Updating the samples page to reflect the examples that have been retired.

src/site/samples/tracker/example/packages/web_components/platform.concat.js

-/**
- * 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
- */
-
-window.Platform = window.Platform || {};
-// prepopulate window.logFlags if necessary
-window.logFlags = window.logFlags || {};
-// process flags
-(function(scope){
-  // import
-  var flags = scope.flags || {};
-  // populate flags from location
-  location.search.slice(1).split('&').forEach(function(o) {
-    o = o.split('=');
-    o[0] && (flags[o[0]] = o[1] || true);
-  });
-  var entryPoint = document.currentScript ||
-      document.querySelector('script[src*="platform.js"]');
-  if (entryPoint) {
-    var a = entryPoint.attributes;
-    for (var i = 0, n; i < a.length; i++) {
-      n = a[i];
-      if (n.name !== 'src') {
-        flags[n.name] = n.value || true;
-      }
-    }
-  }
-  if (flags.log) {
-    flags.log.split(',').forEach(function(f) {
-      window.logFlags[f] = true;
-    });
-  }
-  // If any of these flags match 'native', then force native ShadowDOM; any
-  // other truthy value, or failure to detect native
-  // ShadowDOM, results in polyfill
-  flags.shadow = flags.shadow || flags.shadowdom || flags.polyfill;
-  if (flags.shadow === 'native') {
-    flags.shadow = false;
-  } else {
-    flags.shadow = flags.shadow || !HTMLElement.prototype.createShadowRoot;
-  }
-
-  if (flags.shadow && document.querySelectorAll('script').length > 1) {
-    console.log('Warning: platform.js is not the first script on the page. ' +
-        'See http://www.polymer-project.org/docs/start/platform.html#setup ' +
-        'for details.');
-  }
-
-  // CustomElements polyfill flag
-  if (flags.register) {
-    window.CustomElements = window.CustomElements || {flags: {}};
-    window.CustomElements.flags.register = flags.register;
-  }
-
-  if (flags.imports) {
-    window.HTMLImports = window.HTMLImports || {flags: {}};
-    window.HTMLImports.flags.imports = flags.imports;
-  }
-
-  // export
-  scope.flags = flags;
-})(Platform);
-
-/*
- * Copyright 2012 The Polymer Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
-if (typeof WeakMap === 'undefined') {
-  (function() {
-    var defineProperty = Object.defineProperty;
-    var counter = Date.now() % 1e9;
-
-    var WeakMap = function() {
-      this.name = '__st' + (Math.random() * 1e9 >>> 0) + (counter++ + '__');
-    };
-
-    WeakMap.prototype = {
-      set: function(key, value) {
-        var entry = key[this.name];
-        if (entry && entry[0] === key)
-          entry[1] = value;
-        else
-          defineProperty(key, this.name, {value: [key, value], writable: true});
-        return this;
-      },
-      get: function(key) {
-        var entry;
-        return (entry = key[this.name]) && entry[0] === key ?
-            entry[1] : undefined;
-      },
-      delete: function(key) {
-        var entry = key[this.name];
-        if (!entry) return false;
-        var hasValue = entry[0] === key;
-        entry[0] = entry[1] = undefined;
-        return hasValue;
-      },
-      has: function(key) {
-        var entry = key[this.name];
-        if (!entry) return false;
-        return entry[0] === key;
-      }
-    };
-
-    window.WeakMap = WeakMap;
-  })();
-}
-
-// select ShadowDOM impl
-if (Platform.flags.shadow) {
-
-/*
- * 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 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[0]);
-      }
-    },
-
-    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(){
-    var eomObj = { pingPong: true };
-    var eomRunScheduled = false;
-
-    Object.observe(eomObj, function() {
-      runEOMTasks();
-      eomRunScheduled = false;
-    });
-
-    return function(fn) {
-      eomTasks.push(fn);
-      if (!eomRunScheduled) {
-        eomRunScheduled = true;
-        eomObj.pingPong = !eomObj.pingPong;
-      }
-    };
-  })() :
-  (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 = {
-      object: undefined,
-      objects: objects,
-      open: function(obs, object) {
-        if (!rootObj) {
-          rootObj = object;
-          rootObjProps = {};
-        }
-
-        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);
-      }
-    };
-
-    return record;
-  }
-
-  var lastObservedSet;
-
-  function getObservedSet(observer, obj) {
-    if (!lastObservedSet || lastObservedSet.object !== obj) {
-      lastObservedSet = observedSetCache.pop() || newObservedSet();
-      lastObservedSet.object = 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;
-  }
-
-  global.Observer = Observer;
-  global.Observer.runEOM_ = runEOM;
-  global.Observer.observerSentinel_ = observerSentinel; // for testing.
-  global.Observer.hasObjectObserve = hasObserve;
-  global.ArrayObserver = ArrayObserver;
-  global.ArrayObserver.calculateSplices = function(current, previous) {
-    return arraySplice.calculateSplices(current, previous);
-  };
-
-  global.ArraySplice = ArraySplice;
-  global.ObjectObserver = ObjectObserver;
-  global.PathObserver = PathObserver;
-  global.CompoundObserver = CompoundObserver;
-  global.Path = Path;
-  global.ObserverTransform = ObserverTransform;
-})(typeof global !== 'undefined' && global && typeof module !== 'undefined' && module ? global : this || window);
-
-// Copyright 2012 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-window.ShadowDOMPolyfill = {};
-
-(function(scope) {
-  'use strict';
-
-  var constructorTable = new WeakMap();
-  var nativePrototypeTable = new WeakMap();
-  var wrappers = Object.create(null);
-
-  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 (navigator.getDeviceStorage) {
-      return false;
-    }
-
-    try {
-      var f = new Function('return true;');
-      return f();
-    } catch (ex) {
-      return false;
-    }
-  }
-
-  var hasEval = detectEval();
-
-  function assert(b) {
-    if (!b)
-      throw new Error('Assertion failed');
-  };
-
-  var defineProperty = Object.defineProperty;
-  var getOwnPropertyNames = Object.getOwnPropertyNames;
-  var getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
-
-  function mixin(to, from) {
-    var names = getOwnPropertyNames(from);
-    for (var i = 0; i < names.length; i++) {
-      var name = names[i];
-      defineProperty(to, name, getOwnPropertyDescriptor(from, name));
-    }
-    return to;
-  };
-
-  function mixinStatics(to, from) {
-    var names = getOwnPropertyNames(from);
-    for (var i = 0; i < names.length; i++) {
-      var name = names[i];
-      switch (name) {
-        case 'arguments':
-        case 'caller':
-        case 'length':
-        case 'name':
-        case 'prototype':
-        case 'toString':
-          continue;
-      }
-      defineProperty(to, name, getOwnPropertyDescriptor(from, name));
-    }
-    return to;
-  };
-
-  function oneOf(object, propertyNames) {
-    for (var i = 0; i < propertyNames.length; i++) {
-      if (propertyNames[i] in object)
-        return propertyNames[i];
-    }
-  }
-
-  var nonEnumerableDataDescriptor = {
-    value: undefined,
-    configurable: true,
-    enumerable: false,
-    writable: true
-  };
-
-  function defineNonEnumerableDataProperty(object, name, value) {
-    nonEnumerableDataDescriptor.value = value;
-    defineProperty(object, name, nonEnumerableDataDescriptor);
-  }
-
-  // Mozilla's old DOM bindings are bretty busted:
-  // https://bugzilla.mozilla.org/show_bug.cgi?id=855844
-  // Make sure they are create before we start modifying things.
-  getOwnPropertyNames(window);
-
-  function getWrapperConstructor(node) {
-    var nativePrototype = node.__proto__ || Object.getPrototypeOf(node);
-    var wrapperConstructor = constructorTable.get(nativePrototype);
-    if (wrapperConstructor)
-      return wrapperConstructor;
-
-    var parentWrapperConstructor = getWrapperConstructor(nativePrototype);
-
-    var GeneratedWrapper = createWrapperConstructor(parentWrapperConstructor);
-    registerInternal(nativePrototype, GeneratedWrapper, node);
-
-    return GeneratedWrapper;
-  }
-
-  function addForwardingProperties(nativePrototype, wrapperPrototype) {
-    installProperty(nativePrototype, wrapperPrototype, true);
-  }
-
-  function registerInstanceProperties(wrapperPrototype, instanceObject) {
-    installProperty(instanceObject, wrapperPrototype, false);
-  }
-
-  var isFirefox = /Firefox/.test(navigator.userAgent);
-
-  // This is used as a fallback when getting the descriptor fails in
-  // installProperty.
-  var dummyDescriptor = {
-    get: function() {},
-    set: function(v) {},
-    configurable: true,
-    enumerable: true
-  };
-
-  function isEventHandlerName(name) {
-    return /^on[a-z]+$/.test(name);
-  }
-
-  function isIdentifierName(name) {
-    return /^\w[a-zA-Z_0-9]*$/.test(name);
-  }
-
-  // The name of the implementation property is intentionally hard to
-  // remember. Unfortunately, browsers are slower doing obj[expr] than
-  // obj.foo so we resort to repeat this ugly name. This ugly name is never
-  // used outside of this file though.
-
-  function getGetter(name) {
-    return hasEval && isIdentifierName(name) ?
-        new Function('return this.__impl4cf1e782hg__.' + name) :
-        function() { return this.__impl4cf1e782hg__[name]; };
-  }
-
-  function getSetter(name) {
-    return hasEval && isIdentifierName(name) ?
-        new Function('v', 'this.__impl4cf1e782hg__.' + name + ' = v') :
-        function(v) { this.__impl4cf1e782hg__[name] = v; };
-  }
-
-  function getMethod(name) {
-    return hasEval && isIdentifierName(name) ?
-        new Function('return this.__impl4cf1e782hg__.' + name +
-                     '.apply(this.__impl4cf1e782hg__, arguments)') :
-        function() {
-          return this.__impl4cf1e782hg__[name].apply(
-              this.__impl4cf1e782hg__, arguments);
-        };
-  }
-
-  function getDescriptor(source, name) {
-    try {
-      return Object.getOwnPropertyDescriptor(source, name);
-    } catch (ex) {
-      // JSC and V8 both use data properties instead of accessors which can
-      // cause getting the property desciptor to throw an exception.
-      // https://bugs.webkit.org/show_bug.cgi?id=49739
-      return dummyDescriptor;
-    }
-  }
-
-  // Safari 8 exposes WebIDL attributes as an invalid accessor property. Its
-  // descriptor has {get: undefined, set: undefined}. We therefore ignore the
-  // shape of the descriptor and make all properties read-write.
-  // https://bugs.webkit.org/show_bug.cgi?id=49739
-  var isBrokenSafari = function() {
-    var descr = Object.getOwnPropertyDescriptor(Node.prototype, 'nodeType');
-    return !!descr && 'set' in descr;
-  }();
-
-  function installProperty(source, target, allowMethod, opt_blacklist) {
-    var names = getOwnPropertyNames(source);
-    for (var i = 0; i < names.length; i++) {
-      var name = names[i];
-      if (name === 'polymerBlackList_')
-        continue;
-
-      if (name in target)
-        continue;
-
-      if (source.polymerBlackList_ && source.polymerBlackList_[name])
-        continue;
-
-      if (isFirefox) {
-        // Tickle Firefox's old bindings.
-        source.__lookupGetter__(name);
-      }
-      var descriptor = getDescriptor(source, name);
-      var getter, setter;
-      if (allowMethod && typeof descriptor.value === 'function') {
-        target[name] = getMethod(name);
-        continue;
-      }
-
-      var isEvent = isEventHandlerName(name);
-      if (isEvent)
-        getter = scope.getEventHandlerGetter(name);
-      else
-        getter = getGetter(name);
-
-      if (descriptor.writable || descriptor.set || isBrokenSafari) {
-        if (isEvent)
-          setter = scope.getEventHandlerSetter(name);
-        else
-          setter = getSetter(name);
-      }
-
-      defineProperty(target, name, {
-        get: getter,
-        set: setter,
-        configurable: descriptor.configurable,
-        enumerable: descriptor.enumerable
-      });
-    }
-  }
-
-  /**
-   * @param {Function} nativeConstructor
-   * @param {Function} wrapperConstructor
-   * @param {Object=} opt_instance If present, this is used to extract
-   *     properties from an instance object.
-   */
-  function register(nativeConstructor, wrapperConstructor, opt_instance) {
-    var nativePrototype = nativeConstructor.prototype;
-    registerInternal(nativePrototype, wrapperConstructor, opt_instance);
-    mixinStatics(wrapperConstructor, nativeConstructor);
-  }
-
-  function registerInternal(nativePrototype, wrapperConstructor, opt_instance) {
-    var wrapperPrototype = wrapperConstructor.prototype;
-    assert(constructorTable.get(nativePrototype) === undefined);
-
-    constructorTable.set(nativePrototype, wrapperConstructor);
-    nativePrototypeTable.set(wrapperPrototype, nativePrototype);
-
-    addForwardingProperties(nativePrototype, wrapperPrototype);
-    if (opt_instance)
-      registerInstanceProperties(wrapperPrototype, opt_instance);
-
-    defineNonEnumerableDataProperty(
-        wrapperPrototype, 'constructor', wrapperConstructor);
-    // Set it again. Some VMs optimizes objects that are used as prototypes.
-    wrapperConstructor.prototype = wrapperPrototype;
-  }
-
-  function isWrapperFor(wrapperConstructor, nativeConstructor) {
-    return constructorTable.get(nativeConstructor.prototype) ===
-        wrapperConstructor;
-  }
-
-  /**
-   * Creates a generic wrapper constructor based on |object| and its
-   * constructor.
-   * @param {Node} object
-   * @return {Function} The generated constructor.
-   */
-  function registerObject(object) {
-    var nativePrototype = Object.getPrototypeOf(object);
-
-    var superWrapperConstructor = getWrapperConstructor(nativePrototype);
-    var GeneratedWrapper = createWrapperConstructor(superWrapperConstructor);
-    registerInternal(nativePrototype, GeneratedWrapper, object);
-
-    return GeneratedWrapper;
-  }
-
-  function createWrapperConstructor(superWrapperConstructor) {
-    function GeneratedWrapper(node) {
-      superWrapperConstructor.call(this, node);
-    }
-    var p = Object.create(superWrapperConstructor.prototype);
-    p.constructor = GeneratedWrapper;
-    GeneratedWrapper.prototype = p;
-
-    return GeneratedWrapper;
-  }
-
-  function isWrapper(object) {
-    return object && object.__impl4cf1e782hg__;
-  }
-
-  function isNative(object) {
-    return !isWrapper(object);
-  }
-
-  /**
-   * Wraps a node in a WrapperNode. If there already exists a wrapper for the
-   * |node| that wrapper is returned instead.
-   * @param {Node} node
-   * @return {WrapperNode}
-   */
-  function wrap(impl) {
-    if (impl === null)
-      return null;
-
-    assert(isNative(impl));
-    return impl.__wrapper8e3dd93a60__ ||
-        (impl.__wrapper8e3dd93a60__ = new (getWrapperConstructor(impl))(impl));
-  }
-
-  /**
-   * Unwraps a wrapper and returns the node it is wrapping.
-   * @param {WrapperNode} wrapper
-   * @return {Node}
-   */
-  function unwrap(wrapper) {
-    if (wrapper === null)
-      return null;
-    assert(isWrapper(wrapper));
-    return wrapper.__impl4cf1e782hg__;
-  }
-
-  function unsafeUnwrap(wrapper) {
-    return wrapper.__impl4cf1e782hg__;
-  }
-
-  function setWrapper(impl, wrapper) {
-    wrapper.__impl4cf1e782hg__ = impl;
-    impl.__wrapper8e3dd93a60__ = wrapper;
-  }
-
-  /**
-   * Unwraps object if it is a wrapper.
-   * @param {Object} object
-   * @return {Object} The native implementation object.
-   */
-  function unwrapIfNeeded(object) {
-    return object && isWrapper(object) ? unwrap(object) : object;
-  }
-
-  /**
-   * Wraps object if it is not a wrapper.
-   * @param {Object} object
-   * @return {Object} The wrapper for object.
-   */
-  function wrapIfNeeded(object) {
-    return object && !isWrapper(object) ? wrap(object) : object;
-  }
-
-  /**
-   * Overrides the current wrapper (if any) for node.
-   * @param {Node} node
-   * @param {WrapperNode=} wrapper If left out the wrapper will be created as
-   *     needed next time someone wraps the node.
-   */
-  function rewrap(node, wrapper) {
-    if (wrapper === null)
-      return;
-    assert(isNative(node));
-    assert(wrapper === undefined || isWrapper(wrapper));
-    node.__wrapper8e3dd93a60__ = wrapper;
-  }
-
-  var getterDescriptor = {
-    get: undefined,
-    configurable: true,
-    enumerable: true
-  };
-
-  function defineGetter(constructor, name, getter) {
-    getterDescriptor.get = getter;
-    defineProperty(constructor.prototype, name, getterDescriptor);
-  }
-
-  function defineWrapGetter(constructor, name) {
-    defineGetter(constructor, name, function() {
-      return wrap(this.__impl4cf1e782hg__[name]);
-    });
-  }
-
-  /**
-   * Forwards existing methods on the native object to the wrapper methods.
-   * This does not wrap any of the arguments or the return value since the
-   * wrapper implementation already takes care of that.
-   * @param {Array.<Function>} constructors
-   * @parem {Array.<string>} names
-   */
-  function forwardMethodsToWrapper(constructors, names) {
-    constructors.forEach(function(constructor) {
-      names.forEach(function(name) {
-        constructor.prototype[name] = function() {
-          var w = wrapIfNeeded(this);
-          return w[name].apply(w, arguments);
-        };
-      });
-    });
-  }
-
-  scope.assert = assert;
-  scope.constructorTable = constructorTable;
-  scope.defineGetter = defineGetter;
-  scope.defineWrapGetter = defineWrapGetter;
-  scope.forwardMethodsToWrapper = forwardMethodsToWrapper;
-  scope.isWrapper = isWrapper;
-  scope.isWrapperFor = isWrapperFor;
-  scope.mixin = mixin;
-  scope.nativePrototypeTable = nativePrototypeTable;
-  scope.oneOf = oneOf;
-  scope.registerObject = registerObject;
-  scope.registerWrapper = register;
-  scope.rewrap = rewrap;
-  scope.setWrapper = setWrapper;
-  scope.unsafeUnwrap = unsafeUnwrap;
-  scope.unwrap = unwrap;
-  scope.unwrapIfNeeded = unwrapIfNeeded;
-  scope.wrap = wrap;
-  scope.wrapIfNeeded = wrapIfNeeded;
-  scope.wrappers = wrappers;
-
-})(window.ShadowDOMPolyfill);
-
-/*
- * Copyright 2013 The Polymer Authors. All rights reserved.
- * Use of this source code is goverened by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
-(function(context) {
-  'use strict';
-
-  var OriginalMutationObserver = window.MutationObserver;
-  var callbacks = [];
-  var pending = false;
-  var timerFunc;
-
-  function handle() {
-    pending = false;
-    var copies = callbacks.slice(0);
-    callbacks = [];
-    for (var i = 0; i < copies.length; i++) {
-      (0, copies[i])();
-    }
-  }
-
-  if (OriginalMutationObserver) {
-    var counter = 1;
-    var observer = new OriginalMutationObserver(handle);
-    var textNode = document.createTextNode(counter);
-    observer.observe(textNode, {characterData: true});
-
-    timerFunc = function() {
-      counter = (counter + 1) % 2;
-      textNode.data = counter;
-    };
-
-  } else {
-    timerFunc = window.setImmediate || window.setTimeout;
-  }
-
-  function setEndOfMicrotask(func) {
-    callbacks.push(func);
-    if (pending)
-      return;
-    pending = true;
-    timerFunc(handle, 0);
-  }
-
-  context.setEndOfMicrotask = setEndOfMicrotask;
-
-})(window.ShadowDOMPolyfill);
-
-/*
- * Copyright 2013 The Polymer Authors. All rights reserved.
- * Use of this source code is goverened by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
-(function(scope) {
-  'use strict';
-
-  var setEndOfMicrotask = scope.setEndOfMicrotask
-  var wrapIfNeeded = scope.wrapIfNeeded
-  var wrappers = scope.wrappers;
-
-  var registrationsTable = new WeakMap();
-  var globalMutationObservers = [];
-  var isScheduled = false;
-
-  function scheduleCallback(observer) {
-    if (observer.scheduled_)
-      return;
-
-    observer.scheduled_ = true;
-    globalMutationObservers.push(observer);
-
-    if (isScheduled)
-      return;
-    setEndOfMicrotask(notifyObservers);
-    isScheduled = true;
-  }
-
-  // http://dom.spec.whatwg.org/#mutation-observers
-  function notifyObservers() {
-    isScheduled = false;
-
-    while (globalMutationObservers.length) {
-      var notifyList = globalMutationObservers;
-      globalMutationObservers = [];
-
-      // Deliver changes in birth order of the MutationObservers.
-      notifyList.sort(function(x, y) { return x.uid_ - y.uid_; });
-
-      for (var i = 0; i < notifyList.length; i++) {
-        var mo = notifyList[i];
-        mo.scheduled_ = false;
-        var queue = mo.takeRecords();
-        removeTransientObserversFor(mo);
-        if (queue.length) {
-          mo.callback_(queue, mo);
-        }
-      }
-    }
-  }
-
-
-  /**
-   * @param {string} type
-   * @param {Node} target
-   * @constructor
-   */
-  function MutationRecord(type, target) {
-    this.type = type;
-    this.target = target;
-    this.addedNodes = new wrappers.NodeList();
-    this.removedNodes = new wrappers.NodeList();
-    this.previousSibling = null;
-    this.nextSibling = null;
-    this.attributeName = null;
-    this.attributeNamespace = null;
-    this.oldValue = null;
-  }
-
-  /**
-   * Registers transient observers to ancestor and its ancesors for the node
-   * which was removed.
-   * @param {!Node} ancestor
-   * @param {!Node} node
-   */
-  function registerTransientObservers(ancestor, node) {
-    for (; ancestor; ancestor = ancestor.parentNode) {
-      var registrations = registrationsTable.get(ancestor);
-      if (!registrations)
-        continue;
-      for (var i = 0; i < registrations.length; i++) {
-        var registration = registrations[i];
-        if (registration.options.subtree)
-          registration.addTransientObserver(node);
-      }
-    }
-  }
-
-  function removeTransientObserversFor(observer) {
-    for (var i = 0; i < observer.nodes_.length; i++) {
-      var node = observer.nodes_[i];
-      var registrations = registrationsTable.get(node);
-      if (!registrations)
-        return;
-      for (var j = 0; j < registrations.length; j++) {
-        var registration = registrations[j];
-        if (registration.observer === observer)
-          registration.removeTransientObservers();
-      }
-    }
-  }
-
-  // http://dom.spec.whatwg.org/#queue-a-mutation-record
-  function enqueueMutation(target, type, data) {
-    // 1.
-    var interestedObservers = Object.create(null);
-    var associatedStrings = Object.create(null);
-
-    // 2.
-    for (var node = target; node; node = node.parentNode) {
-      // 3.
-      var registrations = registrationsTable.get(node);
-      if (!registrations)
-        continue;
-      for (var j = 0; j < registrations.length; j++) {
-        var registration = registrations[j];
-        var options = registration.options;
-        // 1.
-        if (node !== target && !options.subtree)
-          continue;
-
-        // 2.
-        if (type === 'attributes' && !options.attributes)
-          continue;
-
-        // 3. If type is "attributes", options's attributeFilter is present, and
-        // either options's attributeFilter does not contain name or namespace
-        // is non-null, continue.
-        if (type === 'attributes' && options.attributeFilter &&
-            (data.namespace !== null ||
-             options.attributeFilter.indexOf(data.name) === -1)) {
-          continue;
-        }
-
-        // 4.
-        if (type === 'characterData' && !options.characterData)
-          continue;
-
-        // 5.
-        if (type === 'childList' && !options.childList)
-          continue;
-
-        // 6.
-        var observer = registration.observer;
-        interestedObservers[observer.uid_] = observer;
-
-        // 7. If either type is "attributes" and options's attributeOldValue is
-        // true, or type is "characterData" and options's characterDataOldValue
-        // is true, set the paired string of registered observer's observer in
-        // interested observers to oldValue.
-        if (type === 'attributes' && options.attributeOldValue ||
-            type === 'characterData' && options.characterDataOldValue) {
-          associatedStrings[observer.uid_] = data.oldValue;
-        }
-      }
-    }
-
-    // 4.
-    for (var uid in interestedObservers) {
-      var observer = interestedObservers[uid];
-      var record = new MutationRecord(type, target);
-
-      // 2.
-      if ('name' in data && 'namespace' in data) {
-        record.attributeName = data.name;
-        record.attributeNamespace = data.namespace;
-      }
-
-      // 3.
-      if (data.addedNodes)
-        record.addedNodes = data.addedNodes;
-
-      // 4.
-      if (data.removedNodes)
-        record.removedNodes = data.removedNodes;
-
-      // 5.
-      if (data.previousSibling)
-        record.previousSibling = data.previousSibling;
-
-      // 6.
-      if (data.nextSibling)
-        record.nextSibling = data.nextSibling;
-
-      // 7.
-      if (associatedStrings[uid] !== undefined)
-        record.oldValue = associatedStrings[uid];
-
-      // 8.
-      scheduleCallback(observer);
-      observer.records_.push(record);
-    }
-  }
-
-  var slice = Array.prototype.slice;
-
-  /**
-   * @param {!Object} options
-   * @constructor
-   */
-  function MutationObserverOptions(options) {
-    this.childList = !!options.childList;
-    this.subtree = !!options.subtree;
-
-    // 1. If either options' attributeOldValue or attributeFilter is present
-    // and options' attributes is omitted, set options' attributes to true.
-    if (!('attributes' in options) &&
-        ('attributeOldValue' in options || 'attributeFilter' in options)) {
-      this.attributes = true;
-    } else {
-      this.attributes = !!options.attributes;
-    }
-
-    // 2. If options' characterDataOldValue is present and options'
-    // characterData is omitted, set options' characterData to true.
-    if ('characterDataOldValue' in options && !('characterData' in options))
-      this.characterData = true;
-    else
-      this.characterData = !!options.characterData;
-
-    // 3. & 4.
-    if (!this.attributes &&
-        (options.attributeOldValue || 'attributeFilter' in options) ||
-        // 5.
-        !this.characterData && options.characterDataOldValue) {
-      throw new TypeError();
-    }
-
-    this.characterData = !!options.characterData;
-    this.attributeOldValue = !!options.attributeOldValue;
-    this.characterDataOldValue = !!options.characterDataOldValue;
-    if ('attributeFilter' in options) {
-      if (options.attributeFilter == null ||
-          typeof options.attributeFilter !== 'object') {
-        throw new TypeError();
-      }
-      this.attributeFilter = slice.call(options.attributeFilter);
-    } else {
-      this.attributeFilter = null;
-    }
-  }
-
-  var uidCounter = 0;
-
-  /**
-   * The class that maps to the DOM MutationObserver interface.
-   * @param {Function} callback.
-   * @constructor
-   */
-  function MutationObserver(callback) {
-    this.callback_ = callback;
-    this.nodes_ = [];
-    this.records_ = [];
-    this.uid_ = ++uidCounter;
-    this.scheduled_ = false;
-  }
-
-  MutationObserver.prototype = {
-    constructor: MutationObserver,
-
-    // http://dom.spec.whatwg.org/#dom-mutationobserver-observe
-    observe: function(target, options) {
-      target = wrapIfNeeded(target);
-
-      var newOptions = new MutationObserverOptions(options);
-
-      // 6.
-      var registration;
-      var registrations = registrationsTable.get(target);
-      if (!registrations)
-        registrationsTable.set(target, registrations = []);
-
-      for (var i = 0; i < registrations.length; i++) {
-        if (registrations[i].observer === this) {
-          registration = registrations[i];
-          // 6.1.
-          registration.removeTransientObservers();
-          // 6.2.
-          registration.options = newOptions;
-        }
-      }
-
-      // 7.
-      if (!registration) {
-        registration = new Registration(this, target, newOptions);
-        registrations.push(registration);
-        this.nodes_.push(target);
-      }
-    },
-
-    // http://dom.spec.whatwg.org/#dom-mutationobserver-disconnect
-    disconnect: function() {
-      this.nodes_.forEach(function(node) {
-        var registrations = registrationsTable.get(node);
-        for (var i = 0; i < registrations.length; i++) {
-          var registration = registrations[i];
-          if (registration.observer === this) {
-            registrations.splice(i, 1);
-            // Each node can only have one registered observer associated with
-            // this observer.
-            break;
-          }
-        }
-      }, this);
-      this.records_ = [];
-    },
-
-    takeRecords: function() {
-      var copyOfRecords = this.records_;
-      this.records_ = [];
-      return copyOfRecords;
-    }
-  };
-
-  /**
-   * Class used to represent a registered observer.
-   * @param {MutationObserver} observer
-   * @param {Node} target
-   * @param {MutationObserverOptions} options
-   * @constructor
-   */
-  function Registration(observer, target, options) {
-    this.observer = observer;
-    this.target = target;
-    this.options = options;
-    this.transientObservedNodes = [];
-  }
-
-  Registration.prototype = {
-    /**
-     * Adds a transient observer on node. The transient observer gets removed
-     * next time we deliver the change records.
-     * @param {Node} node
-     */
-    addTransientObserver: function(node) {
-      // Don't add transient observers on the target itself. We already have all
-      // the required listeners set up on the target.
-      if (node === this.target)
-        return;
-
-      // Make sure we remove transient observers at the end of microtask, even
-      // if we didn't get any change records.
-      scheduleCallback(this.observer);
-
-      this.transientObservedNodes.push(node);
-      var registrations = registrationsTable.get(node);
-      if (!registrations)
-        registrationsTable.set(node, registrations = []);
-
-      // We know that registrations does not contain this because we already
-      // checked if node === this.target.
-      registrations.push(this);
-    },
-
-    removeTransientObservers: function() {
-      var transientObservedNodes = this.transientObservedNodes;
-      this.transientObservedNodes = [];
-
-      for (var i = 0; i < transientObservedNodes.length; i++) {
-        var node = transientObservedNodes[i];
-        var registrations = registrationsTable.get(node);
-        for (var j = 0; j < registrations.length; j++) {
-          if (registrations[j] === this) {
-            registrations.splice(j, 1);
-            // Each node can only have one registered observer associated with
-            // this observer.
-            break;
-          }
-        }
-      }
-    }
-  };
-
-  scope.enqueueMutation = enqueueMutation;
-  scope.registerTransientObservers = registerTransientObservers;
-  scope.wrappers.MutationObserver = MutationObserver;
-  scope.wrappers.MutationRecord = MutationRecord;
-
-})(window.ShadowDOMPolyfill);
-
-/**
- * Copyright 2014 The Polymer Authors. All rights reserved.
- * Use of this source code is goverened by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
-(function(scope) {
-  'use strict';
-
-  /**
-   * A tree scope represents the root of a tree. All nodes in a tree point to
-   * the same TreeScope object. The tree scope of a node get set the first time
-   * it is accessed or when a node is added or remove to a tree.
-   *
-   * The root is a Node that has no parent.
-   *
-   * The parent is another TreeScope. For ShadowRoots, it is the TreeScope of
-   * the host of the ShadowRoot.
-   *
-   * @param {!Node} root
-   * @param {TreeScope} parent
-   * @constructor
-   */
-  function TreeScope(root, parent) {
-    /** @type {!Node} */
-    this.root = root;
-
-    /** @type {TreeScope} */
-    this.parent = parent;
-  }
-
-  TreeScope.prototype = {
-    get renderer() {
-      if (this.root instanceof scope.wrappers.ShadowRoot) {
-        return scope.getRendererForHost(this.root.host);
-      }
-      return null;
-    },
-
-    contains: function(treeScope) {
-      for (; treeScope; treeScope = treeScope.parent) {
-        if (treeScope === this)
-          return true;
-      }
-      return false;
-    }
-  };
-
-  function setTreeScope(node, treeScope) {
-    if (node.treeScope_ !== treeScope) {
-      node.treeScope_ = treeScope;
-      for (var sr = node.shadowRoot; sr; sr = sr.olderShadowRoot) {
-        sr.treeScope_.parent = treeScope;
-      }
-      for (var child = node.firstChild; child; child = child.nextSibling) {
-        setTreeScope(child, treeScope);
-      }
-    }
-  }
-
-  function getTreeScope(node) {
-    if (node instanceof scope.wrappers.Window) {
-      debugger;
-    }
-
-    if (node.treeScope_)
-      return node.treeScope_;
-    var parent = node.parentNode;
-    var treeScope;
-    if (parent)
-      treeScope = getTreeScope(parent);
-    else
-      treeScope = new TreeScope(node, null);
-    return node.treeScope_ = treeScope;
-  }
-
-  scope.TreeScope = TreeScope;
-  scope.getTreeScope = getTreeScope;
-  scope.setTreeScope = setTreeScope;
-
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var forwardMethodsToWrapper = scope.forwardMethodsToWrapper;
-  var getTreeScope = scope.getTreeScope;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var setWrapper = scope.setWrapper;
-  var unsafeUnwrap = scope.unsafeUnwrap;
-  var unwrap = scope.unwrap;
-  var wrap = scope.wrap;
-  var wrappers = scope.wrappers;
-
-  var wrappedFuns = new WeakMap();
-  var listenersTable = new WeakMap();
-  var handledEventsTable = new WeakMap();
-  var currentlyDispatchingEvents = new WeakMap();
-  var targetTable = new WeakMap();
-  var currentTargetTable = new WeakMap();
-  var relatedTargetTable = new WeakMap();
-  var eventPhaseTable = new WeakMap();
-  var stopPropagationTable = new WeakMap();
-  var stopImmediatePropagationTable = new WeakMap();
-  var eventHandlersTable = new WeakMap();
-  var eventPathTable = new WeakMap();
-
-  function isShadowRoot(node) {
-    return node instanceof wrappers.ShadowRoot;
-  }
-
-  function rootOfNode(node) {
-    return getTreeScope(node).root;
-  }
-
-  // http://w3c.github.io/webcomponents/spec/shadow/#event-paths
-  function getEventPath(node, event) {
-    var path = [];
-    var current = node;
-    path.push(current);
-    while (current) {
-      // 4.1.
-      var destinationInsertionPoints = getDestinationInsertionPoints(current);
-      if (destinationInsertionPoints && destinationInsertionPoints.length > 0) {
-        // 4.1.1
-        for (var i = 0; i < destinationInsertionPoints.length; i++) {
-          var insertionPoint = destinationInsertionPoints[i];
-          // 4.1.1.1
-          if (isShadowInsertionPoint(insertionPoint)) {
-            var shadowRoot = rootOfNode(insertionPoint);
-            // 4.1.1.1.2
-            var olderShadowRoot = shadowRoot.olderShadowRoot;
-            if (olderShadowRoot)
-              path.push(olderShadowRoot);
-          }
-
-          // 4.1.1.2
-          path.push(insertionPoint);
-        }
-
-        // 4.1.2
-        current = destinationInsertionPoints[
-            destinationInsertionPoints.length - 1];
-
-      // 4.2
-      } else {
-        if (isShadowRoot(current)) {
-          if (inSameTree(node, current) && eventMustBeStopped(event)) {
-            // Stop this algorithm
-            break;
-          }
-          current = current.host;
-          path.push(current);
-
-        // 4.2.2
-        } else {
-          current = current.parentNode;
-          if (current)
-            path.push(current);
-        }
-      }
-    }
-
-    return path;
-  }
-
-  // http://w3c.github.io/webcomponents/spec/shadow/#dfn-events-always-stopped
-  function eventMustBeStopped(event) {
-    if (!event)
-      return false;
-
-    switch (event.type) {
-      case 'abort':
-      case 'error':
-      case 'select':
-      case 'change':
-      case 'load':
-      case 'reset':
-      case 'resize':
-      case 'scroll':
-      case 'selectstart':
-        return true;
-    }
-    return false;
-  }
-
-  // http://w3c.github.io/webcomponents/spec/shadow/#dfn-shadow-insertion-point
-  function isShadowInsertionPoint(node) {
-    return node instanceof HTMLShadowElement;
-    // and make sure that there are no shadow precing this?
-    // and that there is no content ancestor?
-  }
-
-  function getDestinationInsertionPoints(node) {
-    return scope.getDestinationInsertionPoints(node);
-  }
-
-  // http://w3c.github.io/webcomponents/spec/shadow/#event-retargeting
-  function eventRetargetting(path, currentTarget) {
-    if (path.length === 0)
-      return currentTarget;
-
-    // The currentTarget might be the window object. Use its document for the
-    // purpose of finding the retargetted node.
-    if (currentTarget instanceof wrappers.Window)
-      currentTarget = currentTarget.document;
-
-    var currentTargetTree = getTreeScope(currentTarget);
-    var originalTarget = path[0];
-    var originalTargetTree = getTreeScope(originalTarget);
-    var relativeTargetTree =
-        lowestCommonInclusiveAncestor(currentTargetTree, originalTargetTree);
-
-    for (var i = 0; i < path.length; i++) {
-      var node = path[i];
-      if (getTreeScope(node) === relativeTargetTree)
-        return node;
-    }
-
-    return path[path.length - 1];
-  }
-
-  function getTreeScopeAncestors(treeScope) {
-    var ancestors = [];
-    for (;treeScope; treeScope = treeScope.parent) {
-      ancestors.push(treeScope);
-    }
-    return ancestors;
-  }
-
-  function lowestCommonInclusiveAncestor(tsA, tsB) {
-    var ancestorsA = getTreeScopeAncestors(tsA);
-    var ancestorsB = getTreeScopeAncestors(tsB);
-
-    var result = null;
-    while (ancestorsA.length > 0 && ancestorsB.length > 0) {
-      var a = ancestorsA.pop();
-      var b = ancestorsB.pop();
-      if (a === b)
-        result = a;
-      else
-        break;
-    }
-    return result;
-  }
-
-  function getTreeScopeRoot(ts) {
-    if (!ts.parent)
-      return ts;
-    return getTreeScopeRoot(ts.parent);
-  }
-
-  function relatedTargetResolution(event, currentTarget, relatedTarget) {
-    // In case the current target is a window use its document for the purpose
-    // of retargetting the related target.
