cc: Avoid expensive RenderingStats collection.

cc/tiled_layer.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_TILED_LAYER_H_
 #define CC_TILED_LAYER_H_
 
 #include "cc/cc_export.h"
 #include "cc/contents_scaling_layer.h"
 #include "cc/layer_tiling_data.h"
@@ skipping 17 matching lines @@
     virtual bool drawsContent() const OVERRIDE;
 
     virtual void setNeedsDisplayRect(const gfx::RectF&) OVERRIDE;
 
     virtual void setLayerTreeHost(LayerTreeHost*) OVERRIDE;
 
     virtual void setTexturePriorities(const PriorityCalculator&) OVERRIDE;
 
     virtual Region visibleContentOpaqueRegion() const OVERRIDE;
 
-    virtual void update(ResourceUpdateQueue&, const OcclusionTracker*, RenderingStats&) OVERRIDE;
+    virtual void update(ResourceUpdateQueue&, const OcclusionTracker*, RenderingStats*) OVERRIDE;
 
 protected:
     TiledLayer();
     virtual ~TiledLayer();
 
     void updateTileSizeAndTilingOption();
     void updateBounds();
 
     // Exposed to subclasses for testing.
     void setTileSize(const gfx::Size&);
@@ skipping 25 matching lines @@
     virtual scoped_ptr<LayerImpl> createLayerImpl(LayerTreeImpl* treeImpl) OVERRIDE;
 
     void createTilerIfNeeded();
     void setTilingOption(TilingOption);
 
     bool tileOnlyNeedsPartialUpdate(UpdatableTile*);
     bool tileNeedsBufferedUpdate(UpdatableTile*);
 
     void markOcclusionsAndRequestTextures(int left, int top, int right, int bottom, const OcclusionTracker*);
 
-    bool updateTiles(int left, int top, int right, int bottom, ResourceUpdateQueue&, const OcclusionTracker*, RenderingStats&, bool& didPaint);
+    bool updateTiles(int left, int top, int right, int bottom, ResourceUpdateQueue&, const OcclusionTracker*, RenderingStats*, bool& didPaint);
     bool haveTexturesForTiles(int left, int top, int right, int bottom, bool ignoreOcclusions);
     gfx::Rect markTilesForUpdate(int left, int top, int right, int bottom, bool ignoreOcclusions);
-    void updateTileTextures(const gfx::Rect& paintRect, int left, int top, int right, int bottom, ResourceUpdateQueue&, const OcclusionTracker*, RenderingStats&);
+    void updateTileTextures(const gfx::Rect& paintRect, int left, int top, int right, int bottom, ResourceUpdateQueue&, const OcclusionTracker*, RenderingStats*);
     void updateScrollPrediction();
 
     UpdatableTile* tileAt(int, int) const;
     UpdatableTile* createTile(int, int);
 
     bool isSmallAnimatedLayer() const;
 
     unsigned m_textureFormat;
     bool m_skipsDraw;
     bool m_failedUpdate;
 
     // Used for predictive painting.
     gfx::Vector2d m_predictedScroll;
     gfx::Rect m_predictedVisibleRect;
     gfx::Rect m_previousVisibleRect;
     gfx::Size m_previousContentBounds;
 
     TilingOption m_tilingOption;
     scoped_ptr<LayerTilingData> m_tiler;
 };
 
 }
 #endif  // CC_TILED_LAYER_H_