Defer starting of animations until after compositing update

Source/core/animation/css/CSSPendingAnimations.h

 /*
  * 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 30 matching lines @@
 // animations when both classes of CSS Animations are triggered by the same recalc
 class CSSPendingAnimations FINAL {
 public:
     void add(Player*);
     // Returns whether we are waiting for an animation to start and should
     // service again on the next frame.
     bool startPendingAnimations();
     void notifyCompositorAnimationStarted(double monotonicAnimationStartTime);
 
 private:
-    Vector<std::pair<RefPtr<Player>, double> > m_pending;
+    Vector<RefPtr<Player> > m_pending;
     Vector<RefPtr<Player> > m_waitingForCompositorAnimationStart;
 };
 
 } // namespace WebCore
 
 #endif