-    if (currentTarget instanceof wrappers.Window)
-      currentTarget = currentTarget.document;
-
-    var currentTargetTree = getTreeScope(currentTarget);
-    var relatedTargetTree = getTreeScope(relatedTarget);
-
-    var relatedTargetEventPath = getEventPath(relatedTarget, event);
-
-    var lowestCommonAncestorTree;
-
-    // 4
-    var lowestCommonAncestorTree =
-        lowestCommonInclusiveAncestor(currentTargetTree, relatedTargetTree);
-
-    // 5
-    if (!lowestCommonAncestorTree)
-      lowestCommonAncestorTree = relatedTargetTree.root;
-
-    // 6
-    for (var commonAncestorTree = lowestCommonAncestorTree;
-         commonAncestorTree;
-         commonAncestorTree = commonAncestorTree.parent) {
-      // 6.1
-      var adjustedRelatedTarget;
-      for (var i = 0; i < relatedTargetEventPath.length; i++) {
-        var node = relatedTargetEventPath[i];
-        if (getTreeScope(node) === commonAncestorTree)
-          return node;
-      }
-    }
-
-    return null;
-  }
-
-  function inSameTree(a, b) {
-    return getTreeScope(a) === getTreeScope(b);
-  }
-
-  var NONE = 0;
-  var CAPTURING_PHASE = 1;
-  var AT_TARGET = 2;
-  var BUBBLING_PHASE = 3;
-
-  // pendingError is used to rethrow the first error we got during an event
-  // dispatch. The browser actually reports all errors but to do that we would
-  // need to rethrow the error asynchronously.
-  var pendingError;
-
-  function dispatchOriginalEvent(originalEvent) {
-    // Make sure this event is only dispatched once.
-    if (handledEventsTable.get(originalEvent))
-      return;
-    handledEventsTable.set(originalEvent, true);
-    dispatchEvent(wrap(originalEvent), wrap(originalEvent.target));
-    if (pendingError) {
-      var err = pendingError;
-      pendingError = null;
-      throw err;
-    }
-  }
-
-
-  function isLoadLikeEvent(event) {
-    switch (event.type) {
-      // http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#events-and-the-window-object
-      case 'load':
-      // http://www.whatwg.org/specs/web-apps/current-work/multipage/browsers.html#unloading-documents
-      case 'beforeunload':
-      case 'unload':
-        return true;
-    }
-    return false;
-  }
-
-  function dispatchEvent(event, originalWrapperTarget) {
-    if (currentlyDispatchingEvents.get(event))
-      throw new Error('InvalidStateError');
-
-    currentlyDispatchingEvents.set(event, true);
-
-    // Render to ensure that the event path is correct.
-    scope.renderAllPending();
-    var eventPath;
-
-    // http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#events-and-the-window-object
-    // All events dispatched on Nodes with a default view, except load events,
-    // should propagate to the Window.
-
-    // http://www.whatwg.org/specs/web-apps/current-work/multipage/the-end.html#the-end
-    var overrideTarget;
-    var win;
-
-    // Should really be not cancelable too but since Firefox has a bug there
-    // we skip that check.
-    // https://bugzilla.mozilla.org/show_bug.cgi?id=999456
-    if (isLoadLikeEvent(event) && !event.bubbles) {
-      var doc = originalWrapperTarget;
-      if (doc instanceof wrappers.Document && (win = doc.defaultView)) {
-        overrideTarget = doc;
-        eventPath = [];
-      }
-    }
-
-    if (!eventPath) {
-      if (originalWrapperTarget instanceof wrappers.Window) {
-        win = originalWrapperTarget;
-        eventPath = [];
-      } else {
-        eventPath = getEventPath(originalWrapperTarget, event);
-
-        if (!isLoadLikeEvent(event)) {
-          var doc = eventPath[eventPath.length - 1];
-          if (doc instanceof wrappers.Document)
-            win = doc.defaultView;
-        }
-      }
-    }
-
-    eventPathTable.set(event, eventPath);
-
-    if (dispatchCapturing(event, eventPath, win, overrideTarget)) {
-      if (dispatchAtTarget(event, eventPath, win, overrideTarget)) {
-        dispatchBubbling(event, eventPath, win, overrideTarget);
-      }
-    }
-
-    eventPhaseTable.set(event, NONE);
-    currentTargetTable.delete(event, null);
-    currentlyDispatchingEvents.delete(event);
-
-    return event.defaultPrevented;
-  }
-
-  function dispatchCapturing(event, eventPath, win, overrideTarget) {
-    var phase = CAPTURING_PHASE;
-
-    if (win) {
-      if (!invoke(win, event, phase, eventPath, overrideTarget))
-        return false;
-    }
-
-    for (var i = eventPath.length - 1; i > 0; i--) {
-      if (!invoke(eventPath[i], event, phase, eventPath, overrideTarget))
-        return false;
-    }
-
-    return true;
-  }
-
-  function dispatchAtTarget(event, eventPath, win, overrideTarget) {
-    var phase = AT_TARGET;
-    var currentTarget = eventPath[0] || win;
-    return invoke(currentTarget, event, phase, eventPath, overrideTarget);
-  }
-
-  function dispatchBubbling(event, eventPath, win, overrideTarget) {
-    var phase = BUBBLING_PHASE;
-    for (var i = 1; i < eventPath.length; i++) {
-      if (!invoke(eventPath[i], event, phase, eventPath, overrideTarget))
-        return;
-    }
-
-    if (win && eventPath.length > 0) {
-      invoke(win, event, phase, eventPath, overrideTarget);
-    }
-  }
-
-  function invoke(currentTarget, event, phase, eventPath, overrideTarget) {
-    var listeners = listenersTable.get(currentTarget);
-    if (!listeners)
-      return true;
-
-    var target = overrideTarget || eventRetargetting(eventPath, currentTarget);
-
-    if (target === currentTarget) {
-      if (phase === CAPTURING_PHASE)
-        return true;
-
-      if (phase === BUBBLING_PHASE)
-         phase = AT_TARGET;
-
-    } else if (phase === BUBBLING_PHASE && !event.bubbles) {
-      return true;
-    }
-
-    if ('relatedTarget' in event) {
-      var originalEvent = unwrap(event);
-      var unwrappedRelatedTarget = originalEvent.relatedTarget;
-
-      // X-Tag sets relatedTarget on a CustomEvent. If they do that there is no
-      // way to have relatedTarget return the adjusted target but worse is that
-      // the originalEvent might not have a relatedTarget so we hit an assert
-      // when we try to wrap it.
-      if (unwrappedRelatedTarget) {
-        // In IE we can get objects that are not EventTargets at this point.
-        // Safari does not have an EventTarget interface so revert to checking
-        // for addEventListener as an approximation.
-        if (unwrappedRelatedTarget instanceof Object &&
-            unwrappedRelatedTarget.addEventListener) {
-          var relatedTarget = wrap(unwrappedRelatedTarget);
-
-          var adjusted =
-              relatedTargetResolution(event, currentTarget, relatedTarget);
-          if (adjusted === target)
-            return true;
-        } else {
-          adjusted = null;
-        }
-        relatedTargetTable.set(event, adjusted);
-      }
-    }
-
-    eventPhaseTable.set(event, phase);
-    var type = event.type;
-
-    var anyRemoved = false;
-    targetTable.set(event, target);
-    currentTargetTable.set(event, currentTarget);
-
-    // Keep track of the invoke depth so that we only clean up the removed
-    // listeners if we are in the outermost invoke.
-    listeners.depth++;
-
-    for (var i = 0, len = listeners.length; i < len; i++) {
-      var listener = listeners[i];
-      if (listener.removed) {
-        anyRemoved = true;
-        continue;
-      }
-
-      if (listener.type !== type ||
-          !listener.capture && phase === CAPTURING_PHASE ||
-          listener.capture && phase === BUBBLING_PHASE) {
-        continue;
-      }
-
-      try {
-        if (typeof listener.handler === 'function')
-          listener.handler.call(currentTarget, event);
-        else
-          listener.handler.handleEvent(event);
-
-        if (stopImmediatePropagationTable.get(event))
-          return false;
-
-      } catch (ex) {
-        if (!pendingError)
-          pendingError = ex;
-      }
-    }
-
-    listeners.depth--;
-
-    if (anyRemoved && listeners.depth === 0) {
-      var copy = listeners.slice();
-      listeners.length = 0;
-      for (var i = 0; i < copy.length; i++) {
-        if (!copy[i].removed)
-          listeners.push(copy[i]);
-      }
-    }
-
-    return !stopPropagationTable.get(event);
-  }
-
-  function Listener(type, handler, capture) {
-    this.type = type;
-    this.handler = handler;
-    this.capture = Boolean(capture);
-  }
-  Listener.prototype = {
-    equals: function(that) {
-      return this.handler === that.handler && this.type === that.type &&
-          this.capture === that.capture;
-    },
-    get removed() {
-      return this.handler === null;
-    },
-    remove: function() {
-      this.handler = null;
-    }
-  };
-
-  var OriginalEvent = window.Event;
-  OriginalEvent.prototype.polymerBlackList_ = {
-    returnValue: true,
-    // TODO(arv): keyLocation is part of KeyboardEvent but Firefox does not
-    // support constructable KeyboardEvent so we keep it here for now.
-    keyLocation: true
-  };
-
-  /**
-   * Creates a new Event wrapper or wraps an existin native Event object.
-   * @param {string|Event} type
-   * @param {Object=} options
-   * @constructor
-   */
-  function Event(type, options) {
-    if (type instanceof OriginalEvent) {
-      var impl = type;
-      // In browsers that do not correctly support BeforeUnloadEvent we get to
-      // the generic Event wrapper but we still want to ensure we create a
-      // BeforeUnloadEvent. Since BeforeUnloadEvent calls super, we need to
-      // prevent reentrancty.
-      if (!OriginalBeforeUnloadEvent && impl.type === 'beforeunload' &&
-          !(this instanceof BeforeUnloadEvent)) {
-        return new BeforeUnloadEvent(impl);
-      }
-      setWrapper(impl, this);
-    } else {
-      return wrap(constructEvent(OriginalEvent, 'Event', type, options));
-    }
-  }
-  Event.prototype = {
-    get target() {
-      return targetTable.get(this);
-    },
-    get currentTarget() {
-      return currentTargetTable.get(this);
-    },
-    get eventPhase() {
-      return eventPhaseTable.get(this);
-    },
-    get path() {
-      var eventPath = eventPathTable.get(this);
-      if (!eventPath)
-        return [];
-      // TODO(arv): Event path should contain window.
-      return eventPath.slice();
-    },
-    stopPropagation: function() {
-      stopPropagationTable.set(this, true);
-    },
-    stopImmediatePropagation: function() {
-      stopPropagationTable.set(this, true);
-      stopImmediatePropagationTable.set(this, true);
-    }
-  };
-  registerWrapper(OriginalEvent, Event, document.createEvent('Event'));
-
-  function unwrapOptions(options) {
-    if (!options || !options.relatedTarget)
-      return options;
-    return Object.create(options, {
-      relatedTarget: {value: unwrap(options.relatedTarget)}
-    });
-  }
-
-  function registerGenericEvent(name, SuperEvent, prototype) {
-    var OriginalEvent = window[name];
-    var GenericEvent = function(type, options) {
-      if (type instanceof OriginalEvent)
-        setWrapper(type, this);
-      else
-        return wrap(constructEvent(OriginalEvent, name, type, options));
-    };
-    GenericEvent.prototype = Object.create(SuperEvent.prototype);
-    if (prototype)
-      mixin(GenericEvent.prototype, prototype);
-    if (OriginalEvent) {
-      // - Old versions of Safari fails on new FocusEvent (and others?).
-      // - IE does not support event constructors.
-      // - createEvent('FocusEvent') throws in Firefox.
-      // => Try the best practice solution first and fallback to the old way
-      // if needed.
-      try {
-        registerWrapper(OriginalEvent, GenericEvent, new OriginalEvent('temp'));
-      } catch (ex) {
-        registerWrapper(OriginalEvent, GenericEvent,
-                        document.createEvent(name));
-      }
-    }
-    return GenericEvent;
-  }
-
-  var UIEvent = registerGenericEvent('UIEvent', Event);
-  var CustomEvent = registerGenericEvent('CustomEvent', Event);
-
-  var relatedTargetProto = {
-    get relatedTarget() {
-      var relatedTarget = relatedTargetTable.get(this);
-      // relatedTarget can be null.
-      if (relatedTarget !== undefined)
-        return relatedTarget;
-      return wrap(unwrap(this).relatedTarget);
-    }
-  };
-
-  function getInitFunction(name, relatedTargetIndex) {
-    return function() {
-      arguments[relatedTargetIndex] = unwrap(arguments[relatedTargetIndex]);
-      var impl = unwrap(this);
-      impl[name].apply(impl, arguments);
-    };
-  }
-
-  var mouseEventProto = mixin({
-    initMouseEvent: getInitFunction('initMouseEvent', 14)
-  }, relatedTargetProto);
-
-  var focusEventProto = mixin({
-    initFocusEvent: getInitFunction('initFocusEvent', 5)
-  }, relatedTargetProto);
-
-  var MouseEvent = registerGenericEvent('MouseEvent', UIEvent, mouseEventProto);
-  var FocusEvent = registerGenericEvent('FocusEvent', UIEvent, focusEventProto);
-
-  // In case the browser does not support event constructors we polyfill that
-  // by calling `createEvent('Foo')` and `initFooEvent` where the arguments to
-  // `initFooEvent` are derived from the registered default event init dict.
-  var defaultInitDicts = Object.create(null);
-
-  var supportsEventConstructors = (function() {
-    try {
-      new window.FocusEvent('focus');
-    } catch (ex) {
-      return false;
-    }
-    return true;
-  })();
-
-  /**
-   * Constructs a new native event.
-   */
-  function constructEvent(OriginalEvent, name, type, options) {
-    if (supportsEventConstructors)
-      return new OriginalEvent(type, unwrapOptions(options));
-
-    // Create the arguments from the default dictionary.
-    var event = unwrap(document.createEvent(name));
-    var defaultDict = defaultInitDicts[name];
-    var args = [type];
-    Object.keys(defaultDict).forEach(function(key) {
-      var v = options != null && key in options ?
-          options[key] : defaultDict[key];
-      if (key === 'relatedTarget')
-        v = unwrap(v);
-      args.push(v);
-    });
-    event['init' + name].apply(event, args);
-    return event;
-  }
-
-  if (!supportsEventConstructors) {
-    var configureEventConstructor = function(name, initDict, superName) {
-      if (superName) {
-        var superDict = defaultInitDicts[superName];
-        initDict = mixin(mixin({}, superDict), initDict);
-      }
-
-      defaultInitDicts[name] = initDict;
-    };
-
-    // The order of the default event init dictionary keys is important, the
-    // arguments to initFooEvent is derived from that.
-    configureEventConstructor('Event', {bubbles: false, cancelable: false});
-    configureEventConstructor('CustomEvent', {detail: null}, 'Event');
-    configureEventConstructor('UIEvent', {view: null, detail: 0}, 'Event');
-    configureEventConstructor('MouseEvent', {
-      screenX: 0,
-      screenY: 0,
-      clientX: 0,
-      clientY: 0,
-      ctrlKey: false,
-      altKey: false,
-      shiftKey: false,
-      metaKey: false,
-      button: 0,
-      relatedTarget: null
-    }, 'UIEvent');
-    configureEventConstructor('FocusEvent', {relatedTarget: null}, 'UIEvent');
-  }
-
-  // Safari 7 does not yet have BeforeUnloadEvent.
-  // https://bugs.webkit.org/show_bug.cgi?id=120849
-  var OriginalBeforeUnloadEvent = window.BeforeUnloadEvent;
-
-  function BeforeUnloadEvent(impl) {
-    Event.call(this, impl);
-  }
-  BeforeUnloadEvent.prototype = Object.create(Event.prototype);
-  mixin(BeforeUnloadEvent.prototype, {
-    get returnValue() {
-      return unsafeUnwrap(this).returnValue;
-    },
-    set returnValue(v) {
-      unsafeUnwrap(this).returnValue = v;
-    }
-  });
-
-  if (OriginalBeforeUnloadEvent)
-    registerWrapper(OriginalBeforeUnloadEvent, BeforeUnloadEvent);
-
-  function isValidListener(fun) {
-    if (typeof fun === 'function')
-      return true;
-    return fun && fun.handleEvent;
-  }
-
-  function isMutationEvent(type) {
-    switch (type) {
-      case 'DOMAttrModified':
-      case 'DOMAttributeNameChanged':
-      case 'DOMCharacterDataModified':
-      case 'DOMElementNameChanged':
-      case 'DOMNodeInserted':
-      case 'DOMNodeInsertedIntoDocument':
-      case 'DOMNodeRemoved':
-      case 'DOMNodeRemovedFromDocument':
-      case 'DOMSubtreeModified':
-        return true;
-    }
-    return false;
-  }
-
-  var OriginalEventTarget = window.EventTarget;
-
-  /**
-   * This represents a wrapper for an EventTarget.
-   * @param {!EventTarget} impl The original event target.
-   * @constructor
-   */
-  function EventTarget(impl) {
-    setWrapper(impl, this);
-  }
-
-  // Node and Window have different internal type checks in WebKit so we cannot
-  // use the same method as the original function.
-  var methodNames = [
-    'addEventListener',
-    'removeEventListener',
-    'dispatchEvent'
-  ];
-
-  [Node, Window].forEach(function(constructor) {
-    var p = constructor.prototype;
-    methodNames.forEach(function(name) {
-      Object.defineProperty(p, name + '_', {value: p[name]});
-    });
-  });
-
-  function getTargetToListenAt(wrapper) {
-    if (wrapper instanceof wrappers.ShadowRoot)
-      wrapper = wrapper.host;
-    return unwrap(wrapper);
-  }
-
-  EventTarget.prototype = {
-    addEventListener: function(type, fun, capture) {
-      if (!isValidListener(fun) || isMutationEvent(type))
-        return;
-
-      var listener = new Listener(type, fun, capture);
-      var listeners = listenersTable.get(this);
-      if (!listeners) {
-        listeners = [];
-        listeners.depth = 0;
-        listenersTable.set(this, listeners);
-      } else {
-        // Might have a duplicate.
-        for (var i = 0; i < listeners.length; i++) {
-          if (listener.equals(listeners[i]))
-            return;
-        }
-      }
-
-      listeners.push(listener);
-
-      var target = getTargetToListenAt(this);
-      target.addEventListener_(type, dispatchOriginalEvent, true);
-    },
-    removeEventListener: function(type, fun, capture) {
-      capture = Boolean(capture);
-      var listeners = listenersTable.get(this);
-      if (!listeners)
-        return;
-      var count = 0, found = false;
-      for (var i = 0; i < listeners.length; i++) {
-        if (listeners[i].type === type && listeners[i].capture === capture) {
-          count++;
-          if (listeners[i].handler === fun) {
-            found = true;
-            listeners[i].remove();
-          }
-        }
-      }
-
-      if (found && count === 1) {
-        var target = getTargetToListenAt(this);
-        target.removeEventListener_(type, dispatchOriginalEvent, true);
-      }
-    },
-    dispatchEvent: function(event) {
-      // We want to use the native dispatchEvent because it triggers the default
-      // actions (like checking a checkbox). However, if there are no listeners
-      // in the composed tree then there are no events that will trigger and
-      // listeners in the non composed tree that are part of the event path are
-      // not notified.
-      //
-      // If we find out that there are no listeners in the composed tree we add
-      // a temporary listener to the target which makes us get called back even
-      // in that case.
-
-      var nativeEvent = unwrap(event);
-      var eventType = nativeEvent.type;
-
-      // Allow dispatching the same event again. This is safe because if user
-      // code calls this during an existing dispatch of the same event the
-      // native dispatchEvent throws (that is required by the spec).
-      handledEventsTable.set(nativeEvent, false);
-
-      // Force rendering since we prefer native dispatch and that works on the
-      // composed tree.
-      scope.renderAllPending();
-
-      var tempListener;
-      if (!hasListenerInAncestors(this, eventType)) {
-        tempListener = function() {};
-        this.addEventListener(eventType, tempListener, true);
-      }
-
-      try {
-        return unwrap(this).dispatchEvent_(nativeEvent);
-      } finally {
-        if (tempListener)
-          this.removeEventListener(eventType, tempListener, true);
-      }
-    }
-  };
-
-  function hasListener(node, type) {
-    var listeners = listenersTable.get(node);
-    if (listeners) {
-      for (var i = 0; i < listeners.length; i++) {
-        if (!listeners[i].removed && listeners[i].type === type)
-          return true;
-      }
-    }
-    return false;
-  }
-
-  function hasListenerInAncestors(target, type) {
-    for (var node = unwrap(target); node; node = node.parentNode) {
-      if (hasListener(wrap(node), type))
-        return true;
-    }
-    return false;
-  }
-
-  if (OriginalEventTarget)
-    registerWrapper(OriginalEventTarget, EventTarget);
-
-  function wrapEventTargetMethods(constructors) {
-    forwardMethodsToWrapper(constructors, methodNames);
-  }
-
-  var originalElementFromPoint = document.elementFromPoint;
-
-  function elementFromPoint(self, document, x, y) {
-    scope.renderAllPending();
-
-    var element =
-        wrap(originalElementFromPoint.call(unsafeUnwrap(document), x, y));
-    if (!element)
-      return null;
-    var path = getEventPath(element, null);
-
-    // scope the path to this TreeScope
-    var idx = path.lastIndexOf(self);
-    if (idx == -1)
-      return null;
-    else
-      path = path.slice(0, idx);
-
-    // TODO(dfreedm): pass idx to eventRetargetting to avoid array copy
-    return eventRetargetting(path, self);
-  }
-
-  /**
-   * Returns a function that is to be used as a getter for `onfoo` properties.
-   * @param {string} name
-   * @return {Function}
-   */
-  function getEventHandlerGetter(name) {
-    return function() {
-      var inlineEventHandlers = eventHandlersTable.get(this);
-      return inlineEventHandlers && inlineEventHandlers[name] &&
-          inlineEventHandlers[name].value || null;
-     };
-  }
-
-  /**
-   * Returns a function that is to be used as a setter for `onfoo` properties.
-   * @param {string} name
-   * @return {Function}
-   */
-  function getEventHandlerSetter(name) {
-    var eventType = name.slice(2);
-    return function(value) {
-      var inlineEventHandlers = eventHandlersTable.get(this);
-      if (!inlineEventHandlers) {
-        inlineEventHandlers = Object.create(null);
-        eventHandlersTable.set(this, inlineEventHandlers);
-      }
-
-      var old = inlineEventHandlers[name];
-      if (old)
-        this.removeEventListener(eventType, old.wrapped, false);
-
-      if (typeof value === 'function') {
-        var wrapped = function(e) {
-          var rv = value.call(this, e);
-          if (rv === false)
-            e.preventDefault();
-          else if (name === 'onbeforeunload' && typeof rv === 'string')
-            e.returnValue = rv;
-          // mouseover uses true for preventDefault but preventDefault for
-          // mouseover is ignored by browsers these day.
-        };
-
-        this.addEventListener(eventType, wrapped, false);
-        inlineEventHandlers[name] = {
-          value: value,
-          wrapped: wrapped
-        };
-      }
-    };
-  }
-
-  scope.elementFromPoint = elementFromPoint;
-  scope.getEventHandlerGetter = getEventHandlerGetter;
-  scope.getEventHandlerSetter = getEventHandlerSetter;
-  scope.wrapEventTargetMethods = wrapEventTargetMethods;
-  scope.wrappers.BeforeUnloadEvent = BeforeUnloadEvent;
-  scope.wrappers.CustomEvent = CustomEvent;
-  scope.wrappers.Event = Event;
-  scope.wrappers.EventTarget = EventTarget;
-  scope.wrappers.FocusEvent = FocusEvent;
-  scope.wrappers.MouseEvent = MouseEvent;
-  scope.wrappers.UIEvent = UIEvent;
-
-})(window.ShadowDOMPolyfill);
-
-/*
- * Copyright 2014 The Polymer Authors. All rights reserved.
- * Use of this source code is goverened by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
-(function(scope) {
-  'use strict';
-
-  var UIEvent = scope.wrappers.UIEvent;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var setWrapper = scope.setWrapper;
-  var unsafeUnwrap = scope.unsafeUnwrap;
-  var wrap = scope.wrap;
-
-  // TouchEvent is WebKit/Blink only.
-  var OriginalTouchEvent = window.TouchEvent;
-  if (!OriginalTouchEvent)
-    return;
-
-  var nativeEvent;
-  try {
-    nativeEvent = document.createEvent('TouchEvent');
-  } catch (ex) {
-    // In Chrome creating a TouchEvent fails if the feature is not turned on
-    // which it isn't on desktop Chrome.
-    return;
-  }
-
-  var nonEnumDescriptor = {enumerable: false};
-
-  function nonEnum(obj, prop) {
-    Object.defineProperty(obj, prop, nonEnumDescriptor);
-  }
-
-  function Touch(impl) {
-    setWrapper(impl, this);
-  }
-
-  Touch.prototype = {
-    get target() {
-      return wrap(unsafeUnwrap(this).target);
-    }
-  };
-
-  var descr = {
-    configurable: true,
-    enumerable: true,
-    get: null
-  };
-
-  [
-    'clientX',
-    'clientY',
-    'screenX',
-    'screenY',
-    'pageX',
-    'pageY',
-    'identifier',
-    'webkitRadiusX',
-    'webkitRadiusY',
-    'webkitRotationAngle',
-    'webkitForce'
-  ].forEach(function(name) {
-    descr.get = function() {
-      return unsafeUnwrap(this)[name];
-    };
-    Object.defineProperty(Touch.prototype, name, descr);
-  });
-
-  function TouchList() {
-    this.length = 0;
-    nonEnum(this, 'length');
-  }
-
-  TouchList.prototype = {
-    item: function(index) {
-      return this[index];
-    }
-  };
-
-  function wrapTouchList(nativeTouchList) {
-    var list = new TouchList();
-    for (var i = 0; i < nativeTouchList.length; i++) {
-      list[i] = new Touch(nativeTouchList[i]);
-    }
-    list.length = i;
-    return list;
-  }
-
-  function TouchEvent(impl) {
-    UIEvent.call(this, impl);
-  }
-
-  TouchEvent.prototype = Object.create(UIEvent.prototype);
-
-  mixin(TouchEvent.prototype, {
-    get touches() {
-      return wrapTouchList(unsafeUnwrap(this).touches);
-    },
-
-    get targetTouches() {
-      return wrapTouchList(unsafeUnwrap(this).targetTouches);
-    },
-
-    get changedTouches() {
-      return wrapTouchList(unsafeUnwrap(this).changedTouches);
-    },
-
-    initTouchEvent: function() {
-      // The only way to use this is to reuse the TouchList from an existing
-      // TouchEvent. Since this is WebKit/Blink proprietary API we will not
-      // implement this until someone screams.
-      throw new Error('Not implemented');
-    }
-  });
-
-  registerWrapper(OriginalTouchEvent, TouchEvent, nativeEvent);
-
-  scope.wrappers.Touch = Touch;
-  scope.wrappers.TouchEvent = TouchEvent;
-  scope.wrappers.TouchList = TouchList;
-
-})(window.ShadowDOMPolyfill);
-
-
-// Copyright 2012 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var unsafeUnwrap = scope.unsafeUnwrap;
-  var wrap = scope.wrap;
-
-  var nonEnumDescriptor = {enumerable: false};
-
-  function nonEnum(obj, prop) {
-    Object.defineProperty(obj, prop, nonEnumDescriptor);
-  }
-
-  function NodeList() {
-    this.length = 0;
-    nonEnum(this, 'length');
-  }
-  NodeList.prototype = {
-    item: function(index) {
-      return this[index];
-    }
-  };
-  nonEnum(NodeList.prototype, 'item');
-
-  function wrapNodeList(list) {
-    if (list == null)
-      return list;
-    var wrapperList = new NodeList();
-    for (var i = 0, length = list.length; i < length; i++) {
-      wrapperList[i] = wrap(list[i]);
-    }
-    wrapperList.length = length;
-    return wrapperList;
-  }
-
-  function addWrapNodeListMethod(wrapperConstructor, name) {
-    wrapperConstructor.prototype[name] = function() {
-      return wrapNodeList(
-          unsafeUnwrap(this)[name].apply(unsafeUnwrap(this), arguments));
-    };
-  }
-
-  scope.wrappers.NodeList = NodeList;
-  scope.addWrapNodeListMethod = addWrapNodeListMethod;
-  scope.wrapNodeList = wrapNodeList;
-
-})(window.ShadowDOMPolyfill);
-
-/*
- * Copyright 2014 The Polymer Authors. All rights reserved.
- * Use of this source code is goverened by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
-(function(scope) {
-  'use strict';
-
-  // TODO(arv): Implement.
-
-  scope.wrapHTMLCollection = scope.wrapNodeList;
-  scope.wrappers.HTMLCollection = scope.wrappers.NodeList;
-
-})(window.ShadowDOMPolyfill);
-
-/**
- * Copyright 2012 The Polymer Authors. All rights reserved.
- * Use of this source code is goverened by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
-(function(scope) {
-  'use strict';
-
-  var EventTarget = scope.wrappers.EventTarget;
-  var NodeList = scope.wrappers.NodeList;
-  var TreeScope = scope.TreeScope;
-  var assert = scope.assert;
-  var defineWrapGetter = scope.defineWrapGetter;
-  var enqueueMutation = scope.enqueueMutation;
-  var getTreeScope = scope.getTreeScope;
-  var isWrapper = scope.isWrapper;
-  var mixin = scope.mixin;
-  var registerTransientObservers = scope.registerTransientObservers;
-  var registerWrapper = scope.registerWrapper;
-  var setTreeScope = scope.setTreeScope;
-  var unsafeUnwrap = scope.unsafeUnwrap;
-  var unwrap = scope.unwrap;
-  var unwrapIfNeeded = scope.unwrapIfNeeded;
-  var wrap = scope.wrap;
-  var wrapIfNeeded = scope.wrapIfNeeded;
-  var wrappers = scope.wrappers;
-
-  function assertIsNodeWrapper(node) {
-    assert(node instanceof Node);
-  }
-
-  function createOneElementNodeList(node) {
-    var nodes = new NodeList();
-    nodes[0] = node;
-    nodes.length = 1;
-    return nodes;
-  }
-
-  var surpressMutations = false;
-
-  /**
-   * Called before node is inserted into a node to enqueue its removal from its
-   * old parent.
-   * @param {!Node} node The node that is about to be removed.
-   * @param {!Node} parent The parent node that the node is being removed from.
-   * @param {!NodeList} nodes The collected nodes.
-   */
-  function enqueueRemovalForInsertedNodes(node, parent, nodes) {
-    enqueueMutation(parent, 'childList', {
-      removedNodes: nodes,
-      previousSibling: node.previousSibling,
-      nextSibling: node.nextSibling
-    });
-  }
-
-  function enqueueRemovalForInsertedDocumentFragment(df, nodes) {
-    enqueueMutation(df, 'childList', {
-      removedNodes: nodes
-    });
-  }
-
-  /**
-   * Collects nodes from a DocumentFragment or a Node for removal followed
-   * by an insertion.
-   *
-   * This updates the internal pointers for node, previousNode and nextNode.
-   */
-  function collectNodes(node, parentNode, previousNode, nextNode) {
-    if (node instanceof DocumentFragment) {
-      var nodes = collectNodesForDocumentFragment(node);
-
-      // The extra loop is to work around bugs with DocumentFragments in IE.
-      surpressMutations = true;
-      for (var i = nodes.length - 1; i >= 0; i--) {
-        node.removeChild(nodes[i]);
-        nodes[i].parentNode_ = parentNode;
-      }
-      surpressMutations = false;
-
-      for (var i = 0; i < nodes.length; i++) {
-        nodes[i].previousSibling_ = nodes[i - 1] || previousNode;
-        nodes[i].nextSibling_ = nodes[i + 1] || nextNode;
-      }
-
-      if (previousNode)
-        previousNode.nextSibling_ = nodes[0];
-      if (nextNode)
-        nextNode.previousSibling_ = nodes[nodes.length - 1];
-
-      return nodes;
-    }
-
-    var nodes = createOneElementNodeList(node);
-    var oldParent = node.parentNode;
-    if (oldParent) {
-      // This will enqueue the mutation record for the removal as needed.
-      oldParent.removeChild(node);
-    }
-
-    node.parentNode_ = parentNode;
-    node.previousSibling_ = previousNode;
-    node.nextSibling_ = nextNode;
-    if (previousNode)
-      previousNode.nextSibling_ = node;
-    if (nextNode)
-      nextNode.previousSibling_ = node;
-
-    return nodes;
-  }
-
-  function collectNodesNative(node) {
-    if (node instanceof DocumentFragment)
-      return collectNodesForDocumentFragment(node);
-
-    var nodes = createOneElementNodeList(node);
-    var oldParent = node.parentNode;
-    if (oldParent)
-      enqueueRemovalForInsertedNodes(node, oldParent, nodes);
-    return nodes;
-  }
-
-  function collectNodesForDocumentFragment(node) {
-    var nodes = new NodeList();
-    var i = 0;
-    for (var child = node.firstChild; child; child = child.nextSibling) {
-      nodes[i++] = child;
-    }
-    nodes.length = i;
-    enqueueRemovalForInsertedDocumentFragment(node, nodes);
-    return nodes;
-  }
-
-  function snapshotNodeList(nodeList) {
-    // NodeLists are not live at the moment so just return the same object.
-    return nodeList;
-  }
-
-  // http://dom.spec.whatwg.org/#node-is-inserted
-  function nodeWasAdded(node, treeScope) {
-    setTreeScope(node, treeScope);
-    node.nodeIsInserted_();
-  }
-
-  function nodesWereAdded(nodes, parent) {
-    var treeScope = getTreeScope(parent);
-    for (var i = 0; i < nodes.length; i++) {
-      nodeWasAdded(nodes[i], treeScope);
-    }
-  }
-
-  // http://dom.spec.whatwg.org/#node-is-removed
-  function nodeWasRemoved(node) {
-    setTreeScope(node, new TreeScope(node, null));
-  }
-
-  function nodesWereRemoved(nodes) {
-    for (var i = 0; i < nodes.length; i++) {
-      nodeWasRemoved(nodes[i]);
-    }
-  }
-
-  function ensureSameOwnerDocument(parent, child) {
-    var ownerDoc = parent.nodeType === Node.DOCUMENT_NODE ?
-        parent : parent.ownerDocument;
-    if (ownerDoc !== child.ownerDocument)
-      ownerDoc.adoptNode(child);
-  }
-
-  function adoptNodesIfNeeded(owner, nodes) {
-    if (!nodes.length)
-      return;
-
-    var ownerDoc = owner.ownerDocument;
-
-    // All nodes have the same ownerDocument when we get here.
-    if (ownerDoc === nodes[0].ownerDocument)
-      return;
-
-    for (var i = 0; i < nodes.length; i++) {
-      scope.adoptNodeNoRemove(nodes[i], ownerDoc);
-    }
-  }
-
-  function unwrapNodesForInsertion(owner, nodes) {
-    adoptNodesIfNeeded(owner, nodes);
-    var length = nodes.length;
-
-    if (length === 1)
-      return unwrap(nodes[0]);
-
-    var df = unwrap(owner.ownerDocument.createDocumentFragment());
-    for (var i = 0; i < length; i++) {
-      df.appendChild(unwrap(nodes[i]));
-    }
-    return df;
-  }
-
-  function clearChildNodes(wrapper) {
-    if (wrapper.firstChild_ !== undefined) {
-      var child = wrapper.firstChild_;
-      while (child) {
-        var tmp = child;
-        child = child.nextSibling_;
-        tmp.parentNode_ = tmp.previousSibling_ = tmp.nextSibling_ = undefined;
-      }
-    }
-    wrapper.firstChild_ = wrapper.lastChild_ = undefined;
-  }
-
-  function removeAllChildNodes(wrapper) {
-    if (wrapper.invalidateShadowRenderer()) {
-      var childWrapper = wrapper.firstChild;
-      while (childWrapper) {
-        assert(childWrapper.parentNode === wrapper);
-        var nextSibling = childWrapper.nextSibling;
-        var childNode = unwrap(childWrapper);
-        var parentNode = childNode.parentNode;
-        if (parentNode)
-          originalRemoveChild.call(parentNode, childNode);
-        childWrapper.previousSibling_ = childWrapper.nextSibling_ =
-            childWrapper.parentNode_ = null;
-        childWrapper = nextSibling;
-      }
-      wrapper.firstChild_ = wrapper.lastChild_ = null;
-    } else {
-      var node = unwrap(wrapper);
-      var child = node.firstChild;
-      var nextSibling;
-      while (child) {
-        nextSibling = child.nextSibling;
-        originalRemoveChild.call(node, child);
-        child = nextSibling;
-      }
-    }
-  }
-
-  function invalidateParent(node) {
-    var p = node.parentNode;
-    return p && p.invalidateShadowRenderer();
-  }
-
-  function cleanupNodes(nodes) {
-    for (var i = 0, n; i < nodes.length; i++) {
-      n = nodes[i];
-      n.parentNode.removeChild(n);
-    }
-  }
-
-  var originalImportNode = document.importNode;
-  var originalCloneNode = window.Node.prototype.cloneNode;
-
-  function cloneNode(node, deep, opt_doc) {
-    var clone;
-    if (opt_doc)
-      clone = wrap(originalImportNode.call(opt_doc, unsafeUnwrap(node), false));
-    else
-      clone = wrap(originalCloneNode.call(unsafeUnwrap(node), false));
-
-    if (deep) {
-      for (var child = node.firstChild; child; child = child.nextSibling) {
-        clone.appendChild(cloneNode(child, true, opt_doc));
-      }
-
-      if (node instanceof wrappers.HTMLTemplateElement) {
-        var cloneContent = clone.content;
-        for (var child = node.content.firstChild;
-             child;
-             child = child.nextSibling) {
-         cloneContent.appendChild(cloneNode(child, true, opt_doc));
-        }
-      }
-    }
-    // TODO(arv): Some HTML elements also clone other data like value.
