+      this.callback_ = undefined;
+      this.target_ = undefined;
+      this.state_ = CLOSED;
+    },
+
+    deliver: function() {
+      if (this.state_ != OPENED)
+        return;
+
+      dirtyCheck(this);
+    },
+
+    report_: function(changes) {
+      try {
+        this.callback_.apply(this.target_, changes);
+      } catch (ex) {
+        Observer._errorThrownDuringCallback = true;
+        console.error('Exception caught during observer callback: ' +
+                       (ex.stack || ex));
+      }
+    },
+
+    discardChanges: function() {
+      this.check_(undefined, true);
+      return this.value_;
+    }
+  }
+
+  var collectObservers = !hasObserve;
+  var allObservers;
+  Observer._allObserversCount = 0;
+
+  if (collectObservers) {
+    allObservers = [];
+  }
+
+  function addToAll(observer) {
+    Observer._allObserversCount++;
+    if (!collectObservers)
+      return;
+
+    allObservers.push(observer);
+  }
+
+  function removeFromAll(observer) {
+    Observer._allObserversCount--;
+  }
+
+  var runningMicrotaskCheckpoint = false;
+
+  global.Platform = global.Platform || {};
+
+  global.Platform.performMicrotaskCheckpoint = function() {
+    if (runningMicrotaskCheckpoint)
+      return;
+
+    if (!collectObservers)
+      return;
+
+    runningMicrotaskCheckpoint = true;
+
+    var cycles = 0;
+    var anyChanged, toCheck;
+
+    do {
+      cycles++;
+      toCheck = allObservers;
+      allObservers = [];
+      anyChanged = false;
+
+      for (var i = 0; i < toCheck.length; i++) {
+        var observer = toCheck[i];
+        if (observer.state_ != OPENED)
+          continue;
+
+        if (observer.check_())
+          anyChanged = true;
+
+        allObservers.push(observer);
+      }
+      if (runEOMTasks())
+        anyChanged = true;
+    } while (cycles < MAX_DIRTY_CHECK_CYCLES && anyChanged);
+
+    if (testingExposeCycleCount)
+      global.dirtyCheckCycleCount = cycles;
+
+    runningMicrotaskCheckpoint = false;
+  };
+
+  if (collectObservers) {
+    global.Platform.clearObservers = function() {
+      allObservers = [];
+    };
+  }
+
+  function ObjectObserver(object) {
+    Observer.call(this);
+    this.value_ = object;
+    this.oldObject_ = undefined;
+  }
+
+  ObjectObserver.prototype = createObject({
+    __proto__: Observer.prototype,
+
+    arrayObserve: false,
+
+    connect_: function(callback, target) {
+      if (hasObserve) {
+        this.directObserver_ = getObservedObject(this, this.value_,
+                                                 this.arrayObserve);
+      } else {
+        this.oldObject_ = this.copyObject(this.value_);
+      }
+
+    },
+
+    copyObject: function(object) {
+      var copy = Array.isArray(object) ? [] : {};
+      for (var prop in object) {
+        copy[prop] = object[prop];
+      };
+      if (Array.isArray(object))
+        copy.length = object.length;
+      return copy;
+    },
+
+    check_: function(changeRecords, skipChanges) {
+      var diff;
+      var oldValues;
+      if (hasObserve) {
+        if (!changeRecords)
+          return false;
+
+        oldValues = {};
+        diff = diffObjectFromChangeRecords(this.value_, changeRecords,
+                                           oldValues);
+      } else {
+        oldValues = this.oldObject_;
+        diff = diffObjectFromOldObject(this.value_, this.oldObject_);
+      }
+
+      if (diffIsEmpty(diff))
+        return false;
+
+      if (!hasObserve)
+        this.oldObject_ = this.copyObject(this.value_);
+
+      this.report_([
+        diff.added || {},
+        diff.removed || {},
+        diff.changed || {},
+        function(property) {
+          return oldValues[property];
+        }
+      ]);
+
+      return true;
+    },
+
+    disconnect_: function() {
+      if (hasObserve) {
+        this.directObserver_.close();
+        this.directObserver_ = undefined;
+      } else {
+        this.oldObject_ = undefined;
+      }
+    },
+
+    deliver: function() {
+      if (this.state_ != OPENED)
+        return;
+
+      if (hasObserve)
+        this.directObserver_.deliver(false);
+      else
+        dirtyCheck(this);
+    },
+
+    discardChanges: function() {
+      if (this.directObserver_)
+        this.directObserver_.deliver(true);
+      else
+        this.oldObject_ = this.copyObject(this.value_);
+
+      return this.value_;
+    }
+  });
+
+  function ArrayObserver(array) {
+    if (!Array.isArray(array))
+      throw Error('Provided object is not an Array');
+    ObjectObserver.call(this, array);
+  }
+
+  ArrayObserver.prototype = createObject({
+
+    __proto__: ObjectObserver.prototype,
+
+    arrayObserve: true,
+
+    copyObject: function(arr) {
+      return arr.slice();
+    },
+
+    check_: function(changeRecords) {
+      var splices;
+      if (hasObserve) {
+        if (!changeRecords)
+          return false;
+        splices = projectArraySplices(this.value_, changeRecords);
+      } else {
+        splices = calcSplices(this.value_, 0, this.value_.length,
+                              this.oldObject_, 0, this.oldObject_.length);
+      }
+
+      if (!splices || !splices.length)
+        return false;
+
+      if (!hasObserve)
+        this.oldObject_ = this.copyObject(this.value_);
+
+      this.report_([splices]);
+      return true;
+    }
+  });
+
+  ArrayObserver.applySplices = function(previous, current, splices) {
+    splices.forEach(function(splice) {
+      var spliceArgs = [splice.index, splice.removed.length];
+      var addIndex = splice.index;
+      while (addIndex < splice.index + splice.addedCount) {
+        spliceArgs.push(current[addIndex]);
+        addIndex++;
+      }
+
+      Array.prototype.splice.apply(previous, spliceArgs);
+    });
+  };
+
+  function PathObserver(object, path) {
+    Observer.call(this);
+
+    this.object_ = object;
+    this.path_ = getPath(path);
+    this.directObserver_ = undefined;
+  }
+
+  PathObserver.prototype = createObject({
+    __proto__: Observer.prototype,
+
+    get path() {
+      return this.path_;
+    },
+
+    connect_: function() {
+      if (hasObserve)
+        this.directObserver_ = getObservedSet(this, this.object_);
+
+      this.check_(undefined, true);
+    },
+
+    disconnect_: function() {
+      this.value_ = undefined;
+
+      if (this.directObserver_) {
+        this.directObserver_.close(this);
+        this.directObserver_ = undefined;
+      }
+    },
+
+    iterateObjects_: function(observe) {
+      this.path_.iterateObjects(this.object_, observe);
+    },
+
+    check_: function(changeRecords, skipChanges) {
+      var oldValue = this.value_;
+      this.value_ = this.path_.getValueFrom(this.object_);
+      if (skipChanges || areSameValue(this.value_, oldValue))
+        return false;
+
+      this.report_([this.value_, oldValue, this]);
+      return true;
+    },
+
+    setValue: function(newValue) {
+      if (this.path_)
+        this.path_.setValueFrom(this.object_, newValue);
+    }
+  });
+
+  function CompoundObserver(reportChangesOnOpen) {
+    Observer.call(this);
+
+    this.reportChangesOnOpen_ = reportChangesOnOpen;
+    this.value_ = [];
+    this.directObserver_ = undefined;
+    this.observed_ = [];
+  }
+
+  var observerSentinel = {};
+
+  CompoundObserver.prototype = createObject({
+    __proto__: Observer.prototype,
+
+    connect_: function() {
+      if (hasObserve) {
+        var object;
+        var needsDirectObserver = false;
+        for (var i = 0; i < this.observed_.length; i += 2) {
+          object = this.observed_[i]
+          if (object !== observerSentinel) {
+            needsDirectObserver = true;
+            break;
+          }
+        }
+
+        if (needsDirectObserver)
+          this.directObserver_ = getObservedSet(this, object);
+      }
+
+      this.check_(undefined, !this.reportChangesOnOpen_);
+    },
+
+    disconnect_: function() {
+      for (var i = 0; i < this.observed_.length; i += 2) {
+        if (this.observed_[i] === observerSentinel)
+          this.observed_[i + 1].close();
+      }
+      this.observed_.length = 0;
+      this.value_.length = 0;
+
+      if (this.directObserver_) {
+        this.directObserver_.close(this);
+        this.directObserver_ = undefined;
+      }
+    },
+
+    addPath: function(object, path) {
+      if (this.state_ != UNOPENED && this.state_ != RESETTING)
+        throw Error('Cannot add paths once started.');
+
+      var path = getPath(path);
+      this.observed_.push(object, path);
+      if (!this.reportChangesOnOpen_)
+        return;
+      var index = this.observed_.length / 2 - 1;
+      this.value_[index] = path.getValueFrom(object);
+    },
+
+    addObserver: function(observer) {
+      if (this.state_ != UNOPENED && this.state_ != RESETTING)
+        throw Error('Cannot add observers once started.');
+
+      this.observed_.push(observerSentinel, observer);
+      if (!this.reportChangesOnOpen_)
+        return;
+      var index = this.observed_.length / 2 - 1;
+      this.value_[index] = observer.open(this.deliver, this);
+    },
+
+    startReset: function() {
+      if (this.state_ != OPENED)
+        throw Error('Can only reset while open');
+
+      this.state_ = RESETTING;
+      this.disconnect_();
+    },
+
+    finishReset: function() {
+      if (this.state_ != RESETTING)
+        throw Error('Can only finishReset after startReset');
+      this.state_ = OPENED;
+      this.connect_();
+
+      return this.value_;
+    },
+
+    iterateObjects_: function(observe) {
+      var object;
+      for (var i = 0; i < this.observed_.length; i += 2) {
+        object = this.observed_[i]
+        if (object !== observerSentinel)
+          this.observed_[i + 1].iterateObjects(object, observe)
+      }
+    },
+
+    check_: function(changeRecords, skipChanges) {
+      var oldValues;
+      for (var i = 0; i < this.observed_.length; i += 2) {
+        var object = this.observed_[i];
+        var path = this.observed_[i+1];
+        var value;
+        if (object === observerSentinel) {
+          var observable = path;
+          value = this.state_ === UNOPENED ?
+              observable.open(this.deliver, this) :
+              observable.discardChanges();
+        } else {
+          value = path.getValueFrom(object);
+        }
+
+        if (skipChanges) {
+          this.value_[i / 2] = value;
+          continue;
+        }
+
+        if (areSameValue(value, this.value_[i / 2]))
+          continue;
+
+        oldValues = oldValues || [];
+        oldValues[i / 2] = this.value_[i / 2];
+        this.value_[i / 2] = value;
+      }
+
+      if (!oldValues)
+        return false;
+
+      // TODO(rafaelw): Having observed_ as the third callback arg here is
+      // pretty lame API. Fix.
+      this.report_([this.value_, oldValues, this.observed_]);
+      return true;
+    }
+  });
+
+  function identFn(value) { return value; }
+
+  function ObserverTransform(observable, getValueFn, setValueFn,
+                             dontPassThroughSet) {
+    this.callback_ = undefined;
+    this.target_ = undefined;
+    this.value_ = undefined;
+    this.observable_ = observable;
+    this.getValueFn_ = getValueFn || identFn;
+    this.setValueFn_ = setValueFn || identFn;
+    // TODO(rafaelw): This is a temporary hack. PolymerExpressions needs this
+    // at the moment because of a bug in it's dependency tracking.
+    this.dontPassThroughSet_ = dontPassThroughSet;
+  }
+
+  ObserverTransform.prototype = {
+    open: function(callback, target) {
+      this.callback_ = callback;
+      this.target_ = target;
+      this.value_ =
+          this.getValueFn_(this.observable_.open(this.observedCallback_, this));
+      return this.value_;
+    },
+
+    observedCallback_: function(value) {
+      value = this.getValueFn_(value);
+      if (areSameValue(value, this.value_))
+        return;
+      var oldValue = this.value_;
+      this.value_ = value;
+      this.callback_.call(this.target_, this.value_, oldValue);
+    },
+
+    discardChanges: function() {
+      this.value_ = this.getValueFn_(this.observable_.discardChanges());
+      return this.value_;
+    },
+
+    deliver: function() {
+      return this.observable_.deliver();
+    },
+
+    setValue: function(value) {
+      value = this.setValueFn_(value);
+      if (!this.dontPassThroughSet_ && this.observable_.setValue)
+        return this.observable_.setValue(value);
+    },
+
+    close: function() {
+      if (this.observable_)
+        this.observable_.close();
+      this.callback_ = undefined;
+      this.target_ = undefined;
+      this.observable_ = undefined;
+      this.value_ = undefined;
+      this.getValueFn_ = undefined;
+      this.setValueFn_ = undefined;
+    }
+  }
+
+  var expectedRecordTypes = {
+    add: true,
+    update: true,
+    delete: true
+  };
+
+  function diffObjectFromChangeRecords(object, changeRecords, oldValues) {
+    var added = {};
+    var removed = {};
+
+    for (var i = 0; i < changeRecords.length; i++) {
+      var record = changeRecords[i];
+      if (!expectedRecordTypes[record.type]) {
+        console.error('Unknown changeRecord type: ' + record.type);
+        console.error(record);
+        continue;
+      }
+
+      if (!(record.name in oldValues))
+        oldValues[record.name] = record.oldValue;
+
+      if (record.type == 'update')
+        continue;
+
+      if (record.type == 'add') {
+        if (record.name in removed)
+          delete removed[record.name];
+        else
+          added[record.name] = true;
+
+        continue;
+      }
+
+      // type = 'delete'
+      if (record.name in added) {
+        delete added[record.name];
+        delete oldValues[record.name];
+      } else {
+        removed[record.name] = true;
+      }
+    }
+
+    for (var prop in added)
+      added[prop] = object[prop];
+
+    for (var prop in removed)
+      removed[prop] = undefined;
+
+    var changed = {};
+    for (var prop in oldValues) {
+      if (prop in added || prop in removed)
+        continue;
+
+      var newValue = object[prop];
+      if (oldValues[prop] !== newValue)
+        changed[prop] = newValue;
+    }
+
+    return {
+      added: added,
+      removed: removed,
+      changed: changed
+    };
+  }
+
+  function newSplice(index, removed, addedCount) {
+    return {
+      index: index,
+      removed: removed,
+      addedCount: addedCount
+    };
+  }
+
+  var EDIT_LEAVE = 0;
+  var EDIT_UPDATE = 1;
+  var EDIT_ADD = 2;
+  var EDIT_DELETE = 3;
+
+  function ArraySplice() {}
+
+  ArraySplice.prototype = {
+
+    // Note: This function is *based* on the computation of the Levenshtein
+    // "edit" distance. The one change is that "updates" are treated as two
+    // edits - not one. With Array splices, an update is really a delete
+    // followed by an add. By retaining this, we optimize for "keeping" the
+    // maximum array items in the original array. For example:
+    //
+    //   'xxxx123' -> '123yyyy'
+    //
+    // With 1-edit updates, the shortest path would be just to update all seven
+    // characters. With 2-edit updates, we delete 4, leave 3, and add 4. This
+    // leaves the substring '123' intact.
+    calcEditDistances: function(current, currentStart, currentEnd,
+                                old, oldStart, oldEnd) {
+      // "Deletion" columns
+      var rowCount = oldEnd - oldStart + 1;
+      var columnCount = currentEnd - currentStart + 1;
+      var distances = new Array(rowCount);
+
+      // "Addition" rows. Initialize null column.
+      for (var i = 0; i < rowCount; i++) {
+        distances[i] = new Array(columnCount);
+        distances[i][0] = i;
+      }
+
+      // Initialize null row
+      for (var j = 0; j < columnCount; j++)
+        distances[0][j] = j;
+
+      for (var i = 1; i < rowCount; i++) {
+        for (var j = 1; j < columnCount; j++) {
+          if (this.equals(current[currentStart + j - 1], old[oldStart + i - 1]))
+            distances[i][j] = distances[i - 1][j - 1];
+          else {
+            var north = distances[i - 1][j] + 1;
+            var west = distances[i][j - 1] + 1;
+            distances[i][j] = north < west ? north : west;
+          }
+        }
+      }
+
+      return distances;
+    },
+
+    // This starts at the final weight, and walks "backward" by finding
+    // the minimum previous weight recursively until the origin of the weight
+    // matrix.
+    spliceOperationsFromEditDistances: function(distances) {
+      var i = distances.length - 1;
+      var j = distances[0].length - 1;
+      var current = distances[i][j];
+      var edits = [];
+      while (i > 0 || j > 0) {
+        if (i == 0) {
+          edits.push(EDIT_ADD);
+          j--;
+          continue;
+        }
+        if (j == 0) {
+          edits.push(EDIT_DELETE);
+          i--;
+          continue;
+        }
+        var northWest = distances[i - 1][j - 1];
+        var west = distances[i - 1][j];
+        var north = distances[i][j - 1];
+
+        var min;
+        if (west < north)
+          min = west < northWest ? west : northWest;
+        else
+          min = north < northWest ? north : northWest;
+
+        if (min == northWest) {
+          if (northWest == current) {
+            edits.push(EDIT_LEAVE);
+          } else {
+            edits.push(EDIT_UPDATE);
+            current = northWest;
+          }
+          i--;
+          j--;
+        } else if (min == west) {
+          edits.push(EDIT_DELETE);
+          i--;
+          current = west;
+        } else {
+          edits.push(EDIT_ADD);
+          j--;
+          current = north;
+        }
+      }
+
+      edits.reverse();
+      return edits;
+    },
+
+    /**
+     * Splice Projection functions:
+     *
+     * A splice map is a representation of how a previous array of items
+     * was transformed into a new array of items. Conceptually it is a list of
+     * tuples of
+     *
+     *   <index, removed, addedCount>
+     *
+     * which are kept in ascending index order of. The tuple represents that at
+     * the |index|, |removed| sequence of items were removed, and counting forward
+     * from |index|, |addedCount| items were added.
+     */
+
+    /**
+     * Lacking individual splice mutation information, the minimal set of
+     * splices can be synthesized given the previous state and final state of an
+     * array. The basic approach is to calculate the edit distance matrix and
+     * choose the shortest path through it.
+     *
+     * Complexity: O(l * p)
+     *   l: The length of the current array
+     *   p: The length of the old array
+     */
+    calcSplices: function(current, currentStart, currentEnd,
+                          old, oldStart, oldEnd) {
+      var prefixCount = 0;
+      var suffixCount = 0;
+
+      var minLength = Math.min(currentEnd - currentStart, oldEnd - oldStart);
+      if (currentStart == 0 && oldStart == 0)
+        prefixCount = this.sharedPrefix(current, old, minLength);
+
+      if (currentEnd == current.length && oldEnd == old.length)
+        suffixCount = this.sharedSuffix(current, old, minLength - prefixCount);
+
+      currentStart += prefixCount;
+      oldStart += prefixCount;
+      currentEnd -= suffixCount;
+      oldEnd -= suffixCount;
+
+      if (currentEnd - currentStart == 0 && oldEnd - oldStart == 0)
+        return [];
+
+      if (currentStart == currentEnd) {
+        var splice = newSplice(currentStart, [], 0);
+        while (oldStart < oldEnd)
+          splice.removed.push(old[oldStart++]);
+
+        return [ splice ];
+      } else if (oldStart == oldEnd)
+        return [ newSplice(currentStart, [], currentEnd - currentStart) ];
+
+      var ops = this.spliceOperationsFromEditDistances(
+          this.calcEditDistances(current, currentStart, currentEnd,
+                                 old, oldStart, oldEnd));
+
+      var splice = undefined;
+      var splices = [];
+      var index = currentStart;
+      var oldIndex = oldStart;
+      for (var i = 0; i < ops.length; i++) {
+        switch(ops[i]) {
+          case EDIT_LEAVE:
+            if (splice) {
+              splices.push(splice);
+              splice = undefined;
+            }
+
+            index++;
+            oldIndex++;
+            break;
+          case EDIT_UPDATE:
+            if (!splice)
+              splice = newSplice(index, [], 0);
+
+            splice.addedCount++;
+            index++;
+
+            splice.removed.push(old[oldIndex]);
+            oldIndex++;
+            break;
+          case EDIT_ADD:
+            if (!splice)
+              splice = newSplice(index, [], 0);
+
+            splice.addedCount++;
+            index++;
+            break;
+          case EDIT_DELETE:
+            if (!splice)
+              splice = newSplice(index, [], 0);
+
+            splice.removed.push(old[oldIndex]);
+            oldIndex++;
+            break;
+        }
+      }
+
+      if (splice) {
+        splices.push(splice);
+      }
+      return splices;
+    },
+
+    sharedPrefix: function(current, old, searchLength) {
+      for (var i = 0; i < searchLength; i++)
+        if (!this.equals(current[i], old[i]))
+          return i;
+      return searchLength;
+    },
+
+    sharedSuffix: function(current, old, searchLength) {
+      var index1 = current.length;
+      var index2 = old.length;
+      var count = 0;
+      while (count < searchLength && this.equals(current[--index1], old[--index2]))
+        count++;
+
+      return count;
+    },
+
+    calculateSplices: function(current, previous) {
+      return this.calcSplices(current, 0, current.length, previous, 0,
+                              previous.length);
+    },
+
+    equals: function(currentValue, previousValue) {
+      return currentValue === previousValue;
+    }
+  };
+
+  var arraySplice = new ArraySplice();
+
+  function calcSplices(current, currentStart, currentEnd,
+                       old, oldStart, oldEnd) {
+    return arraySplice.calcSplices(current, currentStart, currentEnd,
+                                   old, oldStart, oldEnd);
+  }
+
+  function intersect(start1, end1, start2, end2) {
+    // Disjoint
+    if (end1 < start2 || end2 < start1)
+      return -1;
+
+    // Adjacent
+    if (end1 == start2 || end2 == start1)
+      return 0;
+
+    // Non-zero intersect, span1 first
+    if (start1 < start2) {
+      if (end1 < end2)
+        return end1 - start2; // Overlap
+      else
+        return end2 - start2; // Contained
+    } else {
+      // Non-zero intersect, span2 first
+      if (end2 < end1)
+        return end2 - start1; // Overlap
+      else
+        return end1 - start1; // Contained
+    }
+  }
+
+  function mergeSplice(splices, index, removed, addedCount) {
+
+    var splice = newSplice(index, removed, addedCount);
+
+    var inserted = false;
+    var insertionOffset = 0;
+
+    for (var i = 0; i < splices.length; i++) {
+      var current = splices[i];
+      current.index += insertionOffset;
+
+      if (inserted)
+        continue;
+
+      var intersectCount = intersect(splice.index,
+                                     splice.index + splice.removed.length,
+                                     current.index,
+                                     current.index + current.addedCount);
+
+      if (intersectCount >= 0) {
+        // Merge the two splices
+
+        splices.splice(i, 1);
+        i--;
+
+        insertionOffset -= current.addedCount - current.removed.length;
+
+        splice.addedCount += current.addedCount - intersectCount;
+        var deleteCount = splice.removed.length +
+                          current.removed.length - intersectCount;
+
+        if (!splice.addedCount && !deleteCount) {
+          // merged splice is a noop. discard.
+          inserted = true;
+        } else {
+          var removed = current.removed;
+
+          if (splice.index < current.index) {
+            // some prefix of splice.removed is prepended to current.removed.
+            var prepend = splice.removed.slice(0, current.index - splice.index);
+            Array.prototype.push.apply(prepend, removed);
+            removed = prepend;
+          }
+
+          if (splice.index + splice.removed.length > current.index + current.addedCount) {
+            // some suffix of splice.removed is appended to current.removed.
+            var append = splice.removed.slice(current.index + current.addedCount - splice.index);
+            Array.prototype.push.apply(removed, append);
+          }
+
+          splice.removed = removed;
+          if (current.index < splice.index) {
+            splice.index = current.index;
+          }
+        }
+      } else if (splice.index < current.index) {
+        // Insert splice here.
+
+        inserted = true;
+
+        splices.splice(i, 0, splice);
+        i++;
+
+        var offset = splice.addedCount - splice.removed.length
+        current.index += offset;
+        insertionOffset += offset;
+      }
+    }
+
+    if (!inserted)
+      splices.push(splice);
+  }
+
+  function createInitialSplices(array, changeRecords) {
+    var splices = [];
+
+    for (var i = 0; i < changeRecords.length; i++) {
+      var record = changeRecords[i];
+      switch(record.type) {
+        case 'splice':
+          mergeSplice(splices, record.index, record.removed.slice(), record.addedCount);
+          break;
+        case 'add':
+        case 'update':
+        case 'delete':
+          if (!isIndex(record.name))
+            continue;
+          var index = toNumber(record.name);
+          if (index < 0)
+            continue;
+          mergeSplice(splices, index, [record.oldValue], 1);
+          break;
+        default:
+          console.error('Unexpected record type: ' + JSON.stringify(record));
+          break;
+      }
+    }
+
+    return splices;
+  }
+
+  function projectArraySplices(array, changeRecords) {
+    var splices = [];
+
+    createInitialSplices(array, changeRecords).forEach(function(splice) {
+      if (splice.addedCount == 1 && splice.removed.length == 1) {
+        if (splice.removed[0] !== array[splice.index])
+          splices.push(splice);
+
+        return
+      };
+
+      splices = splices.concat(calcSplices(array, splice.index, splice.index + splice.addedCount,
+                                           splice.removed, 0, splice.removed.length));
+    });
+
+    return splices;
+  }
+
+  // Export the observe-js object for **Node.js**, with
+  // backwards-compatibility for the old `require()` API. If we're in
+  // the browser, export as a global object.
+
+  var expose = global;
+
+  if (typeof exports !== 'undefined') {
+    if (typeof module !== 'undefined' && module.exports) {
+      expose = exports = module.exports;
+    }
+    expose = exports;
+  } 
+
+  expose.Observer = Observer;
+  expose.Observer.runEOM_ = runEOM;
+  expose.Observer.observerSentinel_ = observerSentinel; // for testing.
