Pull web-animations-js into third-party via the third_party/polymer/reproduce.sh script. Add necess…

third_party/web-animations-js/sources/src/timeline.js

+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+//     You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//     See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+(function(shared, scope, testing) {
+
+  scope.AnimationTimeline = function() {
+    this._players = [];
+    this.currentTime = undefined;
+  };
+
+  scope.AnimationTimeline.prototype = {
+    // FIXME: This needs to return the wrapped players in Web Animations Next
+    // TODO: Does this need to be sorted?
+    // TODO: Do we need to consider needsRetick?
+    getAnimationPlayers: function() {
+      this._discardPlayers();
+      return this._players.slice();
+    },
+    _discardPlayers: function() {
+      this._players = this._players.filter(function(player) {
+        return player.playState != 'finished' && player.playState != 'idle';
+      });
+    },
+    play: function(source) {
+      var player = new scope.Player(source);
+      this._players.push(player);
+      scope.restartWebAnimationsNextTick();
+      player.play();
+      return player;
+    },
+  };
+
+  var ticking = false;
+
+  scope.restartWebAnimationsNextTick = function() {
+    if (!ticking) {
+      ticking = true;
+      requestAnimationFrame(webAnimationsNextTick);
+    }
+  };
+
+  function webAnimationsNextTick(t) {
+    var timeline = window.document.timeline;
+    timeline.currentTime = t;
+    timeline._discardPlayers();
+    if (timeline._players.length == 0)
+      ticking = false;
+    else
+      requestAnimationFrame(webAnimationsNextTick);
+  }
+
+  var timeline = new scope.AnimationTimeline();
+  scope.timeline = timeline;
+
+  try {
+    Object.defineProperty(window.document, 'timeline', {
+      configurable: true,
+      get: function() { return timeline; }
+    });
+  } catch (e) { }
+  try {
+    window.document.timeline = timeline;
+  } catch (e) { }
+
+})(webAnimationsShared, webAnimationsNext, webAnimationsTesting);