-    return clone;
-  }
-
-  function contains(self, child) {
-    if (!child || getTreeScope(self) !== getTreeScope(child))
-      return false;
-
-    for (var node = child; node; node = node.parentNode) {
-      if (node === self)
-        return true;
-    }
-    return false;
-  }
-
-  var OriginalNode = window.Node;
-
-  /**
-   * This represents a wrapper of a native DOM node.
-   * @param {!Node} original The original DOM node, aka, the visual DOM node.
-   * @constructor
-   * @extends {EventTarget}
-   */
-  function Node(original) {
-    assert(original instanceof OriginalNode);
-
-    EventTarget.call(this, original);
-
-    // These properties are used to override the visual references with the
-    // logical ones. If the value is undefined it means that the logical is the
-    // same as the visual.
-
-    /**
-     * @type {Node|undefined}
-     * @private
-     */
-    this.parentNode_ = undefined;
-
-    /**
-     * @type {Node|undefined}
-     * @private
-     */
-    this.firstChild_ = undefined;
-
-    /**
-     * @type {Node|undefined}
-     * @private
-     */
-    this.lastChild_ = undefined;
-
-    /**
-     * @type {Node|undefined}
-     * @private
-     */
-    this.nextSibling_ = undefined;
-
-    /**
-     * @type {Node|undefined}
-     * @private
-     */
-    this.previousSibling_ = undefined;
-
-    this.treeScope_ = undefined;
-  }
-
-  var OriginalDocumentFragment = window.DocumentFragment;
-  var originalAppendChild = OriginalNode.prototype.appendChild;
-  var originalCompareDocumentPosition =
-      OriginalNode.prototype.compareDocumentPosition;
-  var originalInsertBefore = OriginalNode.prototype.insertBefore;
-  var originalRemoveChild = OriginalNode.prototype.removeChild;
-  var originalReplaceChild = OriginalNode.prototype.replaceChild;
-
-  var isIe = /Trident/.test(navigator.userAgent);
-
-  var removeChildOriginalHelper = isIe ?
-      function(parent, child) {
-        try {
-          originalRemoveChild.call(parent, child);
-        } catch (ex) {
-          if (!(parent instanceof OriginalDocumentFragment))
-            throw ex;
-        }
-      } :
-      function(parent, child) {
-        originalRemoveChild.call(parent, child);
-      };
-
-  Node.prototype = Object.create(EventTarget.prototype);
-  mixin(Node.prototype, {
-    appendChild: function(childWrapper) {
-      return this.insertBefore(childWrapper, null);
-    },
-
-    insertBefore: function(childWrapper, refWrapper) {
-      assertIsNodeWrapper(childWrapper);
-
-      var refNode;
-      if (refWrapper) {
-        if (isWrapper(refWrapper)) {
-          refNode = unwrap(refWrapper);
-        } else {
-          refNode = refWrapper;
-          refWrapper = wrap(refNode);
-        }
-      } else {
-        refWrapper = null;
-        refNode = null;
-      }
-
-      refWrapper && assert(refWrapper.parentNode === this);
-
-      var nodes;
-      var previousNode =
-          refWrapper ? refWrapper.previousSibling : this.lastChild;
-
-      var useNative = !this.invalidateShadowRenderer() &&
-                      !invalidateParent(childWrapper);
-
-      if (useNative)
-        nodes = collectNodesNative(childWrapper);
-      else
-        nodes = collectNodes(childWrapper, this, previousNode, refWrapper);
-
-      if (useNative) {
-        ensureSameOwnerDocument(this, childWrapper);
-        clearChildNodes(this);
-        originalInsertBefore.call(unsafeUnwrap(this), unwrap(childWrapper), refNode);
-      } else {
-        if (!previousNode)
-          this.firstChild_ = nodes[0];
-        if (!refWrapper) {
-          this.lastChild_ = nodes[nodes.length - 1];
-          if (this.firstChild_ === undefined)
-            this.firstChild_ = this.firstChild;
-        }
-
-        var parentNode = refNode ? refNode.parentNode : unsafeUnwrap(this);
-
-        // insertBefore refWrapper no matter what the parent is?
-        if (parentNode) {
-          originalInsertBefore.call(parentNode,
-              unwrapNodesForInsertion(this, nodes), refNode);
-        } else {
-          adoptNodesIfNeeded(this, nodes);
-        }
-      }
-
-      enqueueMutation(this, 'childList', {
-        addedNodes: nodes,
-        nextSibling: refWrapper,
-        previousSibling: previousNode
-      });
-
-      nodesWereAdded(nodes, this);
-
-      return childWrapper;
-    },
-
-    removeChild: function(childWrapper) {
-      assertIsNodeWrapper(childWrapper);
-      if (childWrapper.parentNode !== this) {
-        // IE has invalid DOM trees at times.
-        var found = false;
-        var childNodes = this.childNodes;
-        for (var ieChild = this.firstChild; ieChild;
-             ieChild = ieChild.nextSibling) {
-          if (ieChild === childWrapper) {
-            found = true;
-            break;
-          }
-        }
-        if (!found) {
-          // TODO(arv): DOMException
-          throw new Error('NotFoundError');
-        }
-      }
-
-      var childNode = unwrap(childWrapper);
-      var childWrapperNextSibling = childWrapper.nextSibling;
-      var childWrapperPreviousSibling = childWrapper.previousSibling;
-
-      if (this.invalidateShadowRenderer()) {
-        // We need to remove the real node from the DOM before updating the
-        // pointers. This is so that that mutation event is dispatched before
-        // the pointers have changed.
-        var thisFirstChild = this.firstChild;
-        var thisLastChild = this.lastChild;
-
-        var parentNode = childNode.parentNode;
-        if (parentNode)
-          removeChildOriginalHelper(parentNode, childNode);
-
-        if (thisFirstChild === childWrapper)
-          this.firstChild_ = childWrapperNextSibling;
-        if (thisLastChild === childWrapper)
-          this.lastChild_ = childWrapperPreviousSibling;
-        if (childWrapperPreviousSibling)
-          childWrapperPreviousSibling.nextSibling_ = childWrapperNextSibling;
-        if (childWrapperNextSibling) {
-          childWrapperNextSibling.previousSibling_ =
-              childWrapperPreviousSibling;
-        }
-
-        childWrapper.previousSibling_ = childWrapper.nextSibling_ =
-            childWrapper.parentNode_ = undefined;
-      } else {
-        clearChildNodes(this);
-        removeChildOriginalHelper(unsafeUnwrap(this), childNode);
-      }
-
-      if (!surpressMutations) {
-        enqueueMutation(this, 'childList', {
-          removedNodes: createOneElementNodeList(childWrapper),
-          nextSibling: childWrapperNextSibling,
-          previousSibling: childWrapperPreviousSibling
-        });
-      }
-
-      registerTransientObservers(this, childWrapper);
-
-      return childWrapper;
-    },
-
-    replaceChild: function(newChildWrapper, oldChildWrapper) {
-      assertIsNodeWrapper(newChildWrapper);
-
-      var oldChildNode;
-      if (isWrapper(oldChildWrapper)) {
-        oldChildNode = unwrap(oldChildWrapper);
-      } else {
-        oldChildNode = oldChildWrapper;
-        oldChildWrapper = wrap(oldChildNode);
-      }
-
-      if (oldChildWrapper.parentNode !== this) {
-        // TODO(arv): DOMException
-        throw new Error('NotFoundError');
-      }
-
-      var nextNode = oldChildWrapper.nextSibling;
-      var previousNode = oldChildWrapper.previousSibling;
-      var nodes;
-
-      var useNative = !this.invalidateShadowRenderer() &&
-                      !invalidateParent(newChildWrapper);
-
-      if (useNative) {
-        nodes = collectNodesNative(newChildWrapper);
-      } else {
-        if (nextNode === newChildWrapper)
-          nextNode = newChildWrapper.nextSibling;
-        nodes = collectNodes(newChildWrapper, this, previousNode, nextNode);
-      }
-
-      if (!useNative) {
-        if (this.firstChild === oldChildWrapper)
-          this.firstChild_ = nodes[0];
-        if (this.lastChild === oldChildWrapper)
-          this.lastChild_ = nodes[nodes.length - 1];
-
-        oldChildWrapper.previousSibling_ = oldChildWrapper.nextSibling_ =
-            oldChildWrapper.parentNode_ = undefined;
-
-        // replaceChild no matter what the parent is?
-        if (oldChildNode.parentNode) {
-          originalReplaceChild.call(
-              oldChildNode.parentNode,
-              unwrapNodesForInsertion(this, nodes),
-              oldChildNode);
-        }
-      } else {
-        ensureSameOwnerDocument(this, newChildWrapper);
-        clearChildNodes(this);
-        originalReplaceChild.call(unsafeUnwrap(this), unwrap(newChildWrapper),
-                                  oldChildNode);
-      }
-
-      enqueueMutation(this, 'childList', {
-        addedNodes: nodes,
-        removedNodes: createOneElementNodeList(oldChildWrapper),
-        nextSibling: nextNode,
-        previousSibling: previousNode
-      });
-
-      nodeWasRemoved(oldChildWrapper);
-      nodesWereAdded(nodes, this);
-
-      return oldChildWrapper;
-    },
-
-    /**
-     * Called after a node was inserted. Subclasses override this to invalidate
-     * the renderer as needed.
-     * @private
-     */
-    nodeIsInserted_: function() {
-      for (var child = this.firstChild; child; child = child.nextSibling) {
-        child.nodeIsInserted_();
-      }
-    },
-
-    hasChildNodes: function() {
-      return this.firstChild !== null;
-    },
-
-    /** @type {Node} */
-    get parentNode() {
-      // If the parentNode has not been overridden, use the original parentNode.
-      return this.parentNode_ !== undefined ?
-          this.parentNode_ : wrap(unsafeUnwrap(this).parentNode);
-    },
-
-    /** @type {Node} */
-    get firstChild() {
-      return this.firstChild_ !== undefined ?
-          this.firstChild_ : wrap(unsafeUnwrap(this).firstChild);
-    },
-
-    /** @type {Node} */
-    get lastChild() {
-      return this.lastChild_ !== undefined ?
-          this.lastChild_ : wrap(unsafeUnwrap(this).lastChild);
-    },
-
-    /** @type {Node} */
-    get nextSibling() {
-      return this.nextSibling_ !== undefined ?
-          this.nextSibling_ : wrap(unsafeUnwrap(this).nextSibling);
-    },
-
-    /** @type {Node} */
-    get previousSibling() {
-      return this.previousSibling_ !== undefined ?
-          this.previousSibling_ : wrap(unsafeUnwrap(this).previousSibling);
-    },
-
-    get parentElement() {
-      var p = this.parentNode;
-      while (p && p.nodeType !== Node.ELEMENT_NODE) {
-        p = p.parentNode;
-      }
-      return p;
-    },
-
-    get textContent() {
-      // TODO(arv): This should fallback to unsafeUnwrap(this).textContent if there
-      // are no shadow trees below or above the context node.
-      var s = '';
-      for (var child = this.firstChild; child; child = child.nextSibling) {
-        if (child.nodeType != Node.COMMENT_NODE) {
-          s += child.textContent;
-        }
-      }
-      return s;
-    },
-    set textContent(textContent) {
-      if (textContent == null) textContent = '';
-      var removedNodes = snapshotNodeList(this.childNodes);
-
-      if (this.invalidateShadowRenderer()) {
-        removeAllChildNodes(this);
-        if (textContent !== '') {
-          var textNode = unsafeUnwrap(this).ownerDocument.createTextNode(textContent);
-          this.appendChild(textNode);
-        }
-      } else {
-        clearChildNodes(this);
-        unsafeUnwrap(this).textContent = textContent;
-      }
-
-      var addedNodes = snapshotNodeList(this.childNodes);
-
-      enqueueMutation(this, 'childList', {
-        addedNodes: addedNodes,
-        removedNodes: removedNodes
-      });
-
-      nodesWereRemoved(removedNodes);
-      nodesWereAdded(addedNodes, this);
-    },
-
-    get childNodes() {
-      var wrapperList = new NodeList();
-      var i = 0;
-      for (var child = this.firstChild; child; child = child.nextSibling) {
-        wrapperList[i++] = child;
-      }
-      wrapperList.length = i;
-      return wrapperList;
-    },
-
-    cloneNode: function(deep) {
-      return cloneNode(this, deep);
-    },
-
-    contains: function(child) {
-      return contains(this, wrapIfNeeded(child));
-    },
-
-    compareDocumentPosition: function(otherNode) {
-      // This only wraps, it therefore only operates on the composed DOM and not
-      // the logical DOM.
-      return originalCompareDocumentPosition.call(unsafeUnwrap(this),
-                                                  unwrapIfNeeded(otherNode));
-    },
-
-    normalize: function() {
-      var nodes = snapshotNodeList(this.childNodes);
-      var remNodes = [];
-      var s = '';
-      var modNode;
-
-      for (var i = 0, n; i < nodes.length; i++) {
-        n = nodes[i];
-        if (n.nodeType === Node.TEXT_NODE) {
-          if (!modNode && !n.data.length)
-            this.removeNode(n);
-          else if (!modNode)
-            modNode = n;
-          else {
-            s += n.data;
-            remNodes.push(n);
-          }
-        } else {
-          if (modNode && remNodes.length) {
-            modNode.data += s;
-            cleanupNodes(remNodes);
-          }
-          remNodes = [];
-          s = '';
-          modNode = null;
-          if (n.childNodes.length)
-            n.normalize();
-        }
-      }
-
-      // handle case where >1 text nodes are the last children
-      if (modNode && remNodes.length) {
-        modNode.data += s;
-        cleanupNodes(remNodes);
-      }
-    }
-  });
-
-  defineWrapGetter(Node, 'ownerDocument');
-
-  // We use a DocumentFragment as a base and then delete the properties of
-  // DocumentFragment.prototype from the wrapper Node. Since delete makes
-  // objects slow in some JS engines we recreate the prototype object.
-  registerWrapper(OriginalNode, Node, document.createDocumentFragment());
-  delete Node.prototype.querySelector;
-  delete Node.prototype.querySelectorAll;
-  Node.prototype = mixin(Object.create(EventTarget.prototype), Node.prototype);
-
-  scope.cloneNode = cloneNode;
-  scope.nodeWasAdded = nodeWasAdded;
-  scope.nodeWasRemoved = nodeWasRemoved;
-  scope.nodesWereAdded = nodesWereAdded;
-  scope.nodesWereRemoved = nodesWereRemoved;
-  scope.originalInsertBefore = originalInsertBefore;
-  scope.originalRemoveChild = originalRemoveChild;
-  scope.snapshotNodeList = snapshotNodeList;
-  scope.wrappers.Node = Node;
-
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var HTMLCollection = scope.wrappers.HTMLCollection;
-  var NodeList = scope.wrappers.NodeList;
-  var getTreeScope = scope.getTreeScope;
-  var unsafeUnwrap = scope.unsafeUnwrap;
-  var wrap = scope.wrap;
-
-  var originalDocumentQuerySelector = document.querySelector;
-  var originalElementQuerySelector = document.documentElement.querySelector;
-
-  var originalDocumentQuerySelectorAll = document.querySelectorAll;
-  var originalElementQuerySelectorAll = document.documentElement.querySelectorAll;
-
-  var originalDocumentGetElementsByTagName = document.getElementsByTagName;
-  var originalElementGetElementsByTagName = document.documentElement.getElementsByTagName;
-
-  var originalDocumentGetElementsByTagNameNS = document.getElementsByTagNameNS;
-  var originalElementGetElementsByTagNameNS = document.documentElement.getElementsByTagNameNS;
-
-  var OriginalElement = window.Element;
-  var OriginalDocument = window.HTMLDocument || window.Document;
-
-  function filterNodeList(list, index, result, deep) {
-    var wrappedItem = null;
-    var root = null;
-    for (var i = 0, length = list.length; i < length; i++) {
-      wrappedItem = wrap(list[i]);
-      if (!deep && (root = getTreeScope(wrappedItem).root)) {
-        if (root instanceof scope.wrappers.ShadowRoot) {
-          continue;
-        }
-      }
-      result[index++] = wrappedItem;
-    }
-
-    return index;
-  }
-
-  function shimSelector(selector) {
-    return String(selector).replace(/\/deep\//g, ' ');
-  }
-
-  function findOne(node, selector) {
-    var m, el = node.firstElementChild;
-    while (el) {
-      if (el.matches(selector))
-        return el;
-      m = findOne(el, selector);
-      if (m)
-        return m;
-      el = el.nextElementSibling;
-    }
-    return null;
-  }
-
-  function matchesSelector(el, selector) {
-    return el.matches(selector);
-  }
-
-  var XHTML_NS = 'http://www.w3.org/1999/xhtml';
-
-  function matchesTagName(el, localName, localNameLowerCase) {
-    var ln = el.localName;
-    return ln === localName ||
-        ln === localNameLowerCase && el.namespaceURI === XHTML_NS;
-  }
-
-  function matchesEveryThing() {
-    return true;
-  }
-
-  function matchesLocalNameOnly(el, ns, localName) {
-    return el.localName === localName;
-  }
-
-  function matchesNameSpace(el, ns) {
-    return el.namespaceURI === ns;
-  }
-
-  function matchesLocalNameNS(el, ns, localName) {
-    return el.namespaceURI === ns && el.localName === localName;
-  }
-
-  function findElements(node, index, result, p, arg0, arg1) {
-    var el = node.firstElementChild;
-    while (el) {
-      if (p(el, arg0, arg1))
-        result[index++] = el;
-      index = findElements(el, index, result, p, arg0, arg1);
-      el = el.nextElementSibling;
-    }
-    return index;
-  }
-
-  // find and findAll will only match Simple Selectors,
-  // Structural Pseudo Classes are not guarenteed to be correct
-  // http://www.w3.org/TR/css3-selectors/#simple-selectors
-
-  function querySelectorAllFiltered(p, index, result, selector, deep) {
-    var target = unsafeUnwrap(this);
-    var list;
-    var root = getTreeScope(this).root;
-    if (root instanceof scope.wrappers.ShadowRoot) {
-      // We are in the shadow tree and the logical tree is
-      // going to be disconnected so we do a manual tree traversal
-      return findElements(this, index, result, p, selector, null);
-    } else if (target instanceof OriginalElement) {
-      list = originalElementQuerySelectorAll.call(target, selector);
-    } else if (target instanceof OriginalDocument) {
-      list = originalDocumentQuerySelectorAll.call(target, selector);
-    } else {
-      // When we get a ShadowRoot the logical tree is going to be disconnected
-      // so we do a manual tree traversal
-      return findElements(this, index, result, p, selector, null);
-    }
-
-    return filterNodeList(list, index, result, deep);
-  }
-
-  var SelectorsInterface = {
-    querySelector: function(selector) {
-      var shimmed = shimSelector(selector);
-      var deep = shimmed !== selector;
-      selector = shimmed;
-
-      var target = unsafeUnwrap(this);
-      var wrappedItem;
-      var root = getTreeScope(this).root;
-      if (root instanceof scope.wrappers.ShadowRoot) {
-        // We are in the shadow tree and the logical tree is
-        // going to be disconnected so we do a manual tree traversal
-        return findOne(this, selector);
-      } else if (target instanceof OriginalElement) {
-        wrappedItem = wrap(originalElementQuerySelector.call(target, selector));
-      } else if (target instanceof OriginalDocument) {
-        wrappedItem = wrap(originalDocumentQuerySelector.call(target, selector));
-      } else {
-        // When we get a ShadowRoot the logical tree is going to be disconnected
-        // so we do a manual tree traversal
-        return findOne(this, selector);
-      }
-
-      if (!wrappedItem) {
-        // When the original query returns nothing
-        // we return nothing (to be consistent with the other wrapped calls)
-        return wrappedItem;
-      } else if (!deep && (root = getTreeScope(wrappedItem).root)) {
-        if (root instanceof scope.wrappers.ShadowRoot) {
-          // When the original query returns an element in the ShadowDOM
-          // we must do a manual tree traversal
-          return findOne(this, selector);
-        }
-      }
-
-      return wrappedItem;
-    },
-    querySelectorAll: function(selector) {
-      var shimmed = shimSelector(selector);
-      var deep = shimmed !== selector;
-      selector = shimmed;
-
-      var result = new NodeList();
-
-      result.length = querySelectorAllFiltered.call(this,
-          matchesSelector,
-          0,
-          result,
-          selector,
-          deep);
-
-      return result;
-    }
-  };
-
-  function getElementsByTagNameFiltered(p, index, result, localName,
-                                        lowercase) {
-    var target = unsafeUnwrap(this);
-    var list;
-    var root = getTreeScope(this).root;
-    if (root instanceof scope.wrappers.ShadowRoot) {
-      // We are in the shadow tree and the logical tree is
-      // going to be disconnected so we do a manual tree traversal
-      return findElements(this, index, result, p, localName, lowercase);
-    } else if (target instanceof OriginalElement) {
-      list = originalElementGetElementsByTagName.call(target, localName,
-                                                      lowercase);
-    } else if (target instanceof OriginalDocument) {
-      list = originalDocumentGetElementsByTagName.call(target, localName,
-                                                       lowercase);
-    } else {
-      // When we get a ShadowRoot the logical tree is going to be disconnected
-      // so we do a manual tree traversal
-      return findElements(this, index, result, p, localName, lowercase);
-    }
-
-    return filterNodeList(list, index, result, false);
-  }
-
-  function getElementsByTagNameNSFiltered(p, index, result, ns, localName) {
-    var target = unsafeUnwrap(this);
-    var list;
-    var root = getTreeScope(this).root;
-    if (root instanceof scope.wrappers.ShadowRoot) {
-      // We are in the shadow tree and the logical tree is
-      // going to be disconnected so we do a manual tree traversal
-      return findElements(this, index, result, p, ns, localName);
-    } else if (target instanceof OriginalElement) {
-      list = originalElementGetElementsByTagNameNS.call(target, ns, localName);
-    } else if (target instanceof OriginalDocument) {
-      list = originalDocumentGetElementsByTagNameNS.call(target, ns, localName);
-    } else {
-      // When we get a ShadowRoot the logical tree is going to be disconnected
-      // so we do a manual tree traversal
-      return findElements(this, index, result, p, ns, localName);
-    }
-
-    return filterNodeList(list, index, result, false);
-  }
-
-  var GetElementsByInterface = {
-    getElementsByTagName: function(localName) {
-      var result = new HTMLCollection();
-      var match = localName === '*' ? matchesEveryThing : matchesTagName;
-
-      result.length = getElementsByTagNameFiltered.call(this,
-          match,
-          0,
-          result,
-          localName,
-          localName.toLowerCase());
-
-      return result;
-    },
-
-    getElementsByClassName: function(className) {
-      // TODO(arv): Check className?
-      return this.querySelectorAll('.' + className);
-    },
-
-    getElementsByTagNameNS: function(ns, localName) {
-      var result = new HTMLCollection();
-      var match = null;
-
-      if (ns === '*') {
-        match = localName === '*' ? matchesEveryThing : matchesLocalNameOnly;
-      } else {
-        match = localName === '*' ? matchesNameSpace : matchesLocalNameNS;
-      }
-
-      result.length = getElementsByTagNameNSFiltered.call(this,
-          match,
-          0,
-          result,
-          ns || null,
-          localName);
-
-      return result;
-    }
-  };
-
-  scope.GetElementsByInterface = GetElementsByInterface;
-  scope.SelectorsInterface = SelectorsInterface;
-
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var NodeList = scope.wrappers.NodeList;
-
-  function forwardElement(node) {
-    while (node && node.nodeType !== Node.ELEMENT_NODE) {
-      node = node.nextSibling;
-    }
-    return node;
-  }
-
-  function backwardsElement(node) {
-    while (node && node.nodeType !== Node.ELEMENT_NODE) {
-      node = node.previousSibling;
-    }
-    return node;
-  }
-
-  var ParentNodeInterface = {
-    get firstElementChild() {
-      return forwardElement(this.firstChild);
-    },
-
-    get lastElementChild() {
-      return backwardsElement(this.lastChild);
-    },
-
-    get childElementCount() {
-      var count = 0;
-      for (var child = this.firstElementChild;
-           child;
-           child = child.nextElementSibling) {
-        count++;
-      }
-      return count;
-    },
-
-    get children() {
-      var wrapperList = new NodeList();
-      var i = 0;
-      for (var child = this.firstElementChild;
-           child;
-           child = child.nextElementSibling) {
-        wrapperList[i++] = child;
-      }
-      wrapperList.length = i;
-      return wrapperList;
-    },
-
-    remove: function() {
-      var p = this.parentNode;
-      if (p)
-        p.removeChild(this);
-    }
-  };
-
-  var ChildNodeInterface = {
-    get nextElementSibling() {
-      return forwardElement(this.nextSibling);
-    },
-
-    get previousElementSibling() {
-      return backwardsElement(this.previousSibling);
-    }
-  };
-
-  scope.ChildNodeInterface = ChildNodeInterface;
-  scope.ParentNodeInterface = ParentNodeInterface;
-
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var ChildNodeInterface = scope.ChildNodeInterface;
-  var Node = scope.wrappers.Node;
-  var enqueueMutation = scope.enqueueMutation;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var unsafeUnwrap = scope.unsafeUnwrap;
-
-  var OriginalCharacterData = window.CharacterData;
-
-  function CharacterData(node) {
-    Node.call(this, node);
-  }
-  CharacterData.prototype = Object.create(Node.prototype);
-  mixin(CharacterData.prototype, {
-    get textContent() {
-      return this.data;
-    },
-    set textContent(value) {
-      this.data = value;
-    },
-    get data() {
-      return unsafeUnwrap(this).data;
-    },
-    set data(value) {
-      var oldValue = unsafeUnwrap(this).data;
-      enqueueMutation(this, 'characterData', {
-        oldValue: oldValue
-      });
-      unsafeUnwrap(this).data = value;
-    }
-  });
-
-  mixin(CharacterData.prototype, ChildNodeInterface);
-
-  registerWrapper(OriginalCharacterData, CharacterData,
-                  document.createTextNode(''));
-
-  scope.wrappers.CharacterData = CharacterData;
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2014 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var CharacterData = scope.wrappers.CharacterData;
-  var enqueueMutation = scope.enqueueMutation;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-
-  function toUInt32(x) {
-    return x >>> 0;
-  }
-
-  var OriginalText = window.Text;
-
-  function Text(node) {
-    CharacterData.call(this, node);
-  }
-  Text.prototype = Object.create(CharacterData.prototype);
-  mixin(Text.prototype, {
-    splitText: function(offset) {
-      offset = toUInt32(offset);
-      var s = this.data;
-      if (offset > s.length)
-        throw new Error('IndexSizeError');
-      var head = s.slice(0, offset);
-      var tail = s.slice(offset);
-      this.data = head;
-      var newTextNode = this.ownerDocument.createTextNode(tail);
-      if (this.parentNode)
-        this.parentNode.insertBefore(newTextNode, this.nextSibling);
-      return newTextNode;
-    }
-  });
-
-  registerWrapper(OriginalText, Text, document.createTextNode(''));
-
-  scope.wrappers.Text = Text;
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2014 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var setWrapper = scope.setWrapper;
-  var unsafeUnwrap = scope.unsafeUnwrap;
-
-  function invalidateClass(el) {
-    scope.invalidateRendererBasedOnAttribute(el, 'class');
-  }
-
-  function DOMTokenList(impl, ownerElement) {
-    setWrapper(impl, this);
-    this.ownerElement_ = ownerElement;
-  }
-
-  DOMTokenList.prototype = {
-    constructor: DOMTokenList,
-    get length() {
-      return unsafeUnwrap(this).length;
-    },
-    item: function(index) {
-      return unsafeUnwrap(this).item(index);
-    },
-    contains: function(token) {
-      return unsafeUnwrap(this).contains(token);
-    },
-    add: function() {
-      unsafeUnwrap(this).add.apply(unsafeUnwrap(this), arguments);
-      invalidateClass(this.ownerElement_);
-    },
-    remove: function() {
-      unsafeUnwrap(this).remove.apply(unsafeUnwrap(this), arguments);
-      invalidateClass(this.ownerElement_);
-    },
-    toggle: function(token) {
-      var rv = unsafeUnwrap(this).toggle.apply(unsafeUnwrap(this), arguments);
-      invalidateClass(this.ownerElement_);
-      return rv;
-    },
-    toString: function() {
-      return unsafeUnwrap(this).toString();
-    }
-  };
-
-  scope.wrappers.DOMTokenList = DOMTokenList;
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var ChildNodeInterface = scope.ChildNodeInterface;
-  var GetElementsByInterface = scope.GetElementsByInterface;
-  var Node = scope.wrappers.Node;
-  var DOMTokenList = scope.wrappers.DOMTokenList;
-  var ParentNodeInterface = scope.ParentNodeInterface;
-  var SelectorsInterface = scope.SelectorsInterface;
-  var addWrapNodeListMethod = scope.addWrapNodeListMethod;
-  var enqueueMutation = scope.enqueueMutation;
-  var mixin = scope.mixin;
-  var oneOf = scope.oneOf;
-  var registerWrapper = scope.registerWrapper;
-  var unsafeUnwrap = scope.unsafeUnwrap;
-  var wrappers = scope.wrappers;
-
-  var OriginalElement = window.Element;
-
-  var matchesNames = [
-    'matches',  // needs to come first.
-    'mozMatchesSelector',
-    'msMatchesSelector',
-    'webkitMatchesSelector',
-  ].filter(function(name) {
-    return OriginalElement.prototype[name];
-  });
-
-  var matchesName = matchesNames[0];
-
-  var originalMatches = OriginalElement.prototype[matchesName];
-
-  function invalidateRendererBasedOnAttribute(element, name) {
-    // Only invalidate if parent node is a shadow host.
-    var p = element.parentNode;
-    if (!p || !p.shadowRoot)
-      return;
-
-    var renderer = scope.getRendererForHost(p);
-    if (renderer.dependsOnAttribute(name))
-      renderer.invalidate();
-  }
-
-  function enqueAttributeChange(element, name, oldValue) {
-    // This is not fully spec compliant. We should use localName (which might
-    // have a different case than name) and the namespace (which requires us
-    // to get the Attr object).
-    enqueueMutation(element, 'attributes', {
-      name: name,
-      namespace: null,
-      oldValue: oldValue
-    });
-  }
-
-  var classListTable = new WeakMap();
-
-  function Element(node) {
-    Node.call(this, node);
-  }
-  Element.prototype = Object.create(Node.prototype);
-  mixin(Element.prototype, {
-    createShadowRoot: function() {
-      var newShadowRoot = new wrappers.ShadowRoot(this);
-      unsafeUnwrap(this).polymerShadowRoot_ = newShadowRoot;
-
-      var renderer = scope.getRendererForHost(this);
-      renderer.invalidate();
-
-      return newShadowRoot;
-    },
-
-    get shadowRoot() {
-      return unsafeUnwrap(this).polymerShadowRoot_ || null;
-    },
-
-    // getDestinationInsertionPoints added in ShadowRenderer.js
-
-    setAttribute: function(name, value) {
-      var oldValue = unsafeUnwrap(this).getAttribute(name);
-      unsafeUnwrap(this).setAttribute(name, value);
-      enqueAttributeChange(this, name, oldValue);
-      invalidateRendererBasedOnAttribute(this, name);
-    },
-
-    removeAttribute: function(name) {
-      var oldValue = unsafeUnwrap(this).getAttribute(name);
-      unsafeUnwrap(this).removeAttribute(name);
-      enqueAttributeChange(this, name, oldValue);
-      invalidateRendererBasedOnAttribute(this, name);
-    },
-
-    matches: function(selector) {
-      return originalMatches.call(unsafeUnwrap(this), selector);
-    },
-
-    get classList() {
-      var list = classListTable.get(this);
-      if (!list) {
-        classListTable.set(this,
-            list = new DOMTokenList(unsafeUnwrap(this).classList, this));
-      }
-      return list;
-    },
-
-    get className() {
-      return unsafeUnwrap(this).className;
-    },
-
-    set className(v) {
-      this.setAttribute('class', v);
-    },
-
-    get id() {
-      return unsafeUnwrap(this).id;
-    },
-
-    set id(v) {
-      this.setAttribute('id', v);
-    }
-  });
-
-  matchesNames.forEach(function(name) {
-    if (name !== 'matches') {
-      Element.prototype[name] = function(selector) {
-        return this.matches(selector);
-      };
-    }
-  });
-
-  if (OriginalElement.prototype.webkitCreateShadowRoot) {
-    Element.prototype.webkitCreateShadowRoot =
-        Element.prototype.createShadowRoot;
-  }
-
-  mixin(Element.prototype, ChildNodeInterface);
-  mixin(Element.prototype, GetElementsByInterface);
-  mixin(Element.prototype, ParentNodeInterface);
-  mixin(Element.prototype, SelectorsInterface);
-
-  registerWrapper(OriginalElement, Element,
-                  document.createElementNS(null, 'x'));
-
-  scope.invalidateRendererBasedOnAttribute = invalidateRendererBasedOnAttribute;
-  scope.matchesNames = matchesNames;
-  scope.wrappers.Element = Element;
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var Element = scope.wrappers.Element;
-  var defineGetter = scope.defineGetter;
-  var enqueueMutation = scope.enqueueMutation;
-  var mixin = scope.mixin;
-  var nodesWereAdded = scope.nodesWereAdded;
-  var nodesWereRemoved = scope.nodesWereRemoved;
-  var registerWrapper = scope.registerWrapper;
-  var snapshotNodeList = scope.snapshotNodeList;
-  var unsafeUnwrap = scope.unsafeUnwrap;
-  var unwrap = scope.unwrap;
-  var wrap = scope.wrap;
-  var wrappers = scope.wrappers;
-
-  /////////////////////////////////////////////////////////////////////////////
-  // innerHTML and outerHTML
-
-  // http://www.whatwg.org/specs/web-apps/current-work/multipage/the-end.html#escapingString
-  var escapeAttrRegExp = /[&\u00A0"]/g;
-  var escapeDataRegExp = /[&\u00A0<>]/g;
-
-  function escapeReplace(c) {
-    switch (c) {
-      case '&':
-        return '&amp;';
-      case '<':
-        return '&lt;';
-      case '>':
-        return '&gt;';
-      case '"':
-        return '&quot;'
-      case '\u00A0':
-        return '&nbsp;';
-    }
-  }
-
-  function escapeAttr(s) {
-    return s.replace(escapeAttrRegExp, escapeReplace);
-  }
-
-  function escapeData(s) {
-    return s.replace(escapeDataRegExp, escapeReplace);
-  }
-
-  function makeSet(arr) {
-    var set = {};
-    for (var i = 0; i < arr.length; i++) {
-      set[arr[i]] = true;
-    }
-    return set;
-  }
-
-  // http://www.whatwg.org/specs/web-apps/current-work/#void-elements
-  var voidElements = makeSet([
-    'area',
-    'base',
-    'br',
-    'col',
-    'command',
-    'embed',
-    'hr',
-    'img',
-    'input',
-    'keygen',
-    'link',
-    'meta',
-    'param',
-    'source',
-    'track',
-    'wbr'
-  ]);
-
-  var plaintextParents = makeSet([
-    'style',
-    'script',
-    'xmp',
-    'iframe',
-    'noembed',
-    'noframes',
-    'plaintext',
-    'noscript'
-  ]);
-
-  function getOuterHTML(node, parentNode) {
-    switch (node.nodeType) {
-      case Node.ELEMENT_NODE:
-        var tagName = node.tagName.toLowerCase();
-        var s = '<' + tagName;
-        var attrs = node.attributes;
-        for (var i = 0, attr; attr = attrs[i]; i++) {
-          s += ' ' + attr.name + '="' + escapeAttr(attr.value) + '"';
-        }
-        s += '>';
-        if (voidElements[tagName])
-          return s;
-
-        return s + getInnerHTML(node) + '</' + tagName + '>';
-
-      case Node.TEXT_NODE:
-        var data = node.data;
-        if (parentNode && plaintextParents[parentNode.localName])
-          return data;
-        return escapeData(data);
-
-      case Node.COMMENT_NODE:
-        return '<!--' + node.data + '-->';
-
-      default:
-        console.error(node);
-        throw new Error('not implemented');
-    }
-  }
-
-  function getInnerHTML(node) {
-    if (node instanceof wrappers.HTMLTemplateElement)
-      node = node.content;
-
-    var s = '';
-    for (var child = node.firstChild; child; child = child.nextSibling) {
-      s += getOuterHTML(child, node);
-    }
-    return s;
-  }
-
-  function setInnerHTML(node, value, opt_tagName) {
-    var tagName = opt_tagName || 'div';
-    node.textContent = '';
-    var tempElement = unwrap(node.ownerDocument.createElement(tagName));
-    tempElement.innerHTML = value;
-    var firstChild;
-    while (firstChild = tempElement.firstChild) {
-      node.appendChild(wrap(firstChild));
-    }
-  }
-
-  // IE11 does not have MSIE in the user agent string.
-  var oldIe = /MSIE/.test(navigator.userAgent);
-
-  var OriginalHTMLElement = window.HTMLElement;
-  var OriginalHTMLTemplateElement = window.HTMLTemplateElement;
-
-  function HTMLElement(node) {
-    Element.call(this, node);
-  }
-  HTMLElement.prototype = Object.create(Element.prototype);
-  mixin(HTMLElement.prototype, {
-    get innerHTML() {
-      return getInnerHTML(this);
-    },
-    set innerHTML(value) {
-      // IE9 does not handle set innerHTML correctly on plaintextParents. It
-      // creates element children. For example
-      //
-      //   scriptElement.innerHTML = '<a>test</a>'
-      //
-      // Creates a single HTMLAnchorElement child.