+  expose.Observer.hasObjectObserve = hasObserve;
+  expose.ArrayObserver = ArrayObserver;
+  expose.ArrayObserver.calculateSplices = function(current, previous) {
+    return arraySplice.calculateSplices(current, previous);
+  };
+
+  expose.ArraySplice = ArraySplice;
+  expose.ObjectObserver = ObjectObserver;
+  expose.PathObserver = PathObserver;
+  expose.CompoundObserver = CompoundObserver;
+  expose.Path = Path;
+  expose.ObserverTransform = ObserverTransform;
+  
+})(typeof global !== 'undefined' && global && typeof module !== 'undefined' && module ? global : this || window);
+
+// Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
+// This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+// The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+// The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+// Code distributed by Google as part of the polymer project is also
+// subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+
+(function(global) {
+  'use strict';
+
+  var filter = Array.prototype.filter.call.bind(Array.prototype.filter);
+
+  function getTreeScope(node) {
+    while (node.parentNode) {
+      node = node.parentNode;
+    }
+
+    return typeof node.getElementById === 'function' ? node : null;
+  }
+
+  Node.prototype.bind = function(name, observable) {
+    console.error('Unhandled binding to Node: ', this, name, observable);
+  };
+
+  Node.prototype.bindFinished = function() {};
+
+  function updateBindings(node, name, binding) {
+    var bindings = node.bindings_;
+    if (!bindings)
+      bindings = node.bindings_ = {};
+
+    if (bindings[name])
+      binding[name].close();
+
+    return bindings[name] = binding;
+  }
+
+  function returnBinding(node, name, binding) {
+    return binding;
+  }
+
+  function sanitizeValue(value) {
+    return value == null ? '' : value;
+  }
+
+  function updateText(node, value) {
+    node.data = sanitizeValue(value);
+  }
+
+  function textBinding(node) {
+    return function(value) {
+      return updateText(node, value);
+    };
+  }
+
+  var maybeUpdateBindings = returnBinding;
+
+  Object.defineProperty(Platform, 'enableBindingsReflection', {
+    get: function() {
+      return maybeUpdateBindings === updateBindings;
+    },
+    set: function(enable) {
+      maybeUpdateBindings = enable ? updateBindings : returnBinding;
+      return enable;
+    },
+    configurable: true
+  });
+
+  Text.prototype.bind = function(name, value, oneTime) {
+    if (name !== 'textContent')
+      return Node.prototype.bind.call(this, name, value, oneTime);
+
+    if (oneTime)
+      return updateText(this, value);
+
+    var observable = value;
+    updateText(this, observable.open(textBinding(this)));
+    return maybeUpdateBindings(this, name, observable);
+  }
+
+  function updateAttribute(el, name, conditional, value) {
+    if (conditional) {
+      if (value)
+        el.setAttribute(name, '');
+      else
+        el.removeAttribute(name);
+      return;
+    }
+
+    el.setAttribute(name, sanitizeValue(value));
+  }
+
+  function attributeBinding(el, name, conditional) {
+    return function(value) {
+      updateAttribute(el, name, conditional, value);
+    };
+  }
+
+  Element.prototype.bind = function(name, value, oneTime) {
+    var conditional = name[name.length - 1] == '?';
+    if (conditional) {
+      this.removeAttribute(name);
+      name = name.slice(0, -1);
+    }
+
+    if (oneTime)
+      return updateAttribute(this, name, conditional, value);
+
+
+    var observable = value;
+    updateAttribute(this, name, conditional,
+        observable.open(attributeBinding(this, name, conditional)));
+
+    return maybeUpdateBindings(this, name, observable);
+  };
+
+  var checkboxEventType;
+  (function() {
+    // Attempt to feature-detect which event (change or click) is fired first
+    // for checkboxes.
+    var div = document.createElement('div');
+    var checkbox = div.appendChild(document.createElement('input'));
+    checkbox.setAttribute('type', 'checkbox');
+    var first;
+    var count = 0;
+    checkbox.addEventListener('click', function(e) {
+      count++;
+      first = first || 'click';
+    });
+    checkbox.addEventListener('change', function() {
+      count++;
+      first = first || 'change';
+    });
+
+    var event = document.createEvent('MouseEvent');
+    event.initMouseEvent("click", true, true, window, 0, 0, 0, 0, 0, false,
+        false, false, false, 0, null);
+    checkbox.dispatchEvent(event);
+    // WebKit/Blink don't fire the change event if the element is outside the
+    // document, so assume 'change' for that case.
+    checkboxEventType = count == 1 ? 'change' : first;
+  })();
+
+  function getEventForInputType(element) {
+    switch (element.type) {
+      case 'checkbox':
+        return checkboxEventType;
+      case 'radio':
+      case 'select-multiple':
+      case 'select-one':
+        return 'change';
+      case 'range':
+        if (/Trident|MSIE/.test(navigator.userAgent))
+          return 'change';
+      default:
+        return 'input';
+    }
+  }
+
+  function updateInput(input, property, value, santizeFn) {
+    input[property] = (santizeFn || sanitizeValue)(value);
+  }
+
+  function inputBinding(input, property, santizeFn) {
+    return function(value) {
+      return updateInput(input, property, value, santizeFn);
+    }
+  }
+
+  function noop() {}
+
+  function bindInputEvent(input, property, observable, postEventFn) {
+    var eventType = getEventForInputType(input);
+
+    function eventHandler() {
+      observable.setValue(input[property]);
+      observable.discardChanges();
+      (postEventFn || noop)(input);
+      Platform.performMicrotaskCheckpoint();
+    }
+    input.addEventListener(eventType, eventHandler);
+
+    return {
+      close: function() {
+        input.removeEventListener(eventType, eventHandler);
+        observable.close();
+      },
+
+      observable_: observable
+    }
+  }
+
+  function booleanSanitize(value) {
+    return Boolean(value);
+  }
+
+  // |element| is assumed to be an HTMLInputElement with |type| == 'radio'.
+  // Returns an array containing all radio buttons other than |element| that
+  // have the same |name|, either in the form that |element| belongs to or,
+  // if no form, in the document tree to which |element| belongs.
+  //
+  // This implementation is based upon the HTML spec definition of a
+  // "radio button group":
+  //   http://www.whatwg.org/specs/web-apps/current-work/multipage/number-state.html#radio-button-group
+  //
+  function getAssociatedRadioButtons(element) {
+    if (element.form) {
+      return filter(element.form.elements, function(el) {
+        return el != element &&
+            el.tagName == 'INPUT' &&
+            el.type == 'radio' &&
+            el.name == element.name;
+      });
+    } else {
+      var treeScope = getTreeScope(element);
+      if (!treeScope)
+        return [];
+      var radios = treeScope.querySelectorAll(
+          'input[type="radio"][name="' + element.name + '"]');
+      return filter(radios, function(el) {
+        return el != element && !el.form;
+      });
+    }
+  }
+
+  function checkedPostEvent(input) {
+    // Only the radio button that is getting checked gets an event. We
+    // therefore find all the associated radio buttons and update their
+    // check binding manually.
+    if (input.tagName === 'INPUT' &&
+        input.type === 'radio') {
+      getAssociatedRadioButtons(input).forEach(function(radio) {
+        var checkedBinding = radio.bindings_.checked;
+        if (checkedBinding) {
+          // Set the value directly to avoid an infinite call stack.
+          checkedBinding.observable_.setValue(false);
+        }
+      });
+    }
+  }
+
+  HTMLInputElement.prototype.bind = function(name, value, oneTime) {
+    if (name !== 'value' && name !== 'checked')
+      return HTMLElement.prototype.bind.call(this, name, value, oneTime);
+
+    this.removeAttribute(name);
+    var sanitizeFn = name == 'checked' ? booleanSanitize : sanitizeValue;
+    var postEventFn = name == 'checked' ? checkedPostEvent : noop;
+
+    if (oneTime)
+      return updateInput(this, name, value, sanitizeFn);
+
+
+    var observable = value;
+    var binding = bindInputEvent(this, name, observable, postEventFn);
+    updateInput(this, name,
+                observable.open(inputBinding(this, name, sanitizeFn)),
+                sanitizeFn);
+
+    // Checkboxes may need to update bindings of other checkboxes.
+    return updateBindings(this, name, binding);
+  }
+
+  HTMLTextAreaElement.prototype.bind = function(name, value, oneTime) {
+    if (name !== 'value')
+      return HTMLElement.prototype.bind.call(this, name, value, oneTime);
+
+    this.removeAttribute('value');
+
+    if (oneTime)
+      return updateInput(this, 'value', value);
+
+    var observable = value;
+    var binding = bindInputEvent(this, 'value', observable);
+    updateInput(this, 'value',
+                observable.open(inputBinding(this, 'value', sanitizeValue)));
+    return maybeUpdateBindings(this, name, binding);
+  }
+
+  function updateOption(option, value) {
+    var parentNode = option.parentNode;;
+    var select;
+    var selectBinding;
+    var oldValue;
+    if (parentNode instanceof HTMLSelectElement &&
+        parentNode.bindings_ &&
+        parentNode.bindings_.value) {
+      select = parentNode;
+      selectBinding = select.bindings_.value;
+      oldValue = select.value;
+    }
+
+    option.value = sanitizeValue(value);
+
+    if (select && select.value != oldValue) {
+      selectBinding.observable_.setValue(select.value);
+      selectBinding.observable_.discardChanges();
+      Platform.performMicrotaskCheckpoint();
+    }
+  }
+
+  function optionBinding(option) {
+    return function(value) {
+      updateOption(option, value);
+    }
+  }
+
+  HTMLOptionElement.prototype.bind = function(name, value, oneTime) {
+    if (name !== 'value')
+      return HTMLElement.prototype.bind.call(this, name, value, oneTime);
+
+    this.removeAttribute('value');
+
+    if (oneTime)
+      return updateOption(this, value);
+
+    var observable = value;
+    var binding = bindInputEvent(this, 'value', observable);
+    updateOption(this, observable.open(optionBinding(this)));
+    return maybeUpdateBindings(this, name, binding);
+  }
+
+  HTMLSelectElement.prototype.bind = function(name, value, oneTime) {
+    if (name === 'selectedindex')
+      name = 'selectedIndex';
+
+    if (name !== 'selectedIndex' && name !== 'value')
+      return HTMLElement.prototype.bind.call(this, name, value, oneTime);
+
+    this.removeAttribute(name);
+
+    if (oneTime)
+      return updateInput(this, name, value);
+
+    var observable = value;
+    var binding = bindInputEvent(this, name, observable);
+    updateInput(this, name,
+                observable.open(inputBinding(this, name)));
+
+    // Option update events may need to access select bindings.
+    return updateBindings(this, name, binding);
+  }
+})(this);
+
+// Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
+// This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+// The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+// The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+// Code distributed by Google as part of the polymer project is also
+// subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+
+(function(global) {
+  'use strict';
+
+  function assert(v) {
+    if (!v)
+      throw new Error('Assertion failed');
+  }
+
+  var forEach = Array.prototype.forEach.call.bind(Array.prototype.forEach);
+
+  function getFragmentRoot(node) {
+    var p;
+    while (p = node.parentNode) {
+      node = p;
+    }
+
+    return node;
+  }
+
+  function searchRefId(node, id) {
+    if (!id)
+      return;
+
+    var ref;
+    var selector = '#' + id;
+    while (!ref) {
+      node = getFragmentRoot(node);
+
+      if (node.protoContent_)
+        ref = node.protoContent_.querySelector(selector);
+      else if (node.getElementById)
+        ref = node.getElementById(id);
+
+      if (ref || !node.templateCreator_)
+        break
+
+      node = node.templateCreator_;
+    }
+
+    return ref;
+  }
+
+  function getInstanceRoot(node) {
+    while (node.parentNode) {
+      node = node.parentNode;
+    }
+    return node.templateCreator_ ? node : null;
+  }
+
+  var Map;
+  if (global.Map && typeof global.Map.prototype.forEach === 'function') {
+    Map = global.Map;
+  } else {
+    Map = function() {
+      this.keys = [];
+      this.values = [];
+    };
+
+    Map.prototype = {
+      set: function(key, value) {
+        var index = this.keys.indexOf(key);
+        if (index < 0) {
+          this.keys.push(key);
+          this.values.push(value);
+        } else {
+          this.values[index] = value;
+        }
+      },
+
+      get: function(key) {
+        var index = this.keys.indexOf(key);
+        if (index < 0)
+          return;
+
+        return this.values[index];
+      },
+
+      delete: function(key, value) {
+        var index = this.keys.indexOf(key);
+        if (index < 0)
+          return false;
+
+        this.keys.splice(index, 1);
+        this.values.splice(index, 1);
+        return true;
+      },
+
+      forEach: function(f, opt_this) {
+        for (var i = 0; i < this.keys.length; i++)
+          f.call(opt_this || this, this.values[i], this.keys[i], this);
+      }
+    };
+  }
+
+  // JScript does not have __proto__. We wrap all object literals with
+  // createObject which uses Object.create, Object.defineProperty and
+  // Object.getOwnPropertyDescriptor to create a new object that does the exact
+  // same thing. The main downside to this solution is that we have to extract
+  // all those property descriptors for IE.
+  var createObject = ('__proto__' in {}) ?
+      function(obj) { return obj; } :
+      function(obj) {
+        var proto = obj.__proto__;
+        if (!proto)
+          return obj;
+        var newObject = Object.create(proto);
+        Object.getOwnPropertyNames(obj).forEach(function(name) {
+          Object.defineProperty(newObject, name,
+                               Object.getOwnPropertyDescriptor(obj, name));
+        });
+        return newObject;
+      };
+
+  // IE does not support have Document.prototype.contains.
+  if (typeof document.contains != 'function') {
+    Document.prototype.contains = function(node) {
+      if (node === this || node.parentNode === this)
+        return true;
+      return this.documentElement.contains(node);
+    }
+  }
+
+  var BIND = 'bind';
+  var REPEAT = 'repeat';
+  var IF = 'if';
+
+  var templateAttributeDirectives = {
+    'template': true,
+    'repeat': true,
+    'bind': true,
+    'ref': true
+  };
+
+  var semanticTemplateElements = {
+    'THEAD': true,
+    'TBODY': true,
+    'TFOOT': true,
+    'TH': true,
+    'TR': true,
+    'TD': true,
+    'COLGROUP': true,
+    'COL': true,
+    'CAPTION': true,
+    'OPTION': true,
+    'OPTGROUP': true
+  };
+
+  var hasTemplateElement = typeof HTMLTemplateElement !== 'undefined';
+  if (hasTemplateElement) {
+    // TODO(rafaelw): Remove when fix for
+    // https://codereview.chromium.org/164803002/
+    // makes it to Chrome release.
+    (function() {
+      var t = document.createElement('template');
+      var d = t.content.ownerDocument;
+      var html = d.appendChild(d.createElement('html'));
+      var head = html.appendChild(d.createElement('head'));
+      var base = d.createElement('base');
+      base.href = document.baseURI;
+      head.appendChild(base);
+    })();
+  }
+
+  var allTemplatesSelectors = 'template, ' +
+      Object.keys(semanticTemplateElements).map(function(tagName) {
+        return tagName.toLowerCase() + '[template]';
+      }).join(', ');
+
+  function isSVGTemplate(el) {
+    return el.tagName == 'template' &&
+           el.namespaceURI == 'http://www.w3.org/2000/svg';
+  }
+
+  function isHTMLTemplate(el) {
+    return el.tagName == 'TEMPLATE' &&
+           el.namespaceURI == 'http://www.w3.org/1999/xhtml';
+  }
+
+  function isAttributeTemplate(el) {
+    return Boolean(semanticTemplateElements[el.tagName] &&
+                   el.hasAttribute('template'));
+  }
+
+  function isTemplate(el) {
+    if (el.isTemplate_ === undefined)
+      el.isTemplate_ = el.tagName == 'TEMPLATE' || isAttributeTemplate(el);
+
+    return el.isTemplate_;
+  }
+
+  // FIXME: Observe templates being added/removed from documents
+  // FIXME: Expose imperative API to decorate and observe templates in
+  // "disconnected tress" (e.g. ShadowRoot)
+  document.addEventListener('DOMContentLoaded', function(e) {
+    bootstrapTemplatesRecursivelyFrom(document);
+    // FIXME: Is this needed? Seems like it shouldn't be.
+    Platform.performMicrotaskCheckpoint();
+  }, false);
+
+  function forAllTemplatesFrom(node, fn) {
+    var subTemplates = node.querySelectorAll(allTemplatesSelectors);
+
+    if (isTemplate(node))
+      fn(node)
+    forEach(subTemplates, fn);
+  }
+
+  function bootstrapTemplatesRecursivelyFrom(node) {
+    function bootstrap(template) {
+      if (!HTMLTemplateElement.decorate(template))
+        bootstrapTemplatesRecursivelyFrom(template.content);
+    }
+
+    forAllTemplatesFrom(node, bootstrap);
+  }
+
+  if (!hasTemplateElement) {
+    /**
+     * This represents a <template> element.
+     * @constructor
+     * @extends {HTMLElement}
+     */
+    global.HTMLTemplateElement = function() {
+      throw TypeError('Illegal constructor');
+    };
+  }
+
+  var hasProto = '__proto__' in {};
+
+  function mixin(to, from) {
+    Object.getOwnPropertyNames(from).forEach(function(name) {
+      Object.defineProperty(to, name,
+                            Object.getOwnPropertyDescriptor(from, name));
+    });
+  }
+
+  // http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/templates/index.html#dfn-template-contents-owner
+  function getOrCreateTemplateContentsOwner(template) {
+    var doc = template.ownerDocument
+    if (!doc.defaultView)
+      return doc;
+    var d = doc.templateContentsOwner_;
+    if (!d) {
+      // TODO(arv): This should either be a Document or HTMLDocument depending
+      // on doc.
+      d = doc.implementation.createHTMLDocument('');
+      while (d.lastChild) {
+        d.removeChild(d.lastChild);
+      }
+      doc.templateContentsOwner_ = d;
+    }
+    return d;
+  }
+
+  function getTemplateStagingDocument(template) {
+    if (!template.stagingDocument_) {
+      var owner = template.ownerDocument;
+      if (!owner.stagingDocument_) {
+        owner.stagingDocument_ = owner.implementation.createHTMLDocument('');
+        owner.stagingDocument_.isStagingDocument = true;
+        // TODO(rafaelw): Remove when fix for
+        // https://codereview.chromium.org/164803002/
+        // makes it to Chrome release.
+        var base = owner.stagingDocument_.createElement('base');
+        base.href = document.baseURI;
+        owner.stagingDocument_.head.appendChild(base);
+
+        owner.stagingDocument_.stagingDocument_ = owner.stagingDocument_;
+      }
+
+      template.stagingDocument_ = owner.stagingDocument_;
+    }
+
+    return template.stagingDocument_;
+  }
+
+  // For non-template browsers, the parser will disallow <template> in certain
+  // locations, so we allow "attribute templates" which combine the template
+  // element with the top-level container node of the content, e.g.
+  //
+  //   <tr template repeat="{{ foo }}"" class="bar"><td>Bar</td></tr>
+  //
+  // becomes
+  //
+  //   <template repeat="{{ foo }}">
+  //   + #document-fragment
+  //     + <tr class="bar">
+  //       + <td>Bar</td>
+  //
+  function extractTemplateFromAttributeTemplate(el) {
+    var template = el.ownerDocument.createElement('template');
+    el.parentNode.insertBefore(template, el);
+
+    var attribs = el.attributes;
+    var count = attribs.length;
+    while (count-- > 0) {
+      var attrib = attribs[count];
+      if (templateAttributeDirectives[attrib.name]) {
+        if (attrib.name !== 'template')
+          template.setAttribute(attrib.name, attrib.value);
+        el.removeAttribute(attrib.name);
+      }
+    }
+
+    return template;
+  }
+
+  function extractTemplateFromSVGTemplate(el) {
+    var template = el.ownerDocument.createElement('template');
+    el.parentNode.insertBefore(template, el);
+
+    var attribs = el.attributes;
+    var count = attribs.length;
+    while (count-- > 0) {
+      var attrib = attribs[count];
+      template.setAttribute(attrib.name, attrib.value);
+      el.removeAttribute(attrib.name);
+    }
+
+    el.parentNode.removeChild(el);
+    return template;
+  }
+
+  function liftNonNativeTemplateChildrenIntoContent(template, el, useRoot) {
+    var content = template.content;
+    if (useRoot) {
+      content.appendChild(el);
+      return;
+    }
+
+    var child;
+    while (child = el.firstChild) {
+      content.appendChild(child);
+    }
+  }
+
+  var templateObserver;
+  if (typeof MutationObserver == 'function') {
+    templateObserver = new MutationObserver(function(records) {
+      for (var i = 0; i < records.length; i++) {
+        records[i].target.refChanged_();
+      }
+    });
+  }
+
+  /**
+   * Ensures proper API and content model for template elements.
+   * @param {HTMLTemplateElement} opt_instanceRef The template element which
+   *     |el| template element will return as the value of its ref(), and whose
+   *     content will be used as source when createInstance() is invoked.
+   */
+  HTMLTemplateElement.decorate = function(el, opt_instanceRef) {
+    if (el.templateIsDecorated_)
+      return false;
+
+    var templateElement = el;
+    templateElement.templateIsDecorated_ = true;
+
+    var isNativeHTMLTemplate = isHTMLTemplate(templateElement) &&
+                               hasTemplateElement;
+    var bootstrapContents = isNativeHTMLTemplate;
+    var liftContents = !isNativeHTMLTemplate;
+    var liftRoot = false;
+
+    if (!isNativeHTMLTemplate) {
+      if (isAttributeTemplate(templateElement)) {
+        assert(!opt_instanceRef);
+        templateElement = extractTemplateFromAttributeTemplate(el);
+        templateElement.templateIsDecorated_ = true;
+        isNativeHTMLTemplate = hasTemplateElement;
+        liftRoot = true;
+      } else if (isSVGTemplate(templateElement)) {
+        templateElement = extractTemplateFromSVGTemplate(el);
+        templateElement.templateIsDecorated_ = true;
+        isNativeHTMLTemplate = hasTemplateElement;
+      }
+    }
+
+    if (!isNativeHTMLTemplate) {
+      fixTemplateElementPrototype(templateElement);
+      var doc = getOrCreateTemplateContentsOwner(templateElement);
+      templateElement.content_ = doc.createDocumentFragment();
+    }
+
+    if (opt_instanceRef) {
+      // template is contained within an instance, its direct content must be
+      // empty
+      templateElement.instanceRef_ = opt_instanceRef;
+    } else if (liftContents) {
+      liftNonNativeTemplateChildrenIntoContent(templateElement,
+                                               el,
+                                               liftRoot);
+    } else if (bootstrapContents) {
+      bootstrapTemplatesRecursivelyFrom(templateElement.content);
+    }
+
+    return true;
+  };
+
+  // TODO(rafaelw): This used to decorate recursively all templates from a given
+  // node. This happens by default on 'DOMContentLoaded', but may be needed
+  // in subtrees not descendent from document (e.g. ShadowRoot).
+  // Review whether this is the right public API.
+  HTMLTemplateElement.bootstrap = bootstrapTemplatesRecursivelyFrom;
+
+  var htmlElement = global.HTMLUnknownElement || HTMLElement;
+
+  var contentDescriptor = {
+    get: function() {
+      return this.content_;
+    },
+    enumerable: true,
+    configurable: true
+  };
+
+  if (!hasTemplateElement) {
+    // Gecko is more picky with the prototype than WebKit. Make sure to use the
+    // same prototype as created in the constructor.
+    HTMLTemplateElement.prototype = Object.create(htmlElement.prototype);
+
+    Object.defineProperty(HTMLTemplateElement.prototype, 'content',
+                          contentDescriptor);
+  }
+
+  function fixTemplateElementPrototype(el) {
+    if (hasProto)
+      el.__proto__ = HTMLTemplateElement.prototype;
+    else
+      mixin(el, HTMLTemplateElement.prototype);
+  }
+
+  function ensureSetModelScheduled(template) {
+    if (!template.setModelFn_) {
+      template.setModelFn_ = function() {
+        template.setModelFnScheduled_ = false;
+        var map = getBindings(template,
+            template.delegate_ && template.delegate_.prepareBinding);
+        processBindings(template, map, template.model_);
+      };
+    }
+
+    if (!template.setModelFnScheduled_) {
+      template.setModelFnScheduled_ = true;
+      Observer.runEOM_(template.setModelFn_);
+    }
+  }
+
+  mixin(HTMLTemplateElement.prototype, {
+    bind: function(name, value, oneTime) {
+      if (name != 'ref')
+        return Element.prototype.bind.call(this, name, value, oneTime);
+
+      var self = this;
+      var ref = oneTime ? value : value.open(function(ref) {
+        self.setAttribute('ref', ref);
+        self.refChanged_();
+      });
+
+      this.setAttribute('ref', ref);
+      this.refChanged_();
+      if (oneTime)
+        return;
+
+      if (!this.bindings_) {
+        this.bindings_ = { ref: value };
+      } else {
+        this.bindings_.ref = value;
+      }
+
+      return value;
+    },
+
+    processBindingDirectives_: function(directives) {
+      if (this.iterator_)
+        this.iterator_.closeDeps();
+
+      if (!directives.if && !directives.bind && !directives.repeat) {
+        if (this.iterator_) {
+          this.iterator_.close();
+          this.iterator_ = undefined;
+        }
+
+        return;
+      }
+
+      if (!this.iterator_) {
+        this.iterator_ = new TemplateIterator(this);
+      }
+
+      this.iterator_.updateDependencies(directives, this.model_);
+
+      if (templateObserver) {
+        templateObserver.observe(this, { attributes: true,
+                                         attributeFilter: ['ref'] });
+      }
+
+      return this.iterator_;
+    },
+
+    createInstance: function(model, bindingDelegate, delegate_) {
+      if (bindingDelegate)
+        delegate_ = this.newDelegate_(bindingDelegate);
+      else if (!delegate_)
+        delegate_ = this.delegate_;
+
+      if (!this.refContent_)
+        this.refContent_ = this.ref_.content;
+      var content = this.refContent_;
+      if (content.firstChild === null)
+        return emptyInstance;
+
+      var map = getInstanceBindingMap(content, delegate_);
+      var stagingDocument = getTemplateStagingDocument(this);
+      var instance = stagingDocument.createDocumentFragment();
+      instance.templateCreator_ = this;
+      instance.protoContent_ = content;
+      instance.bindings_ = [];
+      instance.terminator_ = null;
+      var instanceRecord = instance.templateInstance_ = {
+        firstNode: null,
+        lastNode: null,
+        model: model
+      };
+
+      var i = 0;
+      var collectTerminator = false;
+      for (var child = content.firstChild; child; child = child.nextSibling) {
+        // The terminator of the instance is the clone of the last child of the
+        // content. If the last child is an active template, it may produce
+        // instances as a result of production, so simply collecting the last
+        // child of the instance after it has finished producing may be wrong.
