cc: Avoid expensive RenderingStats collection.

cc/bitmap_skpicture_content_layer_updater.h

 // Copyright 2011 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_BITMAP_SKPICTURE_CONTENT_LAYER_UPDATER_H_
 #define CC_BITMAP_SKPICTURE_CONTENT_LAYER_UPDATER_H_
 
 #include "cc/skpicture_content_layer_updater.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 namespace cc {
 
 // This class records the contentRect into an SkPicture, then software rasterizes
 // the SkPicture into bitmaps for each tile. This implements Settings::perTilePainting.
 class BitmapSkPictureContentLayerUpdater : public SkPictureContentLayerUpdater {
 public:
     class Resource : public ContentLayerUpdater::Resource {
     public:
         Resource(BitmapSkPictureContentLayerUpdater*, scoped_ptr<PrioritizedResource>);
 
-        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:
         BitmapSkPictureContentLayerUpdater* updater() { return m_updater; }
 
         SkBitmap m_bitmap;
         BitmapSkPictureContentLayerUpdater* m_updater;
     };
 
     static scoped_refptr<BitmapSkPictureContentLayerUpdater> create(scoped_ptr<LayerPainter>);
 
     virtual scoped_ptr<LayerUpdater::Resource> createResource(PrioritizedResourceManager*) OVERRIDE;
-    void paintContentsRect(SkCanvas*, const gfx::Rect& sourceRect, RenderingStats&);
+    void paintContentsRect(SkCanvas*, const gfx::Rect& sourceRect, RenderingStats*);
 
 private:
     explicit BitmapSkPictureContentLayerUpdater(scoped_ptr<LayerPainter>);
     virtual ~BitmapSkPictureContentLayerUpdater();
 };
 
 }  // namespace cc
 
 #endif  // CC_BITMAP_SKPICTURE_CONTENT_LAYER_UPDATER_H_