cc: Avoid expensive RenderingStats collection.

cc/picture.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_PICTURE_H_
 #define CC_PICTURE_H_
 
 #include <list>
 
 #include "base/basictypes.h"
@@ skipping 16 matching lines @@
   static scoped_refptr<Picture> Create(gfx::Rect layer_rect);
 
   const gfx::Rect& LayerRect() const { return layer_rect_; }
   const gfx::Rect& OpaqueRect() const { return opaque_rect_; }
 
   // Make a thread-safe clone for rasterizing with.
   scoped_refptr<Picture> Clone() const;
 
   // Record a paint operation. To be able to safely use this SkPicture for
   // playback on a different thread this can only be called once.
-  void Record(ContentLayerClient*, RenderingStats&);
+  void Record(ContentLayerClient*, RenderingStats*);
 
   // Has Record() been called yet?
   bool HasRecording() const { return picture_.get() != NULL; }
 
   // Apply this contents scale and raster the content rect into the canvas.
   void Raster(SkCanvas* canvas, gfx::Rect content_rect, float contents_scale);
 
   void GatherPixelRefs(
       const gfx::Rect& layer_rect,
       std::list<skia::LazyPixelRef*>& pixel_ref_list);
@@ skipping 11 matching lines @@
   gfx::Rect opaque_rect_;
   skia::RefPtr<SkPicture> picture_;
 
   friend class base::RefCountedThreadSafe<Picture>;
   DISALLOW_COPY_AND_ASSIGN(Picture);
 };
 
 }  // namespace cc
 
 #endif  // CC_PICTURE_H_