Change WebLayer::addAnimation to transfer ownership of WebAnimation.

public/platform/WebLayer.h

 /*
  * Copyright (C) 2011 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 118 matching lines @@
 
     // Provides a bitfield that describe why this composited layer was created.
     virtual void setCompositingReasons(WebCompositingReasons) = 0;
 
     // An animation delegate is notified when animations are started and
     // stopped. The WebLayer does not take ownership of the delegate, and it is
     // the responsibility of the client to reset the layer's delegate before
     // deleting the delegate.
     virtual void setAnimationDelegate(WebAnimationDelegate*) = 0;
 
+    // TODO(dshwang): temporary macro to change addAnimation() in both Blink and Chromium.
+#define ANIMATION_OWNERSHIP_NOT_TRANSFER
+
     // Returns false if the animation cannot be added.
+    // It passes ownership of WebAnimation to Chromium.
+    // NOTE: Chromium owns the WebAnimation pointer.
     virtual bool addAnimation(WebAnimation*) = 0;
 
     // Removes all animations with the given id.
     virtual void removeAnimation(int animationId) = 0;
 
     // Removes all animations with the given id targeting the given property.
     virtual void removeAnimation(int animationId, WebAnimation::TargetProperty) = 0;
 
     // Pauses all animations with the given id.
     virtual void pauseAnimation(int animationId, double timeOffset) = 0;
@@ skipping 59 matching lines @@
 
     // True if the layer is not part of a tree attached to a WebLayerTreeView.
     virtual bool isOrphan() const = 0;
 
     virtual void setWebLayerClient(WebLayerClient*) = 0;
 };
 
 } // namespace WebKit
 
 #endif // WebLayer_h