-      if (oldIe && plaintextParents[this.localName]) {
-        this.textContent = value;
-        return;
-      }
-
-      var removedNodes = snapshotNodeList(this.childNodes);
-
-      if (this.invalidateShadowRenderer()) {
-        if (this instanceof wrappers.HTMLTemplateElement)
-          setInnerHTML(this.content, value);
-        else
-          setInnerHTML(this, value, this.tagName);
-
-      // If we have a non native template element we need to handle this
-      // manually since setting impl.innerHTML would add the html as direct
-      // children and not be moved over to the content fragment.
-      } else if (!OriginalHTMLTemplateElement &&
-                 this instanceof wrappers.HTMLTemplateElement) {
-        setInnerHTML(this.content, value);
-      } else {
-        unsafeUnwrap(this).innerHTML = value;
-      }
-
-      var addedNodes = snapshotNodeList(this.childNodes);
-
-      enqueueMutation(this, 'childList', {
-        addedNodes: addedNodes,
-        removedNodes: removedNodes
-      });
-
-      nodesWereRemoved(removedNodes);
-      nodesWereAdded(addedNodes, this);
-    },
-
-    get outerHTML() {
-      return getOuterHTML(this, this.parentNode);
-    },
-    set outerHTML(value) {
-      var p = this.parentNode;
-      if (p) {
-        p.invalidateShadowRenderer();
-        var df = frag(p, value);
-        p.replaceChild(df, this);
-      }
-    },
-
-    insertAdjacentHTML: function(position, text) {
-      var contextElement, refNode;
-      switch (String(position).toLowerCase()) {
-        case 'beforebegin':
-          contextElement = this.parentNode;
-          refNode = this;
-          break;
-        case 'afterend':
-          contextElement = this.parentNode;
-          refNode = this.nextSibling;
-          break;
-        case 'afterbegin':
-          contextElement = this;
-          refNode = this.firstChild;
-          break;
-        case 'beforeend':
-          contextElement = this;
-          refNode = null;
-          break;
-        default:
-          return;
-      }
-
-      var df = frag(contextElement, text);
-      contextElement.insertBefore(df, refNode);
-    },
-
-    get hidden() {
-      return this.hasAttribute('hidden');
-    },
-    set hidden(v) {
-      if (v) {
-        this.setAttribute('hidden', '');
-      } else {
-        this.removeAttribute('hidden');
-      }
-    }
-  });
-
-  function frag(contextElement, html) {
-    // TODO(arv): This does not work with SVG and other non HTML elements.
-    var p = unwrap(contextElement.cloneNode(false));
-    p.innerHTML = html;
-    var df = unwrap(document.createDocumentFragment());
-    var c;
-    while (c = p.firstChild) {
-      df.appendChild(c);
-    }
-    return wrap(df);
-  }
-
-  function getter(name) {
-    return function() {
-      scope.renderAllPending();
-      return unsafeUnwrap(this)[name];
-    };
-  }
-
-  function getterRequiresRendering(name) {
-    defineGetter(HTMLElement, name, getter(name));
-  }
-
-  [
-    'clientHeight',
-    'clientLeft',
-    'clientTop',
-    'clientWidth',
-    'offsetHeight',
-    'offsetLeft',
-    'offsetTop',
-    'offsetWidth',
-    'scrollHeight',
-    'scrollWidth',
-  ].forEach(getterRequiresRendering);
-
-  function getterAndSetterRequiresRendering(name) {
-    Object.defineProperty(HTMLElement.prototype, name, {
-      get: getter(name),
-      set: function(v) {
-        scope.renderAllPending();
-        unsafeUnwrap(this)[name] = v;
-      },
-      configurable: true,
-      enumerable: true
-    });
-  }
-
-  [
-    'scrollLeft',
-    'scrollTop',
-  ].forEach(getterAndSetterRequiresRendering);
-
-  function methodRequiresRendering(name) {
-    Object.defineProperty(HTMLElement.prototype, name, {
-      value: function() {
-        scope.renderAllPending();
-        return unsafeUnwrap(this)[name].apply(unsafeUnwrap(this), arguments);
-      },
-      configurable: true,
-      enumerable: true
-    });
-  }
-
-  [
-    'getBoundingClientRect',
-    'getClientRects',
-    'scrollIntoView'
-  ].forEach(methodRequiresRendering);
-
-  // HTMLElement is abstract so we use a subclass that has no members.
-  registerWrapper(OriginalHTMLElement, HTMLElement,
-                  document.createElement('b'));
-
-  scope.wrappers.HTMLElement = HTMLElement;
-
-  // TODO: Find a better way to share these two with WrapperShadowRoot.
-  scope.getInnerHTML = getInnerHTML;
-  scope.setInnerHTML = setInnerHTML
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var HTMLElement = scope.wrappers.HTMLElement;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var unsafeUnwrap = scope.unsafeUnwrap;
-  var wrap = scope.wrap;
-
-  var OriginalHTMLCanvasElement = window.HTMLCanvasElement;
-
-  function HTMLCanvasElement(node) {
-    HTMLElement.call(this, node);
-  }
-  HTMLCanvasElement.prototype = Object.create(HTMLElement.prototype);
-
-  mixin(HTMLCanvasElement.prototype, {
-    getContext: function() {
-      var context = unsafeUnwrap(this).getContext.apply(unsafeUnwrap(this), arguments);
-      return context && wrap(context);
-    }
-  });
-
-  registerWrapper(OriginalHTMLCanvasElement, HTMLCanvasElement,
-                  document.createElement('canvas'));
-
-  scope.wrappers.HTMLCanvasElement = HTMLCanvasElement;
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var HTMLElement = scope.wrappers.HTMLElement;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-
-  var OriginalHTMLContentElement = window.HTMLContentElement;
-
-  function HTMLContentElement(node) {
-    HTMLElement.call(this, node);
-  }
-  HTMLContentElement.prototype = Object.create(HTMLElement.prototype);
-  mixin(HTMLContentElement.prototype, {
-    constructor: HTMLContentElement,
-
-    get select() {
-      return this.getAttribute('select');
-    },
-    set select(value) {
-      this.setAttribute('select', value);
-    },
-
-    setAttribute: function(n, v) {
-      HTMLElement.prototype.setAttribute.call(this, n, v);
-      if (String(n).toLowerCase() === 'select')
-        this.invalidateShadowRenderer(true);
-    }
-
-    // getDistributedNodes is added in ShadowRenderer
-  });
-
-  if (OriginalHTMLContentElement)
-    registerWrapper(OriginalHTMLContentElement, HTMLContentElement);
-
-  scope.wrappers.HTMLContentElement = HTMLContentElement;
-})(window.ShadowDOMPolyfill);
-
-/*
- * Copyright 2014 The Polymer Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
-(function(scope) {
-  'use strict';
-
-  var HTMLElement = scope.wrappers.HTMLElement;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var wrapHTMLCollection = scope.wrapHTMLCollection;
-  var unwrap = scope.unwrap;
-
-  var OriginalHTMLFormElement = window.HTMLFormElement;
-
-  function HTMLFormElement(node) {
-    HTMLElement.call(this, node);
-  }
-  HTMLFormElement.prototype = Object.create(HTMLElement.prototype);
-  mixin(HTMLFormElement.prototype, {
-    get elements() {
-      // Note: technically this should be an HTMLFormControlsCollection, but
-      // that inherits from HTMLCollection, so should be good enough. Spec:
-      // http://www.whatwg.org/specs/web-apps/current-work/multipage/common-dom-interfaces.html#htmlformcontrolscollection
-      return wrapHTMLCollection(unwrap(this).elements);
-    }
-  });
-
-  registerWrapper(OriginalHTMLFormElement, HTMLFormElement,
-                  document.createElement('form'));
-
-  scope.wrappers.HTMLFormElement = HTMLFormElement;
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var HTMLElement = scope.wrappers.HTMLElement;
-  var registerWrapper = scope.registerWrapper;
-  var unwrap = scope.unwrap;
-  var rewrap = scope.rewrap;
-
-  var OriginalHTMLImageElement = window.HTMLImageElement;
-
-  function HTMLImageElement(node) {
-    HTMLElement.call(this, node);
-  }
-  HTMLImageElement.prototype = Object.create(HTMLElement.prototype);
-
-  registerWrapper(OriginalHTMLImageElement, HTMLImageElement,
-                  document.createElement('img'));
-
-  function Image(width, height) {
-    if (!(this instanceof Image)) {
-      throw new TypeError(
-          'DOM object constructor cannot be called as a function.');
-    }
-
-    var node = unwrap(document.createElement('img'));
-    HTMLElement.call(this, node);
-    rewrap(node, this);
-
-    if (width !== undefined)
-      node.width = width;
-    if (height !== undefined)
-      node.height = height;
-  }
-
-  Image.prototype = HTMLImageElement.prototype;
-
-  scope.wrappers.HTMLImageElement = HTMLImageElement;
-  scope.wrappers.Image = Image;
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var HTMLElement = scope.wrappers.HTMLElement;
-  var mixin = scope.mixin;
-  var NodeList = scope.wrappers.NodeList;
-  var registerWrapper = scope.registerWrapper;
-
-  var OriginalHTMLShadowElement = window.HTMLShadowElement;
-
-  function HTMLShadowElement(node) {
-    HTMLElement.call(this, node);
-  }
-  HTMLShadowElement.prototype = Object.create(HTMLElement.prototype);
-  HTMLShadowElement.prototype.constructor = HTMLShadowElement;
-
-  // getDistributedNodes is added in ShadowRenderer
-
-  if (OriginalHTMLShadowElement)
-    registerWrapper(OriginalHTMLShadowElement, HTMLShadowElement);
-
-  scope.wrappers.HTMLShadowElement = HTMLShadowElement;
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var HTMLElement = scope.wrappers.HTMLElement;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var unsafeUnwrap = scope.unsafeUnwrap;
-  var unwrap = scope.unwrap;
-  var wrap = scope.wrap;
-
-  var contentTable = new WeakMap();
-  var templateContentsOwnerTable = new WeakMap();
-
-  // http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/templates/index.html#dfn-template-contents-owner
-  function getTemplateContentsOwner(doc) {
-    if (!doc.defaultView)
-      return doc;
-    var d = templateContentsOwnerTable.get(doc);
-    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);
-      }
-      templateContentsOwnerTable.set(doc, d);
-    }
-    return d;
-  }
-
-  function extractContent(templateElement) {
-    // templateElement is not a wrapper here.
-    var doc = getTemplateContentsOwner(templateElement.ownerDocument);
-    var df = unwrap(doc.createDocumentFragment());
-    var child;
-    while (child = templateElement.firstChild) {
-      df.appendChild(child);
-    }
-    return df;
-  }
-
-  var OriginalHTMLTemplateElement = window.HTMLTemplateElement;
-
-  function HTMLTemplateElement(node) {
-    HTMLElement.call(this, node);
-    if (!OriginalHTMLTemplateElement) {
-      var content = extractContent(node);
-      contentTable.set(this, wrap(content));
-    }
-  }
-  HTMLTemplateElement.prototype = Object.create(HTMLElement.prototype);
-
-  mixin(HTMLTemplateElement.prototype, {
-    constructor: HTMLTemplateElement,
-    get content() {
-      if (OriginalHTMLTemplateElement)
-        return wrap(unsafeUnwrap(this).content);
-      return contentTable.get(this);
-    },
-
-    // TODO(arv): cloneNode needs to clone content.
-
-  });
-
-  if (OriginalHTMLTemplateElement)
-    registerWrapper(OriginalHTMLTemplateElement, HTMLTemplateElement);
-
-  scope.wrappers.HTMLTemplateElement = HTMLTemplateElement;
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var HTMLElement = scope.wrappers.HTMLElement;
-  var registerWrapper = scope.registerWrapper;
-
-  var OriginalHTMLMediaElement = window.HTMLMediaElement;
-
-  if (!OriginalHTMLMediaElement) return;
-
-  function HTMLMediaElement(node) {
-    HTMLElement.call(this, node);
-  }
-  HTMLMediaElement.prototype = Object.create(HTMLElement.prototype);
-
-  registerWrapper(OriginalHTMLMediaElement, HTMLMediaElement,
-                  document.createElement('audio'));
-
-  scope.wrappers.HTMLMediaElement = HTMLMediaElement;
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var HTMLMediaElement = scope.wrappers.HTMLMediaElement;
-  var registerWrapper = scope.registerWrapper;
-  var unwrap = scope.unwrap;
-  var rewrap = scope.rewrap;
-
-  var OriginalHTMLAudioElement = window.HTMLAudioElement;
-
-  if (!OriginalHTMLAudioElement) return;
-
-  function HTMLAudioElement(node) {
-    HTMLMediaElement.call(this, node);
-  }
-  HTMLAudioElement.prototype = Object.create(HTMLMediaElement.prototype);
-
-  registerWrapper(OriginalHTMLAudioElement, HTMLAudioElement,
-                  document.createElement('audio'));
-
-  function Audio(src) {
-    if (!(this instanceof Audio)) {
-      throw new TypeError(
-          'DOM object constructor cannot be called as a function.');
-    }
-
-    var node = unwrap(document.createElement('audio'));
-    HTMLMediaElement.call(this, node);
-    rewrap(node, this);
-
-    node.setAttribute('preload', 'auto');
-    if (src !== undefined)
-      node.setAttribute('src', src);
-  }
-
-  Audio.prototype = HTMLAudioElement.prototype;
-
-  scope.wrappers.HTMLAudioElement = HTMLAudioElement;
-  scope.wrappers.Audio = Audio;
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var HTMLElement = scope.wrappers.HTMLElement;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var rewrap = scope.rewrap;
-  var unwrap = scope.unwrap;
-  var wrap = scope.wrap;
-
-  var OriginalHTMLOptionElement = window.HTMLOptionElement;
-
-  function trimText(s) {
-    return s.replace(/\s+/g, ' ').trim();
-  }
-
-  function HTMLOptionElement(node) {
-    HTMLElement.call(this, node);
-  }
-  HTMLOptionElement.prototype = Object.create(HTMLElement.prototype);
-  mixin(HTMLOptionElement.prototype, {
-    get text() {
-      return trimText(this.textContent);
-    },
-    set text(value) {
-      this.textContent = trimText(String(value));
-    },
-    get form() {
-      return wrap(unwrap(this).form);
-    }
-  });
-
-  registerWrapper(OriginalHTMLOptionElement, HTMLOptionElement,
-                  document.createElement('option'));
-
-  function Option(text, value, defaultSelected, selected) {
-    if (!(this instanceof Option)) {
-      throw new TypeError(
-          'DOM object constructor cannot be called as a function.');
-    }
-
-    var node = unwrap(document.createElement('option'));
-    HTMLElement.call(this, node);
-    rewrap(node, this);
-
-    if (text !== undefined)
-      node.text = text;
-    if (value !== undefined)
-      node.setAttribute('value', value);
-    if (defaultSelected === true)
-      node.setAttribute('selected', '');
-    node.selected = selected === true;
-  }
-
-  Option.prototype = HTMLOptionElement.prototype;
-
-  scope.wrappers.HTMLOptionElement = HTMLOptionElement;
-  scope.wrappers.Option = Option;
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2014 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var HTMLElement = scope.wrappers.HTMLElement;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var unwrap = scope.unwrap;
-  var wrap = scope.wrap;
-
-  var OriginalHTMLSelectElement = window.HTMLSelectElement;
-
-  function HTMLSelectElement(node) {
-    HTMLElement.call(this, node);
-  }
-  HTMLSelectElement.prototype = Object.create(HTMLElement.prototype);
-  mixin(HTMLSelectElement.prototype, {
-    add: function(element, before) {
-      if (typeof before === 'object')  // also includes null
-        before = unwrap(before);
-      unwrap(this).add(unwrap(element), before);
-    },
-
-    remove: function(indexOrNode) {
-      // Spec only allows index but implementations allow index or node.
-      // remove() is also allowed which is same as remove(undefined)
-      if (indexOrNode === undefined) {
-        HTMLElement.prototype.remove.call(this);
-        return;
-      }
-
-      if (typeof indexOrNode === 'object')
-        indexOrNode = unwrap(indexOrNode);
-
-      unwrap(this).remove(indexOrNode);
-    },
-
-    get form() {
-      return wrap(unwrap(this).form);
-    }
-  });
-
-  registerWrapper(OriginalHTMLSelectElement, HTMLSelectElement,
-                  document.createElement('select'));
-
-  scope.wrappers.HTMLSelectElement = HTMLSelectElement;
-})(window.ShadowDOMPolyfill);
-
-/*
- * Copyright 2014 The Polymer Authors. All rights reserved.
- * Use of this source code is goverened by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
-(function(scope) {
-  'use strict';
-
-  var HTMLElement = scope.wrappers.HTMLElement;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var unwrap = scope.unwrap;
-  var wrap = scope.wrap;
-  var wrapHTMLCollection = scope.wrapHTMLCollection;
-
-  var OriginalHTMLTableElement = window.HTMLTableElement;
-
-  function HTMLTableElement(node) {
-    HTMLElement.call(this, node);
-  }
-  HTMLTableElement.prototype = Object.create(HTMLElement.prototype);
-  mixin(HTMLTableElement.prototype, {
-    get caption() {
-      return wrap(unwrap(this).caption);
-    },
-    createCaption: function() {
-      return wrap(unwrap(this).createCaption());
-    },
-
-    get tHead() {
-      return wrap(unwrap(this).tHead);
-    },
-    createTHead: function() {
-      return wrap(unwrap(this).createTHead());
-    },
-
-    createTFoot: function() {
-      return wrap(unwrap(this).createTFoot());
-    },
-    get tFoot() {
-      return wrap(unwrap(this).tFoot);
-    },
-
-    get tBodies() {
-      return wrapHTMLCollection(unwrap(this).tBodies);
-    },
-    createTBody: function() {
-      return wrap(unwrap(this).createTBody());
-    },
-
-    get rows() {
-      return wrapHTMLCollection(unwrap(this).rows);
-    },
-    insertRow: function(index) {
-      return wrap(unwrap(this).insertRow(index));
-    }
-  });
-
-  registerWrapper(OriginalHTMLTableElement, HTMLTableElement,
-                  document.createElement('table'));
-
-  scope.wrappers.HTMLTableElement = HTMLTableElement;
-})(window.ShadowDOMPolyfill);
-
-/*
- * Copyright 2014 The Polymer Authors. All rights reserved.
- * Use of this source code is goverened by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
-(function(scope) {
-  'use strict';
-
-  var HTMLElement = scope.wrappers.HTMLElement;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var wrapHTMLCollection = scope.wrapHTMLCollection;
-  var unwrap = scope.unwrap;
-  var wrap = scope.wrap;
-
-  var OriginalHTMLTableSectionElement = window.HTMLTableSectionElement;
-
-  function HTMLTableSectionElement(node) {
-    HTMLElement.call(this, node);
-  }
-  HTMLTableSectionElement.prototype = Object.create(HTMLElement.prototype);
-  mixin(HTMLTableSectionElement.prototype, {
-    constructor: HTMLTableSectionElement,
-    get rows() {
-      return wrapHTMLCollection(unwrap(this).rows);
-    },
-    insertRow: function(index) {
-      return wrap(unwrap(this).insertRow(index));
-    }
-  });
-
-  registerWrapper(OriginalHTMLTableSectionElement, HTMLTableSectionElement,
-                  document.createElement('thead'));
-
-  scope.wrappers.HTMLTableSectionElement = HTMLTableSectionElement;
-})(window.ShadowDOMPolyfill);
-
-/*
- * Copyright 2014 The Polymer Authors. All rights reserved.
- * Use of this source code is goverened by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
-(function(scope) {
-  'use strict';
-
-  var HTMLElement = scope.wrappers.HTMLElement;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var wrapHTMLCollection = scope.wrapHTMLCollection;
-  var unwrap = scope.unwrap;
-  var wrap = scope.wrap;
-
-  var OriginalHTMLTableRowElement = window.HTMLTableRowElement;
-
-  function HTMLTableRowElement(node) {
-    HTMLElement.call(this, node);
-  }
-  HTMLTableRowElement.prototype = Object.create(HTMLElement.prototype);
-  mixin(HTMLTableRowElement.prototype, {
-    get cells() {
-      return wrapHTMLCollection(unwrap(this).cells);
-    },
-
-    insertCell: function(index) {
-      return wrap(unwrap(this).insertCell(index));
-    }
-  });
-
-  registerWrapper(OriginalHTMLTableRowElement, HTMLTableRowElement,
-                  document.createElement('tr'));
-
-  scope.wrappers.HTMLTableRowElement = HTMLTableRowElement;
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var HTMLContentElement = scope.wrappers.HTMLContentElement;
-  var HTMLElement = scope.wrappers.HTMLElement;
-  var HTMLShadowElement = scope.wrappers.HTMLShadowElement;
-  var HTMLTemplateElement = scope.wrappers.HTMLTemplateElement;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-
-  var OriginalHTMLUnknownElement = window.HTMLUnknownElement;
-
-  function HTMLUnknownElement(node) {
-    switch (node.localName) {
-      case 'content':
-        return new HTMLContentElement(node);
-      case 'shadow':
-        return new HTMLShadowElement(node);
-      case 'template':
-        return new HTMLTemplateElement(node);
-    }
-    HTMLElement.call(this, node);
-  }
-  HTMLUnknownElement.prototype = Object.create(HTMLElement.prototype);
-  registerWrapper(OriginalHTMLUnknownElement, HTMLUnknownElement);
-  scope.wrappers.HTMLUnknownElement = HTMLUnknownElement;
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2014 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var Element = scope.wrappers.Element;
-  var HTMLElement = scope.wrappers.HTMLElement;
-  var registerObject = scope.registerObject;
-
-  var SVG_NS = 'http://www.w3.org/2000/svg';
-  var svgTitleElement = document.createElementNS(SVG_NS, 'title');
-  var SVGTitleElement = registerObject(svgTitleElement);
-  var SVGElement = Object.getPrototypeOf(SVGTitleElement.prototype).constructor;
-
-  // IE11 does not have classList for SVG elements. The spec says that classList
-  // is an accessor on Element, but IE11 puts classList on HTMLElement, leaving
-  // SVGElement without a classList property. We therefore move the accessor for
-  // IE11.
-  if (!('classList' in svgTitleElement)) {
-    var descr = Object.getOwnPropertyDescriptor(Element.prototype, 'classList');
-    Object.defineProperty(HTMLElement.prototype, 'classList', descr);
-    delete Element.prototype.classList;
-  }
-
-  scope.wrappers.SVGElement = SVGElement;
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2014 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var unwrap = scope.unwrap;
-  var wrap = scope.wrap;
-
-  var OriginalSVGUseElement = window.SVGUseElement;
-
-  // IE uses SVGElement as parent interface, SVG2 (Blink & Gecko) uses
-  // SVGGraphicsElement. Use the <g> element to get the right prototype.
-
-  var SVG_NS = 'http://www.w3.org/2000/svg';
-  var gWrapper = wrap(document.createElementNS(SVG_NS, 'g'));
-  var useElement = document.createElementNS(SVG_NS, 'use');
-  var SVGGElement = gWrapper.constructor;
-  var parentInterfacePrototype = Object.getPrototypeOf(SVGGElement.prototype);
-  var parentInterface = parentInterfacePrototype.constructor;
-
-  function SVGUseElement(impl) {
-    parentInterface.call(this, impl);
-  }
-
-  SVGUseElement.prototype = Object.create(parentInterfacePrototype);
-
-  // Firefox does not expose instanceRoot.
-  if ('instanceRoot' in useElement) {
-    mixin(SVGUseElement.prototype, {
-      get instanceRoot() {
-        return wrap(unwrap(this).instanceRoot);
-      },
-      get animatedInstanceRoot() {
-        return wrap(unwrap(this).animatedInstanceRoot);
-      },
-    });
-  }
-
-  registerWrapper(OriginalSVGUseElement, SVGUseElement, useElement);
-
-  scope.wrappers.SVGUseElement = SVGUseElement;
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2014 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var EventTarget = scope.wrappers.EventTarget;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var unsafeUnwrap = scope.unsafeUnwrap;
-  var wrap = scope.wrap;
-
-  var OriginalSVGElementInstance = window.SVGElementInstance;
-  if (!OriginalSVGElementInstance)
-    return;
-
-  function SVGElementInstance(impl) {
-    EventTarget.call(this, impl);
-  }
-
-  SVGElementInstance.prototype = Object.create(EventTarget.prototype);
-  mixin(SVGElementInstance.prototype, {
-    /** @type {SVGElement} */
-    get correspondingElement() {
-      return wrap(unsafeUnwrap(this).correspondingElement);
-    },
-
-    /** @type {SVGUseElement} */
-    get correspondingUseElement() {
-      return wrap(unsafeUnwrap(this).correspondingUseElement);
-    },
-
-    /** @type {SVGElementInstance} */
-    get parentNode() {
-      return wrap(unsafeUnwrap(this).parentNode);
-    },
-
-    /** @type {SVGElementInstanceList} */
-    get childNodes() {
-      throw new Error('Not implemented');
-    },
-
-    /** @type {SVGElementInstance} */
-    get firstChild() {
-      return wrap(unsafeUnwrap(this).firstChild);
-    },
-
-    /** @type {SVGElementInstance} */
-    get lastChild() {
-      return wrap(unsafeUnwrap(this).lastChild);
-    },
-
-    /** @type {SVGElementInstance} */
-    get previousSibling() {
-      return wrap(unsafeUnwrap(this).previousSibling);
-    },
-
-    /** @type {SVGElementInstance} */
-    get nextSibling() {
-      return wrap(unsafeUnwrap(this).nextSibling);
-    }
-  });
-
-  registerWrapper(OriginalSVGElementInstance, SVGElementInstance);
-
-  scope.wrappers.SVGElementInstance = SVGElementInstance;
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var setWrapper = scope.setWrapper;
-  var unsafeUnwrap = scope.unsafeUnwrap;
-  var unwrap = scope.unwrap;
-  var unwrapIfNeeded = scope.unwrapIfNeeded;
-  var wrap = scope.wrap;
-
-  var OriginalCanvasRenderingContext2D = window.CanvasRenderingContext2D;
-
-  function CanvasRenderingContext2D(impl) {
-    setWrapper(impl, this);
-  }
-
-  mixin(CanvasRenderingContext2D.prototype, {
-    get canvas() {
-      return wrap(unsafeUnwrap(this).canvas);
-    },
-
-    drawImage: function() {
-      arguments[0] = unwrapIfNeeded(arguments[0]);
-      unsafeUnwrap(this).drawImage.apply(unsafeUnwrap(this), arguments);
-    },
-
-    createPattern: function() {
-      arguments[0] = unwrap(arguments[0]);
-      return unsafeUnwrap(this).createPattern.apply(unsafeUnwrap(this), arguments);
-    }
-  });
-
-  registerWrapper(OriginalCanvasRenderingContext2D, CanvasRenderingContext2D,
-                  document.createElement('canvas').getContext('2d'));
-
-  scope.wrappers.CanvasRenderingContext2D = CanvasRenderingContext2D;
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var setWrapper = scope.setWrapper;
-  var unsafeUnwrap = scope.unsafeUnwrap;
-  var unwrapIfNeeded = scope.unwrapIfNeeded;
-  var wrap = scope.wrap;
-
-  var OriginalWebGLRenderingContext = window.WebGLRenderingContext;
-
-  // IE10 does not have WebGL.
-  if (!OriginalWebGLRenderingContext)
-    return;
-
-  function WebGLRenderingContext(impl) {
-    setWrapper(impl, this);
-  }
-
-  mixin(WebGLRenderingContext.prototype, {
-    get canvas() {
-      return wrap(unsafeUnwrap(this).canvas);
-    },
-
-    texImage2D: function() {
-      arguments[5] = unwrapIfNeeded(arguments[5]);
-      unsafeUnwrap(this).texImage2D.apply(unsafeUnwrap(this), arguments);
-    },
-
-    texSubImage2D: function() {
-      arguments[6] = unwrapIfNeeded(arguments[6]);
-      unsafeUnwrap(this).texSubImage2D.apply(unsafeUnwrap(this), arguments);
-    }
-  });
-
-  // Blink/WebKit has broken DOM bindings. Usually we would create an instance
-  // of the object and pass it into registerWrapper as a "blueprint" but
-  // creating WebGL contexts is expensive and might fail so we use a dummy
-  // object with dummy instance properties for these broken browsers.
-  var instanceProperties = /WebKit/.test(navigator.userAgent) ?
-      {drawingBufferHeight: null, drawingBufferWidth: null} : {};
-
-  registerWrapper(OriginalWebGLRenderingContext, WebGLRenderingContext,
-      instanceProperties);
-
-  scope.wrappers.WebGLRenderingContext = WebGLRenderingContext;
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var registerWrapper = scope.registerWrapper;
-  var setWrapper = scope.setWrapper;
-  var unsafeUnwrap = scope.unsafeUnwrap;
-  var unwrap = scope.unwrap;
-  var unwrapIfNeeded = scope.unwrapIfNeeded;
-  var wrap = scope.wrap;
-
-  var OriginalRange = window.Range;
-
-  function Range(impl) {
-    setWrapper(impl, this);
-  }
-  Range.prototype = {
-    get startContainer() {
-      return wrap(unsafeUnwrap(this).startContainer);
-    },
-    get endContainer() {
-      return wrap(unsafeUnwrap(this).endContainer);
-    },
-    get commonAncestorContainer() {
-      return wrap(unsafeUnwrap(this).commonAncestorContainer);
-    },
-    setStart: function(refNode,offset) {
-      unsafeUnwrap(this).setStart(unwrapIfNeeded(refNode), offset);
-    },
-    setEnd: function(refNode,offset) {
-      unsafeUnwrap(this).setEnd(unwrapIfNeeded(refNode), offset);
-    },
-    setStartBefore: function(refNode) {
-      unsafeUnwrap(this).setStartBefore(unwrapIfNeeded(refNode));
-    },
-    setStartAfter: function(refNode) {
-      unsafeUnwrap(this).setStartAfter(unwrapIfNeeded(refNode));
-    },
-    setEndBefore: function(refNode) {
-      unsafeUnwrap(this).setEndBefore(unwrapIfNeeded(refNode));
-    },
-    setEndAfter: function(refNode) {
-      unsafeUnwrap(this).setEndAfter(unwrapIfNeeded(refNode));
-    },
-    selectNode: function(refNode) {
-      unsafeUnwrap(this).selectNode(unwrapIfNeeded(refNode));
-    },
-    selectNodeContents: function(refNode) {
-      unsafeUnwrap(this).selectNodeContents(unwrapIfNeeded(refNode));
-    },
-    compareBoundaryPoints: function(how, sourceRange) {
-      return unsafeUnwrap(this).compareBoundaryPoints(how, unwrap(sourceRange));
-    },
-    extractContents: function() {
-      return wrap(unsafeUnwrap(this).extractContents());
-    },
-    cloneContents: function() {
-      return wrap(unsafeUnwrap(this).cloneContents());
-    },
-    insertNode: function(node) {
-      unsafeUnwrap(this).insertNode(unwrapIfNeeded(node));
-    },
-    surroundContents: function(newParent) {
-      unsafeUnwrap(this).surroundContents(unwrapIfNeeded(newParent));
-    },
-    cloneRange: function() {
-      return wrap(unsafeUnwrap(this).cloneRange());
-    },
-    isPointInRange: function(node, offset) {
-      return unsafeUnwrap(this).isPointInRange(unwrapIfNeeded(node), offset);
-    },
-    comparePoint: function(node, offset) {
-      return unsafeUnwrap(this).comparePoint(unwrapIfNeeded(node), offset);
-    },
-    intersectsNode: function(node) {
-      return unsafeUnwrap(this).intersectsNode(unwrapIfNeeded(node));
-    },
-    toString: function() {
-      return unsafeUnwrap(this).toString();
-    }
-  };
-
-  // IE9 does not have createContextualFragment.
-  if (OriginalRange.prototype.createContextualFragment) {
-    Range.prototype.createContextualFragment = function(html) {
-      return wrap(unsafeUnwrap(this).createContextualFragment(html));
-    };
-  }
-
-  registerWrapper(window.Range, Range, document.createRange());
-
-  scope.wrappers.Range = Range;
-
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var GetElementsByInterface = scope.GetElementsByInterface;
-  var ParentNodeInterface = scope.ParentNodeInterface;
-  var SelectorsInterface = scope.SelectorsInterface;
-  var mixin = scope.mixin;
-  var registerObject = scope.registerObject;
-
-  var DocumentFragment = registerObject(document.createDocumentFragment());
-  mixin(DocumentFragment.prototype, ParentNodeInterface);
-  mixin(DocumentFragment.prototype, SelectorsInterface);
-  mixin(DocumentFragment.prototype, GetElementsByInterface);
-
-  var Comment = registerObject(document.createComment(''));
-
-  scope.wrappers.Comment = Comment;
-  scope.wrappers.DocumentFragment = DocumentFragment;
-
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var DocumentFragment = scope.wrappers.DocumentFragment;
-  var TreeScope = scope.TreeScope;
-  var elementFromPoint = scope.elementFromPoint;
-  var getInnerHTML = scope.getInnerHTML;
-  var getTreeScope = scope.getTreeScope;
-  var mixin = scope.mixin;
-  var rewrap = scope.rewrap;
-  var setInnerHTML = scope.setInnerHTML;
-  var unsafeUnwrap = scope.unsafeUnwrap;
-  var unwrap = scope.unwrap;
-
-  var shadowHostTable = new WeakMap();
-  var nextOlderShadowTreeTable = new WeakMap();
-
-  var spaceCharRe = /[ \t\n\r\f]/;
-
-  function ShadowRoot(hostWrapper) {
-    var node = unwrap(unsafeUnwrap(hostWrapper).ownerDocument.createDocumentFragment());
-    DocumentFragment.call(this, node);
-
-    // createDocumentFragment associates the node with a wrapper
-    // DocumentFragment instance. Override that.
-    rewrap(node, this);
-
-    var oldShadowRoot = hostWrapper.shadowRoot;
-    nextOlderShadowTreeTable.set(this, oldShadowRoot);
-
-    this.treeScope_ =
-        new TreeScope(this, getTreeScope(oldShadowRoot || hostWrapper));
-
-    shadowHostTable.set(this, hostWrapper);
-  }
-  ShadowRoot.prototype = Object.create(DocumentFragment.prototype);
-  mixin(ShadowRoot.prototype, {
-    constructor: ShadowRoot,
-
-    get innerHTML() {
-      return getInnerHTML(this);
-    },
-    set innerHTML(value) {
-      setInnerHTML(this, value);
-      this.invalidateShadowRenderer();
-    },
-
-    get olderShadowRoot() {
-      return nextOlderShadowTreeTable.get(this) || null;
-    },
-
-    get host() {
-      return shadowHostTable.get(this) || null;
-    },
-
-    invalidateShadowRenderer: function() {
-      return shadowHostTable.get(this).invalidateShadowRenderer();
-    },
-
-    elementFromPoint: function(x, y) {
-      return elementFromPoint(this, this.ownerDocument, x, y);
-    },
-
-    getElementById: function(id) {
-      if (spaceCharRe.test(id))
-        return null;
-      return this.querySelector('[id="' + id + '"]');
-    }
-  });
-
-  scope.wrappers.ShadowRoot = ShadowRoot;
-
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var Element = scope.wrappers.Element;
-  var HTMLContentElement = scope.wrappers.HTMLContentElement;
-  var HTMLShadowElement = scope.wrappers.HTMLShadowElement;
-  var Node = scope.wrappers.Node;
-  var ShadowRoot = scope.wrappers.ShadowRoot;
-  var assert = scope.assert;
-  var getTreeScope = scope.getTreeScope;
-  var mixin = scope.mixin;
-  var oneOf = scope.oneOf;
-  var unsafeUnwrap = scope.unsafeUnwrap;
-  var unwrap = scope.unwrap;
-  var wrap = scope.wrap;
-
-  /**
-   * Updates the fields of a wrapper to a snapshot of the logical DOM as needed.
-   * Up means parentNode
-   * Sideways means previous and next sibling.
-   * @param {!Node} wrapper
-   */
-  function updateWrapperUpAndSideways(wrapper) {
-    wrapper.previousSibling_ = wrapper.previousSibling;
-    wrapper.nextSibling_ = wrapper.nextSibling;
-    wrapper.parentNode_ = wrapper.parentNode;
-  }
-
-  /**
-   * Updates the fields of a wrapper to a snapshot of the logical DOM as needed.
