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

third_party/web-animations-js/sources/src/group-constructors.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) {
+
+  function constructor(children, timingInput) {
+    this.children = children || [];
+    this._timing = shared.normalizeTimingInput(timingInput, true);
+    this.timing = shared.makeTiming(timingInput, true);
+
+    if (this._timing.duration === 'auto')
+      this._timing.duration = this.activeDuration;
+  }
+
+  window.AnimationSequence = function() {
+    constructor.apply(this, arguments);
+  };
+
+  window.AnimationGroup = function() {
+    constructor.apply(this, arguments);
+  };
+
+  window.AnimationSequence.prototype = {
+    get activeDuration() {
+      var total = 0;
+      this.children.forEach(function(child) {
+        total += scope.groupChildDuration(child);
+      });
+      return Math.max(total, 0);
+    }
+  };
+
+  window.AnimationGroup.prototype = {
+    get activeDuration() {
+      var max = 0;
+      this.children.forEach(function(child) {
+        max = Math.max(max, scope.groupChildDuration(child));
+      });
+      return max;
+    }
+  };
+
+  scope.newUnderlyingPlayerForGroup = function(group) {
+    var underlyingPlayer;
+    var ticker = function(tf) {
+      var player = underlyingPlayer._wrapper;
+      if (!player.source)
+        return;
+      if (tf == null) {
+        player._removePlayers();
+        return;
+      }
+      if (player.startTime === null)
+        return;
+
+      player._updateChildren();
+    };
+
+    underlyingPlayer = scope.timeline.play(new scope.Animation(null, ticker, group._timing));
+    return underlyingPlayer;
+  };
+
+  scope.bindPlayerForGroup = function(player) {
+    player._player._wrapper = player;
+    player._isGroup = true;
+    scope.awaitStartTime(player);
+    player._updateChildren();
+  };
+
+
+})(webAnimationsShared, webAnimationsNext, webAnimationsTesting);