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

cc/quads/content_draw_quad_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_QUADS_CONTENT_DRAW_QUAD_BASE_H_
 #define CC_QUADS_CONTENT_DRAW_QUAD_BASE_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 #include "cc/quads/draw_quad.h"
 #include "third_party/khronos/GLES2/gl2.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/size.h"
 
 namespace cc {
 
 class CC_EXPORT ContentDrawQuadBase : public DrawQuad {
  public:
   void SetNew(const SharedQuadState* shared_quad_state,
               DrawQuad::Material material,
-              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,
               bool swizzle_contents);
 
   void SetAll(const SharedQuadState* shared_quad_state,
               DrawQuad::Material material,
-              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,
               bool swizzle_contents);
 
   gfx::RectF tex_coord_rect;
   gfx::Size texture_size;
   bool swizzle_contents;
 
  protected:
   ContentDrawQuadBase();
   virtual ~ContentDrawQuadBase();
   virtual void ExtendValue(base::DictionaryValue* value) const OVERRIDE;
 };
 
 }  // namespace cc
 
 #endif  // CC_QUADS_CONTENT_DRAW_QUAD_BASE_H_