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

cc/quads/stream_video_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/stream_video_draw_quad.h"
 
 #include "base/logging.h"
 #include "base/values.h"
 #include "cc/base/math_util.h"
 
 namespace cc {
 
 StreamVideoDrawQuad::StreamVideoDrawQuad() : resource_id(0) {}
 
 scoped_ptr<StreamVideoDrawQuad> StreamVideoDrawQuad::Create() {
   return make_scoped_ptr(new StreamVideoDrawQuad);
 }
 
 void StreamVideoDrawQuad::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::Transform& matrix) {
   gfx::Rect visible_rect = rect;
   bool needs_blending = false;
   DrawQuad::SetAll(shared_quad_state, DrawQuad::STREAM_VIDEO_CONTENT, rect,
                    opaque_rect, visible_rect, needs_blending);
   this->resource_id = resource_id;
   this->matrix = matrix;
 }
 
 void StreamVideoDrawQuad::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::Transform& matrix) {
   DrawQuad::SetAll(shared_quad_state, DrawQuad::STREAM_VIDEO_CONTENT, rect,
                    opaque_rect, visible_rect, needs_blending);
   this->resource_id = resource_id;
   this->matrix = matrix;
 }
 
 void StreamVideoDrawQuad::IterateResources(
     const ResourceIteratorCallback& callback) {
   resource_id = callback.Run(resource_id);
 }
 
 const StreamVideoDrawQuad* StreamVideoDrawQuad::MaterialCast(
     const DrawQuad* quad) {
   DCHECK(quad->material == DrawQuad::STREAM_VIDEO_CONTENT);
   return static_cast<const StreamVideoDrawQuad*>(quad);
 }
 
 void StreamVideoDrawQuad::ExtendValue(base::DictionaryValue* value) const {
   value->SetInteger("resource_id", resource_id);
   value->Set("matrix", MathUtil::AsValue(matrix).release());
 }
 
 }  // namespace cc