Run smooth scroll animations on the compositor when possible

third_party/WebKit/Source/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 185 matching lines @@
 
     // Set that the position/size of the contents (image or video).
     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(PassOwnPtr<WebCompositorAnimation>);
     void pauseAnimation(int animationId, double /*timeOffset*/);
     void removeAnimation(int animationId);
+    void abortAnimation(int animationId);
 
     // Layer contents
     void setContentsToImage(Image*, RespectImageOrientationEnum = DoNotRespectImageOrientation);
     void setContentsToPlatformLayer(WebLayer* layer) { setContentsTo(layer); }
     bool hasContentsLayer() const { return m_contentsLayer; }
 
     // For hosting this GraphicsLayer in a native layer hierarchy.
     WebLayer* platformLayer() const;
 
     typedef HashMap<int, int> RenderingContextMap;
@@ skipping 169 matching lines @@
 };
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the blink namespace for ease of invocation from gdb.
 void PLATFORM_EXPORT showGraphicsLayerTree(const blink::GraphicsLayer*);
 #endif
 
 #endif // GraphicsLayer_h