-   * Down means first and last child
-   * @param {!Node} wrapper
-   */
-  function updateWrapperDown(wrapper) {
-    wrapper.firstChild_ = wrapper.firstChild;
-    wrapper.lastChild_ = wrapper.lastChild;
-  }
-
-  function updateAllChildNodes(parentNodeWrapper) {
-    assert(parentNodeWrapper instanceof Node);
-    for (var childWrapper = parentNodeWrapper.firstChild;
-         childWrapper;
-         childWrapper = childWrapper.nextSibling) {
-      updateWrapperUpAndSideways(childWrapper);
-    }
-    updateWrapperDown(parentNodeWrapper);
-  }
-
-  function insertBefore(parentNodeWrapper, newChildWrapper, refChildWrapper) {
-    var parentNode = unwrap(parentNodeWrapper);
-    var newChild = unwrap(newChildWrapper);
-    var refChild = refChildWrapper ? unwrap(refChildWrapper) : null;
-
-    remove(newChildWrapper);
-    updateWrapperUpAndSideways(newChildWrapper);
-
-    if (!refChildWrapper) {
-      parentNodeWrapper.lastChild_ = parentNodeWrapper.lastChild;
-      if (parentNodeWrapper.lastChild === parentNodeWrapper.firstChild)
-        parentNodeWrapper.firstChild_ = parentNodeWrapper.firstChild;
-
-      var lastChildWrapper = wrap(parentNode.lastChild);
-      if (lastChildWrapper)
-        lastChildWrapper.nextSibling_ = lastChildWrapper.nextSibling;
-    } else {
-      if (parentNodeWrapper.firstChild === refChildWrapper)
-        parentNodeWrapper.firstChild_ = refChildWrapper;
-
-      refChildWrapper.previousSibling_ = refChildWrapper.previousSibling;
-    }
-
-    scope.originalInsertBefore.call(parentNode, newChild, refChild);
-  }
-
-  function remove(nodeWrapper) {
-    var node = unwrap(nodeWrapper)
-    var parentNode = node.parentNode;
-    if (!parentNode)
-      return;
-
-    var parentNodeWrapper = wrap(parentNode);
-    updateWrapperUpAndSideways(nodeWrapper);
-
-    if (nodeWrapper.previousSibling)
-      nodeWrapper.previousSibling.nextSibling_ = nodeWrapper;
-    if (nodeWrapper.nextSibling)
-      nodeWrapper.nextSibling.previousSibling_ = nodeWrapper;
-
-    if (parentNodeWrapper.lastChild === nodeWrapper)
-      parentNodeWrapper.lastChild_ = nodeWrapper;
-    if (parentNodeWrapper.firstChild === nodeWrapper)
-      parentNodeWrapper.firstChild_ = nodeWrapper;
-
-    scope.originalRemoveChild.call(parentNode, node);
-  }
-
-  var distributedNodesTable = new WeakMap();
-  var destinationInsertionPointsTable = new WeakMap();
-  var rendererForHostTable = new WeakMap();
-
-  function resetDistributedNodes(insertionPoint) {
-    distributedNodesTable.set(insertionPoint, []);
-  }
-
-  function getDistributedNodes(insertionPoint) {
-    var rv = distributedNodesTable.get(insertionPoint);
-    if (!rv)
-      distributedNodesTable.set(insertionPoint, rv = []);
-    return rv;
-  }
-
-  function getChildNodesSnapshot(node) {
-    var result = [], i = 0;
-    for (var child = node.firstChild; child; child = child.nextSibling) {
-      result[i++] = child;
-    }
-    return result;
-  }
-
-  var request = oneOf(window, [
-    'requestAnimationFrame',
-    'mozRequestAnimationFrame',
-    'webkitRequestAnimationFrame',
-    'setTimeout'
-  ]);
-
-  var pendingDirtyRenderers = [];
-  var renderTimer;
-
-  function renderAllPending() {
-    // TODO(arv): Order these in document order. That way we do not have to
-    // render something twice.
-    for (var i = 0; i < pendingDirtyRenderers.length; i++) {
-      var renderer = pendingDirtyRenderers[i];
-      var parentRenderer = renderer.parentRenderer;
-      if (parentRenderer && parentRenderer.dirty)
-        continue;
-      renderer.render();
-    }
-
-    pendingDirtyRenderers = [];
-  }
-
-  function handleRequestAnimationFrame() {
-    renderTimer = null;
-    renderAllPending();
-  }
-
-  /**
-   * Returns existing shadow renderer for a host or creates it if it is needed.
-   * @params {!Element} host
-   * @return {!ShadowRenderer}
-   */
-  function getRendererForHost(host) {
-    var renderer = rendererForHostTable.get(host);
-    if (!renderer) {
-      renderer = new ShadowRenderer(host);
-      rendererForHostTable.set(host, renderer);
-    }
-    return renderer;
-  }
-
-  function getShadowRootAncestor(node) {
-    var root = getTreeScope(node).root;
-    if (root instanceof ShadowRoot)
-      return root;
-    return null;
-  }
-
-  function getRendererForShadowRoot(shadowRoot) {
-    return getRendererForHost(shadowRoot.host);
-  }
-
-  var spliceDiff = new ArraySplice();
-  spliceDiff.equals = function(renderNode, rawNode) {
-    return unwrap(renderNode.node) === rawNode;
-  };
-
-  /**
-   * RenderNode is used as an in memory "render tree". When we render the
-   * composed tree we create a tree of RenderNodes, then we diff this against
-   * the real DOM tree and make minimal changes as needed.
-   */
-  function RenderNode(node) {
-    this.skip = false;
-    this.node = node;
-    this.childNodes = [];
-  }
-
-  RenderNode.prototype = {
-    append: function(node) {
-      var rv = new RenderNode(node);
-      this.childNodes.push(rv);
-      return rv;
-    },
-
-    sync: function(opt_added) {
-      if (this.skip)
-        return;
-
-      var nodeWrapper = this.node;
-      // plain array of RenderNodes
-      var newChildren = this.childNodes;
-      // plain array of real nodes.
-      var oldChildren = getChildNodesSnapshot(unwrap(nodeWrapper));
-      var added = opt_added || new WeakMap();
-
-      var splices = spliceDiff.calculateSplices(newChildren, oldChildren);
-
-      var newIndex = 0, oldIndex = 0;
-      var lastIndex = 0;
-      for (var i = 0; i < splices.length; i++) {
-        var splice = splices[i];
-        for (; lastIndex < splice.index; lastIndex++) {
-          oldIndex++;
-          newChildren[newIndex++].sync(added);
-        }
-
-        var removedCount = splice.removed.length;
-        for (var j = 0; j < removedCount; j++) {
-          var wrapper = wrap(oldChildren[oldIndex++]);
-          if (!added.get(wrapper))
-            remove(wrapper);
-        }
-
-        var addedCount = splice.addedCount;
-        var refNode = oldChildren[oldIndex] && wrap(oldChildren[oldIndex]);
-        for (var j = 0; j < addedCount; j++) {
-          var newChildRenderNode = newChildren[newIndex++];
-          var newChildWrapper = newChildRenderNode.node;
-          insertBefore(nodeWrapper, newChildWrapper, refNode);
-
-          // Keep track of added so that we do not remove the node after it
-          // has been added.
-          added.set(newChildWrapper, true);
-
-          newChildRenderNode.sync(added);
-        }
-
-        lastIndex += addedCount;
-      }
-
-      for (var i = lastIndex; i < newChildren.length; i++) {
-        newChildren[i].sync(added);
-      }
-    }
-  };
-
-  function ShadowRenderer(host) {
-    this.host = host;
-    this.dirty = false;
-    this.invalidateAttributes();
-    this.associateNode(host);
-  }
-
-  ShadowRenderer.prototype = {
-
-    // http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#rendering-shadow-trees
-    render: function(opt_renderNode) {
-      if (!this.dirty)
-        return;
-
-      this.invalidateAttributes();
-
-      var host = this.host;
-
-      this.distribution(host);
-      var renderNode = opt_renderNode || new RenderNode(host);
-      this.buildRenderTree(renderNode, host);
-
-      var topMostRenderer = !opt_renderNode;
-      if (topMostRenderer)
-        renderNode.sync();
-
-      this.dirty = false;
-    },
-
-    get parentRenderer() {
-      return getTreeScope(this.host).renderer;
-    },
-
-    invalidate: function() {
-      if (!this.dirty) {
-        this.dirty = true;
-        var parentRenderer = this.parentRenderer;
-        if (parentRenderer)
-          parentRenderer.invalidate();
-        pendingDirtyRenderers.push(this);
-        if (renderTimer)
-          return;
-        renderTimer = window[request](handleRequestAnimationFrame, 0);
-      }
-    },
-
-    // http://w3c.github.io/webcomponents/spec/shadow/#distribution-algorithms
-    distribution: function(root) {
-      this.resetAllSubtrees(root);
-      this.distributionResolution(root);
-    },
-
-    resetAll: function(node) {
-      if (isInsertionPoint(node))
-        resetDistributedNodes(node);
-      else
-        resetDestinationInsertionPoints(node);
-
-      this.resetAllSubtrees(node);
-    },
-
-    resetAllSubtrees: function(node) {
-      for (var child = node.firstChild; child; child = child.nextSibling) {
-        this.resetAll(child);
-      }
-
-      if (node.shadowRoot)
-        this.resetAll(node.shadowRoot);
-
-      if (node.olderShadowRoot)
-        this.resetAll(node.olderShadowRoot);
-    },
-
-    // http://w3c.github.io/webcomponents/spec/shadow/#distribution-results
-    distributionResolution: function(node) {
-      if (isShadowHost(node)) {
-        var shadowHost = node;
-        // 1.1
-        var pool = poolPopulation(shadowHost);
-
-        var shadowTrees = getShadowTrees(shadowHost);
-
-        // 1.2
-        for (var i = 0; i < shadowTrees.length; i++) {
-          // 1.2.1
-          this.poolDistribution(shadowTrees[i], pool);
-        }
-
-        // 1.3
-        for (var i = shadowTrees.length - 1; i >= 0; i--) {
-          var shadowTree = shadowTrees[i];
-
-          // 1.3.1
-          // TODO(arv): We should keep the shadow insertion points on the
-          // shadow root (or renderer) so we don't have to search the tree
-          // every time.
-          var shadow = getShadowInsertionPoint(shadowTree);
-
-          // 1.3.2
-          if (shadow) {
-
-            // 1.3.2.1
-            var olderShadowRoot = shadowTree.olderShadowRoot;
-            if (olderShadowRoot) {
-              // 1.3.2.1.1
-              pool = poolPopulation(olderShadowRoot);
-            }
-
-            // 1.3.2.2
-            for (var j = 0; j < pool.length; j++) {
-              // 1.3.2.2.1
-              destributeNodeInto(pool[j], shadow);
-            }
-          }
-
-          // 1.3.3
-          this.distributionResolution(shadowTree);
-        }
-      }
-
-      for (var child = node.firstChild; child; child = child.nextSibling) {
-        this.distributionResolution(child);
-      }
-    },
-
-    // http://w3c.github.io/webcomponents/spec/shadow/#dfn-pool-distribution-algorithm
-    poolDistribution: function (node, pool) {
-      if (node instanceof HTMLShadowElement)
-        return;
-
-      if (node instanceof HTMLContentElement) {
-        var content = node;
-        this.updateDependentAttributes(content.getAttribute('select'));
-
-        var anyDistributed = false;
-
-        // 1.1
-        for (var i = 0; i < pool.length; i++) {
-          var node = pool[i];
-          if (!node)
-            continue;
-          if (matches(node, content)) {
-            destributeNodeInto(node, content);
-            pool[i] = undefined;
-            anyDistributed = true;
-          }
-        }
-
-        // 1.2
-        // Fallback content
-        if (!anyDistributed) {
-          for (var child = content.firstChild;
-               child;
-               child = child.nextSibling) {
-            destributeNodeInto(child, content);
-          }
-        }
-
-        return;
-      }
-
-      for (var child = node.firstChild; child; child = child.nextSibling) {
-        this.poolDistribution(child, pool);
-      }
-    },
-
-    buildRenderTree: function(renderNode, node) {
-      var children = this.compose(node);
-      for (var i = 0; i < children.length; i++) {
-        var child = children[i];
-        var childRenderNode = renderNode.append(child);
-        this.buildRenderTree(childRenderNode, child);
-      }
-
-      if (isShadowHost(node)) {
-        var renderer = getRendererForHost(node);
-        renderer.dirty = false;
-      }
-
-    },
-
-    compose: function(node) {
-      var children = [];
-      var p = node.shadowRoot || node;
-      for (var child = p.firstChild; child; child = child.nextSibling) {
-        if (isInsertionPoint(child)) {
-          this.associateNode(p);
-          var distributedNodes = getDistributedNodes(child);
-          for (var j = 0; j < distributedNodes.length; j++) {
-            var distributedNode = distributedNodes[j];
-            if (isFinalDestination(child, distributedNode))
-              children.push(distributedNode);
-          }
-        } else {
-          children.push(child);
-        }
-      }
-      return children;
-    },
-
-    /**
-     * Invalidates the attributes used to keep track of which attributes may
-     * cause the renderer to be invalidated.
-     */
-    invalidateAttributes: function() {
-      this.attributes = Object.create(null);
-    },
-
-    /**
-     * Parses the selector and makes this renderer dependent on the attribute
-     * being used in the selector.
-     * @param {string} selector
-     */
-    updateDependentAttributes: function(selector) {
-      if (!selector)
-        return;
-
-      var attributes = this.attributes;
-
-      // .class
-      if (/\.\w+/.test(selector))
-        attributes['class'] = true;
-
-      // #id
-      if (/#\w+/.test(selector))
-        attributes['id'] = true;
-
-      selector.replace(/\[\s*([^\s=\|~\]]+)/g, function(_, name) {
-        attributes[name] = true;
-      });
-
-      // Pseudo selectors have been removed from the spec.
-    },
-
-    dependsOnAttribute: function(name) {
-      return this.attributes[name];
-    },
-
-    associateNode: function(node) {
-      unsafeUnwrap(node).polymerShadowRenderer_ = this;
-    }
-  };
-
-  // http://w3c.github.io/webcomponents/spec/shadow/#dfn-pool-population-algorithm
-  function poolPopulation(node) {
-    var pool = [];
-    for (var child = node.firstChild; child; child = child.nextSibling) {
-      if (isInsertionPoint(child)) {
-        pool.push.apply(pool, getDistributedNodes(child));
-      } else {
-        pool.push(child);
-      }
-    }
-    return pool;
-  }
-
-  function getShadowInsertionPoint(node) {
-    if (node instanceof HTMLShadowElement)
-      return node;
-    if (node instanceof HTMLContentElement)
-      return null;
-    for (var child = node.firstChild; child; child = child.nextSibling) {
-      var res = getShadowInsertionPoint(child);
-      if (res)
-        return res;
-    }
-    return null;
-  }
-
-  function destributeNodeInto(child, insertionPoint) {
-    getDistributedNodes(insertionPoint).push(child);
-    var points = destinationInsertionPointsTable.get(child);
-    if (!points)
-      destinationInsertionPointsTable.set(child, [insertionPoint]);
-    else
-      points.push(insertionPoint);
-  }
-
-  function getDestinationInsertionPoints(node) {
-    return destinationInsertionPointsTable.get(node);
-  }
-
-  function resetDestinationInsertionPoints(node) {
-    // IE11 crashes when delete is used.
-    destinationInsertionPointsTable.set(node, undefined);
-  }
-
-  // AllowedSelectors :
-  //   TypeSelector
-  //   *
-  //   ClassSelector
-  //   IDSelector
-  //   AttributeSelector
-  //   negation
-  var selectorStartCharRe = /^(:not\()?[*.#[a-zA-Z_|]/;
-
-  function matches(node, contentElement) {
-    var select = contentElement.getAttribute('select');
-    if (!select)
-      return true;
-
-    // Here we know the select attribute is a non empty string.
-    select = select.trim();
-    if (!select)
-      return true;
-
-    if (!(node instanceof Element))
-      return false;
-
-    if (!selectorStartCharRe.test(select))
-      return false;
-
-    try {
-      return node.matches(select);
-    } catch (ex) {
-      // Invalid selector.
-      return false;
-    }
-  }
-
-  function isFinalDestination(insertionPoint, node) {
-    var points = getDestinationInsertionPoints(node);
-    return points && points[points.length - 1] === insertionPoint;
-  }
-
-  function isInsertionPoint(node) {
-    return node instanceof HTMLContentElement ||
-           node instanceof HTMLShadowElement;
-  }
-
-  function isShadowHost(shadowHost) {
-    return shadowHost.shadowRoot;
-  }
-
-  // Returns the shadow trees as an array, with the youngest tree at the
-  // beginning of the array.
-  function getShadowTrees(host) {
-    var trees = [];
-
-    for (var tree = host.shadowRoot; tree; tree = tree.olderShadowRoot) {
-      trees.push(tree);
-    }
-    return trees;
-  }
-
-  function render(host) {
-    new ShadowRenderer(host).render();
-  };
-
-  // Need to rerender shadow host when:
-  //
-  // - a direct child to the ShadowRoot is added or removed
-  // - a direct child to the host is added or removed
-  // - a new shadow root is created
-  // - a direct child to a content/shadow element is added or removed
-  // - a sibling to a content/shadow element is added or removed
-  // - content[select] is changed
-  // - an attribute in a direct child to a host is modified
-
-  /**
-   * This gets called when a node was added or removed to it.
-   */
-  Node.prototype.invalidateShadowRenderer = function(force) {
-    var renderer = unsafeUnwrap(this).polymerShadowRenderer_;
-    if (renderer) {
-      renderer.invalidate();
-      return true;
-    }
-
-    return false;
-  };
-
-  HTMLContentElement.prototype.getDistributedNodes =
-  HTMLShadowElement.prototype.getDistributedNodes = function() {
-    // TODO(arv): We should only rerender the dirty ancestor renderers (from
-    // the root and down).
-    renderAllPending();
-    return getDistributedNodes(this);
-  };
-
-  Element.prototype.getDestinationInsertionPoints = function() {
-    renderAllPending();
-    return getDestinationInsertionPoints(this) || [];
-  };
-
-  HTMLContentElement.prototype.nodeIsInserted_ =
-  HTMLShadowElement.prototype.nodeIsInserted_ = function() {
-    // Invalidate old renderer if any.
-    this.invalidateShadowRenderer();
-
-    var shadowRoot = getShadowRootAncestor(this);
-    var renderer;
-    if (shadowRoot)
-      renderer = getRendererForShadowRoot(shadowRoot);
-    unsafeUnwrap(this).polymerShadowRenderer_ = renderer;
-    if (renderer)
-      renderer.invalidate();
-  };
-
-  scope.getRendererForHost = getRendererForHost;
-  scope.getShadowTrees = getShadowTrees;
-  scope.renderAllPending = renderAllPending;
-
-  scope.getDestinationInsertionPoints = getDestinationInsertionPoints;
-
-  // Exposed for testing
-  scope.visual = {
-    insertBefore: insertBefore,
-    remove: remove,
-  };
-
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var HTMLElement = scope.wrappers.HTMLElement;
-  var assert = scope.assert;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var unwrap = scope.unwrap;
-  var wrap = scope.wrap;
-
-  var elementsWithFormProperty = [
-    'HTMLButtonElement',
-    'HTMLFieldSetElement',
-    'HTMLInputElement',
-    'HTMLKeygenElement',
-    'HTMLLabelElement',
-    'HTMLLegendElement',
-    'HTMLObjectElement',
-    // HTMLOptionElement is handled in HTMLOptionElement.js
-    'HTMLOutputElement',
-    // HTMLSelectElement is handled in HTMLSelectElement.js
-    'HTMLTextAreaElement',
-  ];
-
-  function createWrapperConstructor(name) {
-    if (!window[name])
-      return;
-
-    // Ensure we are not overriding an already existing constructor.
-    assert(!scope.wrappers[name]);
-
-    var GeneratedWrapper = function(node) {
-      // At this point all of them extend HTMLElement.
-      HTMLElement.call(this, node);
-    }
-    GeneratedWrapper.prototype = Object.create(HTMLElement.prototype);
-    mixin(GeneratedWrapper.prototype, {
-      get form() {
-        return wrap(unwrap(this).form);
-      },
-    });
-
-    registerWrapper(window[name], GeneratedWrapper,
-        document.createElement(name.slice(4, -7)));
-    scope.wrappers[name] = GeneratedWrapper;
-  }
-
-  elementsWithFormProperty.forEach(createWrapperConstructor);
-
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2014 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var registerWrapper = scope.registerWrapper;
-  var setWrapper = scope.setWrapper;
-  var unsafeUnwrap = scope.unsafeUnwrap;
-  var unwrap = scope.unwrap;
-  var unwrapIfNeeded = scope.unwrapIfNeeded;
-  var wrap = scope.wrap;
-
-  var OriginalSelection = window.Selection;
-
-  function Selection(impl) {
-    setWrapper(impl, this);
-  }
-  Selection.prototype = {
-    get anchorNode() {
-      return wrap(unsafeUnwrap(this).anchorNode);
-    },
-    get focusNode() {
-      return wrap(unsafeUnwrap(this).focusNode);
-    },
-    addRange: function(range) {
-      unsafeUnwrap(this).addRange(unwrap(range));
-    },
-    collapse: function(node, index) {
-      unsafeUnwrap(this).collapse(unwrapIfNeeded(node), index);
-    },
-    containsNode: function(node, allowPartial) {
-      return unsafeUnwrap(this).containsNode(unwrapIfNeeded(node), allowPartial);
-    },
-    extend: function(node, offset) {
-      unsafeUnwrap(this).extend(unwrapIfNeeded(node), offset);
-    },
-    getRangeAt: function(index) {
-      return wrap(unsafeUnwrap(this).getRangeAt(index));
-    },
-    removeRange: function(range) {
-      unsafeUnwrap(this).removeRange(unwrap(range));
-    },
-    selectAllChildren: function(node) {
-      unsafeUnwrap(this).selectAllChildren(unwrapIfNeeded(node));
-    },
-    toString: function() {
-      return unsafeUnwrap(this).toString();
-    }
-  };
-
-  // WebKit extensions. Not implemented.
-  // readonly attribute Node baseNode;
-  // readonly attribute long baseOffset;
-  // readonly attribute Node extentNode;
-  // readonly attribute long extentOffset;
-  // [RaisesException] void setBaseAndExtent([Default=Undefined] optional Node baseNode,
-  //                       [Default=Undefined] optional long baseOffset,
-  //                       [Default=Undefined] optional Node extentNode,
-  //                       [Default=Undefined] optional long extentOffset);
-  // [RaisesException, ImplementedAs=collapse] void setPosition([Default=Undefined] optional Node node,
-  //                  [Default=Undefined] optional long offset);
-
-  registerWrapper(window.Selection, Selection, window.getSelection());
-
-  scope.wrappers.Selection = Selection;
-
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var GetElementsByInterface = scope.GetElementsByInterface;
-  var Node = scope.wrappers.Node;
-  var ParentNodeInterface = scope.ParentNodeInterface;
-  var Selection = scope.wrappers.Selection;
-  var SelectorsInterface = scope.SelectorsInterface;
-  var ShadowRoot = scope.wrappers.ShadowRoot;
-  var TreeScope = scope.TreeScope;
-  var cloneNode = scope.cloneNode;
-  var defineWrapGetter = scope.defineWrapGetter;
-  var elementFromPoint = scope.elementFromPoint;
-  var forwardMethodsToWrapper = scope.forwardMethodsToWrapper;
-  var matchesNames = scope.matchesNames;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var renderAllPending = scope.renderAllPending;
-  var rewrap = scope.rewrap;
-  var setWrapper = scope.setWrapper;
-  var unsafeUnwrap = scope.unsafeUnwrap;
-  var unwrap = scope.unwrap;
-  var wrap = scope.wrap;
-  var wrapEventTargetMethods = scope.wrapEventTargetMethods;
-  var wrapNodeList = scope.wrapNodeList;
-
-  var implementationTable = new WeakMap();
-
-  function Document(node) {
-    Node.call(this, node);
-    this.treeScope_ = new TreeScope(this, null);
-  }
-  Document.prototype = Object.create(Node.prototype);
-
-  defineWrapGetter(Document, 'documentElement');
-
-  // Conceptually both body and head can be in a shadow but suporting that seems
-  // overkill at this point.
-  defineWrapGetter(Document, 'body');
-  defineWrapGetter(Document, 'head');
-
-  // document cannot be overridden so we override a bunch of its methods
-  // directly on the instance.
-
-  function wrapMethod(name) {
-    var original = document[name];
-    Document.prototype[name] = function() {
-      return wrap(original.apply(unsafeUnwrap(this), arguments));
-    };
-  }
-
-  [
-    'createComment',
-    'createDocumentFragment',
-    'createElement',
-    'createElementNS',
-    'createEvent',
-    'createEventNS',
-    'createRange',
-    'createTextNode',
-    'getElementById'
-  ].forEach(wrapMethod);
-
-  var originalAdoptNode = document.adoptNode;
-
-  function adoptNodeNoRemove(node, doc) {
-    originalAdoptNode.call(unsafeUnwrap(doc), unwrap(node));
-    adoptSubtree(node, doc);
-  }
-
-  function adoptSubtree(node, doc) {
-    if (node.shadowRoot)
-      doc.adoptNode(node.shadowRoot);
-    if (node instanceof ShadowRoot)
-      adoptOlderShadowRoots(node, doc);
-    for (var child = node.firstChild; child; child = child.nextSibling) {
-      adoptSubtree(child, doc);
-    }
-  }
-
-  function adoptOlderShadowRoots(shadowRoot, doc) {
-    var oldShadowRoot = shadowRoot.olderShadowRoot;
-    if (oldShadowRoot)
-      doc.adoptNode(oldShadowRoot);
-  }
-
-  var originalGetSelection = document.getSelection;
-
-  mixin(Document.prototype, {
-    adoptNode: function(node) {
-      if (node.parentNode)
-        node.parentNode.removeChild(node);
-      adoptNodeNoRemove(node, this);
-      return node;
-    },
-    elementFromPoint: function(x, y) {
-      return elementFromPoint(this, this, x, y);
-    },
-    importNode: function(node, deep) {
-      return cloneNode(node, deep, unsafeUnwrap(this));
-    },
-    getSelection: function() {
-      renderAllPending();
-      return new Selection(originalGetSelection.call(unwrap(this)));
-    },
-    getElementsByName: function(name) {
-      return SelectorsInterface.querySelectorAll.call(this,
-          '[name=' + JSON.stringify(String(name)) + ']');
-    }
-  });
-
-  if (document.registerElement) {
-    var originalRegisterElement = document.registerElement;
-    Document.prototype.registerElement = function(tagName, object) {
-      var prototype, extendsOption;
-      if (object !== undefined) {
-        prototype = object.prototype;
-        extendsOption = object.extends;
-      }
-
-      if (!prototype)
-        prototype = Object.create(HTMLElement.prototype);
-
-
-      // If we already used the object as a prototype for another custom
-      // element.
-      if (scope.nativePrototypeTable.get(prototype)) {
-        // TODO(arv): DOMException
-        throw new Error('NotSupportedError');
-      }
-
-      // Find first object on the prototype chain that already have a native
-      // prototype. Keep track of all the objects before that so we can create
-      // a similar structure for the native case.
-      var proto = Object.getPrototypeOf(prototype);
-      var nativePrototype;
-      var prototypes = [];
-      while (proto) {
-        nativePrototype = scope.nativePrototypeTable.get(proto);
-        if (nativePrototype)
-          break;
-        prototypes.push(proto);
-        proto = Object.getPrototypeOf(proto);
-      }
-
-      if (!nativePrototype) {
-        // TODO(arv): DOMException
-        throw new Error('NotSupportedError');
-      }
-
-      // This works by creating a new prototype object that is empty, but has
-      // the native prototype as its proto. The original prototype object
-      // passed into register is used as the wrapper prototype.
-
-      var newPrototype = Object.create(nativePrototype);
-      for (var i = prototypes.length - 1; i >= 0; i--) {
-        newPrototype = Object.create(newPrototype);
-      }
-
-      // Add callbacks if present.
-      // Names are taken from:
-      //   https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/bindings/v8/CustomElementConstructorBuilder.cpp&sq=package:chromium&type=cs&l=156
-      // and not from the spec since the spec is out of date.
-      [
-        'createdCallback',
-        'attachedCallback',
-        'detachedCallback',
-        'attributeChangedCallback',
-      ].forEach(function(name) {
-        var f = prototype[name];
-        if (!f)
-          return;
-        newPrototype[name] = function() {
-          // if this element has been wrapped prior to registration,
-          // the wrapper is stale; in this case rewrap
-          if (!(wrap(this) instanceof CustomElementConstructor)) {
-            rewrap(this);
-          }
-          f.apply(wrap(this), arguments);
-        };
-      });
-
-      var p = {prototype: newPrototype};
-      if (extendsOption)
-        p.extends = extendsOption;
-
-      function CustomElementConstructor(node) {
-        if (!node) {
-          if (extendsOption) {
-            return document.createElement(extendsOption, tagName);
-          } else {
-            return document.createElement(tagName);
-          }
-        }
-        setWrapper(node, this);
-      }
-      CustomElementConstructor.prototype = prototype;
-      CustomElementConstructor.prototype.constructor = CustomElementConstructor;
-
-      scope.constructorTable.set(newPrototype, CustomElementConstructor);
-      scope.nativePrototypeTable.set(prototype, newPrototype);
-
-      // registration is synchronous so do it last
-      var nativeConstructor = originalRegisterElement.call(unwrap(this),
-          tagName, p);
-      return CustomElementConstructor;
-    };
-
-    forwardMethodsToWrapper([
-      window.HTMLDocument || window.Document,  // Gecko adds these to HTMLDocument
-    ], [
-      'registerElement',
-    ]);
-  }
-
-  // We also override some of the methods on document.body and document.head
-  // for convenience.
-  forwardMethodsToWrapper([
-    window.HTMLBodyElement,
-    window.HTMLDocument || window.Document,  // Gecko adds these to HTMLDocument
-    window.HTMLHeadElement,
-    window.HTMLHtmlElement,
-  ], [
-    'appendChild',
-    'compareDocumentPosition',
-    'contains',
-    'getElementsByClassName',
-    'getElementsByTagName',
-    'getElementsByTagNameNS',
-    'insertBefore',
-    'querySelector',
-    'querySelectorAll',
-    'removeChild',
-    'replaceChild',
-  ].concat(matchesNames));
-
-  forwardMethodsToWrapper([
-    window.HTMLDocument || window.Document,  // Gecko adds these to HTMLDocument
-  ], [
-    'adoptNode',
-    'importNode',
-    'contains',
-    'createComment',
-    'createDocumentFragment',
-    'createElement',
-    'createElementNS',
-    'createEvent',
-    'createEventNS',
-    'createRange',
-    'createTextNode',
-    'elementFromPoint',
-    'getElementById',
-    'getElementsByName',
-    'getSelection',
-  ]);
-
-  mixin(Document.prototype, GetElementsByInterface);
-  mixin(Document.prototype, ParentNodeInterface);
-  mixin(Document.prototype, SelectorsInterface);
-
-  mixin(Document.prototype, {
-    get implementation() {
-      var implementation = implementationTable.get(this);
-      if (implementation)
-        return implementation;
-      implementation =
-          new DOMImplementation(unwrap(this).implementation);
-      implementationTable.set(this, implementation);
-      return implementation;
-    },
-
-    get defaultView() {
-      return wrap(unwrap(this).defaultView);
-    }
-  });
-
-  registerWrapper(window.Document, Document,
-      document.implementation.createHTMLDocument(''));
-
-  // Both WebKit and Gecko uses HTMLDocument for document. HTML5/DOM only has
-  // one Document interface and IE implements the standard correctly.
-  if (window.HTMLDocument)
-    registerWrapper(window.HTMLDocument, Document);
-
-  wrapEventTargetMethods([
-    window.HTMLBodyElement,
-    window.HTMLDocument || window.Document,  // Gecko adds these to HTMLDocument
-    window.HTMLHeadElement,
-  ]);
-
-  function DOMImplementation(impl) {
-    setWrapper(impl, this);
-  }
-
-  function wrapImplMethod(constructor, name) {
-    var original = document.implementation[name];
-    constructor.prototype[name] = function() {
-      return wrap(original.apply(unsafeUnwrap(this), arguments));
-    };
-  }
-
-  function forwardImplMethod(constructor, name) {
-    var original = document.implementation[name];
-    constructor.prototype[name] = function() {
-      return original.apply(unsafeUnwrap(this), arguments);
-    };
-  }
-
-  wrapImplMethod(DOMImplementation, 'createDocumentType');
-  wrapImplMethod(DOMImplementation, 'createDocument');
-  wrapImplMethod(DOMImplementation, 'createHTMLDocument');
-  forwardImplMethod(DOMImplementation, 'hasFeature');
-
-  registerWrapper(window.DOMImplementation, DOMImplementation);
-
-  forwardMethodsToWrapper([
-    window.DOMImplementation,
-  ], [
-    'createDocumentType',
-    'createDocument',
-    'createHTMLDocument',
-    'hasFeature',
-  ]);
-
-  scope.adoptNodeNoRemove = adoptNodeNoRemove;
-  scope.wrappers.DOMImplementation = DOMImplementation;
-  scope.wrappers.Document = Document;
-
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var EventTarget = scope.wrappers.EventTarget;
-  var Selection = scope.wrappers.Selection;
-  var mixin = scope.mixin;
-  var registerWrapper = scope.registerWrapper;
-  var renderAllPending = scope.renderAllPending;
-  var unwrap = scope.unwrap;
-  var unwrapIfNeeded = scope.unwrapIfNeeded;
-  var wrap = scope.wrap;
-
-  var OriginalWindow = window.Window;
-  var originalGetComputedStyle = window.getComputedStyle;
-  var originalGetDefaultComputedStyle = window.getDefaultComputedStyle;
-  var originalGetSelection = window.getSelection;
-
-  function Window(impl) {
-    EventTarget.call(this, impl);
-  }
-  Window.prototype = Object.create(EventTarget.prototype);
-
-  OriginalWindow.prototype.getComputedStyle = function(el, pseudo) {
-    return wrap(this || window).getComputedStyle(unwrapIfNeeded(el), pseudo);
-  };
-
-  // Mozilla proprietary extension.
-  if (originalGetDefaultComputedStyle) {
-    OriginalWindow.prototype.getDefaultComputedStyle = function(el, pseudo) {
-      return wrap(this || window).getDefaultComputedStyle(
-          unwrapIfNeeded(el), pseudo);
-    };
-  }
-
-  OriginalWindow.prototype.getSelection = function() {
-    return wrap(this || window).getSelection();
-  };
-
-  // Work around for https://bugzilla.mozilla.org/show_bug.cgi?id=943065
-  delete window.getComputedStyle;
-  delete window.getDefaultComputedStyle;
-  delete window.getSelection;
-
-  ['addEventListener', 'removeEventListener', 'dispatchEvent'].forEach(
-      function(name) {
-        OriginalWindow.prototype[name] = function() {
-          var w = wrap(this || window);
-          return w[name].apply(w, arguments);
-        };
-
-        // Work around for https://bugzilla.mozilla.org/show_bug.cgi?id=943065
-        delete window[name];
-      });
-
-  mixin(Window.prototype, {
-    getComputedStyle: function(el, pseudo) {
-      renderAllPending();
-      return originalGetComputedStyle.call(unwrap(this), unwrapIfNeeded(el),
-                                           pseudo);
-    },
-    getSelection: function() {
-      renderAllPending();
-      return new Selection(originalGetSelection.call(unwrap(this)));
-    },
-
-    get document() {
-      return wrap(unwrap(this).document);
-    }
-  });
-
-  // Mozilla proprietary extension.
-  if (originalGetDefaultComputedStyle) {
-    Window.prototype.getDefaultComputedStyle = function(el, pseudo) {
-      renderAllPending();
-      return originalGetDefaultComputedStyle.call(unwrap(this),
-          unwrapIfNeeded(el),pseudo);
-    };
-  }
-
-  registerWrapper(OriginalWindow, Window, window);
-
-  scope.wrappers.Window = Window;
-
-})(window.ShadowDOMPolyfill);
-
-/**
- * Copyright 2014 The Polymer Authors. All rights reserved.
- * Use of this source code is goverened by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
-(function(scope) {
-  'use strict';
-
-  var unwrap = scope.unwrap;
-
-  // DataTransfer (Clipboard in old Blink/WebKit) has a single method that
-  // requires wrapping. Since it is only a method we do not need a real wrapper,
-  // we can just override the method.
-
-  var OriginalDataTransfer = window.DataTransfer || window.Clipboard;
-  var OriginalDataTransferSetDragImage =
-      OriginalDataTransfer.prototype.setDragImage;
-
-  if (OriginalDataTransferSetDragImage) {
-    OriginalDataTransfer.prototype.setDragImage = function(image, x, y) {
-      OriginalDataTransferSetDragImage.call(this, unwrap(image), x, y);
-    };
-  }
-
-})(window.ShadowDOMPolyfill);
-
-/**
- * Copyright 2014 The Polymer Authors. All rights reserved.
- * Use of this source code is goverened by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
-(function(scope) {
-  'use strict';
-
-  var registerWrapper = scope.registerWrapper;
-  var setWrapper = scope.setWrapper;
-  var unwrap = scope.unwrap;
-
-  var OriginalFormData = window.FormData;
-  if (!OriginalFormData) return;
-
-  function FormData(formElement) {
-    var impl;
-    if (formElement instanceof OriginalFormData) {
-      impl = formElement;
-    } else {
-      impl = new OriginalFormData(formElement && unwrap(formElement));
-    }
-    setWrapper(impl, this);
-  }
-
-  registerWrapper(OriginalFormData, FormData, new OriginalFormData());
-
-  scope.wrappers.FormData = FormData;
-
-})(window.ShadowDOMPolyfill);
-
-/*
- * Copyright 2014 The Polymer Authors. All rights reserved.
- * Use of this source code is goverened by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
-(function(scope) {
-  'use strict';
-
-  var unwrapIfNeeded = scope.unwrapIfNeeded;
-  var originalSend = XMLHttpRequest.prototype.send;
-
-  // Since we only need to adjust XHR.send, we just patch it instead of wrapping
-  // the entire object. This happens when FormData is passed.
-  XMLHttpRequest.prototype.send = function(obj) {
-    return originalSend.call(this, unwrapIfNeeded(obj));
-  };
-
-})(window.ShadowDOMPolyfill);
-
-// Copyright 2013 The Polymer Authors. All rights reserved.
-// Use of this source code is goverened by a BSD-style
-// license that can be found in the LICENSE file.
-
-(function(scope) {
-  'use strict';
-
-  var isWrapperFor = scope.isWrapperFor;
-
-  // This is a list of the elements we currently override the global constructor
-  // for.
-  var elements = {
-    'a': 'HTMLAnchorElement',
-    // Do not create an applet element by default since it shows a warning in
-    // IE.
