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

cc/resources/layer_tiling_data.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_RESOURCES_LAYER_TILING_DATA_H_
 #define CC_RESOURCES_LAYER_TILING_DATA_H_
 
 #include <utility>
 
 #include "base/basictypes.h"
 #include "base/containers/hash_tables.h"
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 #include "cc/base/region.h"
 #include "cc/base/tiling_data.h"
 #include "ui/gfx/rect.h"
 
 namespace cc {
 
 class CC_EXPORT LayerTilingData {
  public:
   enum BorderTexelOption {
     HAS_BORDER_TEXELS,
     NO_BORDER_TEXELS
   };
 
   ~LayerTilingData();
 
-  static scoped_ptr<LayerTilingData> Create(gfx::Size tile_size,
+  static scoped_ptr<LayerTilingData> Create(const gfx::Size& tile_size,
                                             BorderTexelOption option);
 
   bool has_empty_bounds() const { return tiling_data_.has_empty_bounds(); }
   int num_tiles_x() const { return tiling_data_.num_tiles_x(); }
   int num_tiles_y() const { return tiling_data_.num_tiles_y(); }
   gfx::Rect tile_bounds(int i, int j) const {
     return tiling_data_.TileBounds(i, j);
   }
   gfx::Vector2d texture_offset(int x_index, int y_index) const {
     return tiling_data_.TextureOffset(x_index, y_index);
   }
 
   // Change the tile size. This may invalidate all the existing tiles.
-  void SetTileSize(gfx::Size size);
+  void SetTileSize(const gfx::Size& size);
   gfx::Size tile_size() const;
   // Change the border texel setting. This may invalidate all existing tiles.
   void SetBorderTexelOption(BorderTexelOption option);
   bool has_border_texels() const { return !!tiling_data_.border_texels(); }
 
   bool is_empty() const { return has_empty_bounds() || !tiles().size(); }
 
   const LayerTilingData& operator=(const LayerTilingData&);
 
   class Tile {
@@ skipping 19 matching lines @@
     DISALLOW_COPY_AND_ASSIGN(Tile);
   };
   typedef std::pair<int, int> TileMapKey;
   typedef base::ScopedPtrHashMap<TileMapKey, Tile> TileMap;
 
   void AddTile(scoped_ptr<Tile> tile, int i, int j);
   scoped_ptr<Tile> TakeTile(int i, int j);
   Tile* TileAt(int i, int j) const;
   const TileMap& tiles() const { return tiles_; }
 
-  void SetBounds(gfx::Size size);
+  void SetBounds(const gfx::Size& size);
   gfx::Size bounds() const { return tiling_data_.total_size(); }
 
   void ContentRectToTileIndices(const gfx::Rect& rect,
                                 int* left,
                                 int* top,
                                 int* right,
                                 int* bottom) const;
   gfx::Rect TileRect(const Tile* tile) const;
 
   Region OpaqueRegionInContentRect(const gfx::Rect& rect) const;
 
   void reset() { tiles_.clear(); }
 
  protected:
-  LayerTilingData(gfx::Size tile_size, BorderTexelOption option);
+  LayerTilingData(const gfx::Size& tile_size, BorderTexelOption option);
 
   TileMap tiles_;
   TilingData tiling_data_;
 
   DISALLOW_COPY(LayerTilingData);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_LAYER_TILING_DATA_H_