Web Animations: Introduce ActiveAnimations and AnimationStack

Source/core/animation/TimedItemTest.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 34 matching lines @@
     }
 
     void updateInheritedTime(double time)
     {
         TimedItem::updateInheritedTime(time);
     }
 
     void updateChildrenAndEffects(bool wasActiveOrInEffect) const FINAL OVERRIDE {
     }
 
+    void willDetach() { }
+
 private:
     TestTimedItem(const Timing& specified)
         : TimedItem(specified)
     {
     }
 };
 
 TEST(TimedItem, Sanity)
 {
     Timing timing;
@@ skipping 422 matching lines @@
 
     timedItem->updateInheritedTime(0);
     ASSERT_EQ(1, timedItem->currentIteration());
     ASSERT_EQ(1, timedItem->timeFraction());
 
     timedItem->updateInheritedTime(1);
     ASSERT_EQ(1, timedItem->currentIteration());
     ASSERT_EQ(1, timedItem->timeFraction());
 }
 }