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

cc/quads/tile_draw_quad.cc

 // 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.
 
 #include "cc/quads/tile_draw_quad.h"
 
 #include "base/logging.h"
 #include "base/values.h"
 #include "third_party/khronos/GLES2/gl2.h"
 
 namespace cc {
 
 TileDrawQuad::TileDrawQuad()
     : resource_id(0) {
 }
 
 TileDrawQuad::~TileDrawQuad() {
 }
 
 scoped_ptr<TileDrawQuad> TileDrawQuad::Create() {
   return make_scoped_ptr(new TileDrawQuad);
 }
 
 void TileDrawQuad::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) {
   ContentDrawQuadBase::SetNew(shared_quad_state, DrawQuad::TILED_CONTENT, rect,
                               opaque_rect, tex_coord_rect, texture_size,
                               swizzle_contents);
   this->resource_id = resource_id;
 }
 
 void TileDrawQuad::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) {
   ContentDrawQuadBase::SetAll(shared_quad_state, DrawQuad::TILED_CONTENT, rect,
                               opaque_rect, visible_rect, needs_blending,
                               tex_coord_rect, texture_size, swizzle_contents);
   this->resource_id = resource_id;
 }
 
 void TileDrawQuad::IterateResources(
     const ResourceIteratorCallback& callback) {
   resource_id = callback.Run(resource_id);
 }
 
 const TileDrawQuad* TileDrawQuad::MaterialCast(const DrawQuad* quad) {
   DCHECK(quad->material == DrawQuad::TILED_CONTENT);
   return static_cast<const TileDrawQuad*>(quad);
 }
 
 void TileDrawQuad::ExtendValue(base::DictionaryValue* value) const {
   ContentDrawQuadBase::ExtendValue(value);
   value->SetInteger("resource_id", resource_id);
 }
 
 }  // namespace cc