Add pre finalizer to Animation to ensure compositor handles get cleaned up

third_party/WebKit/Source/core/animation/Animation.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 44 matching lines @@
 class ExceptionState;
 
 class CORE_EXPORT Animation final
     : public EventTargetWithInlineData
     , public ActiveScriptWrappable
     , public ActiveDOMObject
     , public CompositorAnimationDelegate
     , public CompositorAnimationPlayerClient {
     DEFINE_WRAPPERTYPEINFO();
     USING_GARBAGE_COLLECTED_MIXIN(Animation);
+    USING_PRE_FINALIZER(Animation, dispose);
 public:
     enum AnimationPlayState {
         Unset,
         Idle,
         Pending,
         Running,
         Paused,
         Finished
     };
 
@@ skipping 220 matching lines @@
     };
 
     // This mirrors the known compositor state. It is created when a compositor
     // animation is started. Updated once the start time is known and each time
     // modifications are pushed to the compositor.
     std::unique_ptr<CompositorState> m_compositorState;
     bool m_compositorPending;
     int m_compositorGroup;
 
     std::unique_ptr<CompositorAnimationPlayer> m_compositorPlayer;
+    bool m_preFinalizerRegistered;
 
     bool m_currentTimePending;
     bool m_stateIsBeingUpdated;
 
     bool m_effectSuppressed;
 };
 
 } // namespace blink
 
 #endif // Animation_h