Implement SkPicture::bytesUsed() for SkRecord backend

src/core/SkTileGrid.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkTileGrid_DEFINED
 #define SkTileGrid_DEFINED
 
 #include "SkBBHFactory.h"
 #include "SkBBoxHierarchy.h"
 
 /**
  * Subclass of SkBBoxHierarchy that stores elements in buckets that correspond
  * to tile regions, disposed in a regular grid.  This is useful when the tile
  * structure that will be use in search() calls is known prior to insertion.
  */
 class SkTileGrid : public SkBBoxHierarchy {
 public:
     SkTileGrid(int xTiles, int yTiles, const SkTileGridFactory::TileGridInfo& info);
     virtual ~SkTileGrid();
 
     virtual void insert(SkAutoTMalloc<SkRect>* boundsArray, int N) SK_OVERRIDE;
     virtual void search(const SkRect& query, SkTDArray<unsigned>* results) const SK_OVERRIDE;
 
     // For testing.
     int tileCount(int x, int y) { return fTiles[y * fXTiles + x].count(); }
 
+    virtual size_t bytesUsed() const SK_OVERRIDE;
+
 private:
     void reserve(int);
     void shrinkToFit();
 
     void commonAdjust(SkRect*) const;
     void userToGrid(const SkRect&, SkIRect* grid) const;
 
     const int fXTiles, fYTiles;
     const SkScalar fInvWidth, fInvHeight;
     const SkScalar fMarginWidth, fMarginHeight;
     const SkPoint fOffset;
     const SkRect  fGridBounds;
 
     // (fXTiles * fYTiles) SkTDArrays, each listing ops overlapping that tile in order.
     SkTDArray<unsigned>* fTiles;
 
     typedef SkBBoxHierarchy INHERITED;
 };
 
 #endif