-    // https://github.com/Polymer/polymer/issues/217
-    // 'applet': 'HTMLAppletElement',
-    'area': 'HTMLAreaElement',
-    'audio': 'HTMLAudioElement',
-    'base': 'HTMLBaseElement',
-    'body': 'HTMLBodyElement',
-    'br': 'HTMLBRElement',
-    'button': 'HTMLButtonElement',
-    'canvas': 'HTMLCanvasElement',
-    'caption': 'HTMLTableCaptionElement',
-    'col': 'HTMLTableColElement',
-    // 'command': 'HTMLCommandElement',  // Not fully implemented in Gecko.
-    'content': 'HTMLContentElement',
-    'data': 'HTMLDataElement',
-    'datalist': 'HTMLDataListElement',
-    'del': 'HTMLModElement',
-    'dir': 'HTMLDirectoryElement',
-    'div': 'HTMLDivElement',
-    'dl': 'HTMLDListElement',
-    'embed': 'HTMLEmbedElement',
-    'fieldset': 'HTMLFieldSetElement',
-    'font': 'HTMLFontElement',
-    'form': 'HTMLFormElement',
-    'frame': 'HTMLFrameElement',
-    'frameset': 'HTMLFrameSetElement',
-    'h1': 'HTMLHeadingElement',
-    'head': 'HTMLHeadElement',
-    'hr': 'HTMLHRElement',
-    'html': 'HTMLHtmlElement',
-    'iframe': 'HTMLIFrameElement',
-    'img': 'HTMLImageElement',
-    'input': 'HTMLInputElement',
-    'keygen': 'HTMLKeygenElement',
-    'label': 'HTMLLabelElement',
-    'legend': 'HTMLLegendElement',
-    'li': 'HTMLLIElement',
-    'link': 'HTMLLinkElement',
-    'map': 'HTMLMapElement',
-    'marquee': 'HTMLMarqueeElement',
-    'menu': 'HTMLMenuElement',
-    'menuitem': 'HTMLMenuItemElement',
-    'meta': 'HTMLMetaElement',
-    'meter': 'HTMLMeterElement',
-    'object': 'HTMLObjectElement',
-    'ol': 'HTMLOListElement',
-    'optgroup': 'HTMLOptGroupElement',
-    'option': 'HTMLOptionElement',
-    'output': 'HTMLOutputElement',
-    'p': 'HTMLParagraphElement',
-    'param': 'HTMLParamElement',
-    'pre': 'HTMLPreElement',
-    'progress': 'HTMLProgressElement',
-    'q': 'HTMLQuoteElement',
-    'script': 'HTMLScriptElement',
-    'select': 'HTMLSelectElement',
-    'shadow': 'HTMLShadowElement',
-    'source': 'HTMLSourceElement',
-    'span': 'HTMLSpanElement',
-    'style': 'HTMLStyleElement',
-    'table': 'HTMLTableElement',
-    'tbody': 'HTMLTableSectionElement',
-    // WebKit and Moz are wrong:
-    // https://bugs.webkit.org/show_bug.cgi?id=111469
-    // https://bugzilla.mozilla.org/show_bug.cgi?id=848096
-    // 'td': 'HTMLTableCellElement',
-    'template': 'HTMLTemplateElement',
-    'textarea': 'HTMLTextAreaElement',
-    'thead': 'HTMLTableSectionElement',
-    'time': 'HTMLTimeElement',
-    'title': 'HTMLTitleElement',
-    'tr': 'HTMLTableRowElement',
-    'track': 'HTMLTrackElement',
-    'ul': 'HTMLUListElement',
-    'video': 'HTMLVideoElement',
-  };
-
-  function overrideConstructor(tagName) {
-    var nativeConstructorName = elements[tagName];
-    var nativeConstructor = window[nativeConstructorName];
-    if (!nativeConstructor)
-      return;
-    var element = document.createElement(tagName);
-    var wrapperConstructor = element.constructor;
-    window[nativeConstructorName] = wrapperConstructor;
-  }
-
-  Object.keys(elements).forEach(overrideConstructor);
-
-  Object.getOwnPropertyNames(scope.wrappers).forEach(function(name) {
-    window[name] = scope.wrappers[name]
-  });
-
-})(window.ShadowDOMPolyfill);
-
-/*
- * 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(scope) {
-
-  // convenient global
-  window.wrap = ShadowDOMPolyfill.wrapIfNeeded;
-  window.unwrap = ShadowDOMPolyfill.unwrapIfNeeded;
-
-  // users may want to customize other types
-  // TODO(sjmiles): 'button' is now supported by ShadowDOMPolyfill, but
-  // I've left this code here in case we need to temporarily patch another
-  // type
-  /*
-  (function() {
-    var elts = {HTMLButtonElement: 'button'};
-    for (var c in elts) {
-      window[c] = function() { throw 'Patched Constructor'; };
-      window[c].prototype = Object.getPrototypeOf(
-          document.createElement(elts[c]));
-    }
-  })();
-  */
-
-  // patch in prefixed name
-  Object.defineProperty(Element.prototype, 'webkitShadowRoot',
-      Object.getOwnPropertyDescriptor(Element.prototype, 'shadowRoot'));
-
-  var originalCreateShadowRoot = Element.prototype.createShadowRoot;
-  Element.prototype.createShadowRoot = function() {
-    var root = originalCreateShadowRoot.call(this);
-    CustomElements.watchShadow(this);
-    return root;
-  };
-
-  Element.prototype.webkitCreateShadowRoot = Element.prototype.createShadowRoot;
-
-  function queryShadow(node, selector) {
-    var m, el = node.firstElementChild;
-    var shadows, sr, i;
-    shadows = [];
-    sr = node.shadowRoot;
-    while(sr) {
-      shadows.push(sr);
-      sr = sr.olderShadowRoot;
-    }
-    for(i = shadows.length - 1; i >= 0; i--) {
-      m = shadows[i].querySelector(selector);
-      if (m) {
-        return m;
-      }
-    }
-    while(el) {
-      m = queryShadow(el, selector);
-      if (m) {
-        return m;
-      }
-      el = el.nextElementSibling;
-    }
-    return null;
-  }
-
-  function queryAllShadows(node, selector, results) {
-    var el = node.firstElementChild;
-    var temp, sr, shadows, i, j;
-    shadows = [];
-    sr = node.shadowRoot;
-    while(sr) {
-      shadows.push(sr);
-      sr = sr.olderShadowRoot;
-    }
-    for (i = shadows.length - 1; i >= 0; i--) {
-      temp = shadows[i].querySelectorAll(selector);
-      for(j = 0; j < temp.length; j++) {
-        results.push(temp[j]);
-      }
-    }
-    while (el) {
-      queryAllShadows(el, selector, results);
-      el = el.nextElementSibling;
-    }
-    return results;
-  }
-
-  scope.queryAllShadows = function(node, selector, all) {
-    if (all) {
-      return queryAllShadows(node, selector, []);
-    } else {
-      return queryShadow(node, selector);
-    }
-  };
-})(window.Platform);
-
-/*
- * 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
- */
-
-/*
-  This is a limited shim for ShadowDOM css styling.
-  https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#styles
-  
-  The intention here is to support only the styling features which can be 
-  relatively simply implemented. The goal is to allow users to avoid the 
-  most obvious pitfalls and do so without compromising performance significantly. 
-  For ShadowDOM styling that's not covered here, a set of best practices
-  can be provided that should allow users to accomplish more complex styling.
-
-  The following is a list of specific ShadowDOM styling features and a brief
-  discussion of the approach used to shim.
-
-  Shimmed features:
-
-  * :host, :host-context: ShadowDOM allows styling of the shadowRoot's host
-  element using the :host rule. To shim this feature, the :host styles are 
-  reformatted and prefixed with a given scope name and promoted to a 
-  document level stylesheet.
-  For example, given a scope name of .foo, a rule like this:
-  
-    :host {
-        background: red;
-      }
-    }
-  
-  becomes:
-  
-    .foo {
-      background: red;
-    }
-  
-  * encapsultion: Styles defined within ShadowDOM, apply only to 
-  dom inside the ShadowDOM. Polymer uses one of two techniques to imlement
-  this feature.
-  
-  By default, rules are prefixed with the host element tag name 
-  as a descendant selector. This ensures styling does not leak out of the 'top'
-  of the element's ShadowDOM. For example,
-
-  div {
-      font-weight: bold;
-    }
-  
-  becomes:
-
-  x-foo div {
-      font-weight: bold;
-    }
-  
-  becomes:
-
-
-  Alternatively, if Platform.ShadowCSS.strictStyling is set to true then 
-  selectors are scoped by adding an attribute selector suffix to each
-  simple selector that contains the host element tag name. Each element 
-  in the element's ShadowDOM template is also given the scope attribute. 
-  Thus, these rules match only elements that have the scope attribute.
-  For example, given a scope name of x-foo, a rule like this:
-  
-    div {
-      font-weight: bold;
-    }
-  
-  becomes:
-  
-    div[x-foo] {
-      font-weight: bold;
-    }
-
-  Note that elements that are dynamically added to a scope must have the scope
-  selector added to them manually.
-
-  * upper/lower bound encapsulation: Styles which are defined outside a
-  shadowRoot should not cross the ShadowDOM boundary and should not apply
-  inside a shadowRoot.
-
-  This styling behavior is not emulated. Some possible ways to do this that 
-  were rejected due to complexity and/or performance concerns include: (1) reset
-  every possible property for every possible selector for a given scope name;
-  (2) re-implement css in javascript.
-  
-  As an alternative, users should make sure to use selectors
-  specific to the scope in which they are working.
-  
-  * ::distributed: This behavior is not emulated. It's often not necessary
-  to style the contents of a specific insertion point and instead, descendants
-  of the host element can be styled selectively. Users can also create an 
-  extra node around an insertion point and style that node's contents
-  via descendent selectors. For example, with a shadowRoot like this:
-  
-    <style>
-      ::content(div) {
-        background: red;
-      }
-    </style>
-    <content></content>
-  
-  could become:
-  
-    <style>
-      / *@polyfill .content-container div * / 
-      ::content(div) {
-        background: red;
-      }
-    </style>
-    <div class="content-container">
-      <content></content>
-    </div>
-  
-  Note the use of @polyfill in the comment above a ShadowDOM specific style
-  declaration. This is a directive to the styling shim to use the selector 
-  in comments in lieu of the next selector when running under polyfill.
-*/
-(function(scope) {
-
-var ShadowCSS = {
-  strictStyling: false,
-  registry: {},
-  // Shim styles for a given root associated with a name and extendsName
-  // 1. cache root styles by name
-  // 2. optionally tag root nodes with scope name
-  // 3. shim polyfill directives /* @polyfill */ and /* @polyfill-rule */
-  // 4. shim :host and scoping
-  shimStyling: function(root, name, extendsName) {
-    var scopeStyles = this.prepareRoot(root, name, extendsName);
-    var typeExtension = this.isTypeExtension(extendsName);
-    var scopeSelector = this.makeScopeSelector(name, typeExtension);
-    // use caching to make working with styles nodes easier and to facilitate
-    // lookup of extendee
-    var cssText = stylesToCssText(scopeStyles, true);
-    cssText = this.scopeCssText(cssText, scopeSelector);
-    // cache shimmed css on root for user extensibility
-    if (root) {
-      root.shimmedStyle = cssText;
-    }
-    // add style to document
-    this.addCssToDocument(cssText, name);
-  },
-  /*
-  * Shim a style element with the given selector. Returns cssText that can
-  * be included in the document via Platform.ShadowCSS.addCssToDocument(css).
-  */
-  shimStyle: function(style, selector) {
-    return this.shimCssText(style.textContent, selector);
-  },
-  /*
-  * Shim some cssText with the given selector. Returns cssText that can
-  * be included in the document via Platform.ShadowCSS.addCssToDocument(css).
-  */
-  shimCssText: function(cssText, selector) {
-    cssText = this.insertDirectives(cssText);
-    return this.scopeCssText(cssText, selector);
-  },
-  makeScopeSelector: function(name, typeExtension) {
-    if (name) {
-      return typeExtension ? '[is=' + name + ']' : name;
-    }
-    return '';
-  },
-  isTypeExtension: function(extendsName) {
-    return extendsName && extendsName.indexOf('-') < 0;
-  },
-  prepareRoot: function(root, name, extendsName) {
-    var def = this.registerRoot(root, name, extendsName);
-    this.replaceTextInStyles(def.rootStyles, this.insertDirectives);
-    // remove existing style elements
-    this.removeStyles(root, def.rootStyles);
-    // apply strict attr
-    if (this.strictStyling) {
-      this.applyScopeToContent(root, name);
-    }
-    return def.scopeStyles;
-  },
-  removeStyles: function(root, styles) {
-    for (var i=0, l=styles.length, s; (i<l) && (s=styles[i]); i++) {
-      s.parentNode.removeChild(s);
-    }
-  },
-  registerRoot: function(root, name, extendsName) {
-    var def = this.registry[name] = {
-      root: root,
-      name: name,
-      extendsName: extendsName
-    }
-    var styles = this.findStyles(root);
-    def.rootStyles = styles;
-    def.scopeStyles = def.rootStyles;
-    var extendee = this.registry[def.extendsName];
-    if (extendee) {
-      def.scopeStyles = extendee.scopeStyles.concat(def.scopeStyles);
-    }
-    return def;
-  },
-  findStyles: function(root) {
-    if (!root) {
-      return [];
-    }
-    var styles = root.querySelectorAll('style');
-    return Array.prototype.filter.call(styles, function(s) {
-      return !s.hasAttribute(NO_SHIM_ATTRIBUTE);
-    });
-  },
-  applyScopeToContent: function(root, name) {
-    if (root) {
-      // add the name attribute to each node in root.
-      Array.prototype.forEach.call(root.querySelectorAll('*'),
-          function(node) {
-            node.setAttribute(name, '');
-          });
-      // and template contents too
-      Array.prototype.forEach.call(root.querySelectorAll('template'),
-          function(template) {
-            this.applyScopeToContent(template.content, name);
-          },
-          this);
-    }
-  },
-  insertDirectives: function(cssText) {
-    cssText = this.insertPolyfillDirectivesInCssText(cssText);
-    return this.insertPolyfillRulesInCssText(cssText);
-  },
-  /*
-   * Process styles to convert native ShadowDOM rules that will trip
-   * up the css parser; we rely on decorating the stylesheet with inert rules.
-   * 
-   * For example, we convert this rule:
-   * 
-   * polyfill-next-selector { content: ':host menu-item'; }
-   * ::content menu-item {
-   * 
-   * to this:
-   * 
-   * scopeName menu-item {
-   *
-  **/
-  insertPolyfillDirectivesInCssText: function(cssText) {
-    // TODO(sorvell): remove either content or comment
-    cssText = cssText.replace(cssCommentNextSelectorRe, function(match, p1) {
-      // remove end comment delimiter and add block start
-      return p1.slice(0, -2) + '{';
-    });
-    return cssText.replace(cssContentNextSelectorRe, function(match, p1) {
-      return p1 + ' {';
-    });
-  },
-  /*
-   * Process styles to add rules which will only apply under the polyfill
-   * 
-   * For example, we convert this rule:
-   * 
-   * polyfill-rule {
-   *   content: ':host menu-item';
-   * ...
-   * }
-   * 
-   * to this:
-   * 
-   * scopeName menu-item {...}
-   *
-  **/
-  insertPolyfillRulesInCssText: function(cssText) {
-    // TODO(sorvell): remove either content or comment
-    cssText = cssText.replace(cssCommentRuleRe, function(match, p1) {
-      // remove end comment delimiter
-      return p1.slice(0, -1);
-    });
-    return cssText.replace(cssContentRuleRe, function(match, p1, p2, p3) {
-      var rule = match.replace(p1, '').replace(p2, '');
-      return p3 + rule;
-    });
-  },
-  /* Ensure styles are scoped. Pseudo-scoping takes a rule like:
-   * 
-   *  .foo {... } 
-   *  
-   *  and converts this to
-   *  
-   *  scopeName .foo { ... }
-  */
-  scopeCssText: function(cssText, scopeSelector) {
-    var unscoped = this.extractUnscopedRulesFromCssText(cssText);
-    cssText = this.insertPolyfillHostInCssText(cssText);
-    cssText = this.convertColonHost(cssText);
-    cssText = this.convertColonHostContext(cssText);
-    cssText = this.convertShadowDOMSelectors(cssText);
-    if (scopeSelector) {
-      var self = this, cssText;
-      withCssRules(cssText, function(rules) {
-        cssText = self.scopeRules(rules, scopeSelector);
-      });
-
-    }
-    cssText = cssText + '\n' + unscoped;
-    return cssText.trim();
-  },
-  /*
-   * Process styles to add rules which will only apply under the polyfill
-   * and do not process via CSSOM. (CSSOM is destructive to rules on rare 
-   * occasions, e.g. -webkit-calc on Safari.)
-   * For example, we convert this rule:
-   * 
-   * (comment start) @polyfill-unscoped-rule menu-item { 
-   * ... } (comment end)
-   * 
-   * to this:
-   * 
-   * menu-item {...}
-   *
-  **/
-  extractUnscopedRulesFromCssText: function(cssText) {
-    // TODO(sorvell): remove either content or comment
-    var r = '', m;
-    while (m = cssCommentUnscopedRuleRe.exec(cssText)) {
-      r += m[1].slice(0, -1) + '\n\n';
-    }
-    while (m = cssContentUnscopedRuleRe.exec(cssText)) {
-      r += m[0].replace(m[2], '').replace(m[1], m[3]) + '\n\n';
-    }
-    return r;
-  },
-  /*
-   * convert a rule like :host(.foo) > .bar { }
-   *
-   * to
-   *
-   * scopeName.foo > .bar
-  */
-  convertColonHost: function(cssText) {
-    return this.convertColonRule(cssText, cssColonHostRe,
-        this.colonHostPartReplacer);
-  },
-  /*
-   * convert a rule like :host-context(.foo) > .bar { }
-   *
-   * to
-   *
-   * scopeName.foo > .bar, .foo scopeName > .bar { }
-   * 
-   * and
-   *
-   * :host-context(.foo:host) .bar { ... }
-   * 
-   * to
-   * 
-   * scopeName.foo .bar { ... }
-  */
-  convertColonHostContext: function(cssText) {
-    return this.convertColonRule(cssText, cssColonHostContextRe,
-        this.colonHostContextPartReplacer);
-  },
-  convertColonRule: function(cssText, regExp, partReplacer) {
-    // p1 = :host, p2 = contents of (), p3 rest of rule
-    return cssText.replace(regExp, function(m, p1, p2, p3) {
-      p1 = polyfillHostNoCombinator;
-      if (p2) {
-        var parts = p2.split(','), r = [];
-        for (var i=0, l=parts.length, p; (i<l) && (p=parts[i]); i++) {
-          p = p.trim();
-          r.push(partReplacer(p1, p, p3));
-        }
-        return r.join(',');
-      } else {
-        return p1 + p3;
-      }
-    });
-  },
-  colonHostContextPartReplacer: function(host, part, suffix) {
-    if (part.match(polyfillHost)) {
-      return this.colonHostPartReplacer(host, part, suffix);
-    } else {
-      return host + part + suffix + ', ' + part + ' ' + host + suffix;
-    }
-  },
-  colonHostPartReplacer: function(host, part, suffix) {
-    return host + part.replace(polyfillHost, '') + suffix;
-  },
-  /*
-   * Convert combinators like ::shadow and pseudo-elements like ::content
-   * by replacing with space.
-  */
-  convertShadowDOMSelectors: function(cssText) {
-    for (var i=0; i < shadowDOMSelectorsRe.length; i++) {
-      cssText = cssText.replace(shadowDOMSelectorsRe[i], ' ');
-    }
-    return cssText;
-  },
-  // change a selector like 'div' to 'name div'
-  scopeRules: function(cssRules, scopeSelector) {
-    var cssText = '';
-    if (cssRules) {
-      Array.prototype.forEach.call(cssRules, function(rule) {
-        if (rule.selectorText && (rule.style && rule.style.cssText !== undefined)) {
-          cssText += this.scopeSelector(rule.selectorText, scopeSelector, 
-            this.strictStyling) + ' {\n\t';
-          cssText += this.propertiesFromRule(rule) + '\n}\n\n';
-        } else if (rule.type === CSSRule.MEDIA_RULE) {
-          cssText += '@media ' + rule.media.mediaText + ' {\n';
-          cssText += this.scopeRules(rule.cssRules, scopeSelector);
-          cssText += '\n}\n\n';
-        } else {
-          // KEYFRAMES_RULE in IE throws when we query cssText
-          // when it contains a -webkit- property.
-          // if this happens, we fallback to constructing the rule
-          // from the CSSRuleSet
-          // https://connect.microsoft.com/IE/feedbackdetail/view/955703/accessing-csstext-of-a-keyframe-rule-that-contains-a-webkit-property-via-cssom-generates-exception
-          try {
-            if (rule.cssText) {
-              cssText += rule.cssText + '\n\n';
-            }
-          } catch(x) {
-            if (rule.type === CSSRule.KEYFRAMES_RULE && rule.cssRules) {
-              cssText += this.ieSafeCssTextFromKeyFrameRule(rule);
-            }
-          }
-        }
-      }, this);
-    }
-    return cssText;
-  },
-  ieSafeCssTextFromKeyFrameRule: function(rule) {
-    var cssText = '@keyframes ' + rule.name + ' {';
-    Array.prototype.forEach.call(rule.cssRules, function(rule) {
-      cssText += ' ' + rule.keyText + ' {' + rule.style.cssText + '}';
-    });
-    cssText += ' }';
-    return cssText;
-  },
-  scopeSelector: function(selector, scopeSelector, strict) {
-    var r = [], parts = selector.split(',');
-    parts.forEach(function(p) {
-      p = p.trim();
-      if (this.selectorNeedsScoping(p, scopeSelector)) {
-        p = (strict && !p.match(polyfillHostNoCombinator)) ? 
-            this.applyStrictSelectorScope(p, scopeSelector) :
-            this.applySelectorScope(p, scopeSelector);
-      }
-      r.push(p);
-    }, this);
-    return r.join(', ');
-  },
-  selectorNeedsScoping: function(selector, scopeSelector) {
-    if (Array.isArray(scopeSelector)) {
-      return true;
-    }
-    var re = this.makeScopeMatcher(scopeSelector);
-    return !selector.match(re);
-  },
-  makeScopeMatcher: function(scopeSelector) {
-    scopeSelector = scopeSelector.replace(/\[/g, '\\[').replace(/\[/g, '\\]');
-    return new RegExp('^(' + scopeSelector + ')' + selectorReSuffix, 'm');
-  },
-  applySelectorScope: function(selector, selectorScope) {
-    return Array.isArray(selectorScope) ?
-        this.applySelectorScopeList(selector, selectorScope) :
-        this.applySimpleSelectorScope(selector, selectorScope);
-  },
-  // apply an array of selectors
-  applySelectorScopeList: function(selector, scopeSelectorList) {
-    var r = [];
-    for (var i=0, s; (s=scopeSelectorList[i]); i++) {
-      r.push(this.applySimpleSelectorScope(selector, s));
-    }
-    return r.join(', ');
-  },
-  // scope via name and [is=name]
-  applySimpleSelectorScope: function(selector, scopeSelector) {
-    if (selector.match(polyfillHostRe)) {
-      selector = selector.replace(polyfillHostNoCombinator, scopeSelector);
-      return selector.replace(polyfillHostRe, scopeSelector + ' ');
-    } else {
-      return scopeSelector + ' ' + selector;
-    }
-  },
-  // return a selector with [name] suffix on each simple selector
-  // e.g. .foo.bar > .zot becomes .foo[name].bar[name] > .zot[name]
-  applyStrictSelectorScope: function(selector, scopeSelector) {
-    scopeSelector = scopeSelector.replace(/\[is=([^\]]*)\]/g, '$1');
-    var splits = [' ', '>', '+', '~'],
-      scoped = selector,
-      attrName = '[' + scopeSelector + ']';
-    splits.forEach(function(sep) {
-      var parts = scoped.split(sep);
-      scoped = parts.map(function(p) {
-        // remove :host since it should be unnecessary
-        var t = p.trim().replace(polyfillHostRe, '');
-        if (t && (splits.indexOf(t) < 0) && (t.indexOf(attrName) < 0)) {
-          p = t.replace(/([^:]*)(:*)(.*)/, '$1' + attrName + '$2$3')
-        }
-        return p;
-      }).join(sep);
-    });
-    return scoped;
-  },
-  insertPolyfillHostInCssText: function(selector) {
-    return selector.replace(colonHostContextRe, polyfillHostContext).replace(
-        colonHostRe, polyfillHost);
-  },
-  propertiesFromRule: function(rule) {
-    var cssText = rule.style.cssText;
-    // TODO(sorvell): Safari cssom incorrectly removes quotes from the content
-    // property. (https://bugs.webkit.org/show_bug.cgi?id=118045)
-    // don't replace attr rules
-    if (rule.style.content && !rule.style.content.match(/['"]+|attr/)) {
-      cssText = cssText.replace(/content:[^;]*;/g, 'content: \'' + 
-          rule.style.content + '\';');
-    }
-    // TODO(sorvell): we can workaround this issue here, but we need a list
-    // of troublesome properties to fix https://github.com/Polymer/platform/issues/53
-    //
-    // inherit rules can be omitted from cssText
-    // TODO(sorvell): remove when Blink bug is fixed:
-    // https://code.google.com/p/chromium/issues/detail?id=358273
-    var style = rule.style;
-    for (var i in style) {
-      if (style[i] === 'initial') {
-        cssText += i + ': initial; ';
-      }
-    }
-    return cssText;
-  },
-  replaceTextInStyles: function(styles, action) {
-    if (styles && action) {
-      if (!(styles instanceof Array)) {
-        styles = [styles];
-      }
-      Array.prototype.forEach.call(styles, function(s) {
-        s.textContent = action.call(this, s.textContent);
-      }, this);
-    }
-  },
-  addCssToDocument: function(cssText, name) {
-    if (cssText.match('@import')) {
-      addOwnSheet(cssText, name);
-    } else {
-      addCssToDocument(cssText);
-    }
-  }
-};
-
-var selectorRe = /([^{]*)({[\s\S]*?})/gim,
-    cssCommentRe = /\/\*[^*]*\*+([^/*][^*]*\*+)*\//gim,
-    // TODO(sorvell): remove either content or comment
-    cssCommentNextSelectorRe = /\/\*\s*@polyfill ([^*]*\*+([^/*][^*]*\*+)*\/)([^{]*?){/gim,
-    cssContentNextSelectorRe = /polyfill-next-selector[^}]*content\:[\s]*?['"](.*?)['"][;\s]*}([^{]*?){/gim,  
-    // TODO(sorvell): remove either content or comment
-    cssCommentRuleRe = /\/\*\s@polyfill-rule([^*]*\*+([^/*][^*]*\*+)*)\//gim,
-    cssContentRuleRe = /(polyfill-rule)[^}]*(content\:[\s]*['"](.*?)['"])[;\s]*[^}]*}/gim,
-    // TODO(sorvell): remove either content or comment
-    cssCommentUnscopedRuleRe = /\/\*\s@polyfill-unscoped-rule([^*]*\*+([^/*][^*]*\*+)*)\//gim,
-    cssContentUnscopedRuleRe = /(polyfill-unscoped-rule)[^}]*(content\:[\s]*['"](.*?)['"])[;\s]*[^}]*}/gim,
-    cssPseudoRe = /::(x-[^\s{,(]*)/gim,
-    cssPartRe = /::part\(([^)]*)\)/gim,
-    // note: :host pre-processed to -shadowcsshost.
-    polyfillHost = '-shadowcsshost',
-    // note: :host-context pre-processed to -shadowcsshostcontext.
-    polyfillHostContext = '-shadowcsscontext',
-    parenSuffix = ')(?:\\((' +
-        '(?:\\([^)(]*\\)|[^)(]*)+?' +
-        ')\\))?([^,{]*)';
-    cssColonHostRe = new RegExp('(' + polyfillHost + parenSuffix, 'gim'),
-    cssColonHostContextRe = new RegExp('(' + polyfillHostContext + parenSuffix, 'gim'),
-    selectorReSuffix = '([>\\s~+\[.,{:][\\s\\S]*)?$',
-    colonHostRe = /\:host/gim,
-    colonHostContextRe = /\:host-context/gim,
-    /* host name without combinator */
-    polyfillHostNoCombinator = polyfillHost + '-no-combinator',
-    polyfillHostRe = new RegExp(polyfillHost, 'gim'),
-    polyfillHostContextRe = new RegExp(polyfillHostContext, 'gim'),
-    shadowDOMSelectorsRe = [
-      /\^\^/g,
-      /\^/g,
-      /\/shadow\//g,
-      /\/shadow-deep\//g,
-      /::shadow/g,
-      /\/deep\//g,
-      /::content/g
-    ];
-
-function stylesToCssText(styles, preserveComments) {
-  var cssText = '';
-  Array.prototype.forEach.call(styles, function(s) {
-    cssText += s.textContent + '\n\n';
-  });
-  // strip comments for easier processing
-  if (!preserveComments) {
-    cssText = cssText.replace(cssCommentRe, '');
-  }
-  return cssText;
-}
-
-function cssTextToStyle(cssText) {
-  var style = document.createElement('style');
-  style.textContent = cssText;
-  return style;
-}
-
-function cssToRules(cssText) {
-  var style = cssTextToStyle(cssText);
-  document.head.appendChild(style);
-  var rules = [];
-  if (style.sheet) {
-    // TODO(sorvell): Firefox throws when accessing the rules of a stylesheet
-    // with an @import
-    // https://bugzilla.mozilla.org/show_bug.cgi?id=625013
-    try {
-      rules = style.sheet.cssRules;
-    } catch(e) {
-      //
-    }
-  } else {
-    console.warn('sheet not found', style);
-  }
-  style.parentNode.removeChild(style);
-  return rules;
-}
-
-var frame = document.createElement('iframe');
-frame.style.display = 'none';
-
-function initFrame() {
-  frame.initialized = true;
-  document.body.appendChild(frame);
-  var doc = frame.contentDocument;
-  var base = doc.createElement('base');
-  base.href = document.baseURI;
-  doc.head.appendChild(base);
-}
-
-function inFrame(fn) {
-  if (!frame.initialized) {
-    initFrame();
-  }
-  document.body.appendChild(frame);
-  fn(frame.contentDocument);
-  document.body.removeChild(frame);
-}
-
-// TODO(sorvell): use an iframe if the cssText contains an @import to workaround
-// https://code.google.com/p/chromium/issues/detail?id=345114
-var isChrome = navigator.userAgent.match('Chrome');
-function withCssRules(cssText, callback) {
-  if (!callback) {
-    return;
-  }
-  var rules;
-  if (cssText.match('@import') && isChrome) {
-    var style = cssTextToStyle(cssText);
-    inFrame(function(doc) {
-      doc.head.appendChild(style.impl);
-      rules = Array.prototype.slice.call(style.sheet.cssRules, 0);
-      callback(rules);
-    });
-  } else {
-    rules = cssToRules(cssText);
-    callback(rules);
-  }
-}
-
-function rulesToCss(cssRules) {
-  for (var i=0, css=[]; i < cssRules.length; i++) {
-    css.push(cssRules[i].cssText);
-  }
-  return css.join('\n\n');
-}
-
-function addCssToDocument(cssText) {
-  if (cssText) {
-    getSheet().appendChild(document.createTextNode(cssText));
-  }
-}
-
-function addOwnSheet(cssText, name) {
-  var style = cssTextToStyle(cssText);
-  style.setAttribute(name, '');
-  style.setAttribute(SHIMMED_ATTRIBUTE, '');
-  document.head.appendChild(style);
-}
-
-var SHIM_ATTRIBUTE = 'shim-shadowdom';
-var SHIMMED_ATTRIBUTE = 'shim-shadowdom-css';
-var NO_SHIM_ATTRIBUTE = 'no-shim';
-
-var sheet;
-function getSheet() {
-  if (!sheet) {
-    sheet = document.createElement("style");
-    sheet.setAttribute(SHIMMED_ATTRIBUTE, '');
-    sheet[SHIMMED_ATTRIBUTE] = true;
-  }
-  return sheet;
-}
-
-// add polyfill stylesheet to document
-if (window.ShadowDOMPolyfill) {
-  addCssToDocument('style { display: none !important; }\n');
-  var doc = wrap(document);
-  var head = doc.querySelector('head');
-  head.insertBefore(getSheet(), head.childNodes[0]);
-
-  // TODO(sorvell): monkey-patching HTMLImports is abusive;
-  // consider a better solution.
-  document.addEventListener('DOMContentLoaded', function() {
-    var urlResolver = scope.urlResolver;
-    
-    if (window.HTMLImports && !HTMLImports.useNative) {
-      var SHIM_SHEET_SELECTOR = 'link[rel=stylesheet]' +
-          '[' + SHIM_ATTRIBUTE + ']';
-      var SHIM_STYLE_SELECTOR = 'style[' + SHIM_ATTRIBUTE + ']';
-      HTMLImports.importer.documentPreloadSelectors += ',' + SHIM_SHEET_SELECTOR;
-      HTMLImports.importer.importsPreloadSelectors += ',' + SHIM_SHEET_SELECTOR;
-
-      HTMLImports.parser.documentSelectors = [
-        HTMLImports.parser.documentSelectors,
-        SHIM_SHEET_SELECTOR,
-        SHIM_STYLE_SELECTOR
-      ].join(',');
-  
-      var originalParseGeneric = HTMLImports.parser.parseGeneric;
-
-      HTMLImports.parser.parseGeneric = function(elt) {
-        if (elt[SHIMMED_ATTRIBUTE]) {
-          return;
-        }
-        var style = elt.__importElement || elt;
-        if (!style.hasAttribute(SHIM_ATTRIBUTE)) {
-          originalParseGeneric.call(this, elt);
-          return;
-        }
-        if (elt.__resource) {
-          style = elt.ownerDocument.createElement('style');
-          style.textContent = elt.__resource;
-        }
-        // relay on HTMLImports for path fixup
-        HTMLImports.path.resolveUrlsInStyle(style);
-        style.textContent = ShadowCSS.shimStyle(style);
-        style.removeAttribute(SHIM_ATTRIBUTE, '');
-        style.setAttribute(SHIMMED_ATTRIBUTE, '');
-        style[SHIMMED_ATTRIBUTE] = true;
-        // place in document
-        if (style.parentNode !== head) {
-          // replace links in head
-          if (elt.parentNode === head) {
-            head.replaceChild(style, elt);
-          } else {
-            this.addElementToDocument(style);
-          }
-        }
-        style.__importParsed = true;
-        this.markParsingComplete(elt);
-        this.parseNext();
-      }
-
-      var hasResource = HTMLImports.parser.hasResource;
-      HTMLImports.parser.hasResource = function(node) {
-        if (node.localName === 'link' && node.rel === 'stylesheet' &&
-            node.hasAttribute(SHIM_ATTRIBUTE)) {
-          return (node.__resource);
-        } else {
-          return hasResource.call(this, node);
-        }
-      }
-
-    }
-  });
-}
-
-// exports
-scope.ShadowCSS = ShadowCSS;
-
-})(window.Platform);
-
-} else {
-/*
- * 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(scope) {
-
-  // so we can call wrap/unwrap without testing for ShadowDOMPolyfill
-  window.wrap = window.unwrap = function(n){
-    return n;
-  }
-
-  addEventListener('DOMContentLoaded', function() {
-    if (CustomElements.useNative === false) {
-      var originalCreateShadowRoot = Element.prototype.createShadowRoot;
-      Element.prototype.createShadowRoot = function() {
-        var root = originalCreateShadowRoot.call(this);
-        CustomElements.watchShadow(this);
-        return root;
-      };
-    }
-  });
-
-})(window.Platform);
-
-}
-/* Any copyright is dedicated to the Public Domain.
- * http://creativecommons.org/publicdomain/zero/1.0/ */
-
-(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);
-
-/*
- * 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(scope) {
-
-// Old versions of iOS do not have bind.
-
-if (!Function.prototype.bind) {
-  Function.prototype.bind = function(scope) {
-    var self = this;
-    var args = Array.prototype.slice.call(arguments, 1);
-    return function() {
-      var args2 = args.slice();
-      args2.push.apply(args2, arguments);
-      return self.apply(scope, args2);
-    };
-  };
-}
-
-})(window.Platform);
-
-/*
- * Copyright 2012 The Polymer Authors. All rights reserved.
- * Use of this source code is goverened by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
-(function(global) {
-
-  var registrationsTable = new WeakMap();
-
-  // We use setImmediate or postMessage for our future callback.
-  var setImmediate = window.msSetImmediate;
-
-  // Use post message to emulate setImmediate.
-  if (!setImmediate) {
-    var setImmediateQueue = [];
-    var sentinel = String(Math.random());
-    window.addEventListener('message', function(e) {
-      if (e.data === sentinel) {
-        var queue = setImmediateQueue;
-        setImmediateQueue = [];
-        queue.forEach(function(func) {
-          func();
-        });
-      }
-    });
-    setImmediate = function(func) {
-      setImmediateQueue.push(func);
-      window.postMessage(sentinel, '*');
-    };
-  }
-
-  // This is used to ensure that we never schedule 2 callas to setImmediate
-  var isScheduled = false;
-
-  // Keep track of observers that needs to be notified next time.
-  var scheduledObservers = [];
-
-  /**
-   * Schedules |dispatchCallback| to be called in the future.
-   * @param {MutationObserver} observer
-   */
-  function scheduleCallback(observer) {
-    scheduledObservers.push(observer);
-    if (!isScheduled) {
-      isScheduled = true;
-      setImmediate(dispatchCallbacks);
-    }
-  }
-
-  function wrapIfNeeded(node) {
-    return window.ShadowDOMPolyfill &&
-        window.ShadowDOMPolyfill.wrapIfNeeded(node) ||
-        node;
-  }
-
-  function dispatchCallbacks() {
-    // http://dom.spec.whatwg.org/#mutation-observers
-
-    isScheduled = false; // Used to allow a new setImmediate call above.
-
-    var observers = scheduledObservers;
-    scheduledObservers = [];
-    // Sort observers based on their creation UID (incremental).
