[#2] Pass gfx structs by const ref (gfx::Rect, gfx::RectF)

cc/quads/tile_draw_quad.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_QUADS_TILE_DRAW_QUAD_H_
 #define CC_QUADS_TILE_DRAW_QUAD_H_
 
 #include "cc/quads/content_draw_quad_base.h"
 
 namespace cc {
 
 class CC_EXPORT TileDrawQuad : public ContentDrawQuadBase {
  public:
   static scoped_ptr<TileDrawQuad> Create();
   virtual ~TileDrawQuad();
 
   void SetNew(const SharedQuadState* shared_quad_state,
-              gfx::Rect rect,
-              gfx::Rect opaque_rect,
+              const gfx::Rect& rect,
+              const gfx::Rect& opaque_rect,
               unsigned resource_id,
               const gfx::RectF& tex_coord_rect,
               gfx::Size texture_size,
               bool swizzle_contents);
 
   void SetAll(const SharedQuadState* shared_quad_state,
-              gfx::Rect rect,
-              gfx::Rect opaque_rect,
-              gfx::Rect visible_rect,
+              const gfx::Rect& rect,
+              const gfx::Rect& opaque_rect,
+              const gfx::Rect& visible_rect,
               bool needs_blending,
               unsigned resource_id,
               const gfx::RectF& tex_coord_rect,
               gfx::Size texture_size,
               bool swizzle_contents);
 
   unsigned resource_id;
 
   virtual void IterateResources(const ResourceIteratorCallback& callback)
       OVERRIDE;
 
   static const TileDrawQuad* MaterialCast(const DrawQuad*);
 
  private:
   TileDrawQuad();
   virtual void ExtendValue(base::DictionaryValue* value) const OVERRIDE;
 };
 
 }  // namespace cc
 
 #endif  // CC_QUADS_TILE_DRAW_QUAD_H_