+        if (child.nextSibling === null)
+          collectTerminator = true;
+
+        var clone = cloneAndBindInstance(child, instance, stagingDocument,
+                                         map.children[i++],
+                                         model,
+                                         delegate_,
+                                         instance.bindings_);
+        clone.templateInstance_ = instanceRecord;
+        if (collectTerminator)
+          instance.terminator_ = clone;
+      }
+
+      instanceRecord.firstNode = instance.firstChild;
+      instanceRecord.lastNode = instance.lastChild;
+      instance.templateCreator_ = undefined;
+      instance.protoContent_ = undefined;
+      return instance;
+    },
+
+    get model() {
+      return this.model_;
+    },
+
+    set model(model) {
+      this.model_ = model;
+      ensureSetModelScheduled(this);
+    },
+
+    get bindingDelegate() {
+      return this.delegate_ && this.delegate_.raw;
+    },
+
+    refChanged_: function() {
+      if (!this.iterator_ || this.refContent_ === this.ref_.content)
+        return;
+
+      this.refContent_ = undefined;
+      this.iterator_.valueChanged();
+      this.iterator_.updateIteratedValue(this.iterator_.getUpdatedValue());
+    },
+
+    clear: function() {
+      this.model_ = undefined;
+      this.delegate_ = undefined;
+      if (this.bindings_ && this.bindings_.ref)
+        this.bindings_.ref.close()
+      this.refContent_ = undefined;
+      if (!this.iterator_)
+        return;
+      this.iterator_.valueChanged();
+      this.iterator_.close()
+      this.iterator_ = undefined;
+    },
+
+    setDelegate_: function(delegate) {
+      this.delegate_ = delegate;
+      this.bindingMap_ = undefined;
+      if (this.iterator_) {
+        this.iterator_.instancePositionChangedFn_ = undefined;
+        this.iterator_.instanceModelFn_ = undefined;
+      }
+    },
+
+    newDelegate_: function(bindingDelegate) {
+      if (!bindingDelegate)
+        return;
+
+      function delegateFn(name) {
+        var fn = bindingDelegate && bindingDelegate[name];
+        if (typeof fn != 'function')
+          return;
+
+        return function() {
+          return fn.apply(bindingDelegate, arguments);
+        };
+      }
+
+      return {
+        bindingMaps: {},
+        raw: bindingDelegate,
+        prepareBinding: delegateFn('prepareBinding'),
+        prepareInstanceModel: delegateFn('prepareInstanceModel'),
+        prepareInstancePositionChanged:
+            delegateFn('prepareInstancePositionChanged')
+      };
+    },
+
+    set bindingDelegate(bindingDelegate) {
+      if (this.delegate_) {
+        throw Error('Template must be cleared before a new bindingDelegate ' +
+                    'can be assigned');
+      }
+
+      this.setDelegate_(this.newDelegate_(bindingDelegate));
+    },
+
+    get ref_() {
+      var ref = searchRefId(this, this.getAttribute('ref'));
+      if (!ref)
+        ref = this.instanceRef_;
+
+      if (!ref)
+        return this;
+
+      var nextRef = ref.ref_;
+      return nextRef ? nextRef : ref;
+    }
+  });
+
+  // Returns
+  //   a) undefined if there are no mustaches.
+  //   b) [TEXT, (ONE_TIME?, PATH, DELEGATE_FN, TEXT)+] if there is at least one mustache.
+  function parseMustaches(s, name, node, prepareBindingFn) {
+    if (!s || !s.length)
+      return;
+
+    var tokens;
+    var length = s.length;
+    var startIndex = 0, lastIndex = 0, endIndex = 0;
+    var onlyOneTime = true;
+    while (lastIndex < length) {
+      var startIndex = s.indexOf('{{', lastIndex);
+      var oneTimeStart = s.indexOf('[[', lastIndex);
+      var oneTime = false;
+      var terminator = '}}';
+
+      if (oneTimeStart >= 0 &&
+          (startIndex < 0 || oneTimeStart < startIndex)) {
+        startIndex = oneTimeStart;
+        oneTime = true;
+        terminator = ']]';
+      }
+
+      endIndex = startIndex < 0 ? -1 : s.indexOf(terminator, startIndex + 2);
+
+      if (endIndex < 0) {
+        if (!tokens)
+          return;
+
+        tokens.push(s.slice(lastIndex)); // TEXT
+        break;
+      }
+
+      tokens = tokens || [];
+      tokens.push(s.slice(lastIndex, startIndex)); // TEXT
+      var pathString = s.slice(startIndex + 2, endIndex).trim();
+      tokens.push(oneTime); // ONE_TIME?
+      onlyOneTime = onlyOneTime && oneTime;
+      var delegateFn = prepareBindingFn &&
+                       prepareBindingFn(pathString, name, node);
+      // Don't try to parse the expression if there's a prepareBinding function
+      if (delegateFn == null) {
+        tokens.push(Path.get(pathString)); // PATH
+      } else {
+        tokens.push(null);
+      }
+      tokens.push(delegateFn); // DELEGATE_FN
+      lastIndex = endIndex + 2;
+    }
+
+    if (lastIndex === length)
+      tokens.push(''); // TEXT
+
+    tokens.hasOnePath = tokens.length === 5;
+    tokens.isSimplePath = tokens.hasOnePath &&
+                          tokens[0] == '' &&
+                          tokens[4] == '';
+    tokens.onlyOneTime = onlyOneTime;
+
+    tokens.combinator = function(values) {
+      var newValue = tokens[0];
+
+      for (var i = 1; i < tokens.length; i += 4) {
+        var value = tokens.hasOnePath ? values : values[(i - 1) / 4];
+        if (value !== undefined)
+          newValue += value;
+        newValue += tokens[i + 3];
+      }
+
+      return newValue;
+    }
+
+    return tokens;
+  };
+
+  function processOneTimeBinding(name, tokens, node, model) {
+    if (tokens.hasOnePath) {
+      var delegateFn = tokens[3];
+      var value = delegateFn ? delegateFn(model, node, true) :
+                               tokens[2].getValueFrom(model);
+      return tokens.isSimplePath ? value : tokens.combinator(value);
+    }
+
+    var values = [];
+    for (var i = 1; i < tokens.length; i += 4) {
+      var delegateFn = tokens[i + 2];
+      values[(i - 1) / 4] = delegateFn ? delegateFn(model, node) :
+          tokens[i + 1].getValueFrom(model);
+    }
+
+    return tokens.combinator(values);
+  }
+
+  function processSinglePathBinding(name, tokens, node, model) {
+    var delegateFn = tokens[3];
+    var observer = delegateFn ? delegateFn(model, node, false) :
+        new PathObserver(model, tokens[2]);
+
+    return tokens.isSimplePath ? observer :
+        new ObserverTransform(observer, tokens.combinator);
+  }
+
+  function processBinding(name, tokens, node, model) {
+    if (tokens.onlyOneTime)
+      return processOneTimeBinding(name, tokens, node, model);
+
+    if (tokens.hasOnePath)
+      return processSinglePathBinding(name, tokens, node, model);
+
+    var observer = new CompoundObserver();
+
+    for (var i = 1; i < tokens.length; i += 4) {
+      var oneTime = tokens[i];
+      var delegateFn = tokens[i + 2];
+
+      if (delegateFn) {
+        var value = delegateFn(model, node, oneTime);
+        if (oneTime)
+          observer.addPath(value)
+        else
+          observer.addObserver(value);
+        continue;
+      }
+
+      var path = tokens[i + 1];
+      if (oneTime)
+        observer.addPath(path.getValueFrom(model))
+      else
+        observer.addPath(model, path);
+    }
+
+    return new ObserverTransform(observer, tokens.combinator);
+  }
+
+  function processBindings(node, bindings, model, instanceBindings) {
+    for (var i = 0; i < bindings.length; i += 2) {
+      var name = bindings[i]
+      var tokens = bindings[i + 1];
+      var value = processBinding(name, tokens, node, model);
+      var binding = node.bind(name, value, tokens.onlyOneTime);
+      if (binding && instanceBindings)
+        instanceBindings.push(binding);
+    }
+
+    node.bindFinished();
+    if (!bindings.isTemplate)
+      return;
+
+    node.model_ = model;
+    var iter = node.processBindingDirectives_(bindings);
+    if (instanceBindings && iter)
+      instanceBindings.push(iter);
+  }
+
+  function parseWithDefault(el, name, prepareBindingFn) {
+    var v = el.getAttribute(name);
+    return parseMustaches(v == '' ? '{{}}' : v, name, el, prepareBindingFn);
+  }
+
+  function parseAttributeBindings(element, prepareBindingFn) {
+    assert(element);
+
+    var bindings = [];
+    var ifFound = false;
+    var bindFound = false;
+
+    for (var i = 0; i < element.attributes.length; i++) {
+      var attr = element.attributes[i];
+      var name = attr.name;
+      var value = attr.value;
+
+      // Allow bindings expressed in attributes to be prefixed with underbars.
+      // We do this to allow correct semantics for browsers that don't implement
+      // <template> where certain attributes might trigger side-effects -- and
+      // for IE which sanitizes certain attributes, disallowing mustache
+      // replacements in their text.
+      while (name[0] === '_') {
+        name = name.substring(1);
+      }
+
+      if (isTemplate(element) &&
+          (name === IF || name === BIND || name === REPEAT)) {
+        continue;
+      }
+
+      var tokens = parseMustaches(value, name, element,
+                                  prepareBindingFn);
+      if (!tokens)
+        continue;
+
+      bindings.push(name, tokens);
+    }
+
+    if (isTemplate(element)) {
+      bindings.isTemplate = true;
+      bindings.if = parseWithDefault(element, IF, prepareBindingFn);
+      bindings.bind = parseWithDefault(element, BIND, prepareBindingFn);
+      bindings.repeat = parseWithDefault(element, REPEAT, prepareBindingFn);
+
+      if (bindings.if && !bindings.bind && !bindings.repeat)
+        bindings.bind = parseMustaches('{{}}', BIND, element, prepareBindingFn);
+    }
+
+    return bindings;
+  }
+
+  function getBindings(node, prepareBindingFn) {
+    if (node.nodeType === Node.ELEMENT_NODE)
+      return parseAttributeBindings(node, prepareBindingFn);
+
+    if (node.nodeType === Node.TEXT_NODE) {
+      var tokens = parseMustaches(node.data, 'textContent', node,
+                                  prepareBindingFn);
+      if (tokens)
+        return ['textContent', tokens];
+    }
+
+    return [];
+  }
+
+  function cloneAndBindInstance(node, parent, stagingDocument, bindings, model,
+                                delegate,
+                                instanceBindings,
+                                instanceRecord) {
+    var clone = parent.appendChild(stagingDocument.importNode(node, false));
+
+    var i = 0;
+    for (var child = node.firstChild; child; child = child.nextSibling) {
+      cloneAndBindInstance(child, clone, stagingDocument,
+                            bindings.children[i++],
+                            model,
+                            delegate,
+                            instanceBindings);
+    }
+
+    if (bindings.isTemplate) {
+      HTMLTemplateElement.decorate(clone, node);
+      if (delegate)
+        clone.setDelegate_(delegate);
+    }
+
+    processBindings(clone, bindings, model, instanceBindings);
+    return clone;
+  }
+
+  function createInstanceBindingMap(node, prepareBindingFn) {
+    var map = getBindings(node, prepareBindingFn);
+    map.children = {};
+    var index = 0;
+    for (var child = node.firstChild; child; child = child.nextSibling) {
+      map.children[index++] = createInstanceBindingMap(child, prepareBindingFn);
+    }
+
+    return map;
+  }
+
+  var contentUidCounter = 1;
+
+  // TODO(rafaelw): Setup a MutationObserver on content which clears the id
+  // so that bindingMaps regenerate when the template.content changes.
+  function getContentUid(content) {
+    var id = content.id_;
+    if (!id)
+      id = content.id_ = contentUidCounter++;
+    return id;
+  }
+
+  // Each delegate is associated with a set of bindingMaps, one for each
+  // content which may be used by a template. The intent is that each binding
+  // delegate gets the opportunity to prepare the instance (via the prepare*
+  // delegate calls) once across all uses.
+  // TODO(rafaelw): Separate out the parse map from the binding map. In the
+  // current implementation, if two delegates need a binding map for the same
+  // content, the second will have to reparse.
+  function getInstanceBindingMap(content, delegate_) {
+    var contentId = getContentUid(content);
+    if (delegate_) {
+      var map = delegate_.bindingMaps[contentId];
+      if (!map) {
+        map = delegate_.bindingMaps[contentId] =
+            createInstanceBindingMap(content, delegate_.prepareBinding) || [];
+      }
+      return map;
+    }
+
+    var map = content.bindingMap_;
+    if (!map) {
+      map = content.bindingMap_ =
+          createInstanceBindingMap(content, undefined) || [];
+    }
+    return map;
+  }
+
+  Object.defineProperty(Node.prototype, 'templateInstance', {
+    get: function() {
+      var instance = this.templateInstance_;
+      return instance ? instance :
+          (this.parentNode ? this.parentNode.templateInstance : undefined);
+    }
+  });
+
+  var emptyInstance = document.createDocumentFragment();
+  emptyInstance.bindings_ = [];
+  emptyInstance.terminator_ = null;
+
+  function TemplateIterator(templateElement) {
+    this.closed = false;
+    this.templateElement_ = templateElement;
+    this.instances = [];
+    this.deps = undefined;
+    this.iteratedValue = [];
+    this.presentValue = undefined;
+    this.arrayObserver = undefined;
+  }
+
+  TemplateIterator.prototype = {
+    closeDeps: function() {
+      var deps = this.deps;
+      if (deps) {
+        if (deps.ifOneTime === false)
+          deps.ifValue.close();
+        if (deps.oneTime === false)
+          deps.value.close();
+      }
+    },
+
+    updateDependencies: function(directives, model) {
+      this.closeDeps();
+
+      var deps = this.deps = {};
+      var template = this.templateElement_;
+
+      var ifValue = true;
+      if (directives.if) {
+        deps.hasIf = true;
+        deps.ifOneTime = directives.if.onlyOneTime;
+        deps.ifValue = processBinding(IF, directives.if, template, model);
+
+        ifValue = deps.ifValue;
+
+        // oneTime if & predicate is false. nothing else to do.
+        if (deps.ifOneTime && !ifValue) {
+          this.valueChanged();
+          return;
+        }
+
+        if (!deps.ifOneTime)
+          ifValue = ifValue.open(this.updateIfValue, this);
+      }
+
+      if (directives.repeat) {
+        deps.repeat = true;
+        deps.oneTime = directives.repeat.onlyOneTime;
+        deps.value = processBinding(REPEAT, directives.repeat, template, model);
+      } else {
+        deps.repeat = false;
+        deps.oneTime = directives.bind.onlyOneTime;
+        deps.value = processBinding(BIND, directives.bind, template, model);
+      }
+
+      var value = deps.value;
+      if (!deps.oneTime)
+        value = value.open(this.updateIteratedValue, this);
+
+      if (!ifValue) {
+        this.valueChanged();
+        return;
+      }
+
+      this.updateValue(value);
+    },
+
+    /**
+     * Gets the updated value of the bind/repeat. This can potentially call
+     * user code (if a bindingDelegate is set up) so we try to avoid it if we
+     * already have the value in hand (from Observer.open).
+     */
+    getUpdatedValue: function() {
+      var value = this.deps.value;
+      if (!this.deps.oneTime)
+        value = value.discardChanges();
+      return value;
+    },
+
+    updateIfValue: function(ifValue) {
+      if (!ifValue) {
+        this.valueChanged();
+        return;
+      }
+
+      this.updateValue(this.getUpdatedValue());
+    },
+
+    updateIteratedValue: function(value) {
+      if (this.deps.hasIf) {
+        var ifValue = this.deps.ifValue;
+        if (!this.deps.ifOneTime)
+          ifValue = ifValue.discardChanges();
+        if (!ifValue) {
+          this.valueChanged();
+          return;
+        }
+      }
+
+      this.updateValue(value);
+    },
+
+    updateValue: function(value) {
+      if (!this.deps.repeat)
+        value = [value];
+      var observe = this.deps.repeat &&
+                    !this.deps.oneTime &&
+                    Array.isArray(value);
+      this.valueChanged(value, observe);
+    },
+
+    valueChanged: function(value, observeValue) {
+      if (!Array.isArray(value))
+        value = [];
+
+      if (value === this.iteratedValue)
+        return;
+
+      this.unobserve();
+      this.presentValue = value;
+      if (observeValue) {
+        this.arrayObserver = new ArrayObserver(this.presentValue);
+        this.arrayObserver.open(this.handleSplices, this);
+      }
+
+      this.handleSplices(ArrayObserver.calculateSplices(this.presentValue,
+                                                        this.iteratedValue));
+    },
+
+    getLastInstanceNode: function(index) {
+      if (index == -1)
+        return this.templateElement_;
+      var instance = this.instances[index];
+      var terminator = instance.terminator_;
+      if (!terminator)
+        return this.getLastInstanceNode(index - 1);
+
+      if (terminator.nodeType !== Node.ELEMENT_NODE ||
+          this.templateElement_ === terminator) {
+        return terminator;
+      }
+
+      var subtemplateIterator = terminator.iterator_;
+      if (!subtemplateIterator)
+        return terminator;
+
+      return subtemplateIterator.getLastTemplateNode();
+    },
+
+    getLastTemplateNode: function() {
+      return this.getLastInstanceNode(this.instances.length - 1);
+    },
+
+    insertInstanceAt: function(index, fragment) {
+      var previousInstanceLast = this.getLastInstanceNode(index - 1);
+      var parent = this.templateElement_.parentNode;
+      this.instances.splice(index, 0, fragment);
+
+      parent.insertBefore(fragment, previousInstanceLast.nextSibling);
+    },
+
+    extractInstanceAt: function(index) {
+      var previousInstanceLast = this.getLastInstanceNode(index - 1);
+      var lastNode = this.getLastInstanceNode(index);
+      var parent = this.templateElement_.parentNode;
+      var instance = this.instances.splice(index, 1)[0];
+
+      while (lastNode !== previousInstanceLast) {
+        var node = previousInstanceLast.nextSibling;
+        if (node == lastNode)
+          lastNode = previousInstanceLast;
+
+        instance.appendChild(parent.removeChild(node));
+      }
+
+      return instance;
+    },
+
+    getDelegateFn: function(fn) {
+      fn = fn && fn(this.templateElement_);
+      return typeof fn === 'function' ? fn : null;
+    },
+
+    handleSplices: function(splices) {
+      if (this.closed || !splices.length)
+        return;
+
+      var template = this.templateElement_;
+
+      if (!template.parentNode) {
+        this.close();
+        return;
+      }
+
+      ArrayObserver.applySplices(this.iteratedValue, this.presentValue,
+                                 splices);
+
+      var delegate = template.delegate_;
+      if (this.instanceModelFn_ === undefined) {
+        this.instanceModelFn_ =
+            this.getDelegateFn(delegate && delegate.prepareInstanceModel);
+      }
+
+      if (this.instancePositionChangedFn_ === undefined) {
+        this.instancePositionChangedFn_ =
+            this.getDelegateFn(delegate &&
+                               delegate.prepareInstancePositionChanged);
+      }
+
+      // Instance Removals
+      var instanceCache = new Map;
+      var removeDelta = 0;
+      for (var i = 0; i < splices.length; i++) {
+        var splice = splices[i];
+        var removed = splice.removed;
+        for (var j = 0; j < removed.length; j++) {
+          var model = removed[j];
+          var instance = this.extractInstanceAt(splice.index + removeDelta);
+          if (instance !== emptyInstance) {
+            instanceCache.set(model, instance);
+          }
+        }
+
+        removeDelta -= splice.addedCount;
+      }
+
+      // Instance Insertions
+      for (var i = 0; i < splices.length; i++) {
+        var splice = splices[i];
+        var addIndex = splice.index;
+        for (; addIndex < splice.index + splice.addedCount; addIndex++) {
+          var model = this.iteratedValue[addIndex];
+          var instance = instanceCache.get(model);
+          if (instance) {
+            instanceCache.delete(model);
+          } else {
+            if (this.instanceModelFn_) {
+              model = this.instanceModelFn_(model);
+            }
+
+            if (model === undefined) {
+              instance = emptyInstance;
+            } else {
+              instance = template.createInstance(model, undefined, delegate);
+            }
+          }
+
+          this.insertInstanceAt(addIndex, instance);
+        }
+      }
+
+      instanceCache.forEach(function(instance) {
+        this.closeInstanceBindings(instance);
+      }, this);
+
+      if (this.instancePositionChangedFn_)
+        this.reportInstancesMoved(splices);
+    },
+
+    reportInstanceMoved: function(index) {
+      var instance = this.instances[index];
+      if (instance === emptyInstance)
+        return;
+
+      this.instancePositionChangedFn_(instance.templateInstance_, index);
+    },
+
+    reportInstancesMoved: function(splices) {
+      var index = 0;
+      var offset = 0;
+      for (var i = 0; i < splices.length; i++) {
+        var splice = splices[i];
+        if (offset != 0) {
+          while (index < splice.index) {
+            this.reportInstanceMoved(index);
+            index++;
+          }
+        } else {
+          index = splice.index;
+        }
+
+        while (index < splice.index + splice.addedCount) {
+          this.reportInstanceMoved(index);
+          index++;
+        }
+
+        offset += splice.addedCount - splice.removed.length;
+      }
+
+      if (offset == 0)
+        return;
+
+      var length = this.instances.length;
+      while (index < length) {
+        this.reportInstanceMoved(index);
+        index++;
+      }
+    },
+
+    closeInstanceBindings: function(instance) {
+      var bindings = instance.bindings_;
+      for (var i = 0; i < bindings.length; i++) {
+        bindings[i].close();
+      }
+    },
+
+    unobserve: function() {
+      if (!this.arrayObserver)
+        return;
+
+      this.arrayObserver.close();
+      this.arrayObserver = undefined;
+    },
+
+    close: function() {
+      if (this.closed)
+        return;
+      this.unobserve();
+      for (var i = 0; i < this.instances.length; i++) {
+        this.closeInstanceBindings(this.instances[i]);
+      }
+
+      this.instances.length = 0;
+      this.closeDeps();
+      this.templateElement_.iterator_ = undefined;
+      this.closed = true;
+    }
+  };
+
+  // Polyfill-specific API.
+  HTMLTemplateElement.forAllTemplatesFrom_ = forAllTemplatesFrom;
+})(this);
+
+(function(scope) {
+  'use strict';
+
+  // feature detect for URL constructor
+  var hasWorkingUrl = false;
+  if (!scope.forceJURL) {
+    try {
+      var u = new URL('b', 'http://a');
+      hasWorkingUrl = u.href === 'http://a/b';
+    } catch(e) {}
+  }
+
+  if (hasWorkingUrl)
+    return;
+
+  var relative = Object.create(null);
+  relative['ftp'] = 21;
+  relative['file'] = 0;
+  relative['gopher'] = 70;
+  relative['http'] = 80;
+  relative['https'] = 443;
+  relative['ws'] = 80;
+  relative['wss'] = 443;
+
+  var relativePathDotMapping = Object.create(null);
+  relativePathDotMapping['%2e'] = '.';
+  relativePathDotMapping['.%2e'] = '..';
+  relativePathDotMapping['%2e.'] = '..';
+  relativePathDotMapping['%2e%2e'] = '..';
+
+  function isRelativeScheme(scheme) {
+    return relative[scheme] !== undefined;
+  }
+
+  function invalid() {
+    clear.call(this);
+    this._isInvalid = true;
+  }
+
+  function IDNAToASCII(h) {
+    if ('' == h) {
+      invalid.call(this)
+    }
+    // XXX
+    return h.toLowerCase()
+  }
+
+  function percentEscape(c) {
+    var unicode = c.charCodeAt(0);
+    if (unicode > 0x20 &&
+       unicode < 0x7F &&
+       // " # < > ? `
+       [0x22, 0x23, 0x3C, 0x3E, 0x3F, 0x60].indexOf(unicode) == -1
+      ) {
+      return c;
+    }
+    return encodeURIComponent(c);
+  }
+
+  function percentEscapeQuery(c) {
+    // XXX This actually needs to encode c using encoding and then
+    // convert the bytes one-by-one.
+
+    var unicode = c.charCodeAt(0);
+    if (unicode > 0x20 &&
+       unicode < 0x7F &&
+       // " # < > ` (do not escape '?')
