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

cc/quads/picture_draw_quad.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_QUADS_PICTURE_DRAW_QUAD_H_
 #define CC_QUADS_PICTURE_DRAW_QUAD_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 #include "cc/quads/content_draw_quad_base.h"
 #include "cc/resources/picture_pile_impl.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/rect_f.h"
 #include "ui/gfx/size.h"
 
 namespace cc {
 
 // Used for on-demand tile rasterization.
 class CC_EXPORT PictureDrawQuad : public ContentDrawQuadBase {
  public:
   static scoped_ptr<PictureDrawQuad> Create();
   virtual ~PictureDrawQuad();
 
   void SetNew(const SharedQuadState* shared_quad_state,
-              gfx::Rect rect,
-              gfx::Rect opaque_rect,
+              const gfx::Rect& rect,
+              const gfx::Rect& opaque_rect,
               const gfx::RectF& tex_coord_rect,
               gfx::Size texture_size,
               ResourceFormat texture_format,
-              gfx::Rect content_rect,
+              const gfx::Rect& content_rect,
               float contents_scale,
               scoped_refptr<PicturePileImpl> picture_pile);
 
   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,
               const gfx::RectF& tex_coord_rect,
               gfx::Size texture_size,
               ResourceFormat texture_format,
-              gfx::Rect content_rect,
+              const gfx::Rect& content_rect,
               float contents_scale,
               scoped_refptr<PicturePileImpl> picture_pile);
 
   gfx::Rect content_rect;
   float contents_scale;
   scoped_refptr<PicturePileImpl> picture_pile;
   ResourceFormat texture_format;
 
   virtual void IterateResources(const ResourceIteratorCallback& callback)
       OVERRIDE;
 
   static const PictureDrawQuad* MaterialCast(const DrawQuad* quad);
 
  private:
   PictureDrawQuad();
   virtual void ExtendValue(base::DictionaryValue* value) const OVERRIDE;
 };
 
 }  // namespace cc
 
 #endif  // CC_QUADS_PICTURE_DRAW_QUAD_H_