Animations: Introduce compositor AnimationPlayer and AnimationTimeline.

Source/core/animation/DocumentAnimations.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 69 matching lines @@
 }
 
 bool DocumentAnimations::needsOutdatedAnimationPlayerUpdate(const Document& document)
 {
     return document.timeline().hasOutdatedAnimationPlayer();
 }
 
 void DocumentAnimations::updateCompositorAnimations(Document& document)
 {
     ASSERT(document.lifecycle().state() == DocumentLifecycle::CompositingClean);
+    document.timeline().updateCompositorPlayerToElementAttachments();
+
     if (document.compositorPendingAnimations().update()) {
         ASSERT(document.view());
         document.view()->scheduleAnimation();
     }
 
     document.timeline().scheduleNextService();
 }
 
 } // namespace blink