Add fixed raster scale use counter histograms.

third_party/WebKit/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 184 matching lines @@
 
     // Gets the underlying cc layer.
     virtual const cc::Layer* ccLayer() const = 0;
     virtual cc::Layer* ccLayer() = 0;
 
     virtual void setElementId(uint64_t) = 0;
     virtual uint64_t elementId() const = 0;
 
     virtual void setCompositorMutableProperties(uint32_t) = 0;
     virtual uint32_t compositorMutableProperties() const = 0;
+
+    virtual void setHasWillChangeTransformHint(bool) = 0;
 };
 
 } // namespace blink
 
 #endif // WebLayer_h