Change WebLayer::addAnimation to transfer ownership of WebAnimation.

Source/core/platform/graphics/GraphicsLayer.h

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. 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 207 matching lines @@
 
     void setContentsNeedsDisplay();
 
     // Set that the position/size of the contents (image or video).
     IntRect contentsRect() const { return m_contentsRect; }
     void setContentsRect(const IntRect&);
 
     // Return true if the animation is handled by the compositing system. If this returns
     // false, the animation will be run by AnimationController.
     // These methods handle both transitions and keyframe animations.
-    bool addAnimation(WebKit::WebAnimation*);
+    bool addAnimation(PassOwnPtr<WebKit::WebAnimation>);
     void pauseAnimation(int animationId, double /*timeOffset*/);
     void removeAnimation(int animationId);
 
     void suspendAnimations(double time);
 
     // Layer contents
     void setContentsToImage(Image*);
     void setContentsToNinePatch(Image*, const IntRect& aperture);
     bool shouldDirectlyCompositeImage(Image*) const { return true; }
     void setContentsToMedia(WebKit::WebLayer*); // video or plug-in
@@ skipping 180 matching lines @@
 
 
 } // namespace WebCore
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showGraphicsLayerTree(const WebCore::GraphicsLayer* layer);
 #endif
 
 #endif // GraphicsLayer_h