Fix Polymer licensing issues

third_party/web-animations-js/sources/src/effect-callback.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) {
-
-  var nullTarget = document.createElementNS('http://www.w3.org/1999/xhtml', 'div');
-
-  var sequenceNumber = 0;
-  scope.bindPlayerForCustomEffect = function(player) {
-    var target = player.source.target;
-    var effect = player.source.effect;
-    var timing = player.source.timing;
-    var last = undefined;
-    timing = shared.normalizeTimingInput(timing);
-    var callback = function() {
-      var t = callback._player ? callback._player.currentTime : null;
-      if (t !== null) {
-        t = shared.calculateTimeFraction(shared.calculateActiveDuration(timing), t, timing);
-        if (isNaN(t))
-          t = null;
-      }
-      // FIXME: There are actually more conditions under which the effect
-      // should be called.
-      if (t !== last)
-        effect(t, target, player.source);
-      last = t;
-    };
-
-    callback._player = player;
-    callback._registered = false;
-    callback._sequenceNumber = sequenceNumber++;
-    player._callback = callback;
-    register(callback);
-  };
-
-  var callbacks = [];
-  var ticking = false;
-  function register(callback) {
-    if (callback._registered)
-      return;
-    callback._registered = true;
-    callbacks.push(callback);
-    if (!ticking) {
-      ticking = true;
-      requestAnimationFrame(tick);
-    }
-  }
-
-  function tick(t) {
-    var updating = callbacks;
-    callbacks = [];
-    updating.sort(function(left, right) {
-      return left._sequenceNumber - right._sequenceNumber;
-    });
-    updating.filter(function(callback) {
-      callback();
-      if (!callback._player || callback._player.finished || callback._player.paused)
-        callback._registered = false;
-      return callback._registered;
-    });
-    callbacks.push.apply(callbacks, updating);
-
-    if (callbacks.length) {
-      ticking = true;
-      requestAnimationFrame(tick);
-    } else {
-      ticking = false;
-    }
-  }
-
-  scope.Player.prototype._register = function() {
-    if (this._callback)
-      register(this._callback);
-  };
-
-})(webAnimationsShared, webAnimationsNext, webAnimationsTesting);