-    observers.sort(function(o1, o2) {
-      return o1.uid_ - o2.uid_;
-    });
-
-    var anyNonEmpty = false;
-    observers.forEach(function(observer) {
-
-      // 2.1, 2.2
-      var queue = observer.takeRecords();
-      // 2.3. Remove all transient registered observers whose observer is mo.
-      removeTransientObserversFor(observer);
-
-      // 2.4
-      if (queue.length) {
-        observer.callback_(queue, observer);
-        anyNonEmpty = true;
-      }
-    });
-
-    // 3.
-    if (anyNonEmpty)
-      dispatchCallbacks();
-  }
-
-  function removeTransientObserversFor(observer) {
-    observer.nodes_.forEach(function(node) {
-      var registrations = registrationsTable.get(node);
-      if (!registrations)
-        return;
-      registrations.forEach(function(registration) {
-        if (registration.observer === observer)
-          registration.removeTransientObservers();
-      });
-    });
-  }
-
-  /**
-   * This function is used for the "For each registered observer observer (with
-   * observer's options as options) in target's list of registered observers,
-   * run these substeps:" and the "For each ancestor ancestor of target, and for
-   * each registered observer observer (with options options) in ancestor's list
-   * of registered observers, run these substeps:" part of the algorithms. The
-   * |options.subtree| is checked to ensure that the callback is called
-   * correctly.
-   *
-   * @param {Node} target
-   * @param {function(MutationObserverInit):MutationRecord} callback
-   */
-  function forEachAncestorAndObserverEnqueueRecord(target, callback) {
-    for (var node = target; node; node = node.parentNode) {
-      var registrations = registrationsTable.get(node);
-
-      if (registrations) {
-        for (var j = 0; j < registrations.length; j++) {
-          var registration = registrations[j];
-          var options = registration.options;
-
-          // Only target ignores subtree.
-          if (node !== target && !options.subtree)
-            continue;
-
-          var record = callback(options);
-          if (record)
-            registration.enqueue(record);
-        }
-      }
-    }
-  }
-
-  var uidCounter = 0;
-
-  /**
-   * The class that maps to the DOM MutationObserver interface.
-   * @param {Function} callback.
-   * @constructor
-   */
-  function JsMutationObserver(callback) {
-    this.callback_ = callback;
-    this.nodes_ = [];
-    this.records_ = [];
-    this.uid_ = ++uidCounter;
-  }
-
-  JsMutationObserver.prototype = {
-    observe: function(target, options) {
-      target = wrapIfNeeded(target);
-
-      // 1.1
-      if (!options.childList && !options.attributes && !options.characterData ||
-
-          // 1.2
-          options.attributeOldValue && !options.attributes ||
-
-          // 1.3
-          options.attributeFilter && options.attributeFilter.length &&
-              !options.attributes ||
-
-          // 1.4
-          options.characterDataOldValue && !options.characterData) {
-
-        throw new SyntaxError();
-      }
-
-      var registrations = registrationsTable.get(target);
-      if (!registrations)
-        registrationsTable.set(target, registrations = []);
-
-      // 2
-      // If target's list of registered observers already includes a registered
-      // observer associated with the context object, replace that registered
-      // observer's options with options.
-      var registration;
-      for (var i = 0; i < registrations.length; i++) {
-        if (registrations[i].observer === this) {
-          registration = registrations[i];
-          registration.removeListeners();
-          registration.options = options;
-          break;
-        }
-      }
-
-      // 3.
-      // Otherwise, add a new registered observer to target's list of registered
-      // observers with the context object as the observer and options as the
-      // options, and add target to context object's list of nodes on which it
-      // is registered.
-      if (!registration) {
-        registration = new Registration(this, target, options);
-        registrations.push(registration);
-        this.nodes_.push(target);
-      }
-
-      registration.addListeners();
-    },
-
-    disconnect: function() {
-      this.nodes_.forEach(function(node) {
-        var registrations = registrationsTable.get(node);
-        for (var i = 0; i < registrations.length; i++) {
-          var registration = registrations[i];
-          if (registration.observer === this) {
-            registration.removeListeners();
-            registrations.splice(i, 1);
-            // Each node can only have one registered observer associated with
-            // this observer.
-            break;
-          }
-        }
-      }, this);
-      this.records_ = [];
-    },
-
-    takeRecords: function() {
-      var copyOfRecords = this.records_;
-      this.records_ = [];
-      return copyOfRecords;
-    }
-  };
-
-  /**
-   * @param {string} type
-   * @param {Node} target
-   * @constructor
-   */
-  function MutationRecord(type, target) {
-    this.type = type;
-    this.target = target;
-    this.addedNodes = [];
-    this.removedNodes = [];
-    this.previousSibling = null;
-    this.nextSibling = null;
-    this.attributeName = null;
-    this.attributeNamespace = null;
-    this.oldValue = null;
-  }
-
-  function copyMutationRecord(original) {
-    var record = new MutationRecord(original.type, original.target);
-    record.addedNodes = original.addedNodes.slice();
-    record.removedNodes = original.removedNodes.slice();
-    record.previousSibling = original.previousSibling;
-    record.nextSibling = original.nextSibling;
-    record.attributeName = original.attributeName;
-    record.attributeNamespace = original.attributeNamespace;
-    record.oldValue = original.oldValue;
-    return record;
-  };
-
-  // We keep track of the two (possibly one) records used in a single mutation.
-  var currentRecord, recordWithOldValue;
-
-  /**
-   * Creates a record without |oldValue| and caches it as |currentRecord| for
-   * later use.
-   * @param {string} oldValue
-   * @return {MutationRecord}
-   */
-  function getRecord(type, target) {
-    return currentRecord = new MutationRecord(type, target);
-  }
-
-  /**
-   * Gets or creates a record with |oldValue| based in the |currentRecord|
-   * @param {string} oldValue
-   * @return {MutationRecord}
-   */
-  function getRecordWithOldValue(oldValue) {
-    if (recordWithOldValue)
-      return recordWithOldValue;
-    recordWithOldValue = copyMutationRecord(currentRecord);
-    recordWithOldValue.oldValue = oldValue;
-    return recordWithOldValue;
-  }
-
-  function clearRecords() {
-    currentRecord = recordWithOldValue = undefined;
-  }
-
-  /**
-   * @param {MutationRecord} record
-   * @return {boolean} Whether the record represents a record from the current
-   * mutation event.
-   */
-  function recordRepresentsCurrentMutation(record) {
-    return record === recordWithOldValue || record === currentRecord;
-  }
-
-  /**
-   * Selects which record, if any, to replace the last record in the queue.
-   * This returns |null| if no record should be replaced.
-   *
-   * @param {MutationRecord} lastRecord
-   * @param {MutationRecord} newRecord
-   * @param {MutationRecord}
-   */
-  function selectRecord(lastRecord, newRecord) {
-    if (lastRecord === newRecord)
-      return lastRecord;
-
-    // Check if the the record we are adding represents the same record. If
-    // so, we keep the one with the oldValue in it.
-    if (recordWithOldValue && recordRepresentsCurrentMutation(lastRecord))
-      return recordWithOldValue;
-
-    return null;
-  }
-
-  /**
-   * Class used to represent a registered observer.
-   * @param {MutationObserver} observer
-   * @param {Node} target
-   * @param {MutationObserverInit} options
-   * @constructor
-   */
-  function Registration(observer, target, options) {
-    this.observer = observer;
-    this.target = target;
-    this.options = options;
-    this.transientObservedNodes = [];
-  }
-
-  Registration.prototype = {
-    enqueue: function(record) {
-      var records = this.observer.records_;
-      var length = records.length;
-
-      // There are cases where we replace the last record with the new record.
-      // For example if the record represents the same mutation we need to use
-      // the one with the oldValue. If we get same record (this can happen as we
-      // walk up the tree) we ignore the new record.
-      if (records.length > 0) {
-        var lastRecord = records[length - 1];
-        var recordToReplaceLast = selectRecord(lastRecord, record);
-        if (recordToReplaceLast) {
-          records[length - 1] = recordToReplaceLast;
-          return;
-        }
-      } else {
-        scheduleCallback(this.observer);
-      }
-
-      records[length] = record;
-    },
-
-    addListeners: function() {
-      this.addListeners_(this.target);
-    },
-
-    addListeners_: function(node) {
-      var options = this.options;
-      if (options.attributes)
-        node.addEventListener('DOMAttrModified', this, true);
-
-      if (options.characterData)
-        node.addEventListener('DOMCharacterDataModified', this, true);
-
-      if (options.childList)
-        node.addEventListener('DOMNodeInserted', this, true);
-
-      if (options.childList || options.subtree)
-        node.addEventListener('DOMNodeRemoved', this, true);
-    },
-
-    removeListeners: function() {
-      this.removeListeners_(this.target);
-    },
-
-    removeListeners_: function(node) {
-      var options = this.options;
-      if (options.attributes)
-        node.removeEventListener('DOMAttrModified', this, true);
-
-      if (options.characterData)
-        node.removeEventListener('DOMCharacterDataModified', this, true);
-
-      if (options.childList)
-        node.removeEventListener('DOMNodeInserted', this, true);
-
-      if (options.childList || options.subtree)
-        node.removeEventListener('DOMNodeRemoved', this, true);
-    },
-
-    /**
-     * Adds a transient observer on node. The transient observer gets removed
-     * next time we deliver the change records.
-     * @param {Node} node
-     */
-    addTransientObserver: function(node) {
-      // Don't add transient observers on the target itself. We already have all
-      // the required listeners set up on the target.
-      if (node === this.target)
-        return;
-
-      this.addListeners_(node);
-      this.transientObservedNodes.push(node);
-      var registrations = registrationsTable.get(node);
-      if (!registrations)
-        registrationsTable.set(node, registrations = []);
-
-      // We know that registrations does not contain this because we already
-      // checked if node === this.target.
-      registrations.push(this);
-    },
-
-    removeTransientObservers: function() {
-      var transientObservedNodes = this.transientObservedNodes;
-      this.transientObservedNodes = [];
-
-      transientObservedNodes.forEach(function(node) {
-        // Transient observers are never added to the target.
-        this.removeListeners_(node);
-
-        var registrations = registrationsTable.get(node);
-        for (var i = 0; i < registrations.length; i++) {
-          if (registrations[i] === this) {
-            registrations.splice(i, 1);
-            // Each node can only have one registered observer associated with
-            // this observer.
-            break;
-          }
-        }
-      }, this);
-    },
-
-    handleEvent: function(e) {
-      // Stop propagation since we are managing the propagation manually.
-      // This means that other mutation events on the page will not work
-      // correctly but that is by design.
-      e.stopImmediatePropagation();
-
-      switch (e.type) {
-        case 'DOMAttrModified':
-          // http://dom.spec.whatwg.org/#concept-mo-queue-attributes
-
-          var name = e.attrName;
-          var namespace = e.relatedNode.namespaceURI;
-          var target = e.target;
-
-          // 1.
-          var record = new getRecord('attributes', target);
-          record.attributeName = name;
-          record.attributeNamespace = namespace;
-
-          // 2.
-          var oldValue =
-              e.attrChange === MutationEvent.ADDITION ? null : e.prevValue;
-
-          forEachAncestorAndObserverEnqueueRecord(target, function(options) {
-            // 3.1, 4.2
-            if (!options.attributes)
-              return;
-
-            // 3.2, 4.3
-            if (options.attributeFilter && options.attributeFilter.length &&
-                options.attributeFilter.indexOf(name) === -1 &&
-                options.attributeFilter.indexOf(namespace) === -1) {
-              return;
-            }
-            // 3.3, 4.4
-            if (options.attributeOldValue)
-              return getRecordWithOldValue(oldValue);
-
-            // 3.4, 4.5
-            return record;
-          });
-
-          break;
-
-        case 'DOMCharacterDataModified':
-          // http://dom.spec.whatwg.org/#concept-mo-queue-characterdata
-          var target = e.target;
-
-          // 1.
-          var record = getRecord('characterData', target);
-
-          // 2.
-          var oldValue = e.prevValue;
-
-
-          forEachAncestorAndObserverEnqueueRecord(target, function(options) {
-            // 3.1, 4.2
-            if (!options.characterData)
-              return;
-
-            // 3.2, 4.3
-            if (options.characterDataOldValue)
-              return getRecordWithOldValue(oldValue);
-
-            // 3.3, 4.4
-            return record;
-          });
-
-          break;
-
-        case 'DOMNodeRemoved':
-          this.addTransientObserver(e.target);
-          // Fall through.
-        case 'DOMNodeInserted':
-          // http://dom.spec.whatwg.org/#concept-mo-queue-childlist
-          var target = e.relatedNode;
-          var changedNode = e.target;
-          var addedNodes, removedNodes;
-          if (e.type === 'DOMNodeInserted') {
-            addedNodes = [changedNode];
-            removedNodes = [];
-          } else {
-
-            addedNodes = [];
-            removedNodes = [changedNode];
-          }
-          var previousSibling = changedNode.previousSibling;
-          var nextSibling = changedNode.nextSibling;
-
-          // 1.
-          var record = getRecord('childList', target);
-          record.addedNodes = addedNodes;
-          record.removedNodes = removedNodes;
-          record.previousSibling = previousSibling;
-          record.nextSibling = nextSibling;
-
-          forEachAncestorAndObserverEnqueueRecord(target, function(options) {
-            // 2.1, 3.2
-            if (!options.childList)
-              return;
-
-            // 2.2, 3.3
-            return record;
-          });
-
-      }
-
-      clearRecords();
-    }
-  };
-
-  global.JsMutationObserver = JsMutationObserver;
-
-  if (!global.MutationObserver)
-    global.MutationObserver = JsMutationObserver;
-
-
-})(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
- */
-window.HTMLImports = window.HTMLImports || {flags:{}};
-/*
- * 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(scope) {
-
-var IMPORT_LINK_TYPE = 'import';
-var hasNative = (IMPORT_LINK_TYPE in document.createElement('link'));
-var useNative = hasNative;
-var isIE = /Trident/.test(navigator.userAgent);
-
-// TODO(sorvell): SD polyfill intrusion
-var hasShadowDOMPolyfill = Boolean(window.ShadowDOMPolyfill);
-var wrap = function(node) {
-  return hasShadowDOMPolyfill ? ShadowDOMPolyfill.wrapIfNeeded(node) : node;
-};
-
-var rootDocument = wrap(document);
-    
-// 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.
-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);
-
-// call a callback when all HTMLImports in the document at call (or at least
-//  document ready) time 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).
-// 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.useNative = useNative;
-scope.isImportLoaded = isImportLoaded;
-scope.whenReady = whenReady;
-scope.rootDocument = rootDocument;
-scope.IMPORT_LINK_TYPE = IMPORT_LINK_TYPE;
-scope.isIE = isIE;
-
-})(window.HTMLImports);
-/*
- * 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(scope) {
-
-  // imports
-  var path = scope.path;
-  var xhr = scope.xhr;
-  var flags = scope.flags;
-
-  // TODO(sorvell): this loader supports a dynamic list of urls
-  // and an oncomplete callback that is called when the loader is done.
-  // The polyfill currently does *not* need this dynamism or the onComplete
-  // concept. Because of this, the loader could be simplified quite a bit.
-  var Loader = function(onLoad, onComplete) {
-    this.cache = {};
-    this.onload = onLoad;
-    this.oncomplete = onComplete;
-    this.inflight = 0;
-    this.pending = {};
-  };
-
-  Loader.prototype = {
-
-    addNodes: function(nodes) {
-      // number of transactions to complete
-      this.inflight += nodes.length;
-      // commence transactions
-      for (var i=0, l=nodes.length, n; (i<l) && (n=nodes[i]); i++) {
-        this.require(n);
-      }
-      // anything to do?
-      this.checkDone();
-    },
-
-    addNode: function(node) {
-      // number of transactions to complete
-      this.inflight++;
-      // commence transactions
-      this.require(node);
-      // anything to do?
-      this.checkDone();
-    },
-
-    require: function(elt) {
-      var url = elt.src || elt.href;
-      // ensure we have a standard url that can be used
-      // reliably for deduping.
-      // TODO(sjmiles): ad-hoc
-      elt.__nodeUrl = url;
-      // deduplication
-      if (!this.dedupe(url, elt)) {
-        // fetch this resource
-        this.fetch(url, elt);
-      }
-    },
-
-    dedupe: function(url, elt) {
-      if (this.pending[url]) {
-        // add to list of nodes waiting for inUrl
-        this.pending[url].push(elt);
-        // don't need fetch
-        return true;
-      }
-      var resource;
-      if (this.cache[url]) {
-        this.onload(url, elt, this.cache[url]);
-        // finished this transaction
-        this.tail();
-        // don't need fetch
-        return true;
-      }
-      // first node waiting for inUrl
-      this.pending[url] = [elt];
-      // need fetch (not a dupe)
-      return false;
-    },
-
-    fetch: function(url, elt) {
-      flags.load && console.log('fetch', url, elt);
-      if (url.match(/^data:/)) {
-        // Handle Data URI Scheme
-        var pieces = url.split(',');
-        var header = pieces[0];
-        var body = pieces[1];
-        if(header.indexOf(';base64') > -1) {
-          body = atob(body);
-        } else {
-          body = decodeURIComponent(body);
-        }
-        setTimeout(function() {
-            this.receive(url, elt, null, body);
-        }.bind(this), 0);
-      } else {
-        var receiveXhr = function(err, resource, redirectedUrl) {
-          this.receive(url, elt, err, resource, redirectedUrl);
-        }.bind(this);
-        xhr.load(url, receiveXhr);
-        // TODO(sorvell): blocked on)
-        // https://code.google.com/p/chromium/issues/detail?id=257221
-        // xhr'ing for a document makes scripts in imports runnable; otherwise
-        // they are not; however, it requires that we have doctype=html in
-        // the import which is unacceptable. This is only needed on Chrome
-        // to avoid the bug above.
-        /*
-        if (isDocumentLink(elt)) {
-          xhr.loadDocument(url, receiveXhr);
-        } else {
-          xhr.load(url, receiveXhr);
-        }
-        */
-      }
-    },
-
-    receive: function(url, elt, err, resource, redirectedUrl) {
-      this.cache[url] = resource;
-      var $p = this.pending[url];
-      for (var i=0, l=$p.length, p; (i<l) && (p=$p[i]); i++) {
-        // If url was redirected, use the redirected location so paths are
-        // calculated relative to that.
-        this.onload(url, p, resource, err, redirectedUrl);
-        this.tail();
-      }
-      this.pending[url] = null;
-    },
-
-    tail: function() {
-      --this.inflight;
-      this.checkDone();
-    },
-
-    checkDone: function() {
-      if (!this.inflight) {
-        this.oncomplete();
-      }
-    }
-
-  };
-
-  xhr = xhr || {
-    async: true,
-
-    ok: function(request) {
-      return (request.status >= 200 && request.status < 300)
-          || (request.status === 304)
-          || (request.status === 0);
-    },
-
-    load: function(url, next, nextContext) {
-      var request = new XMLHttpRequest();
-      if (scope.flags.debug || scope.flags.bust) {
-        url += '?' + Math.random();
-      }
-      request.open('GET', url, xhr.async);
-      request.addEventListener('readystatechange', function(e) {
-        if (request.readyState === 4) {
-          // Servers redirecting an import can add a Location header to help us
-          // polyfill correctly.
-          var locationHeader = request.getResponseHeader("Location");
-          var redirectedUrl = null;
-          if (locationHeader) {
-            var redirectedUrl = (locationHeader.substr( 0, 1 ) === "/")
-              ? location.origin + locationHeader  // Location is a relative path
-              : locationHeader;                    // Full path
-          }
-          next.call(nextContext, !xhr.ok(request) && request,
-              request.response || request.responseText, redirectedUrl);
-        }
-      });
-      request.send();
-      return request;
-    },
-
-    loadDocument: function(url, next, nextContext) {
-      this.load(url, next, nextContext).responseType = 'document';
-    }
-    
-  };
-
-  // exports
-  scope.xhr = xhr;
-  scope.Loader = Loader;
-
-})(window.HTMLImports);
-
-/*
- * 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(scope) {
-
-// imports
-var rootDocument = scope.rootDocument;
-var flags = scope.flags;
-var isIE = scope.isIE;
-var IMPORT_LINK_TYPE = scope.IMPORT_LINK_TYPE;
-
-// importParser
-// highlander object to manage parsing of imports
-// parses import related elements
-// and ensures proper parse order
-// parse order is enforced by crawling the tree and monitoring which elements
-// have been parsed; async parsing is also supported.
-
-// highlander object for parsing a document tree
-var importParser = {
-
-  // parse selectors for main document elements
-  documentSelectors: 'link[rel=' + IMPORT_LINK_TYPE + ']',
-
-  // parse selectors for import document elements
-  importsSelectors: [
-    'link[rel=' + IMPORT_LINK_TYPE + ']',
-    'link[rel=stylesheet]',
-    'style',
-    'script:not([type])',
-    'script[type="text/javascript"]'
-  ].join(','),
-
-  map: {
-    link: 'parseLink',
-    script: 'parseScript',
-    style: 'parseStyle'
-  },
-
-  dynamicElements: [],
-
-  // try to parse the next import in the tree
-  parseNext: function() {
-    var next = this.nextToParse();
-    if (next) {
-      this.parse(next);
-    }
-  },
-
-  parse: function(elt) {
-    if (this.isParsed(elt)) {
-      flags.parse && console.log('[%s] is already parsed', elt.localName);
-      return;
-    }
-    var fn = this[this.map[elt.localName]];
-    if (fn) {
-      this.markParsing(elt);
-      fn.call(this, elt);
-    }
-  },
-
-  parseDynamic: function(elt, quiet) {
-    this.dynamicElements.push(elt);
-    if (!quiet) {
-      this.parseNext();
-    }
-  },
-
-  // only 1 element may be parsed at a time; parsing is async so each
-  // parsing implementation must inform the system that parsing is complete
-  // via markParsingComplete.
-  // To prompt the system to parse the next element, parseNext should then be
-  // called.
-  // Note, parseNext used to be included at the end of markParsingComplete, but
-  // we must not do this so that, for example, we can (1) mark parsing complete 
-  // then (2) fire an import load event, and then (3) parse the next resource.
-  markParsing: function(elt) {
-    flags.parse && console.log('parsing', elt);
-    this.parsingElement = elt;
-  },
-
-  markParsingComplete: function(elt) {
-    elt.__importParsed = true;
-    this.markDynamicParsingComplete(elt);
-    if (elt.__importElement) {
-      elt.__importElement.__importParsed = true;
-      this.markDynamicParsingComplete(elt.__importElement);
-    }
-    this.parsingElement = null;
-    flags.parse && console.log('completed', elt);
-  },
-
-  markDynamicParsingComplete: function(elt) {
-    var i = this.dynamicElements.indexOf(elt);
-    if (i >= 0) {
-      this.dynamicElements.splice(i, 1);
-    }
-  },
-
-  parseImport: function(elt) {
-    // TODO(sorvell): consider if there's a better way to do this;
-    // expose an imports parsing hook; this is needed, for example, by the
-    // CustomElements polyfill.
-    if (HTMLImports.__importsParsingHook) {
-      HTMLImports.__importsParsingHook(elt);
-    }
-    if (elt.import) {
-      elt.import.__importParsed = true;
-    }
-    this.markParsingComplete(elt);
-    // fire load event
-    if (elt.__resource && !elt.__error) {
-      elt.dispatchEvent(new CustomEvent('load', {bubbles: false}));    
-    } else {
-      elt.dispatchEvent(new CustomEvent('error', {bubbles: false}));
-    }
-    // TODO(sorvell): workaround for Safari addEventListener not working
-    // for elements not in the main document.
-    if (elt.__pending) {
-      var fn;
-      while (elt.__pending.length) {
-        fn = elt.__pending.shift();
-        if (fn) {
-          fn({target: elt});
-        }
-      }
-    }
-    this.parseNext();
-  },
-
-  parseLink: function(linkElt) {
-    if (nodeIsImport(linkElt)) {
-      this.parseImport(linkElt);
-    } else {
-      // make href absolute
-      linkElt.href = linkElt.href;
-      this.parseGeneric(linkElt);
-    }
-  },
-
-  parseStyle: function(elt) {
-    // TODO(sorvell): style element load event can just not fire so clone styles
-    var src = elt;
-    elt = cloneStyle(elt);
-    elt.__importElement = src;
-    this.parseGeneric(elt);
-  },
-
-  parseGeneric: function(elt) {
-    this.trackElement(elt);
-    this.addElementToDocument(elt);
-  },
-
-  rootImportForElement: function(elt) {
-    var n = elt;
-    while (n.ownerDocument.__importLink) {
-      n = n.ownerDocument.__importLink;
-    }
-    return n;
-  },
-
-  addElementToDocument: function(elt) {
-    var port = this.rootImportForElement(elt.__importElement || elt);
-    var l = port.__insertedElements = port.__insertedElements || 0;
-    var refNode = port.nextElementSibling;
-    for (var i=0; i < l; i++) {
-      refNode = refNode && refNode.nextElementSibling;
-    }
-    port.parentNode.insertBefore(elt, refNode);
-  },
-
-  // tracks when a loadable element has loaded
-  trackElement: function(elt, callback) {
-    var self = this;
-    var done = function(e) {
-      if (callback) {
-        callback(e);
-      }
-      self.markParsingComplete(elt);
-      self.parseNext();
-    };
-    elt.addEventListener('load', done);
-    elt.addEventListener('error', done);
-
-    // NOTE: IE does not fire "load" event for styles that have already loaded
-    // This is in violation of the spec, so we try our hardest to work around it
-    if (isIE && elt.localName === 'style') {
-      var fakeLoad = false;
-      // If there's not @import in the textContent, assume it has loaded
-      if (elt.textContent.indexOf('@import') == -1) {
-        fakeLoad = true;
-      // if we have a sheet, we have been parsed
-      } else if (elt.sheet) {
-        fakeLoad = true;
-        var csr = elt.sheet.cssRules;
-        var len = csr ? csr.length : 0;
-        // search the rules for @import's
-        for (var i = 0, r; (i < len) && (r = csr[i]); i++) {
-          if (r.type === CSSRule.IMPORT_RULE) {
-            // if every @import has resolved, fake the load
-            fakeLoad = fakeLoad && Boolean(r.styleSheet);
-          }
-        }
-      }
-      // dispatch a fake load event and continue parsing
-      if (fakeLoad) {
-        elt.dispatchEvent(new CustomEvent('load', {bubbles: false}));
-      }
-    }
-  },
-
-  // NOTE: execute scripts by injecting them and watching for the load/error
-  // event. Inline scripts are handled via dataURL's because browsers tend to
-  // provide correct parsing errors in this case. If this has any compatibility
-  // issues, we can switch to injecting the inline script with textContent.
-  // Scripts with dataURL's do not appear to generate load events and therefore
-  // we assume they execute synchronously.
-  parseScript: function(scriptElt) {
-    var script = document.createElement('script');
-    script.__importElement = scriptElt;
-    script.src = scriptElt.src ? scriptElt.src : 
-        generateScriptDataUrl(scriptElt);
-    scope.currentScript = scriptElt;
-    this.trackElement(script, function(e) {
-      script.parentNode.removeChild(script);
-      scope.currentScript = null;  
-    });
-    this.addElementToDocument(script);
-  },
-
-  // determine the next element in the tree which should be parsed
-  nextToParse: function() {
-    this._mayParse = [];
-    return !this.parsingElement && (this.nextToParseInDoc(rootDocument) || 
-        this.nextToParseDynamic());
-  },
-
-  nextToParseInDoc: function(doc, link) {
-    // use `marParse` list to avoid looping into the same document again
-    // since it could cause an iloop.
-    if (doc && this._mayParse.indexOf(doc) < 0) {
-      this._mayParse.push(doc);
-      var nodes = doc.querySelectorAll(this.parseSelectorsForNode(doc));
-      for (var i=0, l=nodes.length, p=0, n; (i<l) && (n=nodes[i]); i++) {
-        if (!this.isParsed(n)) {
-          if (this.hasResource(n)) {
-            return nodeIsImport(n) ? this.nextToParseInDoc(n.import, n) : n;
-          } else {
-            return;
-          }
-        }
-      }
-    }
-    // all nodes have been parsed, ready to parse import, if any
-    return link;
-  },
-
-  nextToParseDynamic: function() {
-    return this.dynamicElements[0];
-  },
-
-  // return the set of parse selectors relevant for this node.
-  parseSelectorsForNode: function(node) {
-    var doc = node.ownerDocument || node;
-    return doc === rootDocument ? this.documentSelectors :
-        this.importsSelectors;
-  },
-
-  isParsed: function(node) {
-    return node.__importParsed;
-  },
-
-  needsDynamicParsing: function(elt) {
-    return (this.dynamicElements.indexOf(elt) >= 0);
-  },
-
-  hasResource: function(node) {
-    if (nodeIsImport(node) && (node.import === undefined)) {
-      return false;
-    }
-    return true;
-  }
-
-};
-
-function nodeIsImport(elt) {
-  return (elt.localName === 'link') && (elt.rel === IMPORT_LINK_TYPE);
-}
-
-function generateScriptDataUrl(script) {
-  var scriptContent = generateScriptContent(script);
-  return 'data:text/javascript;charset=utf-8,' + encodeURIComponent(scriptContent);
-}
-
-function generateScriptContent(script) {
-  return script.textContent + generateSourceMapHint(script);
-}
-
-// calculate source map hint
-function generateSourceMapHint(script) {
-  var moniker = script.__nodeUrl;
-  if (!moniker) {
-    moniker = script.ownerDocument.baseURI;
-    // there could be more than one script this url
-    var tag = '[' + Math.floor((Math.random()+1)*1000) + ']';
-    // TODO(sjmiles): Polymer hack, should be pluggable if we need to allow 
-    // this sort of thing
-    var matches = script.textContent.match(/Polymer\(['"]([^'"]*)/);
-    tag = matches && matches[1] || tag;
-    // tag the moniker
-    moniker += '/' + tag + '.js';
-  }
-  return '\n//# sourceURL=' + moniker + '\n';
-}
-
-// style/stylesheet handling
-
-// clone style with proper path resolution for main document
-// NOTE: styles are the only elements that require direct path fixup.
-function cloneStyle(style) {
-  var clone = style.ownerDocument.createElement('style');
-  clone.textContent = style.textContent;
-  path.resolveUrlsInStyle(clone);
-  return clone;
-}
-
-// path fixup: style elements in imports must be made relative to the main 
-// document. We fixup url's in url() and @import.
-var CSS_URL_REGEXP = /(url\()([^)]*)(\))/g;
-var CSS_IMPORT_REGEXP = /(@import[\s]+(?!url\())([^;]*)(;)/g;
-
-var path = {
-
-  resolveUrlsInStyle: function(style) {
-    var doc = style.ownerDocument;
-    var resolver = doc.createElement('a');
-    style.textContent = this.resolveUrlsInCssText(style.textContent, resolver);
-    return style;  
-  },
-
-  resolveUrlsInCssText: function(cssText, urlObj) {
-    var r = this.replaceUrls(cssText, urlObj, CSS_URL_REGEXP);
-    r = this.replaceUrls(r, urlObj, CSS_IMPORT_REGEXP);
-    return r;
-  },
-
-  replaceUrls: function(text, urlObj, regexp) {
-    return text.replace(regexp, function(m, pre, url, post) {
-      var urlPath = url.replace(/["']/g, '');
-      urlObj.href = urlPath;
-      urlPath = urlObj.href;
-      return pre + '\'' + urlPath + '\'' + post;
-    });    
-  }
-
-};
-
-// exports
-scope.parser = importParser;
-scope.path = path;
-
-})(HTMLImports);
-
-/*
- * 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(scope) {
-
-// imports
-var useNative = scope.useNative;
-var flags = scope.flags;
-var IMPORT_LINK_TYPE = scope.IMPORT_LINK_TYPE;
-
-if (!useNative) {
-
-  // imports
-  var rootDocument = scope.rootDocument;
-  var xhr = scope.xhr;
-  var Loader = scope.Loader;
-  var parser = scope.parser;
-
-  // importer
-  // highlander object to manage loading of imports
-
-  // for any document, importer:
-  // - loads any linked import documents (with deduping)
-
-  var importer = {
-
-    documents: {},
-    
-    // nodes to load in the mian document
-    documentPreloadSelectors: 'link[rel=' + IMPORT_LINK_TYPE + ']',
-    
-    // nodes to load in imports
-    importsPreloadSelectors: [
-      'link[rel=' + IMPORT_LINK_TYPE + ']'
-    ].join(','),
-    
-    loadNode: function(node) {
-      importLoader.addNode(node);
-    },
-    
-    // load all loadable elements within the parent element
-    loadSubtree: function(parent) {
-      var nodes = this.marshalNodes(parent);
-      // add these nodes to loader's queue
-      importLoader.addNodes(nodes);
-    },
-    
-    marshalNodes: function(parent) {
-      // all preloadable nodes in inDocument
-      return parent.querySelectorAll(this.loadSelectorsForNode(parent));
-    },
-    
-    // find the proper set of load selectors for a given node
-    loadSelectorsForNode: function(node) {
-      var doc = node.ownerDocument || node;
-      return doc === rootDocument ? this.documentPreloadSelectors :
-          this.importsPreloadSelectors;
-    },
-    
-    loaded: function(url, elt, resource, err, redirectedUrl) {
-      flags.load && console.log('loaded', url, elt);
-      // store generic resource
-      // TODO(sorvell): fails for nodes inside <template>.content
-      // see https://code.google.com/p/chromium/issues/detail?id=249381.
-      elt.__resource = resource;
-      elt.__error = err;
-      if (isDocumentLink(elt)) {
-        var doc = this.documents[url];
-        // if we've never seen a document at this url
-        if (doc === undefined) {
-          // generate an HTMLDocument from data
-          doc = err ? null : makeDocument(resource, redirectedUrl || url);
-          if (doc) {
-            doc.__importLink = elt;
-            // note, we cannot use MO to detect parsed nodes because
-            // SD polyfill does not report these as mutations.
-            this.bootDocument(doc);
-          }
-          // cache document
-          this.documents[url] = doc;
-        }
-        // don't store import record until we're actually loaded
-        // store document resource
-        elt.import = doc;
-      }
-      parser.parseNext();
-    },
-    
-    bootDocument: function(doc) {
-      this.loadSubtree(doc);
-      this.observe(doc);
-      parser.parseNext();
-    },
-    
-    loadedAll: function() {
-      parser.parseNext();
-    }
-
-  };
-
-  // loader singleton
-  var importLoader = new Loader(importer.loaded.bind(importer), 
-      importer.loadedAll.bind(importer));
-
-  function isDocumentLink(elt) {
-    return isLinkRel(elt, IMPORT_LINK_TYPE);
-  }
-
-  function isLinkRel(elt, rel) {
-    return elt.localName === 'link' && elt.getAttribute('rel') === rel;
-  }
-
-  function isScript(elt) {
-    return elt.localName === 'script';
-  }
-
-  function makeDocument(resource, url) {
-    // create a new HTML document
-    var doc = resource;
-    if (!(doc instanceof Document)) {
-      doc = document.implementation.createHTMLDocument(IMPORT_LINK_TYPE);
-    }
-    // cache the new document's source url
-    doc._URL = url;
-    // establish a relative path via <base>
-    var base = doc.createElement('base');
-    base.setAttribute('href', url);
-    // add baseURI support to browsers (IE) that lack it.
-    if (!doc.baseURI) {
-      doc.baseURI = url;
-    }
-    // ensure UTF-8 charset
-    var meta = doc.createElement('meta');
-    meta.setAttribute('charset', 'utf-8');
-
-    doc.head.appendChild(meta);
-    doc.head.appendChild(base);
-    // install HTML last as it may trigger CustomElement upgrades
-    // TODO(sjmiles): problem wrt to template boostrapping below,
-    // template bootstrapping must (?) come before element upgrade
-    // but we cannot bootstrap templates until they are in a document
-    // which is too late
-    if (!(resource instanceof Document)) {
-      // install html
-      doc.body.innerHTML = resource;
-    }
-    // TODO(sorvell): ideally this code is not aware of Template polyfill,
-    // but for now the polyfill needs help to bootstrap these templates
-    if (window.HTMLTemplateElement && HTMLTemplateElement.bootstrap) {
-      HTMLTemplateElement.bootstrap(doc);
-    }
-    return doc;
-  }
-
-  // Polyfill document.baseURI for browsers without it.
-  if (!document.baseURI) {
-    var baseURIDescriptor = {
-      get: function() {
-        var base = document.querySelector('base');
-        return base ? base.href : window.location.href;
-      },
-      configurable: true
-    };
-
-    Object.defineProperty(document, 'baseURI', baseURIDescriptor);
-    Object.defineProperty(rootDocument, 'baseURI', baseURIDescriptor);
-  }
-
-  // IE shim for CustomEvent
-  if (typeof window.CustomEvent !== 'function') {
-    window.CustomEvent = function(inType, dictionary) {
-       var e = document.createEvent('HTMLEvents');
-       e.initEvent(inType,
-          dictionary.bubbles === false ? false : true,
-          dictionary.cancelable === false ? false : true,
-          dictionary.detail);
-       return e;
-    };
-  }
-
-} else {
-  // do nothing if using native imports
-  var importer = {};
-}
-
-// exports
-scope.importer = importer;
-scope.IMPORT_LINK_TYPE = IMPORT_LINK_TYPE;
-scope.importLoader = importLoader;
-
-})(window.HTMLImports);
-
-/*
- * 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(scope){
-
-// imports
-var IMPORT_LINK_TYPE = scope.IMPORT_LINK_TYPE;
-var importer = scope.importer;
-var parser = scope.parser;
-
-var importSelector = 'link[rel=' + IMPORT_LINK_TYPE + ']';
-
-
-// we track mutations for addedNodes, looking for imports
-function handler(mutations) {
-  for (var i=0, l=mutations.length, m; (i<l) && (m=mutations[i]); i++) {
-    if (m.type === 'childList' && m.addedNodes.length) {
-      addedNodes(m.addedNodes);
-    }
-  }
-}
-
-// find loadable elements and add them to the importer
-// IFF the owning document has already parsed, then parsable elements
-// need to be marked for dynamic parsing.
