cc: Avoid expensive RenderingStats collection.

cc/image_layer_updater.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_IMAGE_LAYER_UPDATER_H_
 #define CC_IMAGE_LAYER_UPDATER_H_
 
 #include "cc/layer_updater.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 namespace cc {
 
 class ResourceUpdateQueue;
 
 class ImageLayerUpdater : public LayerUpdater {
 public:
     class Resource : public LayerUpdater::Resource {
     public:
         Resource(ImageLayerUpdater* updater, scoped_ptr<PrioritizedResource> texture);
         virtual ~Resource();
 
-        virtual void update(ResourceUpdateQueue&, const gfx::Rect& sourceRect, const gfx::Vector2d& destOffset, bool partialUpdate, RenderingStats&) OVERRIDE;
+        virtual void update(ResourceUpdateQueue&, const gfx::Rect& sourceRect, const gfx::Vector2d& destOffset, bool partialUpdate, RenderingStats*) OVERRIDE;
 
     private:
         ImageLayerUpdater* m_updater;
     };
 
     static scoped_refptr<ImageLayerUpdater> create();
 
     virtual scoped_ptr<LayerUpdater::Resource> createResource(
         PrioritizedResourceManager*) OVERRIDE;
 
     void updateTexture(ResourceUpdateQueue&, PrioritizedResource*, const gfx::Rect& sourceRect, const gfx::Vector2d& destOffset, bool partialUpdate);
 
     void setBitmap(const SkBitmap&);
 
 private:
     ImageLayerUpdater() { }
     virtual ~ImageLayerUpdater() { }
 
     SkBitmap m_bitmap;
 };
 
 }  // namespace cc
 
 #endif  // CC_IMAGE_LAYER_UPDATER_H_