+       [0x22, 0x23, 0x3C, 0x3E, 0x60].indexOf(unicode) == -1
+      ) {
+      return c;
+    }
+    return encodeURIComponent(c);
+  }
+
+  var EOF = undefined,
+      ALPHA = /[a-zA-Z]/,
+      ALPHANUMERIC = /[a-zA-Z0-9\+\-\.]/;
+
+  function parse(input, stateOverride, base) {
+    function err(message) {
+      errors.push(message)
+    }
+
+    var state = stateOverride || 'scheme start',
+        cursor = 0,
+        buffer = '',
+        seenAt = false,
+        seenBracket = false,
+        errors = [];
+
+    loop: while ((input[cursor - 1] != EOF || cursor == 0) && !this._isInvalid) {
+      var c = input[cursor];
+      switch (state) {
+        case 'scheme start':
+          if (c && ALPHA.test(c)) {
+            buffer += c.toLowerCase(); // ASCII-safe
+            state = 'scheme';
+          } else if (!stateOverride) {
+            buffer = '';
+            state = 'no scheme';
+            continue;
+          } else {
+            err('Invalid scheme.');
+            break loop;
+          }
+          break;
+
+        case 'scheme':
+          if (c && ALPHANUMERIC.test(c)) {
+            buffer += c.toLowerCase(); // ASCII-safe
+          } else if (':' == c) {
+            this._scheme = buffer;
+            buffer = '';
+            if (stateOverride) {
+              break loop;
+            }
+            if (isRelativeScheme(this._scheme)) {
+              this._isRelative = true;
+            }
+            if ('file' == this._scheme) {
+              state = 'relative';
+            } else if (this._isRelative && base && base._scheme == this._scheme) {
+              state = 'relative or authority';
+            } else if (this._isRelative) {
+              state = 'authority first slash';
+            } else {
+              state = 'scheme data';
+            }
+          } else if (!stateOverride) {
+            buffer = '';
+            cursor = 0;
+            state = 'no scheme';
+            continue;
+          } else if (EOF == c) {
+            break loop;
+          } else {
+            err('Code point not allowed in scheme: ' + c)
+            break loop;
+          }
+          break;
+
+        case 'scheme data':
+          if ('?' == c) {
+            query = '?';
+            state = 'query';
+          } else if ('#' == c) {
+            this._fragment = '#';
+            state = 'fragment';
+          } else {
+            // XXX error handling
+            if (EOF != c && '\t' != c && '\n' != c && '\r' != c) {
+              this._schemeData += percentEscape(c);
+            }
+          }
+          break;
+
+        case 'no scheme':
+          if (!base || !(isRelativeScheme(base._scheme))) {
+            err('Missing scheme.');
+            invalid.call(this);
+          } else {
+            state = 'relative';
+            continue;
+          }
+          break;
+
+        case 'relative or authority':
+          if ('/' == c && '/' == input[cursor+1]) {
+            state = 'authority ignore slashes';
+          } else {
+            err('Expected /, got: ' + c);
+            state = 'relative';
+            continue
+          }
+          break;
+
+        case 'relative':
+          this._isRelative = true;
+          if ('file' != this._scheme)
+            this._scheme = base._scheme;
+          if (EOF == c) {
+            this._host = base._host;
+            this._port = base._port;
+            this._path = base._path.slice();
+            this._query = base._query;
+            break loop;
+          } else if ('/' == c || '\\' == c) {
+            if ('\\' == c)
+              err('\\ is an invalid code point.');
+            state = 'relative slash';
+          } else if ('?' == c) {
+            this._host = base._host;
+            this._port = base._port;
+            this._path = base._path.slice();
+            this._query = '?';
+            state = 'query';
+          } else if ('#' == c) {
+            this._host = base._host;
+            this._port = base._port;
+            this._path = base._path.slice();
+            this._query = base._query;
+            this._fragment = '#';
+            state = 'fragment';
+          } else {
+            var nextC = input[cursor+1]
+            var nextNextC = input[cursor+2]
+            if (
+              'file' != this._scheme || !ALPHA.test(c) ||
+              (nextC != ':' && nextC != '|') ||
+              (EOF != nextNextC && '/' != nextNextC && '\\' != nextNextC && '?' != nextNextC && '#' != nextNextC)) {
+              this._host = base._host;
+              this._port = base._port;
+              this._path = base._path.slice();
+              this._path.pop();
+            }
+            state = 'relative path';
+            continue;
+          }
+          break;
+
+        case 'relative slash':
+          if ('/' == c || '\\' == c) {
+            if ('\\' == c) {
+              err('\\ is an invalid code point.');
+            }
+            if ('file' == this._scheme) {
+              state = 'file host';
+            } else {
+              state = 'authority ignore slashes';
+            }
+          } else {
+            if ('file' != this._scheme) {
+              this._host = base._host;
+              this._port = base._port;
+            }
+            state = 'relative path';
+            continue;
+          }
+          break;
+
+        case 'authority first slash':
+          if ('/' == c) {
+            state = 'authority second slash';
+          } else {
+            err("Expected '/', got: " + c);
+            state = 'authority ignore slashes';
+            continue;
+          }
+          break;
+
+        case 'authority second slash':
+          state = 'authority ignore slashes';
+          if ('/' != c) {
+            err("Expected '/', got: " + c);
+            continue;
+          }
+          break;
+
+        case 'authority ignore slashes':
+          if ('/' != c && '\\' != c) {
+            state = 'authority';
+            continue;
+          } else {
+            err('Expected authority, got: ' + c);
+          }
+          break;
+
+        case 'authority':
+          if ('@' == c) {
+            if (seenAt) {
+              err('@ already seen.');
+              buffer += '%40';
+            }
+            seenAt = true;
+            for (var i = 0; i < buffer.length; i++) {
+              var cp = buffer[i];
+              if ('\t' == cp || '\n' == cp || '\r' == cp) {
+                err('Invalid whitespace in authority.');
+                continue;
+              }
+              // XXX check URL code points
+              if (':' == cp && null === this._password) {
+                this._password = '';
+                continue;
+              }
+              var tempC = percentEscape(cp);
+              (null !== this._password) ? this._password += tempC : this._username += tempC;
+            }
+            buffer = '';
+          } else if (EOF == c || '/' == c || '\\' == c || '?' == c || '#' == c) {
+            cursor -= buffer.length;
+            buffer = '';
+            state = 'host';
+            continue;
+          } else {
+            buffer += c;
+          }
+          break;
+
+        case 'file host':
+          if (EOF == c || '/' == c || '\\' == c || '?' == c || '#' == c) {
+            if (buffer.length == 2 && ALPHA.test(buffer[0]) && (buffer[1] == ':' || buffer[1] == '|')) {
+              state = 'relative path';
+            } else if (buffer.length == 0) {
+              state = 'relative path start';
+            } else {
+              this._host = IDNAToASCII.call(this, buffer);
+              buffer = '';
+              state = 'relative path start';
+            }
+            continue;
+          } else if ('\t' == c || '\n' == c || '\r' == c) {
+            err('Invalid whitespace in file host.');
+          } else {
+            buffer += c;
+          }
+          break;
+
+        case 'host':
+        case 'hostname':
+          if (':' == c && !seenBracket) {
+            // XXX host parsing
+            this._host = IDNAToASCII.call(this, buffer);
+            buffer = '';
+            state = 'port';
+            if ('hostname' == stateOverride) {
+              break loop;
+            }
+          } else if (EOF == c || '/' == c || '\\' == c || '?' == c || '#' == c) {
+            this._host = IDNAToASCII.call(this, buffer);
+            buffer = '';
+            state = 'relative path start';
+            if (stateOverride) {
+              break loop;
+            }
+            continue;
+          } else if ('\t' != c && '\n' != c && '\r' != c) {
+            if ('[' == c) {
+              seenBracket = true;
+            } else if (']' == c) {
+              seenBracket = false;
+            }
+            buffer += c;
+          } else {
+            err('Invalid code point in host/hostname: ' + c);
+          }
+          break;
+
+        case 'port':
+          if (/[0-9]/.test(c)) {
+            buffer += c;
+          } else if (EOF == c || '/' == c || '\\' == c || '?' == c || '#' == c || stateOverride) {
+            if ('' != buffer) {
+              var temp = parseInt(buffer, 10);
+              if (temp != relative[this._scheme]) {
+                this._port = temp + '';
+              }
+              buffer = '';
+            }
+            if (stateOverride) {
+              break loop;
+            }
+            state = 'relative path start';
+            continue;
+          } else if ('\t' == c || '\n' == c || '\r' == c) {
+            err('Invalid code point in port: ' + c);
+          } else {
+            invalid.call(this);
+          }
+          break;
+
+        case 'relative path start':
+          if ('\\' == c)
+            err("'\\' not allowed in path.");
+          state = 'relative path';
+          if ('/' != c && '\\' != c) {
+            continue;
+          }
+          break;
+
+        case 'relative path':
+          if (EOF == c || '/' == c || '\\' == c || (!stateOverride && ('?' == c || '#' == c))) {
+            if ('\\' == c) {
+              err('\\ not allowed in relative path.');
+            }
+            var tmp;
+            if (tmp = relativePathDotMapping[buffer.toLowerCase()]) {
+              buffer = tmp;
+            }
+            if ('..' == buffer) {
+              this._path.pop();
+              if ('/' != c && '\\' != c) {
+                this._path.push('');
+              }
+            } else if ('.' == buffer && '/' != c && '\\' != c) {
+              this._path.push('');
+            } else if ('.' != buffer) {
+              if ('file' == this._scheme && this._path.length == 0 && buffer.length == 2 && ALPHA.test(buffer[0]) && buffer[1] == '|') {
+                buffer = buffer[0] + ':';
+              }
+              this._path.push(buffer);
+            }
+            buffer = '';
+            if ('?' == c) {
+              this._query = '?';
+              state = 'query';
+            } else if ('#' == c) {
+              this._fragment = '#';
+              state = 'fragment';
+            }
+          } else if ('\t' != c && '\n' != c && '\r' != c) {
+            buffer += percentEscape(c);
+          }
+          break;
+
+        case 'query':
+          if (!stateOverride && '#' == c) {
+            this._fragment = '#';
+            state = 'fragment';
+          } else if (EOF != c && '\t' != c && '\n' != c && '\r' != c) {
+            this._query += percentEscapeQuery(c);
+          }
+          break;
+
+        case 'fragment':
+          if (EOF != c && '\t' != c && '\n' != c && '\r' != c) {
+            this._fragment += c;
+          }
+          break;
+      }
+
+      cursor++;
+    }
+  }
+
+  function clear() {
+    this._scheme = '';
+    this._schemeData = '';
+    this._username = '';
+    this._password = null;
+    this._host = '';
+    this._port = '';
+    this._path = [];
+    this._query = '';
+    this._fragment = '';
+    this._isInvalid = false;
+    this._isRelative = false;
+  }
+
+  // Does not process domain names or IP addresses.
+  // Does not handle encoding for the query parameter.
+  function jURL(url, base /* , encoding */) {
+    if (base !== undefined && !(base instanceof jURL))
+      base = new jURL(String(base));
+
+    this._url = url;
+    clear.call(this);
+
+    var input = url.replace(/^[ \t\r\n\f]+|[ \t\r\n\f]+$/g, '');
+    // encoding = encoding || 'utf-8'
+
+    parse.call(this, input, null, base);
+  }
+
+  jURL.prototype = {
+    get href() {
+      if (this._isInvalid)
+        return this._url;
+
+      var authority = '';
+      if ('' != this._username || null != this._password) {
+        authority = this._username +
+            (null != this._password ? ':' + this._password : '') + '@';
+      }
+
+      return this.protocol +
+          (this._isRelative ? '//' + authority + this.host : '') +
+          this.pathname + this._query + this._fragment;
+    },
+    set href(href) {
+      clear.call(this);
+      parse.call(this, href);
+    },
+
+    get protocol() {
+      return this._scheme + ':';
+    },
+    set protocol(protocol) {
+      if (this._isInvalid)
+        return;
+      parse.call(this, protocol + ':', 'scheme start');
+    },
+
+    get host() {
+      return this._isInvalid ? '' : this._port ?
+          this._host + ':' + this._port : this._host;
+    },
+    set host(host) {
+      if (this._isInvalid || !this._isRelative)
+        return;
+      parse.call(this, host, 'host');
+    },
+
+    get hostname() {
+      return this._host;
+    },
+    set hostname(hostname) {
+      if (this._isInvalid || !this._isRelative)
+        return;
+      parse.call(this, hostname, 'hostname');
+    },
+
+    get port() {
+      return this._port;
+    },
+    set port(port) {
+      if (this._isInvalid || !this._isRelative)
+        return;
+      parse.call(this, port, 'port');
+    },
+
+    get pathname() {
+      return this._isInvalid ? '' : this._isRelative ?
+          '/' + this._path.join('/') : this._schemeData;
+    },
+    set pathname(pathname) {
+      if (this._isInvalid || !this._isRelative)
+        return;
+      this._path = [];
+      parse.call(this, pathname, 'relative path start');
+    },
+
+    get search() {
+      return this._isInvalid || !this._query || '?' == this._query ?
+          '' : this._query;
+    },
+    set search(search) {
+      if (this._isInvalid || !this._isRelative)
+        return;
+      this._query = '?';
+      if ('?' == search[0])
+        search = search.slice(1);
+      parse.call(this, search, 'query');
+    },
+
+    get hash() {
+      return this._isInvalid || !this._fragment || '#' == this._fragment ?
+          '' : this._fragment;
+    },
+    set hash(hash) {
+      if (this._isInvalid)
+        return;
+      this._fragment = '#';
+      if ('#' == hash[0])
+        hash = hash.slice(1);
+      parse.call(this, hash, 'fragment');
+    },
+
+    get origin() {
+      var host;
+      if (this._isInvalid || !this._scheme) {
+        return '';
+      }
+      // javascript: Gecko returns String(""), WebKit/Blink String("null")
+      // Gecko throws error for "data://"
+      // data: Gecko returns "", Blink returns "data://", WebKit returns "null"
+      // Gecko returns String("") for file: mailto:
+      // WebKit/Blink returns String("SCHEME://") for file: mailto:
+      switch (this._scheme) {
+        case 'data':
+        case 'file':
+        case 'javascript':
+        case 'mailto':
+          return 'null';
+      }
+      host = this.host;
+      if (!host) {
+        return '';
+      }
+      return this._scheme + '://' + host;
+    }
+  };
+
+  // Copy over the static methods
+  var OriginalURL = scope.URL;
+  if (OriginalURL) {
+    jURL.createObjectURL = function(blob) {
+      // IE extension allows a second optional options argument.
+      // http://msdn.microsoft.com/en-us/library/ie/hh772302(v=vs.85).aspx
+      return OriginalURL.createObjectURL.apply(OriginalURL, arguments);
+    };
+    jURL.revokeObjectURL = function(url) {
+      OriginalURL.revokeObjectURL(url);
+    };
+  }
+
+  scope.URL = jURL;
+
+})(this);
+
+(function(scope) {
+
+var iterations = 0;
+var callbacks = [];
+var twiddle = document.createTextNode('');
+
+function endOfMicrotask(callback) {
+  twiddle.textContent = iterations++;
+  callbacks.push(callback);
+}
+
+function atEndOfMicrotask() {
+  while (callbacks.length) {
+    callbacks.shift()();
+  }
+}
+
+new (window.MutationObserver || JsMutationObserver)(atEndOfMicrotask)
+  .observe(twiddle, {characterData: true})
+  ;
+
+// exports
+scope.endOfMicrotask = endOfMicrotask;
+// bc 
+Platform.endOfMicrotask = endOfMicrotask;
+
+})(Polymer);
+
+
+(function(scope) {
+
+/**
+ * @class Polymer
+ */
+
+// imports
+var endOfMicrotask = scope.endOfMicrotask;
+
+// logging
+var log = window.WebComponents ? WebComponents.flags.log : {};
+
+// inject style sheet
+var style = document.createElement('style');
+style.textContent = 'template {display: none !important;} /* injected by platform.js */';
+var head = document.querySelector('head');
+head.insertBefore(style, head.firstChild);
+
+
+/**
+ * Force any pending data changes to be observed before 
+ * the next task. Data changes are processed asynchronously but are guaranteed
+ * to be processed, for example, before paintin. This method should rarely be 
+ * needed. It does nothing when Object.observe is available; 
+ * when Object.observe is not available, Polymer automatically flushes data 
+ * changes approximately every 1/10 second. 
+ * Therefore, `flush` should only be used when a data mutation should be 
+ * observed sooner than this.
+ * 
+ * @method flush
+ */
+// flush (with logging)
+var flushing;
+function flush() {
+  if (!flushing) {
+    flushing = true;
+    endOfMicrotask(function() {
+      flushing = false;
+      log.data && console.group('flush');
+      Platform.performMicrotaskCheckpoint();
+      log.data && console.groupEnd();
+    });
+  }
+};
+
+// polling dirty checker
+// flush periodically if platform does not have object observe.
+if (!Observer.hasObjectObserve) {
+  var FLUSH_POLL_INTERVAL = 125;
+  window.addEventListener('WebComponentsReady', function() {
+    flush();
+    // watch document visiblity to toggle dirty-checking
+    var visibilityHandler = function() {
+      // only flush if the page is visibile
+      if (document.visibilityState === 'hidden') {
+        if (scope.flushPoll) {
+          clearInterval(scope.flushPoll);
+        }
+      } else {
+        scope.flushPoll = setInterval(flush, FLUSH_POLL_INTERVAL);
+      }
+    };
+    if (typeof document.visibilityState === 'string') {
+      document.addEventListener('visibilitychange', visibilityHandler);
+    }
+    visibilityHandler();
+  });
+} else {
+  // make flush a no-op when we have Object.observe
+  flush = function() {};
+}
+
+if (window.CustomElements && !CustomElements.useNative) {
+  var originalImportNode = Document.prototype.importNode;
+  Document.prototype.importNode = function(node, deep) {
+    var imported = originalImportNode.call(this, node, deep);
+    CustomElements.upgradeAll(imported);
+    return imported;
+  };
+}
+
+// exports
+scope.flush = flush;
+// bc
+Platform.flush = flush;
+
+})(window.Polymer);
+
+
+(function(scope) {
+
+var urlResolver = {
+  resolveDom: function(root, url) {
+    url = url || baseUrl(root);
+    this.resolveAttributes(root, url);
+    this.resolveStyles(root, url);
+    // handle template.content
+    var templates = root.querySelectorAll('template');
+    if (templates) {
+      for (var i = 0, l = templates.length, t; (i < l) && (t = templates[i]); i++) {
+        if (t.content) {
+          this.resolveDom(t.content, url);
+        }
+      }
+    }
+  },
+  resolveTemplate: function(template) {
+    this.resolveDom(template.content, baseUrl(template));
+  },
+  resolveStyles: function(root, url) {
+    var styles = root.querySelectorAll('style');
+    if (styles) {
+      for (var i = 0, l = styles.length, s; (i < l) && (s = styles[i]); i++) {
+        this.resolveStyle(s, url);
+      }
+    }
+  },
+  resolveStyle: function(style, url) {
+    url = url || baseUrl(style);
+    style.textContent = this.resolveCssText(style.textContent, url);
+  },
+  resolveCssText: function(cssText, baseUrl, keepAbsolute) {
+    cssText = replaceUrlsInCssText(cssText, baseUrl, keepAbsolute, CSS_URL_REGEXP);
+    return replaceUrlsInCssText(cssText, baseUrl, keepAbsolute, CSS_IMPORT_REGEXP);
+  },
+  resolveAttributes: function(root, url) {
+    if (root.hasAttributes && root.hasAttributes()) {
+      this.resolveElementAttributes(root, url);
+    }
+    // search for attributes that host urls
+    var nodes = root && root.querySelectorAll(URL_ATTRS_SELECTOR);
+    if (nodes) {
+      for (var i = 0, l = nodes.length, n; (i < l) && (n = nodes[i]); i++) {
+        this.resolveElementAttributes(n, url);
+      }
+    }
+  },
+  resolveElementAttributes: function(node, url) {
+    url = url || baseUrl(node);
+    URL_ATTRS.forEach(function(v) {
+      var attr = node.attributes[v];
+      var value = attr && attr.value;
+      var replacement;
+      if (value && value.search(URL_TEMPLATE_SEARCH) < 0) {
+        if (v === 'style') {
+          replacement = replaceUrlsInCssText(value, url, false, CSS_URL_REGEXP);
+        } else {
+          replacement = resolveRelativeUrl(url, value);
+        }
+        attr.value = replacement;
+      }
+    });
+  }
+};
+
+var CSS_URL_REGEXP = /(url\()([^)]*)(\))/g;
+var CSS_IMPORT_REGEXP = /(@import[\s]+(?!url\())([^;]*)(;)/g;
+var URL_ATTRS = ['href', 'src', 'action', 'style', 'url'];
+var URL_ATTRS_SELECTOR = '[' + URL_ATTRS.join('],[') + ']';
+var URL_TEMPLATE_SEARCH = '{{.*}}';
+var URL_HASH = '#';
+
+function baseUrl(node) {
+  var u = new URL(node.ownerDocument.baseURI);
+  u.search = '';
+  u.hash = '';
+  return u;
+}
+
+function replaceUrlsInCssText(cssText, baseUrl, keepAbsolute, regexp) {
+  return cssText.replace(regexp, function(m, pre, url, post) {
+    var urlPath = url.replace(/["']/g, '');
+    urlPath = resolveRelativeUrl(baseUrl, urlPath, keepAbsolute);
+    return pre + '\'' + urlPath + '\'' + post;
+  });
+}
+
+function resolveRelativeUrl(baseUrl, url, keepAbsolute) {
+  // do not resolve '/' absolute urls
+  if (url && url[0] === '/') {
+    return url;
+  }
+  var u = new URL(url, baseUrl);
+  return keepAbsolute ? u.href : makeDocumentRelPath(u.href);
+}
+
+function makeDocumentRelPath(url) {
+  var root = baseUrl(document.documentElement);
+  var u = new URL(url, root);
+  if (u.host === root.host && u.port === root.port &&
+      u.protocol === root.protocol) {
+    return makeRelPath(root, u);
+  } else {
+    return url;
+  }
+}
+
+// make a relative path from source to target
+function makeRelPath(sourceUrl, targetUrl) {
+  var source = sourceUrl.pathname;
+  var target = targetUrl.pathname;
+  var s = source.split('/');
+  var t = target.split('/');
+  while (s.length && s[0] === t[0]){
+    s.shift();
+    t.shift();
+  }
+  for (var i = 0, l = s.length - 1; i < l; i++) {
+    t.unshift('..');
+  }
+  // empty '#' is discarded but we need to preserve it.