-function addedNodes(nodes) {
-  var owner, parsed;
-  for (var i=0, l=nodes.length, n, loading; (i<l) && (n=nodes[i]); i++) {
-    if (!owner) {
-      owner = n.ownerDocument;
-      parsed = parser.isParsed(owner);
-    }
-    // note: the act of loading kicks the parser, so we use parseDynamic's
-    // 2nd argument to control if this added node needs to kick the parser.
-    loading = shouldLoadNode(n);
-    if (loading) {
-      importer.loadNode(n);
-    }
-    if (shouldParseNode(n) && parsed) {
-      parser.parseDynamic(n, loading);
-    }
-    if (n.children && n.children.length) {
-      addedNodes(n.children);
-    }
-  }
-}
-
-function shouldLoadNode(node) {
-  return (node.nodeType === 1) && matches.call(node,
-      importer.loadSelectorsForNode(node));
-}
-
-function shouldParseNode(node) {
-  return (node.nodeType === 1) && matches.call(node,
-      parser.parseSelectorsForNode(node));  
-}
-
-// x-plat matches
-var matches = HTMLElement.prototype.matches || 
-    HTMLElement.prototype.matchesSelector || 
-    HTMLElement.prototype.webkitMatchesSelector ||
-    HTMLElement.prototype.mozMatchesSelector ||
-    HTMLElement.prototype.msMatchesSelector;
-
-var observer = new MutationObserver(handler);
-
-// observe the given root for loadable elements
-function observe(root) {
-  observer.observe(root, {childList: true, subtree: true});
-}
-
-// exports
-// TODO(sorvell): factor so can put on scope
-scope.observe = observe;
-importer.observe = observe;
-
-})(HTMLImports);
-
-/*
- * 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(){
-
-// bootstrap
-
-// TODO(sorvell): SD polyfill intrusion
-var doc = window.ShadowDOMPolyfill ? 
-    window.ShadowDOMPolyfill.wrapIfNeeded(document) : document;
-
-// no need to bootstrap the polyfill when native imports is available.
-if (!HTMLImports.useNative) {
-  function bootstrap() {
-    HTMLImports.importer.bootDocument(doc);
-  }
-    
-  // TODO(sorvell): SD polyfill does *not* generate mutations for nodes added
-  // by the parser. For this reason, we must wait until the dom exists to 
-  // bootstrap.
-  if (document.readyState === 'complete' ||
-      (document.readyState === 'interactive' && !window.attachEvent)) {
-    bootstrap();
-  } else {
-    document.addEventListener('DOMContentLoaded', bootstrap);
-  }
-}
-
-})();
-
-/*
- * 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
- */
-window.CustomElements = window.CustomElements || {flags:{}};
-/*
- * 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(scope){
-
-var logFlags = window.logFlags || {};
-var IMPORT_LINK_TYPE = window.HTMLImports ? HTMLImports.IMPORT_LINK_TYPE : 'none';
-
-// walk the subtree rooted at node, applying 'find(element, data)' function
-// to each element
-// if 'find' returns true for 'element', do not search element's subtree
-function findAll(node, find, data) {
-  var e = node.firstElementChild;
-  if (!e) {
-    e = node.firstChild;
-    while (e && e.nodeType !== Node.ELEMENT_NODE) {
-      e = e.nextSibling;
-    }
-  }
-  while (e) {
-    if (find(e, data) !== true) {
-      findAll(e, find, data);
-    }
-    e = e.nextElementSibling;
-  }
-  return null;
-}
-
-// walk all shadowRoots on a given node.
-function forRoots(node, cb) {
-  var root = node.shadowRoot;
-  while(root) {
-    forSubtree(root, cb);
-    root = root.olderShadowRoot;
-  }
-}
-
-// walk the subtree rooted at node, including descent into shadow-roots,
-// applying 'cb' to each element
-function forSubtree(node, cb) {
-  //logFlags.dom && node.childNodes && node.childNodes.length && console.group('subTree: ', node);
-  findAll(node, function(e) {
-    if (cb(e)) {
-      return true;
-    }
-    forRoots(e, cb);
-  });
-  forRoots(node, cb);
-  //logFlags.dom && node.childNodes && node.childNodes.length && console.groupEnd();
-}
-
-// manage lifecycle on added node
-function added(node) {
-  if (upgrade(node)) {
-    insertedNode(node);
-    return true;
-  }
-  inserted(node);
-}
-
-// manage lifecycle on added node's subtree only
-function addedSubtree(node) {
-  forSubtree(node, function(e) {
-    if (added(e)) {
-      return true;
-    }
-  });
-}
-
-// manage lifecycle on added node and it's subtree
-function addedNode(node) {
-  return added(node) || addedSubtree(node);
-}
-
-// upgrade custom elements at node, if applicable
-function upgrade(node) {
-  if (!node.__upgraded__ && node.nodeType === Node.ELEMENT_NODE) {
-    var type = node.getAttribute('is') || node.localName;
-    var definition = scope.registry[type];
-    if (definition) {
-      logFlags.dom && console.group('upgrade:', node.localName);
-      scope.upgrade(node);
-      logFlags.dom && console.groupEnd();
-      return true;
-    }
-  }
-}
-
-function insertedNode(node) {
-  inserted(node);
-  if (inDocument(node)) {
-    forSubtree(node, function(e) {
-      inserted(e);
-    });
-  }
-}
-
-// TODO(sorvell): on platforms without MutationObserver, mutations may not be
-// reliable and therefore attached/detached are not reliable.
-// To make these callbacks less likely to fail, we defer all inserts and removes
-// to give a chance for elements to be inserted into dom.
-// This ensures attachedCallback fires for elements that are created and
-// immediately added to dom.
-var hasPolyfillMutations = (!window.MutationObserver ||
-    (window.MutationObserver === window.JsMutationObserver));
-scope.hasPolyfillMutations = hasPolyfillMutations;
-
-var isPendingMutations = false;
-var pendingMutations = [];
-function deferMutation(fn) {
-  pendingMutations.push(fn);
-  if (!isPendingMutations) {
-    isPendingMutations = true;
-    var async = (window.Platform && window.Platform.endOfMicrotask) ||
-        setTimeout;
-    async(takeMutations);
-  }
-}
-
-function takeMutations() {
-  isPendingMutations = false;
-  var $p = pendingMutations;
-  for (var i=0, l=$p.length, p; (i<l) && (p=$p[i]); i++) {
-    p();
-  }
-  pendingMutations = [];
-}
-
-function inserted(element) {
-  if (hasPolyfillMutations) {
-    deferMutation(function() {
-      _inserted(element);
-    });
-  } else {
-    _inserted(element);
-  }
-}
-
-// TODO(sjmiles): if there are descents into trees that can never have inDocument(*) true, fix this
-function _inserted(element) {
-  // TODO(sjmiles): it's possible we were inserted and removed in the space
-  // of one microtask, in which case we won't be 'inDocument' here
-  // But there are other cases where we are testing for inserted without
-  // specific knowledge of mutations, and must test 'inDocument' to determine
-  // whether to call inserted
-  // If we can factor these cases into separate code paths we can have
-  // better diagnostics.
-  // TODO(sjmiles): when logging, do work on all custom elements so we can
-  // track behavior even when callbacks not defined
-  //console.log('inserted: ', element.localName);
-  if (element.attachedCallback || element.detachedCallback || (element.__upgraded__ && logFlags.dom)) {
-    logFlags.dom && console.group('inserted:', element.localName);
-    if (inDocument(element)) {
-      element.__inserted = (element.__inserted || 0) + 1;
-      // if we are in a 'removed' state, bluntly adjust to an 'inserted' state
-      if (element.__inserted < 1) {
-        element.__inserted = 1;
-      }
-      // if we are 'over inserted', squelch the callback
-      if (element.__inserted > 1) {
-        logFlags.dom && console.warn('inserted:', element.localName,
-          'insert/remove count:', element.__inserted)
-      } else if (element.attachedCallback) {
-        logFlags.dom && console.log('inserted:', element.localName);
-        element.attachedCallback();
-      }
-    }
-    logFlags.dom && console.groupEnd();
-  }
-}
-
-function removedNode(node) {
-  removed(node);
-  forSubtree(node, function(e) {
-    removed(e);
-  });
-}
-
-function removed(element) {
-  if (hasPolyfillMutations) {
-    deferMutation(function() {
-      _removed(element);
-    });
-  } else {
-    _removed(element);
-  }
-}
-
-function _removed(element) {
-  // TODO(sjmiles): temporary: do work on all custom elements so we can track
-  // behavior even when callbacks not defined
-  if (element.attachedCallback || element.detachedCallback || (element.__upgraded__ && logFlags.dom)) {
-    logFlags.dom && console.group('removed:', element.localName);
-    if (!inDocument(element)) {
-      element.__inserted = (element.__inserted || 0) - 1;
-      // if we are in a 'inserted' state, bluntly adjust to an 'removed' state
-      if (element.__inserted > 0) {
-        element.__inserted = 0;
-      }
-      // if we are 'over removed', squelch the callback
-      if (element.__inserted < 0) {
-        logFlags.dom && console.warn('removed:', element.localName,
-            'insert/remove count:', element.__inserted)
-      } else if (element.detachedCallback) {
-        element.detachedCallback();
-      }
-    }
-    logFlags.dom && console.groupEnd();
-  }
-}
-
-// SD polyfill intrustion due mainly to the fact that 'document'
-// is not entirely wrapped
-function wrapIfNeeded(node) {
-  return window.ShadowDOMPolyfill ? ShadowDOMPolyfill.wrapIfNeeded(node)
-      : node;
-}
-
-function inDocument(element) {
-  var p = element;
-  var doc = wrapIfNeeded(document);
-  while (p) {
-    if (p == doc) {
-      return true;
-    }
-    p = p.parentNode || p.host;
-  }
-}
-
-function watchShadow(node) {
-  if (node.shadowRoot && !node.shadowRoot.__watched) {
-    logFlags.dom && console.log('watching shadow-root for: ', node.localName);
-    // watch all unwatched roots...
-    var root = node.shadowRoot;
-    while (root) {
-      watchRoot(root);
-      root = root.olderShadowRoot;
-    }
-  }
-}
-
-function watchRoot(root) {
-  observe(root);
-}
-
-function handler(mutations) {
-  //
-  if (logFlags.dom) {
-    var mx = mutations[0];
-    if (mx && mx.type === 'childList' && mx.addedNodes) {
-        if (mx.addedNodes) {
-          var d = mx.addedNodes[0];
-          while (d && d !== document && !d.host) {
-            d = d.parentNode;
-          }
-          var u = d && (d.URL || d._URL || (d.host && d.host.localName)) || '';
-          u = u.split('/?').shift().split('/').pop();
-        }
-    }
-    console.group('mutations (%d) [%s]', mutations.length, u || '');
-  }
-  //
-  mutations.forEach(function(mx) {
-    //logFlags.dom && console.group('mutation');
-    if (mx.type === 'childList') {
-      forEach(mx.addedNodes, function(n) {
-        //logFlags.dom && console.log(n.localName);
-        if (!n.localName) {
-          return;
-        }
-        // nodes added may need lifecycle management
-        addedNode(n);
-      });
-      // removed nodes may need lifecycle management
-      forEach(mx.removedNodes, function(n) {
-        //logFlags.dom && console.log(n.localName);
-        if (!n.localName) {
-          return;
-        }
-        removedNode(n);
-      });
-    }
-    //logFlags.dom && console.groupEnd();
-  });
-  logFlags.dom && console.groupEnd();
-};
-
-function takeRecords(node) {
-  // If the optional node is not supplied, assume we mean the whole document.
-  if (!node) node = wrapIfNeeded(document);
-
-  // Find the root of the tree, which will be an Document or ShadowRoot.
-  while (node.parentNode) {
-    node = node.parentNode;
-  }
-
-  var observer = node.__observer;
-  if (observer) {
-    handler(observer.takeRecords());
-    takeMutations();
-  }
-}
-
-var forEach = Array.prototype.forEach.call.bind(Array.prototype.forEach);
-
-function observe(inRoot) {
-  if (inRoot.__observer) return;
-
-  // For each ShadowRoot, we create a new MutationObserver, so the root can be
-  // garbage collected once all references to the `inRoot` node are gone.
-  var observer = new MutationObserver(handler);
-  observer.observe(inRoot, {childList: true, subtree: true});
-  inRoot.__observer = observer;
-}
-
-function observeDocument(doc) {
-  observe(doc);
-}
-
-function upgradeDocument(doc) {
-  logFlags.dom && console.group('upgradeDocument: ', (doc.baseURI).split('/').pop());
-  addedNode(doc);
-  logFlags.dom && console.groupEnd();
-}
-
-/*
-This method is intended to be called when the document tree (including imports)
-has pending custom elements to upgrade. It can be called multiple times and 
-should do nothing if no elements are in need of upgrade.
-
-Note that the import tree can consume itself and therefore special care
-must be taken to avoid recursion.
-*/
-var upgradedDocuments;
-function upgradeDocumentTree(doc) {
-  upgradedDocuments = [];
-  _upgradeDocumentTree(doc);
-  upgradedDocuments = null;
-}
-
-
-function _upgradeDocumentTree(doc) {
-  doc = wrapIfNeeded(doc);
-  if (upgradedDocuments.indexOf(doc) >= 0) {
-    return;
-  }
-  upgradedDocuments.push(doc);
-  //console.log('upgradeDocumentTree: ', (doc.baseURI).split('/').pop());
-  // upgrade contained imported documents
-  var imports = doc.querySelectorAll('link[rel=' + IMPORT_LINK_TYPE + ']');
-  for (var i=0, l=imports.length, n; (i<l) && (n=imports[i]); i++) {
-    if (n.import && n.import.__parsed) {
-      _upgradeDocumentTree(n.import);
-    }
-  }
-  upgradeDocument(doc);
-}
-
-// exports
-scope.IMPORT_LINK_TYPE = IMPORT_LINK_TYPE;
-scope.watchShadow = watchShadow;
-scope.upgradeDocumentTree = upgradeDocumentTree;
-scope.upgradeAll = addedNode;
-scope.upgradeSubtree = addedSubtree;
-scope.insertedNode = insertedNode;
-
-scope.observeDocument = observeDocument;
-scope.upgradeDocument = upgradeDocument;
-
-scope.takeRecords = takeRecords;
-
-})(window.CustomElements);
-
-/*
- * 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
- */
-
-/**
- * Implements `document.registerElement`
- * @module CustomElements
-*/
-
-/**
- * Polyfilled extensions to the `document` object.
- * @class Document
-*/
-
-(function(scope) {
-
-// imports
-
-if (!scope) {
-  scope = window.CustomElements = {flags:{}};
-}
-var flags = scope.flags;
-
-// native document.registerElement?
-
-var hasNative = Boolean(document.registerElement);
-// For consistent timing, use native custom elements only when not polyfilling
-// other key related web components features.
-var useNative = !flags.register && hasNative && !window.ShadowDOMPolyfill && (!window.HTMLImports || HTMLImports.useNative);
-
-if (useNative) {
-
-  // stub
-  var nop = function() {};
-
-  // exports
-  scope.registry = {};
-  scope.upgradeElement = nop;
-
-  scope.watchShadow = nop;
-  scope.upgrade = nop;
-  scope.upgradeAll = nop;
-  scope.upgradeSubtree = nop;
-  scope.observeDocument = nop;
-  scope.upgradeDocument = nop;
-  scope.upgradeDocumentTree = nop;
-  scope.takeRecords = nop;
-  scope.reservedTagList = [];
-
-} else {
-
-  /**
-   * Registers a custom tag name with the document.
-   *
-   * When a registered element is created, a `readyCallback` method is called
-   * in the scope of the element. The `readyCallback` method can be specified on
-   * either `options.prototype` or `options.lifecycle` with the latter taking
-   * precedence.
-   *
-   * @method register
-   * @param {String} name The tag name to register. Must include a dash ('-'),
-   *    for example 'x-component'.
-   * @param {Object} options
-   *    @param {String} [options.extends]
-   *      (_off spec_) Tag name of an element to extend (or blank for a new
-   *      element). This parameter is not part of the specification, but instead
-   *      is a hint for the polyfill because the extendee is difficult to infer.
-   *      Remember that the input prototype must chain to the extended element's
-   *      prototype (or HTMLElement.prototype) regardless of the value of
-   *      `extends`.
-   *    @param {Object} options.prototype The prototype to use for the new
-   *      element. The prototype must inherit from HTMLElement.
-   *    @param {Object} [options.lifecycle]
-   *      Callbacks that fire at important phases in the life of the custom
-   *      element.
-   *
-   * @example
-   *      FancyButton = document.registerElement("fancy-button", {
-   *        extends: 'button',
-   *        prototype: Object.create(HTMLButtonElement.prototype, {
-   *          readyCallback: {
-   *            value: function() {
-   *              console.log("a fancy-button was created",
-   *            }
-   *          }
-   *        })
-   *      });
-   * @return {Function} Constructor for the newly registered type.
-   */
-  function register(name, options) {
-    //console.warn('document.registerElement("' + name + '", ', options, ')');
-    // construct a defintion out of options
-    // TODO(sjmiles): probably should clone options instead of mutating it
-    var definition = options || {};
-    if (!name) {
-      // TODO(sjmiles): replace with more appropriate error (EricB can probably
-      // offer guidance)
-      throw new Error('document.registerElement: first argument `name` must not be empty');
-    }
-    if (name.indexOf('-') < 0) {
-      // TODO(sjmiles): replace with more appropriate error (EricB can probably
-      // offer guidance)
-      throw new Error('document.registerElement: first argument (\'name\') must contain a dash (\'-\'). Argument provided was \'' + String(name) + '\'.');
-    }
-    // prevent registering reserved names
-    if (isReservedTag(name)) {
-      throw new Error('Failed to execute \'registerElement\' on \'Document\': Registration failed for type \'' + String(name) + '\'. The type name is invalid.');
-    }
-    // elements may only be registered once
-    if (getRegisteredDefinition(name)) {
-      throw new Error('DuplicateDefinitionError: a type with name \'' + String(name) + '\' is already registered');
-    }
-    // must have a prototype, default to an extension of HTMLElement
-    // TODO(sjmiles): probably should throw if no prototype, check spec
-    if (!definition.prototype) {
-      // TODO(sjmiles): replace with more appropriate error (EricB can probably
-      // offer guidance)
-      throw new Error('Options missing required prototype property');
-    }
-    // record name
-    definition.__name = name.toLowerCase();
-    // ensure a lifecycle object so we don't have to null test it
-    definition.lifecycle = definition.lifecycle || {};
-    // build a list of ancestral custom elements (for native base detection)
-    // TODO(sjmiles): we used to need to store this, but current code only
-    // uses it in 'resolveTagName': it should probably be inlined
-    definition.ancestry = ancestry(definition.extends);
-    // extensions of native specializations of HTMLElement require localName
-    // to remain native, and use secondary 'is' specifier for extension type
-    resolveTagName(definition);
-    // some platforms require modifications to the user-supplied prototype
-    // chain
-    resolvePrototypeChain(definition);
-    // overrides to implement attributeChanged callback
-    overrideAttributeApi(definition.prototype);
-    // 7.1.5: Register the DEFINITION with DOCUMENT
-    registerDefinition(definition.__name, definition);
-    // 7.1.7. Run custom element constructor generation algorithm with PROTOTYPE
-    // 7.1.8. Return the output of the previous step.
-    definition.ctor = generateConstructor(definition);
-    definition.ctor.prototype = definition.prototype;
-    // force our .constructor to be our actual constructor
-    definition.prototype.constructor = definition.ctor;
-    // if initial parsing is complete
-    if (scope.ready) {
-      // upgrade any pre-existing nodes of this type
-      scope.upgradeDocumentTree(document);
-    }
-    return definition.ctor;
-  }
-
-  function isReservedTag(name) {
-    for (var i = 0; i < reservedTagList.length; i++) {
-      if (name === reservedTagList[i]) {
-        return true;
-      }
-    }
-  }
-
-  var reservedTagList = [
-    'annotation-xml', 'color-profile', 'font-face', 'font-face-src',
-    'font-face-uri', 'font-face-format', 'font-face-name', 'missing-glyph'
-  ];
-
-  function ancestry(extnds) {
-    var extendee = getRegisteredDefinition(extnds);
-    if (extendee) {
-      return ancestry(extendee.extends).concat([extendee]);
-    }
-    return [];
-  }
-
-  function resolveTagName(definition) {
-    // if we are explicitly extending something, that thing is our
-    // baseTag, unless it represents a custom component
-    var baseTag = definition.extends;
-    // if our ancestry includes custom components, we only have a
-    // baseTag if one of them does
-    for (var i=0, a; (a=definition.ancestry[i]); i++) {
-      baseTag = a.is && a.tag;
-    }
-    // our tag is our baseTag, if it exists, and otherwise just our name
-    definition.tag = baseTag || definition.__name;
-    if (baseTag) {
-      // if there is a base tag, use secondary 'is' specifier
-      definition.is = definition.__name;
-    }
-  }
-
-  function resolvePrototypeChain(definition) {
-    // if we don't support __proto__ we need to locate the native level
-    // prototype for precise mixing in
-    if (!Object.__proto__) {
-      // default prototype
-      var nativePrototype = HTMLElement.prototype;
-      // work out prototype when using type-extension
-      if (definition.is) {
-        var inst = document.createElement(definition.tag);
-        var expectedPrototype = Object.getPrototypeOf(inst);
-        // only set nativePrototype if it will actually appear in the definition's chain
-        if (expectedPrototype === definition.prototype) {
-          nativePrototype = expectedPrototype;
-        }
-      }
-      // ensure __proto__ reference is installed at each point on the prototype
-      // chain.
-      // NOTE: On platforms without __proto__, a mixin strategy is used instead
-      // of prototype swizzling. In this case, this generated __proto__ provides
-      // limited support for prototype traversal.
-      var proto = definition.prototype, ancestor;
-      while (proto && (proto !== nativePrototype)) {
-        ancestor = Object.getPrototypeOf(proto);
-        proto.__proto__ = ancestor;
-        proto = ancestor;
-      }
-      // cache this in case of mixin
-      definition.native = nativePrototype;
-    }
-  }
-
-  // SECTION 4
-
-  function instantiate(definition) {
-    // 4.a.1. Create a new object that implements PROTOTYPE
-    // 4.a.2. Let ELEMENT by this new object
-    //
-    // the custom element instantiation algorithm must also ensure that the
-    // output is a valid DOM element with the proper wrapper in place.
-    //
-    return upgrade(domCreateElement(definition.tag), definition);
-  }
-
-  function upgrade(element, definition) {
-    // some definitions specify an 'is' attribute
-    if (definition.is) {
-      element.setAttribute('is', definition.is);
-    }
-    // make 'element' implement definition.prototype
-    implement(element, definition);
-    // flag as upgraded
-    element.__upgraded__ = true;
-    // lifecycle management
-    created(element);
-    // attachedCallback fires in tree order, call before recursing
-    scope.insertedNode(element);
-    // there should never be a shadow root on element at this point
-    scope.upgradeSubtree(element);
-    // OUTPUT
-    return element;
-  }
-
-  function implement(element, definition) {
-    // prototype swizzling is best
-    if (Object.__proto__) {
-      element.__proto__ = definition.prototype;
-    } else {
-      // where above we can re-acquire inPrototype via
-      // getPrototypeOf(Element), we cannot do so when
-      // we use mixin, so we install a magic reference
-      customMixin(element, definition.prototype, definition.native);
-      element.__proto__ = definition.prototype;
-    }
-  }
-
-  function customMixin(inTarget, inSrc, inNative) {
-    // TODO(sjmiles): 'used' allows us to only copy the 'youngest' version of
-    // any property. This set should be precalculated. We also need to
-    // consider this for supporting 'super'.
-    var used = {};
-    // start with inSrc
-    var p = inSrc;
-    // The default is HTMLElement.prototype, so we add a test to avoid mixing in
-    // native prototypes
-    while (p !== inNative && p !== HTMLElement.prototype) {
-      var keys = Object.getOwnPropertyNames(p);
-      for (var i=0, k; k=keys[i]; i++) {
-        if (!used[k]) {
-          Object.defineProperty(inTarget, k,
-              Object.getOwnPropertyDescriptor(p, k));
-          used[k] = 1;
-        }
-      }
-      p = Object.getPrototypeOf(p);
-    }
-  }
-
-  function created(element) {
-    // invoke createdCallback
-    if (element.createdCallback) {
-      element.createdCallback();
-    }
-  }
-
-  // attribute watching
-
-  function overrideAttributeApi(prototype) {
-    // overrides to implement callbacks
-    // TODO(sjmiles): should support access via .attributes NamedNodeMap
-    // TODO(sjmiles): preserves user defined overrides, if any
-    if (prototype.setAttribute._polyfilled) {
-      return;
-    }
-    var setAttribute = prototype.setAttribute;
-    prototype.setAttribute = function(name, value) {
-      changeAttribute.call(this, name, value, setAttribute);
-    }
-    var removeAttribute = prototype.removeAttribute;
-    prototype.removeAttribute = function(name) {
-      changeAttribute.call(this, name, null, removeAttribute);
-    }
-    prototype.setAttribute._polyfilled = true;
-  }
-
-  // https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/custom/
-  // index.html#dfn-attribute-changed-callback
-  function changeAttribute(name, value, operation) {
-    name = name.toLowerCase();
-    var oldValue = this.getAttribute(name);
-    operation.apply(this, arguments);
-    var newValue = this.getAttribute(name);
-    if (this.attributeChangedCallback
-        && (newValue !== oldValue)) {
-      this.attributeChangedCallback(name, oldValue, newValue);
-    }
-  }
-
-  // element registry (maps tag names to definitions)
-
-  var registry = {};
-
-  function getRegisteredDefinition(name) {
-    if (name) {
-      return registry[name.toLowerCase()];
-    }
-  }
-
-  function registerDefinition(name, definition) {
-    registry[name] = definition;
-  }
-
-  function generateConstructor(definition) {
-    return function() {
-      return instantiate(definition);
-    };
-  }
-
-  var HTML_NAMESPACE = 'http://www.w3.org/1999/xhtml';
-  function createElementNS(namespace, tag, typeExtension) {
-    // NOTE: we do not support non-HTML elements,
-    // just call createElementNS for non HTML Elements
-    if (namespace === HTML_NAMESPACE) {
-      return createElement(tag, typeExtension);
-    } else {
-      return domCreateElementNS(namespace, tag);
-    }
-  }
-
-  function createElement(tag, typeExtension) {
-    // TODO(sjmiles): ignore 'tag' when using 'typeExtension', we could
-    // error check it, or perhaps there should only ever be one argument
-    var definition = getRegisteredDefinition(typeExtension || tag);
-    if (definition) {
-      if (tag == definition.tag && typeExtension == definition.is) {
-        return new definition.ctor();
-      }
-      // Handle empty string for type extension.
-      if (!typeExtension && !definition.is) {
-        return new definition.ctor();
-      }
-    }
-
-    if (typeExtension) {
-      var element = createElement(tag);
-      element.setAttribute('is', typeExtension);
-      return element;
-    }
-    var element = domCreateElement(tag);
-    // Custom tags should be HTMLElements even if not upgraded.
-    if (tag.indexOf('-') >= 0) {
-      implement(element, HTMLElement);
-    }
-    return element;
-  }
-
-  function upgradeElement(element) {
-    if (!element.__upgraded__ && (element.nodeType === Node.ELEMENT_NODE)) {
-      var is = element.getAttribute('is');
-      var definition = getRegisteredDefinition(is || element.localName);
-      if (definition) {
-        if (is && definition.tag == element.localName) {
-          return upgrade(element, definition);
-        } else if (!is && !definition.extends) {
-          return upgrade(element, definition);
-        }
-      }
-    }
-  }
-
-  function cloneNode(deep) {
-    // call original clone
-    var n = domCloneNode.call(this, deep);
-    // upgrade the element and subtree
-    scope.upgradeAll(n);
-    // return the clone
-    return n;
-  }
-  // capture native createElement before we override it
-
-  var domCreateElement = document.createElement.bind(document);
-  var domCreateElementNS = document.createElementNS.bind(document);
-
-  // capture native cloneNode before we override it
-
-  var domCloneNode = Node.prototype.cloneNode;
-
-  // exports
-
-  document.registerElement = register;
-  document.createElement = createElement; // override
-  document.createElementNS = createElementNS; // override
-  Node.prototype.cloneNode = cloneNode; // override
-
-  scope.registry = registry;
-
-  /**
-   * Upgrade an element to a custom element. Upgrading an element
-   * causes the custom prototype to be applied, an `is` attribute
-   * to be attached (as needed), and invocation of the `readyCallback`.
-   * `upgrade` does nothing if the element is already upgraded, or
-   * if it matches no registered custom tag name.
-   *
-   * @method ugprade
-   * @param {Element} element The element to upgrade.
-   * @return {Element} The upgraded element.
-   */
-  scope.upgrade = upgradeElement;
-}
-
-// Create a custom 'instanceof'. This is necessary when CustomElements
-// are implemented via a mixin strategy, as for example on IE10.
-var isInstance;
-if (!Object.__proto__ && !useNative) {
-  isInstance = function(obj, ctor) {
-    var p = obj;
-    while (p) {
-      // NOTE: this is not technically correct since we're not checking if
-      // an object is an instance of a constructor; however, this should
-      // be good enough for the mixin strategy.
-      if (p === ctor.prototype) {
-        return true;
-      }
-      p = p.__proto__;
-    }
-    return false;
-  }
-} else {
-  isInstance = function(obj, base) {
-    return obj instanceof base;
-  }
-}
-
-// exports
-scope.instanceof = isInstance;
-scope.reservedTagList = reservedTagList;
-
-// bc
-document.register = document.registerElement;
-
-scope.hasNative = hasNative;
-scope.useNative = useNative;
-
-})(window.CustomElements);
-
-/*
- * 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(scope) {
-
-// import
-
-var IMPORT_LINK_TYPE = scope.IMPORT_LINK_TYPE;
-
-// highlander object for parsing a document tree
-
-var parser = {
-  selectors: [
-    'link[rel=' + IMPORT_LINK_TYPE + ']'
-  ],
-  map: {
-    link: 'parseLink'
-  },
-  parse: function(inDocument) {
-    if (!inDocument.__parsed) {
-      // only parse once
-      inDocument.__parsed = true;
-      // all parsable elements in inDocument (depth-first pre-order traversal)
-      var elts = inDocument.querySelectorAll(parser.selectors);
-      // for each parsable node type, call the mapped parsing method
-      forEach(elts, function(e) {
-        parser[parser.map[e.localName]](e);
-      });
-      // upgrade all upgradeable static elements, anything dynamically
-      // created should be caught by observer
-      CustomElements.upgradeDocument(inDocument);
-      // observe document for dom changes
-      CustomElements.observeDocument(inDocument);
-    }
-  },
-  parseLink: function(linkElt) {
-    // imports
-    if (isDocumentLink(linkElt)) {
-      this.parseImport(linkElt);
-    }
-  },
-  parseImport: function(linkElt) {
-    if (linkElt.import) {
-      parser.parse(linkElt.import);
-    }
-  }
-};
-
-function isDocumentLink(inElt) {
-  return (inElt.localName === 'link'
-      && inElt.getAttribute('rel') === IMPORT_LINK_TYPE);
-}
-
-var forEach = Array.prototype.forEach.call.bind(Array.prototype.forEach);
-
-// exports
-
-scope.parser = parser;
-scope.IMPORT_LINK_TYPE = IMPORT_LINK_TYPE;
-
-})(window.CustomElements);
-/*
- * 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(scope){
-
-// bootstrap parsing
-function bootstrap() {
-  // parse document
-  CustomElements.parser.parse(document);
-  // one more pass before register is 'live'
-  CustomElements.upgradeDocument(document);
-  // install upgrade hook if HTMLImports are available
-  if (window.HTMLImports) {
-    HTMLImports.__importsParsingHook = function(elt) {
-      CustomElements.parser.parse(elt.import);
-    }
-  }
-  // set internal 'ready' flag, now document.registerElement will trigger 
-  // synchronous upgrades
-  CustomElements.ready = true;
-  // async to ensure *native* custom elements upgrade prior to this
-  // DOMContentLoaded can fire before elements upgrade (e.g. when there's
-  // an external script)
-  setTimeout(function() {
-    // capture blunt profiling data
-    CustomElements.readyTime = Date.now();
-    if (window.HTMLImports) {
-      CustomElements.elapsed = CustomElements.readyTime - HTMLImports.readyTime;
-    }
-    // notify the system that we are bootstrapped
-    document.dispatchEvent(
-      new CustomEvent('WebComponentsReady', {bubbles: true})
-    );
-  });
-}
-
-// CustomEvent shim for IE
-if (typeof window.CustomEvent !== 'function') {
-  window.CustomEvent = function(inType, params) {
-    params = params || {};
-    var e = document.createEvent('CustomEvent');
-    e.initCustomEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable), params.detail);
-    return e;
-  };
-  window.CustomEvent.prototype = window.Event.prototype;
-}
-
-// When loading at readyState complete time (or via flag), boot custom elements
-// immediately.
-// If relevant, HTMLImports must already be loaded.
-if (document.readyState === 'complete' || scope.flags.eager) {
-  bootstrap();
-// When loading at readyState interactive time, bootstrap only if HTMLImports
-// are not pending. Also avoid IE as the semantics of this state are unreliable.
-} else if (document.readyState === 'interactive' && !window.attachEvent &&
-    (!window.HTMLImports || window.HTMLImports.ready)) {
-  bootstrap();
-// When loading at other readyStates, wait for the appropriate DOM event to 
-// bootstrap.
-} else {
-  var loadEvent = window.HTMLImports && !HTMLImports.ready ?
-      'HTMLImportsLoaded' : 'DOMContentLoaded';
-  window.addEventListener(loadEvent, bootstrap);
-}
-
-})(window.CustomElements);
-
-/*
- * 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() {
-
-if (window.ShadowDOMPolyfill) {
-
-  // ensure wrapped inputs for these functions
-  var fns = ['upgradeAll', 'upgradeSubtree', 'observeDocument',
-      'upgradeDocument'];
-
-  // cache originals
-  var original = {};
-  fns.forEach(function(fn) {
-    original[fn] = CustomElements[fn];
-  });
-
-  // override
-  fns.forEach(function(fn) {
-    CustomElements[fn] = function(inNode) {
-      return original[fn](wrap(inNode));
-    };
-  });
-
-}
-
-})();
-
-/*
- * 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(scope) {
-
-  'use strict';
-
-  // polyfill performance.now
-
-  if (!window.performance) {
-    var start = Date.now();
-    // only at millisecond precision
-    window.performance = {now: function(){ return Date.now() - start }};
-  }
-
-  // polyfill for requestAnimationFrame
-
-  if (!window.requestAnimationFrame) {
-    window.requestAnimationFrame = (function() {
-      var nativeRaf = window.webkitRequestAnimationFrame ||
-        window.mozRequestAnimationFrame;
-
-      return nativeRaf ?
-        function(callback) {
-          return nativeRaf(function() {
-            callback(performance.now());
-          });
-        } :
-        function( callback ){
-          return window.setTimeout(callback, 1000 / 60);
-        };
-    })();
-  }
-
-  if (!window.cancelAnimationFrame) {
-    window.cancelAnimationFrame = (function() {
-      return  window.webkitCancelAnimationFrame ||
-        window.mozCancelAnimationFrame ||
-        function(id) {
-          clearTimeout(id);
-        };
-    })();
-  }
-
-  // Make a stub for Polymer() for polyfill purposes; under the HTMLImports
-  // polyfill, scripts in the main document run before imports. That means
-  // if (1) polymer is imported and (2) Polymer() is called in the main document
-  // in a script after the import, 2 occurs before 1. We correct this here
-  // by specfiically patching Polymer(); this is not necessary under native
-  // HTMLImports.
-  var elementDeclarations = [];
-
-  var polymerStub = function(name, dictionary) {
-    if ((typeof name !== 'string') && (arguments.length === 1)) {
-      Array.prototype.push.call(arguments, document._currentScript);
-    }
-    elementDeclarations.push(arguments);
-  };
-  window.Polymer = polymerStub;
-
-  // deliver queued delcarations
-  scope.consumeDeclarations = function(callback) {
-    scope.consumeDeclarations = function() {
-     throw 'Possible attempt to load Polymer twice';
-    };
-    if (callback) {
-      callback(elementDeclarations);
-    }
-    elementDeclarations = null;
-  };
-
-  function installPolymerWarning() {
-    if (window.Polymer === polymerStub) {
-      window.Polymer = function() {
-        throw new Error('You tried to use polymer without loading it first. To ' +
-          'load polymer, <link rel="import" href="' + 
-          'components/polymer/polymer.html">');
-      };
-    }
-  }
-
-  // Once DOMContent has loaded, any main document scripts that depend on
-  // Polymer() should have run. Calling Polymer() now is an error until
-  // polymer is imported.
-  if (HTMLImports.useNative) {
-    installPolymerWarning();
-  } else {
-    addEventListener('DOMContentLoaded', installPolymerWarning);
-  }
-
-})(window.Platform);
-
-/*
- * 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(scope) {
-
-  // 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.
-  //
-  // NOTE: position: relative fixes IE's failure to inherit opacity 
-  // when a child is not statically positioned.
-  var style = document.createElement('style');
-  style.textContent = ''
-      + 'body {'
-      + 'transition: opacity ease-in 0.2s;' 
-      + ' } \n'
-      + 'body[unresolved] {'
-      + 'opacity: 0; display: block; overflow: hidden; position: relative;' 
-      + ' } \n'
-      ;
-  var head = document.querySelector('head');
-  head.insertBefore(style, head.firstChild);
-
-})(Platform);
-
-/*
- * 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(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);
-
-//# sourceMappingURL=platform.concat.js.map