Revert of [#7] Pass gfx structs by const ref (gfx::Size)

cc/resources/picture_pile_base.h

 // Copyright 2013 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_RESOURCES_PICTURE_PILE_BASE_H_
 #define CC_RESOURCES_PICTURE_PILE_BASE_H_
 
 #include <bitset>
 #include <list>
 #include <utility>
@@ skipping 11 matching lines @@
 }
 
 namespace cc {
 
 class CC_EXPORT PicturePileBase : public base::RefCounted<PicturePileBase> {
  public:
   PicturePileBase();
   explicit PicturePileBase(const PicturePileBase* other);
   PicturePileBase(const PicturePileBase* other, unsigned thread_index);
 
-  void Resize(const gfx::Size& size);
+  void Resize(gfx::Size size);
   gfx::Size size() const { return tiling_.total_size(); }
   void SetMinContentsScale(float min_contents_scale);
 
   void UpdateRecordedRegion();
   const Region& recorded_region() const { return recorded_region_; }
 
   int num_tiles_x() const { return tiling_.num_tiles_x(); }
   int num_tiles_y() const { return tiling_.num_tiles_y(); }
   gfx::Rect tile_bounds(int x, int y) const { return tiling_.TileBounds(x, y); }
   bool HasRecordingAt(int x, int y);
   bool CanRaster(float contents_scale, const gfx::Rect& content_rect);
 
-  static void ComputeTileGridInfo(const gfx::Size& tile_grid_size,
+  static void ComputeTileGridInfo(gfx::Size tile_grid_size,
                                   SkTileGridPicture::TileGridInfo* info);
 
-  void SetTileGridSize(const gfx::Size& tile_grid_size);
+  void SetTileGridSize(gfx::Size tile_grid_size);
   TilingData& tiling() { return tiling_; }
 
   scoped_ptr<base::Value> AsValue() const;
 
  protected:
   class CC_EXPORT PictureInfo {
    public:
     enum {
       INVALIDATION_FRAMES_TRACKED = 32
     };
@@ skipping 51 matching lines @@
  private:
   void SetBufferPixels(int buffer_pixels);
 
   friend class base::RefCounted<PicturePileBase>;
   DISALLOW_COPY_AND_ASSIGN(PicturePileBase);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_PICTURE_PILE_BASE_H_