+  var hash = (targetUrl.href.slice(-1) === URL_HASH) ? URL_HASH : targetUrl.hash;
+  return t.join('/') + targetUrl.search + hash;
+}
+
+// exports
+scope.urlResolver = urlResolver;
+
+})(Polymer);
+
+(function(scope) {
+  var endOfMicrotask = Polymer.endOfMicrotask;
+
+  // Generic url loader
+  function Loader(regex) {
+    this.cache = Object.create(null);
+    this.map = Object.create(null);
+    this.requests = 0;
+    this.regex = regex;
+  }
+  Loader.prototype = {
+
+    // TODO(dfreedm): there may be a better factoring here
+    // extract absolute urls from the text (full of relative urls)
+    extractUrls: function(text, base) {
+      var matches = [];
+      var matched, u;
+      while ((matched = this.regex.exec(text))) {
+        u = new URL(matched[1], base);
+        matches.push({matched: matched[0], url: u.href});
+      }
+      return matches;
+    },
+    // take a text blob, a root url, and a callback and load all the urls found within the text
+    // returns a map of absolute url to text
+    process: function(text, root, callback) {
+      var matches = this.extractUrls(text, root);
+
+      // every call to process returns all the text this loader has ever received
+      var done = callback.bind(null, this.map);
+      this.fetch(matches, done);
+    },
+    // build a mapping of url -> text from matches
+    fetch: function(matches, callback) {
+      var inflight = matches.length;
+
+      // return early if there is no fetching to be done
+      if (!inflight) {
+        return callback();
+      }
+
+      // wait for all subrequests to return
+      var done = function() {
+        if (--inflight === 0) {
+          callback();
+        }
+      };
+
+      // start fetching all subrequests
+      var m, req, url;
+      for (var i = 0; i < inflight; i++) {
+        m = matches[i];
+        url = m.url;
+        req = this.cache[url];
+        // if this url has already been requested, skip requesting it again
+        if (!req) {
+          req = this.xhr(url);
+          req.match = m;
+          this.cache[url] = req;
+        }
+        // wait for the request to process its subrequests
+        req.wait(done);
+      }
+    },
+    handleXhr: function(request) {
+      var match = request.match;
+      var url = match.url;
+
+      // handle errors with an empty string
+      var response = request.response || request.responseText || '';
+      this.map[url] = response;
+      this.fetch(this.extractUrls(response, url), request.resolve);
+    },
+    xhr: function(url) {
+      this.requests++;
+      var request = new XMLHttpRequest();
+      request.open('GET', url, true);
+      request.send();
+      request.onerror = request.onload = this.handleXhr.bind(this, request);
+
+      // queue of tasks to run after XHR returns
+      request.pending = [];
+      request.resolve = function() {
+        var pending = request.pending;
+        for(var i = 0; i < pending.length; i++) {
+          pending[i]();
+        }
+        request.pending = null;
+      };
+
+      // if we have already resolved, pending is null, async call the callback
+      request.wait = function(fn) {
+        if (request.pending) {
+          request.pending.push(fn);
+        } else {
+          endOfMicrotask(fn);
+        }
+      };
+
+      return request;
+    }
+  };
+
+  scope.Loader = Loader;
+})(Polymer);
+
+(function(scope) {
+
+var urlResolver = scope.urlResolver;
+var Loader = scope.Loader;
+
+function StyleResolver() {
+  this.loader = new Loader(this.regex);
+}
+StyleResolver.prototype = {
+  regex: /@import\s+(?:url)?["'\(]*([^'"\)]*)['"\)]*;/g,
+  // Recursively replace @imports with the text at that url
+  resolve: function(text, url, callback) {
+    var done = function(map) {
+      callback(this.flatten(text, url, map));
+    }.bind(this);
+    this.loader.process(text, url, done);
+  },
+  // resolve the textContent of a style node
+  resolveNode: function(style, url, callback) {
+    var text = style.textContent;
+    var done = function(text) {
+      style.textContent = text;
+      callback(style);
+    };
+    this.resolve(text, url, done);
+  },
+  // flatten all the @imports to text
+  flatten: function(text, base, map) {
+    var matches = this.loader.extractUrls(text, base);
+    var match, url, intermediate;
+    for (var i = 0; i < matches.length; i++) {
+      match = matches[i];
+      url = match.url;
+      // resolve any css text to be relative to the importer, keep absolute url
+      intermediate = urlResolver.resolveCssText(map[url], url, true);
+      // flatten intermediate @imports
+      intermediate = this.flatten(intermediate, base, map);
+      text = text.replace(match.matched, intermediate);
+    }
+    return text;
+  },
+  loadStyles: function(styles, base, callback) {
+    var loaded=0, l = styles.length;
+    // called in the context of the style
+    function loadedStyle(style) {
+      loaded++;
+      if (loaded === l && callback) {
+        callback();
+      }
+    }
+    for (var i=0, s; (i<l) && (s=styles[i]); i++) {
+      this.resolveNode(s, base, loadedStyle);
+    }
+  }
+};
+
+var styleResolver = new StyleResolver();
+
+// exports
+scope.styleResolver = styleResolver;
+
+})(Polymer);
+
+(function(scope) {
+
+  // copy own properties from 'api' to 'prototype, with name hinting for 'super'
+  function extend(prototype, api) {
+    if (prototype && api) {
+      // use only own properties of 'api'
+      Object.getOwnPropertyNames(api).forEach(function(n) {
+        // acquire property descriptor
+        var pd = Object.getOwnPropertyDescriptor(api, n);
+        if (pd) {
+          // clone property via descriptor
+          Object.defineProperty(prototype, n, pd);
+          // cache name-of-method for 'super' engine
+          if (typeof pd.value == 'function') {
+            // hint the 'super' engine
+            pd.value.nom = n;
+          }
+        }
+      });
+    }
+    return prototype;
+  }
+
+
+  // mixin
+
+  // copy all properties from inProps (et al) to inObj
+  function mixin(inObj/*, inProps, inMoreProps, ...*/) {
+    var obj = inObj || {};
+    for (var i = 1; i < arguments.length; i++) {
+      var p = arguments[i];
+      try {
+        for (var n in p) {
+          copyProperty(n, p, obj);
+        }
+      } catch(x) {
+      }
+    }
+    return obj;
+  }
+
+  // copy property inName from inSource object to inTarget object
+  function copyProperty(inName, inSource, inTarget) {
+    var pd = getPropertyDescriptor(inSource, inName);
+    Object.defineProperty(inTarget, inName, pd);
+  }
+
+  // get property descriptor for inName on inObject, even if
+  // inName exists on some link in inObject's prototype chain
+  function getPropertyDescriptor(inObject, inName) {
+    if (inObject) {
+      var pd = Object.getOwnPropertyDescriptor(inObject, inName);
+      return pd || getPropertyDescriptor(Object.getPrototypeOf(inObject), inName);
+    }
+  }
+
+  // exports
+
+  scope.extend = extend;
+  scope.mixin = mixin;
+
+  // for bc
+  Platform.mixin = mixin;
+
+})(Polymer);
+
+(function(scope) {
+  
+  // usage
+  
+  // invoke cb.call(this) in 100ms, unless the job is re-registered,
+  // which resets the timer
+  // 
+  // this.myJob = this.job(this.myJob, cb, 100)
+  //
+  // returns a job handle which can be used to re-register a job
+
+  var Job = function(inContext) {
+    this.context = inContext;
+    this.boundComplete = this.complete.bind(this)
+  };
+  Job.prototype = {
+    go: function(callback, wait) {
+      this.callback = callback;
+      var h;
+      if (!wait) {
+        h = requestAnimationFrame(this.boundComplete);
+        this.handle = function() {
+          cancelAnimationFrame(h);
+        }
+      } else {
+        h = setTimeout(this.boundComplete, wait);
+        this.handle = function() {
+          clearTimeout(h);
+        }
+      }
+    },
+    stop: function() {
+      if (this.handle) {
+        this.handle();
+        this.handle = null;
+      }
+    },
+    complete: function() {
+      if (this.handle) {
+        this.stop();
+        this.callback.call(this.context);
+      }
+    }
+  };
+  
+  function job(job, callback, wait) {
+    if (job) {
+      job.stop();
+    } else {
+      job = new Job(this);
+    }
+    job.go(callback, wait);
+    return job;
+  }
+  
+  // exports 
+
+  scope.job = job;
+  
+})(Polymer);
+
+(function(scope) {
+
+  // dom polyfill, additions, and utility methods
+
+  var registry = {};
+
+  HTMLElement.register = function(tag, prototype) {
+    registry[tag] = prototype;
+  };
+
+  // get prototype mapped to node <tag>
+  HTMLElement.getPrototypeForTag = function(tag) {
+    var prototype = !tag ? HTMLElement.prototype : registry[tag];
+    // TODO(sjmiles): creating <tag> is likely to have wasteful side-effects
+    return prototype || Object.getPrototypeOf(document.createElement(tag));
+  };
+
+  // we have to flag propagation stoppage for the event dispatcher
+  var originalStopPropagation = Event.prototype.stopPropagation;
+  Event.prototype.stopPropagation = function() {
+    this.cancelBubble = true;
+    originalStopPropagation.apply(this, arguments);
+  };
+  
+  
+  // polyfill DOMTokenList
+  // * add/remove: allow these methods to take multiple classNames
+  // * toggle: add a 2nd argument which forces the given state rather
+  //  than toggling.
+
+  var add = DOMTokenList.prototype.add;
+  var remove = DOMTokenList.prototype.remove;
+  DOMTokenList.prototype.add = function() {
+    for (var i = 0; i < arguments.length; i++) {
+      add.call(this, arguments[i]);
+    }
+  };
+  DOMTokenList.prototype.remove = function() {
+    for (var i = 0; i < arguments.length; i++) {
+      remove.call(this, arguments[i]);
+    }
+  };
+  DOMTokenList.prototype.toggle = function(name, bool) {
+    if (arguments.length == 1) {
+      bool = !this.contains(name);
+    }
+    bool ? this.add(name) : this.remove(name);
+  };
+  DOMTokenList.prototype.switch = function(oldName, newName) {
+    oldName && this.remove(oldName);
+    newName && this.add(newName);
+  };
+
+  // add array() to NodeList, NamedNodeMap, HTMLCollection
+
+  var ArraySlice = function() {
+    return Array.prototype.slice.call(this);
+  };
+
+  var namedNodeMap = (window.NamedNodeMap || window.MozNamedAttrMap || {});
+
+  NodeList.prototype.array = ArraySlice;
+  namedNodeMap.prototype.array = ArraySlice;
+  HTMLCollection.prototype.array = ArraySlice;
+
+  // utility
+
+  function createDOM(inTagOrNode, inHTML, inAttrs) {
+    var dom = typeof inTagOrNode == 'string' ?
+        document.createElement(inTagOrNode) : inTagOrNode.cloneNode(true);
+    dom.innerHTML = inHTML;
+    if (inAttrs) {
+      for (var n in inAttrs) {
+        dom.setAttribute(n, inAttrs[n]);
+      }
+    }
+    return dom;
+  }
+
+  // exports
+
+  scope.createDOM = createDOM;
+
+})(Polymer);
+
+(function(scope) {
+    // super
+
+    // `arrayOfArgs` is an optional array of args like one might pass
+    // to `Function.apply`
+
+    // TODO(sjmiles):
+    //    $super must be installed on an instance or prototype chain
+    //    as `super`, and invoked via `this`, e.g.
+    //      `this.super();`
+
+    //    will not work if function objects are not unique, for example,
+    //    when using mixins.
+    //    The memoization strategy assumes each function exists on only one 
+    //    prototype chain i.e. we use the function object for memoizing)
+    //    perhaps we can bookkeep on the prototype itself instead
+    function $super(arrayOfArgs) {
+      // since we are thunking a method call, performance is important here: 
+      // memoize all lookups, once memoized the fast path calls no other 
+      // functions
+      //
+      // find the caller (cannot be `strict` because of 'caller')
+      var caller = $super.caller;
+      // memoized 'name of method' 
+      var nom = caller.nom;
+      // memoized next implementation prototype
+      var _super = caller._super;
+      if (!_super) {
+        if (!nom) {
+          nom = caller.nom = nameInThis.call(this, caller);
+        }
+        if (!nom) {
+          console.warn('called super() on a method not installed declaratively (has no .nom property)');
+        }
+        // super prototype is either cached or we have to find it
+        // by searching __proto__ (at the 'top')
+        // invariant: because we cache _super on fn below, we never reach 
+        // here from inside a series of calls to super(), so it's ok to 
+        // start searching from the prototype of 'this' (at the 'top')
+        // we must never memoize a null super for this reason
+        _super = memoizeSuper(caller, nom, getPrototypeOf(this));
+      }
+      // our super function
+      var fn = _super[nom];
+      if (fn) {
+        // memoize information so 'fn' can call 'super'
+        if (!fn._super) {
+          // must not memoize null, or we lose our invariant above
+          memoizeSuper(fn, nom, _super);
+        }
+        // invoke the inherited method
+        // if 'fn' is not function valued, this will throw
+        return fn.apply(this, arrayOfArgs || []);
+      }
+    }
+
+    function nameInThis(value) {
+      var p = this.__proto__;
+      while (p && p !== HTMLElement.prototype) {
+        // TODO(sjmiles): getOwnPropertyNames is absurdly expensive
+        var n$ = Object.getOwnPropertyNames(p);
+        for (var i=0, l=n$.length, n; i<l && (n=n$[i]); i++) {
+          var d = Object.getOwnPropertyDescriptor(p, n);
+          if (typeof d.value === 'function' && d.value === value) {
+            return n;
+          }
+        }
+        p = p.__proto__;
+      }
+    }
+
+    function memoizeSuper(method, name, proto) {
+      // find and cache next prototype containing `name`
+      // we need the prototype so we can do another lookup
+      // from here
+      var s = nextSuper(proto, name, method);
+      if (s[name]) {
+        // `s` is a prototype, the actual method is `s[name]`
+        // tag super method with it's name for quicker lookups
+        s[name].nom = name;
+      }
+      return method._super = s;
+    }
+
+    function nextSuper(proto, name, caller) {
+      // look for an inherited prototype that implements name
+      while (proto) {
+        if ((proto[name] !== caller) && proto[name]) {
+          return proto;
+        }
+        proto = getPrototypeOf(proto);
+      }
+      // must not return null, or we lose our invariant above
+      // in this case, a super() call was invoked where no superclass
+      // method exists
+      // TODO(sjmiles): thow an exception?
+      return Object;
+    }
+
+    // NOTE: In some platforms (IE10) the prototype chain is faked via 
+    // __proto__. Therefore, always get prototype via __proto__ instead of
+    // the more standard Object.getPrototypeOf.
+    function getPrototypeOf(prototype) {
+      return prototype.__proto__;
+    }
+
+    // utility function to precompute name tags for functions
+    // in a (unchained) prototype
+    function hintSuper(prototype) {
+      // tag functions with their prototype name to optimize
+      // super call invocations
+      for (var n in prototype) {
+        var pd = Object.getOwnPropertyDescriptor(prototype, n);
+        if (pd && typeof pd.value === 'function') {
+          pd.value.nom = n;
+        }
+      }
+    }
+
+    // exports
+
+    scope.super = $super;
+
+})(Polymer);
+
+(function(scope) {
+
+  function noopHandler(value) {
+    return value;
+  }
+
+  // helper for deserializing properties of various types to strings
+  var typeHandlers = {
+    string: noopHandler,
+    'undefined': noopHandler,
+    date: function(value) {
+      return new Date(Date.parse(value) || Date.now());
+    },
+    boolean: function(value) {
+      if (value === '') {
+        return true;
+      }
+      return value === 'false' ? false : !!value;
+    },
+    number: function(value) {
+      var n = parseFloat(value);
+      // hex values like "0xFFFF" parseFloat as 0
+      if (n === 0) {
+        n = parseInt(value);
+      }
+      return isNaN(n) ? value : n;
+      // this code disabled because encoded values (like "0xFFFF")
+      // do not round trip to their original format
+      //return (String(floatVal) === value) ? floatVal : value;
+    },
+    object: function(value, currentValue) {
+      if (currentValue === null) {
+        return value;
+      }
+      try {
+        // If the string is an object, we can parse is with the JSON library.
+        // include convenience replace for single-quotes. If the author omits
+        // quotes altogether, parse will fail.
+        return JSON.parse(value.replace(/'/g, '"'));
+      } catch(e) {
+        // The object isn't valid JSON, return the raw value
+        return value;
+      }
+    },
+    // avoid deserialization of functions
+    'function': function(value, currentValue) {
+      return currentValue;
+    }
+  };
+
+  function deserializeValue(value, currentValue) {
+    // attempt to infer type from default value
+    var inferredType = typeof currentValue;
+    // invent 'date' type value for Date
+    if (currentValue instanceof Date) {
+      inferredType = 'date';
+    }
+    // delegate deserialization via type string
+    return typeHandlers[inferredType](value, currentValue);
+  }
+
+  // exports
+
+  scope.deserializeValue = deserializeValue;
+
+})(Polymer);
+
+(function(scope) {
+
+  // imports
+
+  var extend = scope.extend;
+
+  // module
+
+  var api = {};
+
+  api.declaration = {};
+  api.instance = {};
+
+  api.publish = function(apis, prototype) {
+    for (var n in apis) {
+      extend(prototype, apis[n]);
+    }
+  };
+
+  // exports
+
+  scope.api = api;
+
+})(Polymer);
+
+(function(scope) {
+
+  /**
+   * @class polymer-base
+   */
+
+  var utils = {
+
+    /**
+      * Invokes a function asynchronously. The context of the callback
+      * function is bound to 'this' automatically. Returns a handle which may 
+      * be passed to <a href="#cancelAsync">cancelAsync</a> to cancel the 
+      * asynchronous call.
+      *
+      * @method async
+      * @param {Function|String} method
+      * @param {any|Array} args
+      * @param {number} timeout
+      */
+    async: function(method, args, timeout) {
+      // when polyfilling Object.observe, ensure changes 
+      // propagate before executing the async method
+      Polymer.flush();
+      // second argument to `apply` must be an array
+      args = (args && args.length) ? args : [args];
+      // function to invoke
+      var fn = function() {
+        (this[method] || method).apply(this, args);
+      }.bind(this);
+      // execute `fn` sooner or later
+      var handle = timeout ? setTimeout(fn, timeout) :
+          requestAnimationFrame(fn);
+      // NOTE: switch on inverting handle to determine which time is used.
+      return timeout ? handle : ~handle;
+    },
+
+    /**
+      * Cancels a pending callback that was scheduled via 
+      * <a href="#async">async</a>. 
+      *
+      * @method cancelAsync
+      * @param {handle} handle Handle of the `async` to cancel.
+      */
+    cancelAsync: function(handle) {
+      if (handle < 0) {
+        cancelAnimationFrame(~handle);
+      } else {
+        clearTimeout(handle);
+      }
+    },
+
+    /**
+      * Fire an event.
+      *
+      * @method fire
+      * @returns {Object} event
+      * @param {string} type An event name.
+      * @param {any} detail
+      * @param {Node} onNode Target node.
+      * @param {Boolean} bubbles Set false to prevent bubbling, defaults to true
+      * @param {Boolean} cancelable Set false to prevent cancellation, defaults to true
+      */
+    fire: function(type, detail, onNode, bubbles, cancelable) {
+      var node = onNode || this;
+      var detail = detail === null || detail === undefined ? {} : detail;
+      var event = new CustomEvent(type, {
+        bubbles: bubbles !== undefined ? bubbles : true,
+        cancelable: cancelable !== undefined ? cancelable : true,
+        detail: detail
+      });
+      node.dispatchEvent(event);
+      return event;
+    },
+
+    /**
+      * Fire an event asynchronously.
+      *
+      * @method asyncFire
+      * @param {string} type An event name.
+      * @param detail
+      * @param {Node} toNode Target node.
+      */
+    asyncFire: function(/*inType, inDetail*/) {
+      this.async("fire", arguments);
+    },
+
+    /**
+      * Remove class from old, add class to anew, if they exist.
+      *
+      * @param classFollows
+      * @param anew A node.
+      * @param old A node
+      * @param className
+      */
+    classFollows: function(anew, old, className) {
+      if (old) {
+        old.classList.remove(className);
+      }
+      if (anew) {
+        anew.classList.add(className);
+      }
+    },
+
+    /**
+      * Inject HTML which contains markup bound to this element into
+      * a target element (replacing target element content).
+      *
+      * @param String html to inject
+      * @param Element target element
+      */
+    injectBoundHTML: function(html, element) {
+      var template = document.createElement('template');
+      template.innerHTML = html;
+      var fragment = this.instanceTemplate(template);
+      if (element) {
+        element.textContent = '';
+        element.appendChild(fragment);
+      }
+      return fragment;
+    }
+  };
+
+  // no-operation function for handy stubs
+  var nop = function() {};
+
+  // null-object for handy stubs
+  var nob = {};
+
+  // deprecated
+
+  utils.asyncMethod = utils.async;
+
+  // exports
+
+  scope.api.instance.utils = utils;
+  scope.nop = nop;
+  scope.nob = nob;
+
+})(Polymer);
+
+(function(scope) {
+
+  // imports
+
+  var log = window.WebComponents ? WebComponents.flags.log : {};
+  var EVENT_PREFIX = 'on-';
+
+  // instance events api
+  var events = {
+    // read-only
+    EVENT_PREFIX: EVENT_PREFIX,
+    // event listeners on host
+    addHostListeners: function() {
+      var events = this.eventDelegates;
+      log.events && (Object.keys(events).length > 0) && console.log('[%s] addHostListeners:', this.localName, events);
+      // NOTE: host events look like bindings but really are not;
+      // (1) we don't want the attribute to be set and (2) we want to support
+      // multiple event listeners ('host' and 'instance') and Node.bind
+      // by default supports 1 thing being bound.
+      for (var type in events) {
+        var methodName = events[type];
+        PolymerGestures.addEventListener(this, type, this.element.getEventHandler(this, this, methodName));
+      }
+    },
+    // call 'method' or function method on 'obj' with 'args', if the method exists
+    dispatchMethod: function(obj, method, args) {
+      if (obj) {
+        log.events && console.group('[%s] dispatch [%s]', obj.localName, method);
+        var fn = typeof method === 'function' ? method : obj[method];
+        if (fn) {
+          fn[args ? 'apply' : 'call'](obj, args);
+        }
+        log.events && console.groupEnd();
+        // NOTE: dirty check right after calling method to ensure 
+        // changes apply quickly; in a very complicated app using high 
+        // frequency events, this can be a perf concern; in this case,
+        // imperative handlers can be used to avoid flushing.
+        Polymer.flush();
+      }
+    }
+  };
+
+  // exports
+
+  scope.api.instance.events = events;
+
+  /**
+   * @class Polymer
+   */
+
+  /**
+   * Add a gesture aware event handler to the given `node`. Can be used 
+   * in place of `element.addEventListener` and ensures gestures will function
+   * as expected on mobile platforms. Please note that Polymer's declarative
+   * event handlers include this functionality by default.
+   * 
+   * @method addEventListener
+   * @param {Node} node node on which to listen
+   * @param {String} eventType name of the event
+   * @param {Function} handlerFn event handler function
+   * @param {Boolean} capture set to true to invoke event capturing
+   * @type Function
+   */
+  // alias PolymerGestures event listener logic
+  scope.addEventListener = function(node, eventType, handlerFn, capture) {
+    PolymerGestures.addEventListener(wrap(node), eventType, handlerFn, capture);
+  };
+
+  /**
+   * Remove a gesture aware event handler on the given `node`. To remove an
+   * event listener, the exact same arguments are required that were passed
+   * to `Polymer.addEventListener`.
+   * 
+   * @method removeEventListener
+   * @param {Node} node node on which to listen
+   * @param {String} eventType name of the event
+   * @param {Function} handlerFn event handler function
+   * @param {Boolean} capture set to true to invoke event capturing
+   * @type Function
+   */
+  scope.removeEventListener = function(node, eventType, handlerFn, capture) {
+    PolymerGestures.removeEventListener(wrap(node), eventType, handlerFn, capture);
+  };
+
+})(Polymer);
+
+(function(scope) {
+
+  // instance api for attributes
+
+  var attributes = {
+    // copy attributes defined in the element declaration to the instance
+    // e.g. <polymer-element name="x-foo" tabIndex="0"> tabIndex is copied
+    // to the element instance here.
+    copyInstanceAttributes: function () {
+      var a$ = this._instanceAttributes;
+      for (var k in a$) {
+        if (!this.hasAttribute(k)) {
+          this.setAttribute(k, a$[k]);
+        }
+      }
+    },
+    // for each attribute on this, deserialize value to property as needed
+    takeAttributes: function() {
+      // if we have no publish lookup table, we have no attributes to take
+      // TODO(sjmiles): ad hoc
+      if (this._publishLC) {
+        for (var i=0, a$=this.attributes, l=a$.length, a; (a=a$[i]) && i<l; i++) {
+          this.attributeToProperty(a.name, a.value);
+        }
+      }
+    },
+    // if attribute 'name' is mapped to a property, deserialize
+    // 'value' into that property
+    attributeToProperty: function(name, value) {
+      // try to match this attribute to a property (attributes are
+      // all lower-case, so this is case-insensitive search)
+      var name = this.propertyForAttribute(name);
+      if (name) {
+        // filter out 'mustached' values, these are to be
+        // replaced with bound-data and are not yet values
+        // themselves
+        if (value && value.search(scope.bindPattern) >= 0) {
+          return;
+        }
+        // get original value
+        var currentValue = this[name];
+        // deserialize Boolean or Number values from attribute
+        var value = this.deserializeValue(value, currentValue);
+        // only act if the value has changed
+        if (value !== currentValue) {
+          // install new value (has side-effects)
+          this[name] = value;
+        }
+      }
+    },
+    // return the published property matching name, or undefined
+    propertyForAttribute: function(name) {
+      var match = this._publishLC && this._publishLC[name];
+      return match;
+    },
+    // convert representation of `stringValue` based on type of `currentValue`
+    deserializeValue: function(stringValue, currentValue) {
+      return scope.deserializeValue(stringValue, currentValue);
+    },
+    // convert to a string value based on the type of `inferredType`
+    serializeValue: function(value, inferredType) {
+      if (inferredType === 'boolean') {
+        return value ? '' : undefined;
+      } else if (inferredType !== 'object' && inferredType !== 'function'
+          && value !== undefined) {
+        return value;
+      }
+    },
+    // serializes `name` property value and updates the corresponding attribute
+    // note that reflection is opt-in.
+    reflectPropertyToAttribute: function(name) {
+      var inferredType = typeof this[name];
+      // try to intelligently serialize property value
+      var serializedValue = this.serializeValue(this[name], inferredType);
+      // boolean properties must reflect as boolean attributes
+      if (serializedValue !== undefined) {
+        this.setAttribute(name, serializedValue);
+        // TODO(sorvell): we should remove attr for all properties
+        // that have undefined serialization; however, we will need to
+        // refine the attr reflection system to achieve this; pica, for example,
+        // relies on having inferredType object properties not removed as
+        // attrs.
+      } else if (inferredType === 'boolean') {
+        this.removeAttribute(name);
+      }
+    }
+  };
+
+  // exports
+
+  scope.api.instance.attributes = attributes;
+
+})(Polymer);
+
+(function(scope) {
+
+  /**
+   * @class polymer-base
+   */
+
+  // imports
+
+  var log = window.WebComponents ? WebComponents.flags.log : {};
+
+  // magic words
+
+  var OBSERVE_SUFFIX = 'Changed';
+
+  // element api
+
+  var empty = [];
+
+  var updateRecord = {
+    object: undefined,
+    type: 'update',
+    name: undefined,
+    oldValue: undefined
+  };
+
+  var numberIsNaN = Number.isNaN || function(value) {
+    return typeof value === 'number' && isNaN(value);
+  };
+
+  function areSameValue(left, right) {
+    if (left === right)
+      return left !== 0 || 1 / left === 1 / right;
+    if (numberIsNaN(left) && numberIsNaN(right))
+      return true;
+    return left !== left && right !== right;
+  }
+
+  // capture A's value if B's value is null or undefined,
+  // otherwise use B's value
+  function resolveBindingValue(oldValue, value) {
+    if (value === undefined && oldValue === null) {
+      return value;
+    }
+    return (value === null || value === undefined) ? oldValue : value;
+  }
+
+  var properties = {
+
+    // creates a CompoundObserver to observe property changes
+    // NOTE, this is only done there are any properties in the `observe` object
+    createPropertyObserver: function() {
+      var n$ = this._observeNames;
+      if (n$ && n$.length) {
+        var o = this._propertyObserver = new CompoundObserver(true);
+        this.registerObserver(o);
+        // TODO(sorvell): may not be kosher to access the value here (this[n]);
+        // previously we looked at the descriptor on the prototype
+        // this doesn't work for inheritance and not for accessors without
+        // a value property
+        for (var i=0, l=n$.length, n; (i<l) && (n=n$[i]); i++) {
+          o.addPath(this, n);
+          this.observeArrayValue(n, this[n], null);
+        }
+      }
+    },
+
+    // start observing property changes
+    openPropertyObserver: function() {
+      if (this._propertyObserver) {
+        this._propertyObserver.open(this.notifyPropertyChanges, this);
+      }
+    },
+
+    // handler for property changes; routes changes to observing methods
+    // note: array valued properties are observed for array splices
+    notifyPropertyChanges: function(newValues, oldValues, paths) {
+      var name, method, called = {};
+      for (var i in oldValues) {
+        // note: paths is of form [object, path, object, path]
+        name = paths[2 * i + 1];
+        method = this.observe[name];
+        if (method) {
+          var ov = oldValues[i], nv = newValues[i];
+          // observes the value if it is an array
+          this.observeArrayValue(name, nv, ov);
+          if (!called[method]) {
+            // only invoke change method if one of ov or nv is not (undefined | null)
+            if ((ov !== undefined && ov !== null) || (nv !== undefined && nv !== null)) {
+              called[method] = true;
+              // TODO(sorvell): call method with the set of values it's expecting;
+              // e.g. 'foo bar': 'invalidate' expects the new and old values for
+              // foo and bar. Currently we give only one of these and then
+              // deliver all the arguments.
