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

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);