CC Animation: Unify ElementId in Blink Compositor Worker.

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 179 matching lines @@
     // deleting the scroll client.
     virtual void setScrollClient(WebLayerScrollClient*) = 0;
 
     // Sets the cc-side layer client.
     virtual void setLayerClient(cc::LayerClient*) = 0;
 
     // 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;
+    // TODO(loyso): These must be CompositorElementId instead of int.
+    virtual void setElementId(int) = 0;
+    virtual int elementId() const = 0;
 
     virtual void setCompositorMutableProperties(uint32_t) = 0;
     virtual uint32_t compositorMutableProperties() const = 0;
 };
 
 } // namespace blink
 
 #endif // WebLayer_h