+              this.invokeMethod(method, [ov, nv, arguments]);
+            }
+          }
+        }
+      }
+    },
+
+    // call method iff it exists.
+    invokeMethod: function(method, args) {
+      var fn = this[method] || method;
+      if (typeof fn === 'function') {
+        fn.apply(this, args);
+      }
+    },
+
+    /**
+     * Force any pending property changes to synchronously deliver to
+     * handlers specified in the `observe` object.
+     * Note, normally changes are processed at microtask time.
+     *
+     * @method deliverChanges
+     */
+    deliverChanges: function() {
+      if (this._propertyObserver) {
+        this._propertyObserver.deliver();
+      }
+    },
+
+    observeArrayValue: function(name, value, old) {
+      // we only care if there are registered side-effects
+      var callbackName = this.observe[name];
+      if (callbackName) {
+        // if we are observing the previous value, stop
+        if (Array.isArray(old)) {
+          log.observe && console.log('[%s] observeArrayValue: unregister observer [%s]', this.localName, name);
+          this.closeNamedObserver(name + '__array');
+        }
+        // if the new value is an array, being observing it
+        if (Array.isArray(value)) {
+          log.observe && console.log('[%s] observeArrayValue: register observer [%s]', this.localName, name, value);
+          var observer = new ArrayObserver(value);
+          observer.open(function(splices) {
+            this.invokeMethod(callbackName, [splices]);
+          }, this);
+          this.registerNamedObserver(name + '__array', observer);
+        }
+      }
+    },
+
+    emitPropertyChangeRecord: function(name, value, oldValue) {
+      var object = this;
+      if (areSameValue(value, oldValue)) {
+        return;
+      }
+      // invoke property change side effects
+      this._propertyChanged(name, value, oldValue);
+      // emit change record
+      if (!Observer.hasObjectObserve) {
+        return;
+      }
+      var notifier = this._objectNotifier;
+      if (!notifier) {
+        notifier = this._objectNotifier = Object.getNotifier(this);
+      }
+      updateRecord.object = this;
+      updateRecord.name = name;
+      updateRecord.oldValue = oldValue;
+      notifier.notify(updateRecord);
+    },
+
+    _propertyChanged: function(name, value, oldValue) {
+      if (this.reflect[name]) {
+        this.reflectPropertyToAttribute(name);
+      }
+    },
+
+    // creates a property binding (called via bind) to a published property.
+    bindProperty: function(property, observable, oneTime) {
+      if (oneTime) {
+        this[property] = observable;
+        return;
+      }
+      var computed = this.element.prototype.computed;
+      // Binding an "out-only" value to a computed property. Note that
+      // since this observer isn't opened, it doesn't need to be closed on
+      // cleanup.
+      if (computed && computed[property]) {
+        var privateComputedBoundValue = property + 'ComputedBoundObservable_';
+        this[privateComputedBoundValue] = observable;
+        return;
+      }
+      return this.bindToAccessor(property, observable, resolveBindingValue);
+    },
+
+    // NOTE property `name` must be published. This makes it an accessor.
+    bindToAccessor: function(name, observable, resolveFn) {
+      var privateName = name + '_';
+      var privateObservable  = name + 'Observable_';
+      // Present for properties which are computed and published and have a
+      // bound value.
+      var privateComputedBoundValue = name + 'ComputedBoundObservable_';
+      this[privateObservable] = observable;
+      var oldValue = this[privateName];
+      // observable callback
+      var self = this;
+      function updateValue(value, oldValue) {
+        self[privateName] = value;
+        var setObserveable = self[privateComputedBoundValue];
+        if (setObserveable && typeof setObserveable.setValue == 'function') {
+          setObserveable.setValue(value);
+        }
+        self.emitPropertyChangeRecord(name, value, oldValue);
+      }
+      // resolve initial value
+      var value = observable.open(updateValue);
+      if (resolveFn && !areSameValue(oldValue, value)) {
+        var resolvedValue = resolveFn(oldValue, value);
+        if (!areSameValue(value, resolvedValue)) {
+          value = resolvedValue;
+          if (observable.setValue) {
+            observable.setValue(value);
+          }
+        }
+      }
+      updateValue(value, oldValue);
+      // register and return observable
+      var observer = {
+        close: function() {
+          observable.close();
+          self[privateObservable] = undefined;
+          self[privateComputedBoundValue] = undefined;
+        }
+      };
+      this.registerObserver(observer);
+      return observer;
+    },
+
+    createComputedProperties: function() {
+      if (!this._computedNames) {
+        return;
+      }
+      for (var i = 0; i < this._computedNames.length; i++) {
+        var name = this._computedNames[i];
+        var expressionText = this.computed[name];
+        try {
+          var expression = PolymerExpressions.getExpression(expressionText);
+          var observable = expression.getBinding(this, this.element.syntax);
+          this.bindToAccessor(name, observable);
+        } catch (ex) {
+          console.error('Failed to create computed property', ex);
+        }
+      }
+    },
+
+    // property bookkeeping
+    registerObserver: function(observer) {
+      if (!this._observers) {
+        this._observers = [observer];
+        return;
+      }
+      this._observers.push(observer);
+    },
+
+    closeObservers: function() {
+      if (!this._observers) {
+        return;
+      }
+      // observer array items are arrays of observers.
+      var observers = this._observers;
+      for (var i = 0; i < observers.length; i++) {
+        var observer = observers[i];
+        if (observer && typeof observer.close == 'function') {
+          observer.close();
+        }
+      }
+      this._observers = [];
+    },
+
+    // bookkeeping observers for memory management
+    registerNamedObserver: function(name, observer) {
+      var o$ = this._namedObservers || (this._namedObservers = {});
+      o$[name] = observer;
+    },
+
+    closeNamedObserver: function(name) {
+      var o$ = this._namedObservers;
+      if (o$ && o$[name]) {
+        o$[name].close();
+        o$[name] = null;
+        return true;
+      }
+    },
+
+    closeNamedObservers: function() {
+      if (this._namedObservers) {
+        for (var i in this._namedObservers) {
+          this.closeNamedObserver(i);
+        }
+        this._namedObservers = {};
+      }
+    }
+
+  };
+
+  // logging
+  var LOG_OBSERVE = '[%s] watching [%s]';
+  var LOG_OBSERVED = '[%s#%s] watch: [%s] now [%s] was [%s]';
+  var LOG_CHANGED = '[%s#%s] propertyChanged: [%s] now [%s] was [%s]';
+
+  // exports
+
+  scope.api.instance.properties = properties;
+
+})(Polymer);
+
+(function(scope) {
+
+  /**
+   * @class polymer-base
+   */
+
+  // imports
+
+  var log = window.WebComponents ? WebComponents.flags.log : {};
+
+  // element api supporting mdv
+  var mdv = {
+
+    /**
+     * Creates dom cloned from the given template, instantiating bindings
+     * with this element as the template model and `PolymerExpressions` as the
+     * binding delegate.
+     *
+     * @method instanceTemplate
+     * @param {Template} template source template from which to create dom.
+     */
+    instanceTemplate: function(template) {
+      // ensure template is decorated (lets' things like <tr template ...> work)
+      HTMLTemplateElement.decorate(template);
+      // ensure a default bindingDelegate
+      var syntax = this.syntax || (!template.bindingDelegate &&
+          this.element.syntax);
+      var dom = template.createInstance(this, syntax);
+      var observers = dom.bindings_;
+      for (var i = 0; i < observers.length; i++) {
+        this.registerObserver(observers[i]);
+      }
+      return dom;
+    },
+
+    // Called by TemplateBinding/NodeBind to setup a binding to the given
+    // property. It's overridden here to support property bindings
+    // in addition to attribute bindings that are supported by default.
+    bind: function(name, observable, oneTime) {
+      var property = this.propertyForAttribute(name);
+      if (!property) {
+        // TODO(sjmiles): this mixin method must use the special form
+        // of `super` installed by `mixinMethod` in declaration/prototype.js
+        return this.mixinSuper(arguments);
+      } else {
+        // use n-way Polymer binding
+        var observer = this.bindProperty(property, observable, oneTime);
+        // NOTE: reflecting binding information is typically required only for
+        // tooling. It has a performance cost so it's opt-in in Node.bind.
+        if (Platform.enableBindingsReflection && observer) {
+          observer.path = observable.path_;
+          this._recordBinding(property, observer);
+        }
+        if (this.reflect[property]) {
+          this.reflectPropertyToAttribute(property);
+        }
+        return observer;
+      }
+    },
+
+    _recordBinding: function(name, observer) {
+      this.bindings_ = this.bindings_ || {};
+      this.bindings_[name] = observer;
+    },
+
+    // Called by TemplateBinding when all bindings on an element have been 
+    // executed. This signals that all element inputs have been gathered
+    // and it's safe to ready the element, create shadow-root and start
+    // data-observation.
+    bindFinished: function() {
+      this.makeElementReady();
+    },
+
+    // called at detached time to signal that an element's bindings should be
+    // cleaned up. This is done asynchronously so that users have the chance
+    // to call `cancelUnbindAll` to prevent unbinding.
+    asyncUnbindAll: function() {
+      if (!this._unbound) {
+        log.unbind && console.log('[%s] asyncUnbindAll', this.localName);
+        this._unbindAllJob = this.job(this._unbindAllJob, this.unbindAll, 0);
+      }
+    },
+    
+    /**
+     * This method should rarely be used and only if 
+     * <a href="#cancelUnbindAll">`cancelUnbindAll`</a> has been called to 
+     * prevent element unbinding. In this case, the element's bindings will 
+     * not be automatically cleaned up and it cannot be garbage collected 
+     * by the system. If memory pressure is a concern or a 
+     * large amount of elements need to be managed in this way, `unbindAll`
+     * can be called to deactivate the element's bindings and allow its 
+     * memory to be reclaimed.
+     *
+     * @method unbindAll
+     */
+    unbindAll: function() {
+      if (!this._unbound) {
+        this.closeObservers();
+        this.closeNamedObservers();
+        this._unbound = true;
+      }
+    },
+
+    /**
+     * Call in `detached` to prevent the element from unbinding when it is 
+     * detached from the dom. The element is unbound as a cleanup step that 
+     * allows its memory to be reclaimed. 
+     * If `cancelUnbindAll` is used, consider calling 
+     * <a href="#unbindAll">`unbindAll`</a> when the element is no longer
+     * needed. This will allow its memory to be reclaimed.
+     * 
+     * @method cancelUnbindAll
+     */
+    cancelUnbindAll: function() {
+      if (this._unbound) {
+        log.unbind && console.warn('[%s] already unbound, cannot cancel unbindAll', this.localName);
+        return;
+      }
+      log.unbind && console.log('[%s] cancelUnbindAll', this.localName);
+      if (this._unbindAllJob) {
+        this._unbindAllJob = this._unbindAllJob.stop();
+      }
+    }
+
+  };
+
+  function unbindNodeTree(node) {
+    forNodeTree(node, _nodeUnbindAll);
+  }
+
+  function _nodeUnbindAll(node) {
+    node.unbindAll();
+  }
+
+  function forNodeTree(node, callback) {
+    if (node) {
+      callback(node);
+      for (var child = node.firstChild; child; child = child.nextSibling) {
+        forNodeTree(child, callback);
+      }
+    }
+  }
+
+  var mustachePattern = /\{\{([^{}]*)}}/;
+
+  // exports
+
+  scope.bindPattern = mustachePattern;
+  scope.api.instance.mdv = mdv;
+
+})(Polymer);
+
+(function(scope) {
+
+  /**
+   * Common prototype for all Polymer Elements.
+   * 
+   * @class polymer-base
+   * @homepage polymer.github.io
+   */
+  var base = {
+    /**
+     * Tags this object as the canonical Base prototype.
+     *
+     * @property PolymerBase
+     * @type boolean
+     * @default true
+     */
+    PolymerBase: true,
+
+    /**
+     * Debounce signals. 
+     * 
+     * Call `job` to defer a named signal, and all subsequent matching signals, 
+     * until a wait time has elapsed with no new signal.
+     * 
+     *     debouncedClickAction: function(e) {
+     *       // processClick only when it's been 100ms since the last click
+     *       this.job('click', function() {
+     *        this.processClick;
+     *       }, 100);
+     *     }
+     *
+     * @method job
+     * @param String {String} job A string identifier for the job to debounce.
+     * @param Function {Function} callback A function that is called (with `this` context) when the wait time elapses.
+     * @param Number {Number} wait Time in milliseconds (ms) after the last signal that must elapse before invoking `callback`
+     * @type Handle
+     */
+    job: function(job, callback, wait) {
+      if (typeof job === 'string') {
+        var n = '___' + job;
+        this[n] = Polymer.job.call(this, this[n], callback, wait);
+      } else {
+        // TODO(sjmiles): suggest we deprecate this call signature
+        return Polymer.job.call(this, job, callback, wait);
+      }
+    },
+
+    /**
+     * Invoke a superclass method. 
+     * 
+     * Use `super()` to invoke the most recently overridden call to the 
+     * currently executing function. 
+     * 
+     * To pass arguments through, use the literal `arguments` as the parameter 
+     * to `super()`.
+     *
+     *     nextPageAction: function(e) {
+     *       // invoke the superclass version of `nextPageAction`
+     *       this.super(arguments); 
+     *     }
+     *
+     * To pass custom arguments, arrange them in an array.
+     *
+     *     appendSerialNo: function(value, serial) {
+     *       // prefix the superclass serial number with our lot # before
+     *       // invoking the superlcass
+     *       return this.super([value, this.lotNo + serial])
+     *     }
+     *
+     * @method super
+     * @type Any
+     * @param {args) An array of arguments to use when calling the superclass method, or null.
+     */
+    super: Polymer.super,
+
+    /**
+     * Lifecycle method called when the element is instantiated.
+     * 
+     * Override `created` to perform custom create-time tasks. No need to call 
+     * super-class `created` unless you are extending another Polymer element.
+     * Created is called before the element creates `shadowRoot` or prepares
+     * data-observation.
+     * 
+     * @method created
+     * @type void
+     */
+    created: function() {
+    },
+
+    /**
+     * Lifecycle method called when the element has populated it's `shadowRoot`,
+     * prepared data-observation, and made itself ready for API interaction.
+     * 
+     * @method ready
+     * @type void
+     */
+    ready: function() {
+    },
+
+    /**
+     * Low-level lifecycle method called as part of standard Custom Elements
+     * operation. Polymer implements this method to provide basic default 
+     * functionality. For custom create-time tasks, implement `created` 
+     * instead, which is called immediately after `createdCallback`. 
+     * 
+     * @method createdCallback
+     */
+    createdCallback: function() {
+      if (this.templateInstance && this.templateInstance.model) {
+        console.warn('Attributes on ' + this.localName + ' were data bound ' +
+            'prior to Polymer upgrading the element. This may result in ' +
+            'incorrect binding types.');
+      }
+      this.created();
+      this.prepareElement();
+      if (!this.ownerDocument.isStagingDocument) {
+        this.makeElementReady();
+      }
+    },
+
+    // system entry point, do not override
+    prepareElement: function() {
+      if (this._elementPrepared) {
+        console.warn('Element already prepared', this.localName);
+        return;
+      }
+      this._elementPrepared = true;
+      // storage for shadowRoots info
+      this.shadowRoots = {};
+      // install property observers
+      this.createPropertyObserver();
+      this.openPropertyObserver();
+      // install boilerplate attributes
+      this.copyInstanceAttributes();
+      // process input attributes
+      this.takeAttributes();
+      // add event listeners
+      this.addHostListeners();
+    },
+
+    // system entry point, do not override
+    makeElementReady: function() {
+      if (this._readied) {
+        return;
+      }
+      this._readied = true;
+      this.createComputedProperties();
+      this.parseDeclarations(this.__proto__);
+      // NOTE: Support use of the `unresolved` attribute to help polyfill
+      // custom elements' `:unresolved` feature.
+      this.removeAttribute('unresolved');
+      // user entry point
+      this.ready();
+    },
+
+    /**
+     * Low-level lifecycle method called as part of standard Custom Elements
+     * operation. Polymer implements this method to provide basic default 
+     * functionality. For custom tasks in your element, implement `attributeChanged` 
+     * instead, which is called immediately after `attributeChangedCallback`. 
+     * 
+     * @method attributeChangedCallback
+     */
+    attributeChangedCallback: function(name, oldValue) {
+      // TODO(sjmiles): adhoc filter
+      if (name !== 'class' && name !== 'style') {
+        this.attributeToProperty(name, this.getAttribute(name));
+      }
+      if (this.attributeChanged) {
+        this.attributeChanged.apply(this, arguments);
+      }
+    },
+
+    /**
+     * Low-level lifecycle method called as part of standard Custom Elements
+     * operation. Polymer implements this method to provide basic default 
+     * functionality. For custom create-time tasks, implement `attached` 
+     * instead, which is called immediately after `attachedCallback`. 
+     * 
+     * @method attachedCallback
+     */
+     attachedCallback: function() {
+      // when the element is attached, prevent it from unbinding.
+      this.cancelUnbindAll();
+      // invoke user action
+      if (this.attached) {
+        this.attached();
+      }
+      if (!this.hasBeenAttached) {
+        this.hasBeenAttached = true;
+        if (this.domReady) {
+          this.async('domReady');
+        }
+      }
+    },
+
+     /**
+     * Implement to access custom elements in dom descendants, ancestors, 
+     * or siblings. Because custom elements upgrade in document order, 
+     * elements accessed in `ready` or `attached` may not be upgraded. When
+     * `domReady` is called, all registered custom elements are guaranteed
+     * to have been upgraded.
+     * 
+     * @method domReady
+     */
+
+    /**
+     * Low-level lifecycle method called as part of standard Custom Elements
+     * operation. Polymer implements this method to provide basic default 
+     * functionality. For custom create-time tasks, implement `detached` 
+     * instead, which is called immediately after `detachedCallback`. 
+     * 
+     * @method detachedCallback
+     */
+    detachedCallback: function() {
+      if (!this.preventDispose) {
+        this.asyncUnbindAll();
+      }
+      // invoke user action
+      if (this.detached) {
+        this.detached();
+      }
+      // TODO(sorvell): bc
+      if (this.leftView) {
+        this.leftView();
+      }
+    },
+
+    /**
+     * Walks the prototype-chain of this element and allows specific
+     * classes a chance to process static declarations.
+     * 
+     * In particular, each polymer-element has it's own `template`.
+     * `parseDeclarations` is used to accumulate all element `template`s
+     * from an inheritance chain.
+     *
+     * `parseDeclaration` static methods implemented in the chain are called
+     * recursively, oldest first, with the `<polymer-element>` associated
+     * with the current prototype passed as an argument.
+     * 
+     * An element may override this method to customize shadow-root generation. 
+     * 
+     * @method parseDeclarations
+     */
+    parseDeclarations: function(p) {
+      if (p && p.element) {
+        this.parseDeclarations(p.__proto__);
+        p.parseDeclaration.call(this, p.element);
+      }
+    },
+
+    /**
+     * Perform init-time actions based on static information in the
+     * `<polymer-element>` instance argument.
+     *
+     * For example, the standard implementation locates the template associated
+     * with the given `<polymer-element>` and stamps it into a shadow-root to
+     * implement shadow inheritance.
+     *  
+     * An element may override this method for custom behavior. 
+     * 
+     * @method parseDeclaration
+     */
+    parseDeclaration: function(elementElement) {
+      var template = this.fetchTemplate(elementElement);
+      if (template) {
+        var root = this.shadowFromTemplate(template);
+        this.shadowRoots[elementElement.name] = root;
+      }
+    },
+
+    /**
+     * Given a `<polymer-element>`, find an associated template (if any) to be
+     * used for shadow-root generation.
+     *
+     * An element may override this method for custom behavior. 
+     * 
+     * @method fetchTemplate
+     */
+    fetchTemplate: function(elementElement) {
+      return elementElement.querySelector('template');
+    },
+
+    /**
+     * Create a shadow-root in this host and stamp `template` as it's 
+     * content. 
+     *
+     * An element may override this method for custom behavior. 
+     * 
+     * @method shadowFromTemplate
+     */
+    shadowFromTemplate: function(template) {
+      if (template) {
+        // make a shadow root
+        var root = this.createShadowRoot();
+        // stamp template
+        // which includes parsing and applying MDV bindings before being
+        // inserted (to avoid {{}} in attribute values)
+        // e.g. to prevent <img src="images/{{icon}}"> from generating a 404.
+        var dom = this.instanceTemplate(template);
+        // append to shadow dom
+        root.appendChild(dom);
+        // perform post-construction initialization tasks on shadow root
+        this.shadowRootReady(root, template);
+        // return the created shadow root
+        return root;
+      }
+    },
+
+    // utility function that stamps a <template> into light-dom
+    lightFromTemplate: function(template, refNode) {
+      if (template) {
+        // TODO(sorvell): mark this element as an eventController so that
+        // event listeners on bound nodes inside it will be called on it.
+        // Note, the expectation here is that events on all descendants
+        // should be handled by this element.
+        this.eventController = this;
+        // stamp template
+        // which includes parsing and applying MDV bindings before being
+        // inserted (to avoid {{}} in attribute values)
+        // e.g. to prevent <img src="images/{{icon}}"> from generating a 404.
+        var dom = this.instanceTemplate(template);
+        // append to shadow dom
+        if (refNode) {
+          this.insertBefore(dom, refNode);
+        } else {
+          this.appendChild(dom);
+        }
+        // perform post-construction initialization tasks on ahem, light root
+        this.shadowRootReady(this);
+        // return the created shadow root
+        return dom;
+      }
+    },
+
+    shadowRootReady: function(root) {
+      // locate nodes with id and store references to them in this.$ hash
+      this.marshalNodeReferences(root);
+    },
+
+    // locate nodes with id and store references to them in this.$ hash
+    marshalNodeReferences: function(root) {
+      // establish $ instance variable
+      var $ = this.$ = this.$ || {};
+      // populate $ from nodes with ID from the LOCAL tree
+      if (root) {
+        var n$ = root.querySelectorAll("[id]");
+        for (var i=0, l=n$.length, n; (i<l) && (n=n$[i]); i++) {
+          $[n.id] = n;
+        };
+      }
+    },
+
+    /**
+     * Register a one-time callback when a child-list or sub-tree mutation
+     * occurs on node. 
+     *
+     * For persistent callbacks, call onMutation from your listener. 
+     * 
+     * @method onMutation
+     * @param Node {Node} node Node to watch for mutations.
+     * @param Function {Function} listener Function to call on mutation. The function is invoked as `listener.call(this, observer, mutations);` where `observer` is the MutationObserver that triggered the notification, and `mutations` is the native mutation list.
+     */
+    onMutation: function(node, listener) {
+      var observer = new MutationObserver(function(mutations) {
+        listener.call(this, observer, mutations);
+        observer.disconnect();
+      }.bind(this));
+      observer.observe(node, {childList: true, subtree: true});
+    }
+  };
+
+  /**
+   * @class Polymer
+   */
+  
+  /**
+   * Returns true if the object includes <a href="#polymer-base">polymer-base</a> in it's prototype chain.
+   * 
+   * @method isBase
+   * @param Object {Object} object Object to test.
+   * @type Boolean
+   */
+  function isBase(object) {
+    return object.hasOwnProperty('PolymerBase')
+  }
+
+  // name a base constructor for dev tools
+
+  /**
+   * The Polymer base-class constructor.
+   * 
+   * @property Base
+   * @type Function
+   */
+  function PolymerBase() {};
+  PolymerBase.prototype = base;
+  base.constructor = PolymerBase;
+
+  // exports
+
+  scope.Base = PolymerBase;
+  scope.isBase = isBase;
+  scope.api.instance.base = base;
+
+})(Polymer);
+
+(function(scope) {
+
+  // imports
+
+  var log = window.WebComponents ? WebComponents.flags.log : {};
+  var hasShadowDOMPolyfill = window.ShadowDOMPolyfill;
+
+  // magic words
+  
+  var STYLE_SCOPE_ATTRIBUTE = 'element';
+  var STYLE_CONTROLLER_SCOPE = 'controller';
+  
+  var styles = {
+    STYLE_SCOPE_ATTRIBUTE: STYLE_SCOPE_ATTRIBUTE,
+    /**
+     * Installs external stylesheets and <style> elements with the attribute 
+     * polymer-scope='controller' into the scope of element. This is intended
+     * to be a called during custom element construction.
+    */
+    installControllerStyles: function() {
+      // apply controller styles, but only if they are not yet applied
+      var scope = this.findStyleScope();
+      if (scope && !this.scopeHasNamedStyle(scope, this.localName)) {
+        // allow inherited controller styles
+        var proto = getPrototypeOf(this), cssText = '';
+        while (proto && proto.element) {
+          cssText += proto.element.cssTextForScope(STYLE_CONTROLLER_SCOPE);
+          proto = getPrototypeOf(proto);
+        }
+        if (cssText) {
+          this.installScopeCssText(cssText, scope);
+        }
+      }
+    },
+    installScopeStyle: function(style, name, scope) {
+      var scope = scope || this.findStyleScope(), name = name || '';
+      if (scope && !this.scopeHasNamedStyle(scope, this.localName + name)) {
+        var cssText = '';
+        if (style instanceof Array) {
+          for (var i=0, l=style.length, s; (i<l) && (s=style[i]); i++) {
+            cssText += s.textContent + '\n\n';
+          }
+        } else {
+          cssText = style.textContent;
+        }
+        this.installScopeCssText(cssText, scope, name);
+      }
+    },
+    installScopeCssText: function(cssText, scope, name) {
+      scope = scope || this.findStyleScope();
+      name = name || '';
+      if (!scope) {
+        return;
+      }
+      if (hasShadowDOMPolyfill) {
+        cssText = shimCssText(cssText, scope.host);
+      }
+      var style = this.element.cssTextToScopeStyle(cssText,
+          STYLE_CONTROLLER_SCOPE);
+      Polymer.applyStyleToScope(style, scope);
+      // cache that this style has been applied
+      this.styleCacheForScope(scope)[this.localName + name] = true;
+    },
+    findStyleScope: function(node) {
+      // find the shadow root that contains this element
+      var n = node || this;
+      while (n.parentNode) {
+        n = n.parentNode;
+      }
+      return n;
+    },
+    scopeHasNamedStyle: function(scope, name) {
+      var cache = this.styleCacheForScope(scope);
+      return cache[name];
+    },
+    styleCacheForScope: function(scope) {
+      if (hasShadowDOMPolyfill) {
+        var scopeName = scope.host ? scope.host.localName : scope.localName;
+        return polyfillScopeStyleCache[scopeName] || (polyfillScopeStyleCache[scopeName] = {});
+      } else {
+        return scope._scopeStyles = (scope._scopeStyles || {});
+      }
+    }
+  };
+
+  var polyfillScopeStyleCache = {};
+  
+  // NOTE: use raw prototype traversal so that we ensure correct traversal
+  // on platforms where the protoype chain is simulated via __proto__ (IE10)
+  function getPrototypeOf(prototype) {
+    return prototype.__proto__;
+  }
+
+  function shimCssText(cssText, host) {
+    var name = '', is = false;
+    if (host) {
+      name = host.localName;
+      is = host.hasAttribute('is');
+    }
+    var selector = WebComponents.ShadowCSS.makeScopeSelector(name, is);
+    return WebComponents.ShadowCSS.shimCssText(cssText, selector);
+  }
+
+  // exports
+
+  scope.api.instance.styles = styles;
+  
+})(Polymer);
+
+(function(scope) {
+
+  // imports
+
+  var extend = scope.extend;
+  var api = scope.api;
+
+  // imperative implementation: Polymer()
+
+  // specify an 'own' prototype for tag `name`
+  function element(name, prototype) {
+    if (typeof name !== 'string') {
+      var script = prototype || document._currentScript;
+      prototype = name;
+      name = script && script.parentNode && script.parentNode.getAttribute ?
+          script.parentNode.getAttribute('name') : '';
+      if (!name) {
+        throw 'Element name could not be inferred.';
+      }
+    }
+    if (getRegisteredPrototype(name)) {
+      throw 'Already registered (Polymer) prototype for element ' + name;
+    }
+    // cache the prototype
+    registerPrototype(name, prototype);
+    // notify the registrar waiting for 'name', if any
+    notifyPrototype(name);
+  }
+
+  // async prototype source
+
+  function waitingForPrototype(name, client) {
+    waitPrototype[name] = client;
+  }
+
+  var waitPrototype = {};
+
+  function notifyPrototype(name) {
+    if (waitPrototype[name]) {
+      waitPrototype[name].registerWhenReady();
+      delete waitPrototype[name];
+    }
+  }
+
+  // utility and bookkeeping
+
+  // maps tag names to prototypes, as registered with
+  // Polymer. Prototypes associated with a tag name
+  // using document.registerElement are available from
+  // HTMLElement.getPrototypeForTag().
+  // If an element was fully registered by Polymer, then
+  // Polymer.getRegisteredPrototype(name) === 
+  //   HTMLElement.getPrototypeForTag(name)
+
+  var prototypesByName = {};
+
+  function registerPrototype(name, prototype) {
+    return prototypesByName[name] = prototype || {};
+  }
+
+  function getRegisteredPrototype(name) {
+    return prototypesByName[name];
+  }
+
+  function instanceOfType(element, type) {
+    if (typeof type !== 'string') {
+      return false;
+    }
+    var proto = HTMLElement.getPrototypeForTag(type);
+    var ctor = proto && proto.constructor;
+    if (!ctor) {
+      return false;
+    }
+    if (CustomElements.instanceof) {
+      return CustomElements.instanceof(element, ctor);
+    }
+    return element instanceof ctor;
+  }
+
+  // exports
+
+  scope.getRegisteredPrototype = getRegisteredPrototype;
+  scope.waitingForPrototype = waitingForPrototype;
+  scope.instanceOfType = instanceOfType;
+
+  // namespace shenanigans so we can expose our scope on the registration 
+  // function
+
+  // make window.Polymer reference `element()`
+
+  window.Polymer = element;
+
+  // TODO(sjmiles): find a way to do this that is less terrible
+  // copy window.Polymer properties onto `element()`
+
+  extend(Polymer, scope);
+
+  // Under the HTMLImports polyfill, scripts in the main document
+  // do not block on imports; we want to allow calls to Polymer in the main
+  // document. WebComponents collects those calls until we can process them, which
+  // we do here.
+
+  if (WebComponents.consumeDeclarations) {
+    WebComponents.consumeDeclarations(function(declarations) {
+      if (declarations) {
+        for (var i=0, l=declarations.length, d; (i<l) && (d=declarations[i]); i++) {
+          element.apply(null, d);
+        }
+      }
+    });
+  }
+
+})(Polymer);
+
+(function(scope) {
+
+/**
+ * @class polymer-base
+ */
+
+ /**
+  * Resolve a url path to be relative to a `base` url. If unspecified, `base`
+  * defaults to the element's ownerDocument url. Can be used to resolve
+  * paths from element's in templates loaded in HTMLImports to be relative
+  * to the document containing the element. Polymer automatically does this for
+  * url attributes in element templates; however, if a url, for
+  * example, contains a binding, then `resolvePath` can be used to ensure it is 
+  * relative to the element document. For example, in an element's template,
+  *
+  *     <a href="{{resolvePath(path)}}">Resolved</a>
+  * 
+  * @method resolvePath
+  * @param {String} url Url path to resolve.
+  * @param {String} base Optional base url against which to resolve, defaults
+  * to the element's ownerDocument url.
+  * returns {String} resolved url.
+  */
+
+var path = {
+  resolveElementPaths: function(node) {
+    Polymer.urlResolver.resolveDom(node);
+  },
+  addResolvePathApi: function() {
+    // let assetpath attribute modify the resolve path
+    var assetPath = this.getAttribute('assetpath') || '';
+    var root = new URL(assetPath, this.ownerDocument.baseURI);
+    this.prototype.resolvePath = function(urlPath, base) {
+      var u = new URL(urlPath, base || root);
+      return u.href;
+    };
+  }
+};
+
+// exports
+scope.api.declaration.path = path;
+
+})(Polymer);
+
+(function(scope) {
+
+  // imports
+
+  var log = window.WebComponents ? WebComponents.flags.log : {};
+  var api = scope.api.instance.styles;
+  var STYLE_SCOPE_ATTRIBUTE = api.STYLE_SCOPE_ATTRIBUTE;
+
+  var hasShadowDOMPolyfill = window.ShadowDOMPolyfill;
+
+  // magic words
+
+  var STYLE_SELECTOR = 'style';
+  var STYLE_LOADABLE_MATCH = '@import';
+  var SHEET_SELECTOR = 'link[rel=stylesheet]';
+  var STYLE_GLOBAL_SCOPE = 'global';
+  var SCOPE_ATTR = 'polymer-scope';
+
+  var styles = {
+    // returns true if resources are loading
+    loadStyles: function(callback) {
+      var template = this.fetchTemplate();
+      var content = template && this.templateContent();
+      if (content) {
+        this.convertSheetsToStyles(content);
+        var styles = this.findLoadableStyles(content);
+        if (styles.length) {
+          var templateUrl = template.ownerDocument.baseURI;
+          return Polymer.styleResolver.loadStyles(styles, templateUrl, callback);
+        }
+      }
+      if (callback) {
+        callback();
+      }
+    },
+    convertSheetsToStyles: function(root) {
+      var s$ = root.querySelectorAll(SHEET_SELECTOR);
+      for (var i=0, l=s$.length, s, c; (i<l) && (s=s$[i]); i++) {
+        c = createStyleElement(importRuleForSheet(s, this.ownerDocument.baseURI),
+            this.ownerDocument);
+        this.copySheetAttributes(c, s);
+        s.parentNode.replaceChild(c, s);
+      }
+    },
+    copySheetAttributes: function(style, link) {
+      for (var i=0, a$=link.attributes, l=a$.length, a; (a=a$[i]) && i<l; i++) {
+        if (a.name !== 'rel' && a.name !== 'href') {
+          style.setAttribute(a.name, a.value);
+        }
+      }
+    },
+    findLoadableStyles: function(root) {
+      var loadables = [];
+      if (root) {
+        var s$ = root.querySelectorAll(STYLE_SELECTOR);
+        for (var i=0, l=s$.length, s; (i<l) && (s=s$[i]); i++) {
+          if (s.textContent.match(STYLE_LOADABLE_MATCH)) {
+            loadables.push(s);
+          }
+        }
+      }
+      return loadables;
+    },
+    /**
+     * Install external stylesheets loaded in <polymer-element> elements into the 
+     * element's template.
+     * @param elementElement The <element> element to style.
+     */
+    installSheets: function() {
+      this.cacheSheets();
+      this.cacheStyles();
+      this.installLocalSheets();
+      this.installGlobalStyles();
+    },
+    /**
+     * Remove all sheets from element and store for later use.
+     */
+    cacheSheets: function() {
+      this.sheets = this.findNodes(SHEET_SELECTOR);
+      this.sheets.forEach(function(s) {
+        if (s.parentNode) {
+          s.parentNode.removeChild(s);
+        }
+      });
+    },
+    cacheStyles: function() {
+      this.styles = this.findNodes(STYLE_SELECTOR + '[' + SCOPE_ATTR + ']');
+      this.styles.forEach(function(s) {
+        if (s.parentNode) {
+          s.parentNode.removeChild(s);
+        }
+      });
+    },
+    /**
+     * Takes external stylesheets loaded in an <element> element and moves
+     * their content into a <style> element inside the <element>'s template.
+     * The sheet is then removed from the <element>. This is done only so 
+     * that if the element is loaded in the main document, the sheet does
+     * not become active.
+     * Note, ignores sheets with the attribute 'polymer-scope'.
+     * @param elementElement The <element> element to style.
+     */
+    installLocalSheets: function () {
+      var sheets = this.sheets.filter(function(s) {
+        return !s.hasAttribute(SCOPE_ATTR);
+      });
+      var content = this.templateContent();
+      if (content) {
+        var cssText = '';
+        sheets.forEach(function(sheet) {
+          cssText += cssTextFromSheet(sheet) + '\n';
+        });
+        if (cssText) {
+          var style = createStyleElement(cssText, this.ownerDocument);
+          content.insertBefore(style, content.firstChild);
+        }
+      }
+    },
+    findNodes: function(selector, matcher) {
+      var nodes = this.querySelectorAll(selector).array();
+      var content = this.templateContent();
+      if (content) {
+        var templateNodes = content.querySelectorAll(selector).array();
+        nodes = nodes.concat(templateNodes);
+      }
+      return matcher ? nodes.filter(matcher) : nodes;
+    },
+    /**
+     * Promotes external stylesheets and <style> elements with the attribute 
+     * polymer-scope='global' into global scope.
+     * This is particularly useful for defining @keyframe rules which 
+     * currently do not function in scoped or shadow style elements.
+     * (See wkb.ug/72462)
+     * @param elementElement The <element> element to style.
+    */
+    // TODO(sorvell): remove when wkb.ug/72462 is addressed.
+    installGlobalStyles: function() {
+      var style = this.styleForScope(STYLE_GLOBAL_SCOPE);
+      applyStyleToScope(style, document.head);
+    },
+    cssTextForScope: function(scopeDescriptor) {
+      var cssText = '';
+      // handle stylesheets
+      var selector = '[' + SCOPE_ATTR + '=' + scopeDescriptor + ']';
+      var matcher = function(s) {
+        return matchesSelector(s, selector);
+      };
+      var sheets = this.sheets.filter(matcher);
+      sheets.forEach(function(sheet) {
+        cssText += cssTextFromSheet(sheet) + '\n\n';
+      });
+      // handle cached style elements
+      var styles = this.styles.filter(matcher);
+      styles.forEach(function(style) {
+        cssText += style.textContent + '\n\n';
+      });
+      return cssText;
+    },
+    styleForScope: function(scopeDescriptor) {
+      var cssText = this.cssTextForScope(scopeDescriptor);
+      return this.cssTextToScopeStyle(cssText, scopeDescriptor);
+    },
+    cssTextToScopeStyle: function(cssText, scopeDescriptor) {
+      if (cssText) {
+        var style = createStyleElement(cssText);
+        style.setAttribute(STYLE_SCOPE_ATTRIBUTE, this.getAttribute('name') +
+            '-' + scopeDescriptor);
+        return style;
+      }
+    }
+  };
+
+  function importRuleForSheet(sheet, baseUrl) {
+    var href = new URL(sheet.getAttribute('href'), baseUrl).href;
+    return '@import \'' + href + '\';';
+  }
+
+  function applyStyleToScope(style, scope) {
+    if (style) {
+      if (scope === document) {
+        scope = document.head;
+      }
+      if (hasShadowDOMPolyfill) {
+        scope = document.head;
+      }
+      // TODO(sorvell): necessary for IE
+      // see https://connect.microsoft.com/IE/feedback/details/790212/
+      // cloning-a-style-element-and-adding-to-document-produces
+      // -unexpected-result#details
+      // var clone = style.cloneNode(true);
+      var clone = createStyleElement(style.textContent);
+      var attr = style.getAttribute(STYLE_SCOPE_ATTRIBUTE);
+      if (attr) {
+        clone.setAttribute(STYLE_SCOPE_ATTRIBUTE, attr);
+      }
+      // TODO(sorvell): probably too brittle; try to figure out 
+      // where to put the element.
+      var refNode = scope.firstElementChild;
+      if (scope === document.head) {
+        var selector = 'style[' + STYLE_SCOPE_ATTRIBUTE + ']';
+        var s$ = document.head.querySelectorAll(selector);
+        if (s$.length) {
+          refNode = s$[s$.length-1].nextElementSibling;
+        }
+      }
+      scope.insertBefore(clone, refNode);
+    }
+  }
+
+  function createStyleElement(cssText, scope) {
+    scope = scope || document;
+    scope = scope.createElement ? scope : scope.ownerDocument;
+    var style = scope.createElement('style');
+    style.textContent = cssText;
+    return style;
+  }
+
+  function cssTextFromSheet(sheet) {
+    return (sheet && sheet.__resource) || '';
+  }
+
+  function matchesSelector(node, inSelector) {
+    if (matches) {
+      return matches.call(node, inSelector);
+    }
+  }
+  var p = HTMLElement.prototype;
+  var matches = p.matches || p.matchesSelector || p.webkitMatchesSelector 
+      || p.mozMatchesSelector;
+  
+  // exports
+
+  scope.api.declaration.styles = styles;
+  scope.applyStyleToScope = applyStyleToScope;
+  
+})(Polymer);
+
+(function(scope) {
+
+  // imports
+
+  var log = window.WebComponents ? WebComponents.flags.log : {};
+  var api = scope.api.instance.events;
+  var EVENT_PREFIX = api.EVENT_PREFIX;
+
+  var mixedCaseEventTypes = {};
+  [
+    'webkitAnimationStart',
+    'webkitAnimationEnd',
+    'webkitTransitionEnd',
+    'DOMFocusOut',
+    'DOMFocusIn',
+    'DOMMouseScroll'
+  ].forEach(function(e) {
+    mixedCaseEventTypes[e.toLowerCase()] = e;
+  });
+
+  // polymer-element declarative api: events feature
+  var events = {
+    parseHostEvents: function() {
+      // our delegates map
+      var delegates = this.prototype.eventDelegates;
+      // extract data from attributes into delegates
+      this.addAttributeDelegates(delegates);
+    },
+    addAttributeDelegates: function(delegates) {
+      // for each attribute
+      for (var i=0, a; a=this.attributes[i]; i++) {
+        // does it have magic marker identifying it as an event delegate?
+        if (this.hasEventPrefix(a.name)) {
+          // if so, add the info to delegates
+          delegates[this.removeEventPrefix(a.name)] = a.value.replace('{{', '')
+              .replace('}}', '').trim();
+        }
+      }
+    },
+    // starts with 'on-'
+    hasEventPrefix: function (n) {
+      return n && (n[0] === 'o') && (n[1] === 'n') && (n[2] === '-');
+    },
+    removeEventPrefix: function(n) {
+      return n.slice(prefixLength);
+    },
+    findController: function(node) {
+      while (node.parentNode) {
+        if (node.eventController) {
+          return node.eventController;
+        }
+        node = node.parentNode;
+      }
+      return node.host;
+    },
+    getEventHandler: function(controller, target, method) {
+      var events = this;
+      return function(e) {
+        if (!controller || !controller.PolymerBase) {
+          controller = events.findController(target);
+        }
+
+        var args = [e, e.detail, e.currentTarget];
+        controller.dispatchMethod(controller, method, args);
+      };
+    },
+    prepareEventBinding: function(pathString, name, node) {
+      if (!this.hasEventPrefix(name))
+        return;
+
+      var eventType = this.removeEventPrefix(name);
+      eventType = mixedCaseEventTypes[eventType] || eventType;
+
+      var events = this;
+
+      return function(model, node, oneTime) {
+        var handler = events.getEventHandler(undefined, node, pathString);
+        PolymerGestures.addEventListener(node, eventType, handler);
+
+        if (oneTime)
+          return;
+
+        // TODO(rafaelw): This is really pointless work. Aside from the cost
+        // of these allocations, NodeBind is going to setAttribute back to its
+        // current value. Fixing this would mean changing the TemplateBinding
+        // binding delegate API.
+        function bindingValue() {
+          return '{{ ' + pathString + ' }}';
+        }
+
+        return {
+          open: bindingValue,
+          discardChanges: bindingValue,
+          close: function() {
+            PolymerGestures.removeEventListener(node, eventType, handler);
+          }
+        };
+      };
+    }
+  };
+
+  var prefixLength = EVENT_PREFIX.length;
+
+  // exports
+  scope.api.declaration.events = events;
+
+})(Polymer);
+
+(function(scope) {
+
+  // element api
+
+  var observationBlacklist = ['attribute'];
+
+  var properties = {
+    inferObservers: function(prototype) {
+      // called before prototype.observe is chained to inherited object
+      var observe = prototype.observe, property;
+      for (var n in prototype) {
+        if (n.slice(-7) === 'Changed') {
+          property = n.slice(0, -7);
+          if (this.canObserveProperty(property)) {
+            if (!observe) {
+              observe  = (prototype.observe = {});
+            }
+            observe[property] = observe[property] || n;
+          }
+        }
+      }
+    },
+    canObserveProperty: function(property) {
+      return (observationBlacklist.indexOf(property) < 0);
+    },
+    explodeObservers: function(prototype) {
+      // called before prototype.observe is chained to inherited object
+      var o = prototype.observe;
+      if (o) {
+        var exploded = {};
+        for (var n in o) {
+          var names = n.split(' ');
+          for (var i=0, ni; ni=names[i]; i++) {
+            exploded[ni] = o[n];
+          }
+        }
+        prototype.observe = exploded;
+      }
+    },
+    optimizePropertyMaps: function(prototype) {
+      if (prototype.observe) {
+        // construct name list
+        var a = prototype._observeNames = [];
+        for (var n in prototype.observe) {
+          var names = n.split(' ');
+          for (var i=0, ni; ni=names[i]; i++) {
+            a.push(ni);
+          }
+        }
+      }
+      if (prototype.publish) {
+        // construct name list
+        var a = prototype._publishNames = [];
+        for (var n in prototype.publish) {
+          a.push(n);
+        }
+      }
+      if (prototype.computed) {
+        // construct name list
+        var a = prototype._computedNames = [];
+        for (var n in prototype.computed) {
+          a.push(n);
+        }
+      }
+    },
+    publishProperties: function(prototype, base) {
+      // if we have any properties to publish
+      var publish = prototype.publish;
+      if (publish) {
+        // transcribe `publish` entries onto own prototype
+        this.requireProperties(publish, prototype, base);
+        // warn and remove accessor names that are broken on some browsers
+        this.filterInvalidAccessorNames(publish);
+        // construct map of lower-cased property names
+        prototype._publishLC = this.lowerCaseMap(publish);
+      }
+      var computed = prototype.computed;
+      if (computed) {
+        // warn and remove accessor names that are broken on some browsers
+        this.filterInvalidAccessorNames(computed);
+      }
+    },
+    // Publishing/computing a property where the name might conflict with a
+    // browser property is not currently supported to help users of Polymer
+    // avoid browser bugs:
+    //
+    // https://code.google.com/p/chromium/issues/detail?id=43394
+    // https://bugs.webkit.org/show_bug.cgi?id=49739
+    //
+    // We can lift this restriction when those bugs are fixed.
+    filterInvalidAccessorNames: function(propertyNames) {
+      for (var name in propertyNames) {
+        // Check if the name is in our blacklist.
+        if (this.propertyNameBlacklist[name]) {
+          console.warn('Cannot define property "' + name + '" for element "' +
+            this.name + '" because it has the same name as an HTMLElement ' +
+            'property, and not all browsers support overriding that. ' +
+            'Consider giving it a different name.');
+          // Remove the invalid accessor from the list.
+          delete propertyNames[name];
+        }
+      }
+    },
+    //
+    // `name: value` entries in the `publish` object may need to generate 
+    // matching properties on the prototype.
+    //
+    // Values that are objects may have a `reflect` property, which
+    // signals that the value describes property control metadata.
+    // In metadata objects, the prototype default value (if any)
+    // is encoded in the `value` property.
+    //
+    // publish: {
+    //   foo: 5, 
+    //   bar: {value: true, reflect: true},
+    //   zot: {}
+    // }
+    //
+    // `reflect` metadata property controls whether changes to the property
+    // are reflected back to the attribute (default false). 
+    //
+    // A value is stored on the prototype unless it's === `undefined`,
+    // in which case the base chain is checked for a value.
+    // If the basal value is also undefined, `null` is stored on the prototype.
+    //
+    // The reflection data is stored on another prototype object, `reflect`
+    // which also can be specified directly.
+    //
+    // reflect: {
+    //   foo: true
+    // }
+    //
+    requireProperties: function(propertyInfos, prototype, base) {
+      // per-prototype storage for reflected properties
+      prototype.reflect = prototype.reflect || {};
+      // ensure a prototype value for each property
+      // and update the property's reflect to attribute status
+      for (var n in propertyInfos) {
+        var value = propertyInfos[n];
+        // value has metadata if it has a `reflect` property
+        if (value && value.reflect !== undefined) {
+          prototype.reflect[n] = Boolean(value.reflect);
+          value = value.value;
+        }
+        // only set a value if one is specified
+        if (value !== undefined) {
+          prototype[n] = value;
+        }
+      }
+    },
+    lowerCaseMap: function(properties) {
+      var map = {};
+      for (var n in properties) {
+        map[n.toLowerCase()] = n;
+      }
+      return map;
+    },
+    createPropertyAccessor: function(name, ignoreWrites) {
+      var proto = this.prototype;
+
+      var privateName = name + '_';
+      var privateObservable  = name + 'Observable_';
+      proto[privateName] = proto[name];
+
+      Object.defineProperty(proto, name, {
+        get: function() {
+          var observable = this[privateObservable];
+          if (observable)
+            observable.deliver();
+
+          return this[privateName];
+        },
+        set: function(value) {
+          if (ignoreWrites) {
+            return this[privateName];
+          }
+
+          var observable = this[privateObservable];
+          if (observable) {
+            observable.setValue(value);
+            return;
+          }
+
+          var oldValue = this[privateName];
+          this[privateName] = value;
+          this.emitPropertyChangeRecord(name, value, oldValue);
+
+          return value;
+        },
+        configurable: true
+      });
+    },
+    createPropertyAccessors: function(prototype) {
+      var n$ = prototype._computedNames;
+      if (n$ && n$.length) {
+        for (var i=0, l=n$.length, n, fn; (i<l) && (n=n$[i]); i++) {
+          this.createPropertyAccessor(n, true);
+        }
+      }
+      var n$ = prototype._publishNames;
+      if (n$ && n$.length) {
+        for (var i=0, l=n$.length, n, fn; (i<l) && (n=n$[i]); i++) {
+          // If the property is computed and published, the accessor is created
+          // above.
+          if (!prototype.computed || !prototype.computed[n]) {
+            this.createPropertyAccessor(n);
+          }
+        }
+      }
+    },
+    // This list contains some property names that people commonly want to use,
+    // but won't work because of Chrome/Safari bugs. It isn't an exhaustive
+    // list. In particular it doesn't contain any property names found on
+    // subtypes of HTMLElement (e.g. name, value). Rather it attempts to catch
+    // some common cases.
+    propertyNameBlacklist: {
+      children: 1,
+      'class': 1,
+      id: 1,
+      hidden: 1,
+      style: 1,
+      title: 1,
+    }
+  };
+
+  // exports
+
+  scope.api.declaration.properties = properties;
+
+})(Polymer);
+
+(function(scope) {
+
+  // magic words
+
+  var ATTRIBUTES_ATTRIBUTE = 'attributes';
+  var ATTRIBUTES_REGEX = /\s|,/;
+
+  // attributes api
+
+  var attributes = {
+    
+    inheritAttributesObjects: function(prototype) {
+      // chain our lower-cased publish map to the inherited version
+      this.inheritObject(prototype, 'publishLC');
+      // chain our instance attributes map to the inherited version
+      this.inheritObject(prototype, '_instanceAttributes');
+    },
+
+    publishAttributes: function(prototype, base) {
+      // merge names from 'attributes' attribute into the 'publish' object
+      var attributes = this.getAttribute(ATTRIBUTES_ATTRIBUTE);
+      if (attributes) {
+        // create a `publish` object if needed.
+        // the `publish` object is only relevant to this prototype, the 
+        // publishing logic in `declaration/properties.js` is responsible for
+        // managing property values on the prototype chain.
+        // TODO(sjmiles): the `publish` object is later chained to it's 
+        //                ancestor object, presumably this is only for 
+        //                reflection or other non-library uses. 
+        var publish = prototype.publish || (prototype.publish = {}); 
+        // names='a b c' or names='a,b,c'
+        var names = attributes.split(ATTRIBUTES_REGEX);
+        // record each name for publishing
+        for (var i=0, l=names.length, n; i<l; i++) {
+          // remove excess ws
+          n = names[i].trim();
+          // looks weird, but causes n to exist on `publish` if it does not;
+          // a more careful test would need expensive `in` operator
+          if (n && publish[n] === undefined) {
+            publish[n] = undefined;
+          }
+        }
+      }
+    },
+
+    // record clonable attributes from <element>
+    accumulateInstanceAttributes: function() {
+      // inherit instance attributes
+      var clonable = this.prototype._instanceAttributes;
+      // merge attributes from element
+      var a$ = this.attributes;
+      for (var i=0, l=a$.length, a; (i<l) && (a=a$[i]); i++) {  
+        if (this.isInstanceAttribute(a.name)) {
+          clonable[a.name] = a.value;
+        }
+      }
+    },
+
+    isInstanceAttribute: function(name) {
+      return !this.blackList[name] && name.slice(0,3) !== 'on-';
+    },
+
+    // do not clone these attributes onto instances
+    blackList: {
+      name: 1,
+      'extends': 1,
+      constructor: 1,
+      noscript: 1,
+      assetpath: 1,
+      'cache-csstext': 1
+    }
+    
+  };
+
+  // add ATTRIBUTES_ATTRIBUTE to the blacklist
+  attributes.blackList[ATTRIBUTES_ATTRIBUTE] = 1;
+
+  // exports
+
+  scope.api.declaration.attributes = attributes;
+
+})(Polymer);
+
+(function(scope) {
+
+  // imports
+  var events = scope.api.declaration.events;
+
+  var syntax = new PolymerExpressions();
+  var prepareBinding = syntax.prepareBinding;
+
+  // Polymer takes a first crack at the binding to see if it's a declarative
+  // event handler.
+  syntax.prepareBinding = function(pathString, name, node) {
+    return events.prepareEventBinding(pathString, name, node) ||
+           prepareBinding.call(syntax, pathString, name, node);
+  };
+
+  // declaration api supporting mdv
+  var mdv = {
+    syntax: syntax,
+    fetchTemplate: function() {
+      return this.querySelector('template');
+    },
+    templateContent: function() {
+      var template = this.fetchTemplate();
+      return template && template.content;
+    },
+    installBindingDelegate: function(template) {
+      if (template) {
+        template.bindingDelegate = this.syntax;
+      }
+    }
+  };
+
+  // exports
+  scope.api.declaration.mdv = mdv;
+
+})(Polymer);
+
+(function(scope) {
+
+  // imports
+  
+  var api = scope.api;
+  var isBase = scope.isBase;
+  var extend = scope.extend;
+
+  var hasShadowDOMPolyfill = window.ShadowDOMPolyfill;
+
+  // prototype api
+
+  var prototype = {
+
+    register: function(name, extendeeName) {
+      // build prototype combining extendee, Polymer base, and named api
+      this.buildPrototype(name, extendeeName);
+      // register our custom element with the platform
+      this.registerPrototype(name, extendeeName);
+      // reference constructor in a global named by 'constructor' attribute
+      this.publishConstructor();
+    },
+
+    buildPrototype: function(name, extendeeName) {
+      // get our custom prototype (before chaining)
+      var extension = scope.getRegisteredPrototype(name);
+      // get basal prototype
+      var base = this.generateBasePrototype(extendeeName);
+      // implement declarative features
+      this.desugarBeforeChaining(extension, base);
+      // join prototypes
+      this.prototype = this.chainPrototypes(extension, base);
+      // more declarative features
+      this.desugarAfterChaining(name, extendeeName);
+    },
+
+    desugarBeforeChaining: function(prototype, base) {
+      // back reference declaration element
+      // TODO(sjmiles): replace `element` with `elementElement` or `declaration`
+      prototype.element = this;
+      // transcribe `attributes` declarations onto own prototype's `publish`
+      this.publishAttributes(prototype, base);
+      // `publish` properties to the prototype and to attribute watch
+      this.publishProperties(prototype, base);
+      // infer observers for `observe` list based on method names
+      this.inferObservers(prototype);
+      // desugar compound observer syntax, e.g. 'a b c' 
+      this.explodeObservers(prototype);
+    },
+
+    chainPrototypes: function(prototype, base) {
+      // chain various meta-data objects to inherited versions
+      this.inheritMetaData(prototype, base);
+      // chain custom api to inherited
+      var chained = this.chainObject(prototype, base);
+      // x-platform fixup
+      ensurePrototypeTraversal(chained);
+      return chained;
+    },
+
+    inheritMetaData: function(prototype, base) {
+      // chain observe object to inherited
+      this.inheritObject('observe', prototype, base);
+      // chain publish object to inherited
+      this.inheritObject('publish', prototype, base);
+      // chain reflect object to inherited
+      this.inheritObject('reflect', prototype, base);
+      // chain our lower-cased publish map to the inherited version
+      this.inheritObject('_publishLC', prototype, base);
+      // chain our instance attributes map to the inherited version
+      this.inheritObject('_instanceAttributes', prototype, base);
+      // chain our event delegates map to the inherited version
+      this.inheritObject('eventDelegates', prototype, base);
+    },
+
+    // implement various declarative features
+    desugarAfterChaining: function(name, extendee) {
+      // build side-chained lists to optimize iterations
+      this.optimizePropertyMaps(this.prototype);
+      this.createPropertyAccessors(this.prototype);
+      // install mdv delegate on template
+      this.installBindingDelegate(this.fetchTemplate());
+      // install external stylesheets as if they are inline
+      this.installSheets();
+      // adjust any paths in dom from imports
+      this.resolveElementPaths(this);
+      // compile list of attributes to copy to instances
+      this.accumulateInstanceAttributes();
+      // parse on-* delegates declared on `this` element
+      this.parseHostEvents();
+      //
+      // install a helper method this.resolvePath to aid in 
+      // setting resource urls. e.g.
+      // this.$.image.src = this.resolvePath('images/foo.png')
+      this.addResolvePathApi();
+      // under ShadowDOMPolyfill, transforms to approximate missing CSS features
+      if (hasShadowDOMPolyfill) {
+        WebComponents.ShadowCSS.shimStyling(this.templateContent(), name,
+          extendee);
+      }
+      // allow custom element access to the declarative context
+      if (this.prototype.registerCallback) {
+        this.prototype.registerCallback(this);
+      }
+    },
+
+    // if a named constructor is requested in element, map a reference
+    // to the constructor to the given symbol
+    publishConstructor: function() {
+      var symbol = this.getAttribute('constructor');
+      if (symbol) {
+        window[symbol] = this.ctor;
+      }
+    },
+
+    // build prototype combining extendee, Polymer base, and named api
+    generateBasePrototype: function(extnds) {
+      var prototype = this.findBasePrototype(extnds);
+      if (!prototype) {
+        // create a prototype based on tag-name extension
+        var prototype = HTMLElement.getPrototypeForTag(extnds);
+        // insert base api in inheritance chain (if needed)
+        prototype = this.ensureBaseApi(prototype);
+        // memoize this base
+        memoizedBases[extnds] = prototype;
+      }
+      return prototype;
+    },
+
+    findBasePrototype: function(name) {
+      return memoizedBases[name];
+    },
+
+    // install Polymer instance api into prototype chain, as needed 
+    ensureBaseApi: function(prototype) {
+      if (prototype.PolymerBase) {
+        return prototype;
+      }
+      var extended = Object.create(prototype);
+      // we need a unique copy of base api for each base prototype
+      // therefore we 'extend' here instead of simply chaining
+      api.publish(api.instance, extended);
+      // TODO(sjmiles): sharing methods across prototype chains is
+      // not supported by 'super' implementation which optimizes
+      // by memoizing prototype relationships.
+      // Probably we should have a version of 'extend' that is 
+      // share-aware: it could study the text of each function,
+      // look for usage of 'super', and wrap those functions in
+      // closures.
+      // As of now, there is only one problematic method, so 
+      // we just patch it manually.
+      // To avoid re-entrancy problems, the special super method
+      // installed is called `mixinSuper` and the mixin method
+      // must use this method instead of the default `super`.
+      this.mixinMethod(extended, prototype, api.instance.mdv, 'bind');
+      // return buffed-up prototype
+      return extended;
+    },
+
+    mixinMethod: function(extended, prototype, api, name) {
+      var $super = function(args) {
+        return prototype[name].apply(this, args);
+      };
+      extended[name] = function() {
+        this.mixinSuper = $super;
+        return api[name].apply(this, arguments);
+      }
+    },
+
+    // ensure prototype[name] inherits from a prototype.prototype[name]
+    inheritObject: function(name, prototype, base) {
+      // require an object
+      var source = prototype[name] || {};
+      // chain inherited properties onto a new object
+      prototype[name] = this.chainObject(source, base[name]);
+    },
+
+    // register 'prototype' to custom element 'name', store constructor 
+    registerPrototype: function(name, extendee) { 
+      var info = {
+        prototype: this.prototype
+      }
+      // native element must be specified in extends
+      var typeExtension = this.findTypeExtension(extendee);
+      if (typeExtension) {
+        info.extends = typeExtension;
+      }
+      // register the prototype with HTMLElement for name lookup
+      HTMLElement.register(name, this.prototype);
+      // register the custom type
+      this.ctor = document.registerElement(name, info);
+    },
+
+    findTypeExtension: function(name) {
+      if (name && name.indexOf('-') < 0) {
+        return name;
+      } else {
+        var p = this.findBasePrototype(name);
+        if (p.element) {
+          return this.findTypeExtension(p.element.extends);
+        }
+      }
+    }
+
+  };
+
+  // memoize base prototypes
+  var memoizedBases = {};
+
+  // implementation of 'chainObject' depends on support for __proto__
+  if (Object.__proto__) {
+    prototype.chainObject = function(object, inherited) {
+      if (object && inherited && object !== inherited) {
+        object.__proto__ = inherited;
+      }
+      return object;
+    }
+  } else {
+    prototype.chainObject = function(object, inherited) {
+      if (object && inherited && object !== inherited) {
+        var chained = Object.create(inherited);
+        object = extend(chained, object);
+      }
+      return object;
+    }
+  }
+
+  // On platforms that do not support __proto__ (versions of IE), the prototype
+  // chain of a custom element is simulated via installation of __proto__.
+  // Although custom elements manages this, we install it here so it's
+  // available during desugaring.
+  function ensurePrototypeTraversal(prototype) {
+    if (!Object.__proto__) {
+      var ancestor = Object.getPrototypeOf(prototype);
+      prototype.__proto__ = ancestor;
+      if (isBase(ancestor)) {
+        ancestor.__proto__ = Object.getPrototypeOf(ancestor);
+      }
+    }
+  }
+
+  // exports
+
+  api.declaration.prototype = prototype;
+
+})(Polymer);
+
+(function(scope) {
+
+  /*
+
+    Elements are added to a registration queue so that they register in 
+    the proper order at the appropriate time. We do this for a few reasons:
+
+    * to enable elements to load resources (like stylesheets) 
+    asynchronously. We need to do this until the platform provides an efficient
+    alternative. One issue is that remote @import stylesheets are 
+    re-fetched whenever stamped into a shadowRoot.
+
+    * to ensure elements loaded 'at the same time' (e.g. via some set of
+    imports) are registered as a batch. This allows elements to be enured from
+    upgrade ordering as long as they query the dom tree 1 task after
+    upgrade (aka domReady). This is a performance tradeoff. On the one hand,
+    elements that could register while imports are loading are prevented from 
+    doing so. On the other, grouping upgrades into a single task means less
+    incremental work (for example style recalcs),  Also, we can ensure the 
+    document is in a known state at the single quantum of time when 
+    elements upgrade.
+
+  */
+  var queue = {
+
+    // tell the queue to wait for an element to be ready
+    wait: function(element) {
+      if (!element.__queue) {
+        element.__queue = {};
+        elements.push(element);
+      }
+    },
+
+    // enqueue an element to the next spot in the queue.
+    enqueue: function(element, check, go) {
+      var shouldAdd = element.__queue && !element.__queue.check;
+      if (shouldAdd) {
+        queueForElement(element).push(element);
+        element.__queue.check = check;
+        element.__queue.go = go;
+      }
+      return (this.indexOf(element) !== 0);
+    },
+
+    indexOf: function(element) {
+      var i = queueForElement(element).indexOf(element);
+      if (i >= 0 && document.contains(element)) {
+        i += (HTMLImports.useNative || HTMLImports.ready) ? 
+          importQueue.length : 1e9;
+      }
+      return i;  
+    },
+
+    // tell the queue an element is ready to be registered
+    go: function(element) {
+      var readied = this.remove(element);
+      if (readied) {
+        element.__queue.flushable = true;
+        this.addToFlushQueue(readied);
+        this.check();
+      }
+    },
+
+    remove: function(element) {
+      var i = this.indexOf(element);
+      if (i !== 0) {
+        //console.warn('queue order wrong', i);
+        return;
+      }
+      return queueForElement(element).shift();
+    },
+
+    check: function() {
+      // next
+      var element = this.nextElement();
+      if (element) {
+        element.__queue.check.call(element);
+      }
+      if (this.canReady()) {
+        this.ready();
+        return true;
+      }
+    },
+
+    nextElement: function() {
+      return nextQueued();
+    },
+
+    canReady: function() {
+      return !this.waitToReady && this.isEmpty();
+    },
+
+    isEmpty: function() {
+      for (var i=0, l=elements.length, e; (i<l) && 
+          (e=elements[i]); i++) {
+        if (e.__queue && !e.__queue.flushable) {
+          return;
+        }
+      }
+      return true;
+    },
+
+    addToFlushQueue: function(element) {
+      flushQueue.push(element);  
+    },
+
+    flush: function() {
+      // prevent re-entrance
+      if (this.flushing) {
+        return;
+      }
+      this.flushing = true;
+      var element;
+      while (flushQueue.length) {
+        element = flushQueue.shift();
+        element.__queue.go.call(element);
+        element.__queue = null;
+      }
+      this.flushing = false;
+    },
+
+    ready: function() {
+      // TODO(sorvell): As an optimization, turn off CE polyfill upgrading
+      // while registering. This way we avoid having to upgrade each document
+      // piecemeal per registration and can instead register all elements
+      // and upgrade once in a batch. Without this optimization, upgrade time
+      // degrades significantly when SD polyfill is used. This is mainly because
+      // querying the document tree for elements is slow under the SD polyfill.
+      var polyfillWasReady = CustomElements.ready;
+      CustomElements.ready = false;
+      this.flush();
+      if (!CustomElements.useNative) {
+        CustomElements.upgradeDocumentTree(document);
+      }
+      CustomElements.ready = polyfillWasReady;
+      Polymer.flush();
+      requestAnimationFrame(this.flushReadyCallbacks);
+    },
+
+    addReadyCallback: function(callback) {
+      if (callback) {
+        readyCallbacks.push(callback);
+      }
+    },
+
+    flushReadyCallbacks: function() {
+      if (readyCallbacks) {
+        var fn;
+        while (readyCallbacks.length) {
+          fn = readyCallbacks.shift();
+          fn();
+        }
+      }
+    },
+  
+    /**
+    Returns a list of elements that have had polymer-elements created but 
+    are not yet ready to register. The list is an array of element definitions.
+    */
+    waitingFor: function() {
+      var e$ = [];
+      for (var i=0, l=elements.length, e; (i<l) && 
+          (e=elements[i]); i++) {
+        if (e.__queue && !e.__queue.flushable) {
+          e$.push(e);
+        }
+      }
+      return e$;
+    },
+
+    waitToReady: true
+
+  };
+
+  var elements = [];
+  var flushQueue = [];
+  var importQueue = [];
+  var mainQueue = [];
+  var readyCallbacks = [];
+
+  function queueForElement(element) {
+    return document.contains(element) ? mainQueue : importQueue;
+  }
+
+  function nextQueued() {
+    return importQueue.length ? importQueue[0] : mainQueue[0];
+  }
+
+  function whenReady(callback) {
+    queue.waitToReady = true;
+    Polymer.endOfMicrotask(function() {
+      HTMLImports.whenReady(function() {
+        queue.addReadyCallback(callback);
+        queue.waitToReady = false;
+        queue.check();
+    });
+    });
+  }
+
+  /**
+    Forces polymer to register any pending elements. Can be used to abort
+    waiting for elements that are partially defined.
+    @param timeout {Integer} Optional timeout in milliseconds
+  */
+  function forceReady(timeout) {
+    if (timeout === undefined) {
+      queue.ready();
+      return;
+    }
+    var handle = setTimeout(function() {
+      queue.ready();
+    }, timeout);
+    Polymer.whenReady(function() {
+      clearTimeout(handle);
+    });
+  }
+
+  // exports
+  scope.elements = elements;
+  scope.waitingFor = queue.waitingFor.bind(queue);
+  scope.forceReady = forceReady;
+  scope.queue = queue;
+  scope.whenReady = scope.whenPolymerReady = whenReady;
+})(Polymer);
+
+(function(scope) {
+
+  // imports
+
+  var extend = scope.extend;
+  var api = scope.api;
+  var queue = scope.queue;
+  var whenReady = scope.whenReady;
+  var getRegisteredPrototype = scope.getRegisteredPrototype;
+  var waitingForPrototype = scope.waitingForPrototype;
+
+  // declarative implementation: <polymer-element>
+
+  var prototype = extend(Object.create(HTMLElement.prototype), {
+
+    createdCallback: function() {
+      if (this.getAttribute('name')) {
+        this.init();
+      }
+    },
+
+    init: function() {
+      // fetch declared values
+      this.name = this.getAttribute('name');
+      this.extends = this.getAttribute('extends');
+      queue.wait(this);
+      // initiate any async resource fetches
+      this.loadResources();
+      // register when all constraints are met
+      this.registerWhenReady();
+    },
+
+    // TODO(sorvell): we currently queue in the order the prototypes are 
+    // registered, but we should queue in the order that polymer-elements
+    // are registered. We are currently blocked from doing this based on 
+    // crbug.com/395686.
+    registerWhenReady: function() {
+     if (this.registered
+       || this.waitingForPrototype(this.name)
+       || this.waitingForQueue()
+       || this.waitingForResources()) {
+          return;
+      }
+      queue.go(this);
+    },
+
+    _register: function() {
+      //console.log('registering', this.name);
+      // warn if extending from a custom element not registered via Polymer
+      if (isCustomTag(this.extends) && !isRegistered(this.extends)) {
+        console.warn('%s is attempting to extend %s, an unregistered element ' +
+            'or one that was not registered with Polymer.', this.name,
+            this.extends);
+      }
+      this.register(this.name, this.extends);
+      this.registered = true;
+    },
+
+    waitingForPrototype: function(name) {
+      if (!getRegisteredPrototype(name)) {
+        // then wait for a prototype
+        waitingForPrototype(name, this);
+        // emulate script if user is not supplying one
+        this.handleNoScript(name);
+        // prototype not ready yet
+        return true;
+      }
+    },
+
+    handleNoScript: function(name) {
+      // if explicitly marked as 'noscript'
+      if (this.hasAttribute('noscript') && !this.noscript) {
+        this.noscript = true;
+        // imperative element registration
+        Polymer(name);
+      }
+    },
+
+    waitingForResources: function() {
+      return this._needsResources;
+    },
+
+    // NOTE: Elements must be queued in proper order for inheritance/composition
+    // dependency resolution. Previously this was enforced for inheritance,
+    // and by rule for composition. It's now entirely by rule.
+    waitingForQueue: function() {
+      return queue.enqueue(this, this.registerWhenReady, this._register);
+    },
+
+    loadResources: function() {
+      this._needsResources = true;
+      this.loadStyles(function() {
+        this._needsResources = false;
+        this.registerWhenReady();
+      }.bind(this));
+    }
+
+  });
+
+  // semi-pluggable APIs 
+
+  // TODO(sjmiles): should be fully pluggable (aka decoupled, currently
+  // the various plugins are allowed to depend on each other directly)
+  api.publish(api.declaration, prototype);
+
+  // utility and bookkeeping
+
+  function isRegistered(name) {
+    return Boolean(HTMLElement.getPrototypeForTag(name));
+  }
+
+  function isCustomTag(name) {
+    return (name && name.indexOf('-') >= 0);
+  }
+
+  // boot tasks
+
+  whenReady(function() {
+    document.body.removeAttribute('unresolved');
+    document.dispatchEvent(
+      new CustomEvent('polymer-ready', {bubbles: true})
+    );
+  });
+
+  // register polymer-element with document
+
+  document.registerElement('polymer-element', {prototype: prototype});
+
+})(Polymer);
+
+(function(scope) {
+
+/**
+ * @class Polymer
+ */
+
+var whenReady = scope.whenReady;
+
+/**
+ * Loads the set of HTMLImports contained in `node`. Notifies when all
+ * the imports have loaded by calling the `callback` function argument.
+ * This method can be used to lazily load imports. For example, given a 
+ * template:
+ *     
+ *     <template>
+ *       <link rel="import" href="my-import1.html">
+ *       <link rel="import" href="my-import2.html">
+ *     </template>
+ *
+ *     Polymer.importElements(template.content, function() {
+ *       console.log('imports lazily loaded'); 
+ *     });
+ * 
+ * @method importElements
+ * @param {Node} node Node containing the HTMLImports to load.
+ * @param {Function} callback Callback called when all imports have loaded.
+ */
+function importElements(node, callback) {
+  if (node) {
+    document.head.appendChild(node);
+    whenReady(callback);
+  } else if (callback) {
+    callback();
+  }
+}
+
+/**
+ * Loads an HTMLImport for each url specified in the `urls` array.
+ * Notifies when all the imports have loaded by calling the `callback` 
+ * function argument. This method can be used to lazily load imports. 
+ * For example,
+ *
+ *     Polymer.import(['my-import1.html', 'my-import2.html'], function() {
+ *       console.log('imports lazily loaded'); 
+ *     });
+ * 
+ * @method import
+ * @param {Array} urls Array of urls to load as HTMLImports.
+ * @param {Function} callback Callback called when all imports have loaded.
+ */
+function _import(urls, callback) {
+  if (urls && urls.length) {
+      var frag = document.createDocumentFragment();
+      for (var i=0, l=urls.length, url, link; (i<l) && (url=urls[i]); i++) {
+        link = document.createElement('link');
+        link.rel = 'import';
+        link.href = url;
+        frag.appendChild(link);
+      }
+      importElements(frag, callback);
+  } else if (callback) {
+    callback();
+  }
+}
+
+// exports
+scope.import = _import;
+scope.importElements = importElements;
+
+})(Polymer);
+
+/**
+ * The `auto-binding` element extends the template element. It provides a quick 
+ * and easy way to do data binding without the need to setup a model. 
+ * The `auto-binding` element itself serves as the model and controller for the 
+ * elements it contains. Both data and event handlers can be bound. 
+ *
+ * The `auto-binding` element acts just like a template that is bound to 
+ * a model. It stamps its content in the dom adjacent to itself. When the 
+ * content is stamped, the `template-bound` event is fired.
+ *
+ * Example:
+ *
+ *     <template is="auto-binding">
+ *       <div>Say something: <input value="{{value}}"></div>
+ *       <div>You said: {{value}}</div>
+ *       <button on-tap="{{buttonTap}}">Tap me!</button>
+ *     </template>
+ *     <script>
+ *       var template = document.querySelector('template');
+ *       template.value = 'something';
+ *       template.buttonTap = function() {
+ *         console.log('tap!');
+ *       };
+ *     </script>
+ *
+ * @module Polymer
+ * @status stable
+*/
+
+(function() {
+
+  var element = document.createElement('polymer-element');
+  element.setAttribute('name', 'auto-binding');
+  element.setAttribute('extends', 'template');
+  element.init();
+
+  Polymer('auto-binding', {
+
+    createdCallback: function() {
+      this.syntax = this.bindingDelegate = this.makeSyntax();
+      // delay stamping until polymer-ready so that auto-binding is not
+      // required to load last.
+      Polymer.whenPolymerReady(function() {
+        this.model = this;
+        this.setAttribute('bind', '');
+        // we don't bother with an explicit signal here, we could ust a MO
+        // if necessary
+        this.async(function() {
+          // note: this will marshall *all* the elements in the parentNode
+          // rather than just stamped ones. We'd need to use createInstance
+          // to fix this or something else fancier.
+          this.marshalNodeReferences(this.parentNode);
+          // template stamping is asynchronous so stamping isn't complete
+          // by polymer-ready; fire an event so users can use stamped elements
+          this.fire('template-bound');
+        });
+      }.bind(this));
+    },
+
+    makeSyntax: function() {
+      var events = Object.create(Polymer.api.declaration.events);
+      var self = this;
+      events.findController = function() { return self.model; };
+
+      var syntax = new PolymerExpressions();
+      var prepareBinding = syntax.prepareBinding;  
+      syntax.prepareBinding = function(pathString, name, node) {
+        return events.prepareEventBinding(pathString, name, node) ||
+               prepareBinding.call(syntax, pathString, name, node);
+      };
+      return syntax;
+    }
+
+  });
+
+})();