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

cc/layers/nine_patch_layer.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/layers/nine_patch_layer.h"
 
 #include "cc/layers/nine_patch_layer_impl.h"
 #include "cc/resources/prioritized_resource.h"
 #include "cc/resources/resource_update.h"
 #include "cc/resources/resource_update_queue.h"
 #include "cc/resources/scoped_ui_resource.h"
 #include "cc/resources/ui_resource_bitmap.h"
 #include "cc/trees/layer_tree_host.h"
 
 namespace cc {
 
 scoped_refptr<NinePatchLayer> NinePatchLayer::Create() {
   return make_scoped_refptr(new NinePatchLayer());
 }
 
 NinePatchLayer::NinePatchLayer() : fill_center_(false) {}
 
 NinePatchLayer::~NinePatchLayer() {}
 
 scoped_ptr<LayerImpl> NinePatchLayer::CreateLayerImpl(
     LayerTreeImpl* tree_impl) {
   return NinePatchLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
 }
 
-void NinePatchLayer::SetBorder(gfx::Rect border) {
+void NinePatchLayer::SetBorder(const gfx::Rect& border) {
   if (border == border_)
     return;
   border_ = border;
   SetNeedsCommit();
 }
 
-void NinePatchLayer::SetAperture(gfx::Rect aperture) {
+void NinePatchLayer::SetAperture(const gfx::Rect& aperture) {
   if (image_aperture_ == aperture)
     return;
 
   image_aperture_ = aperture;
   SetNeedsCommit();
 }
 
 void NinePatchLayer::SetFillCenter(bool fill_center) {
   if (fill_center_ == fill_center)
     return;
 
   fill_center_ = fill_center;
   SetNeedsCommit();
 }
 
 void NinePatchLayer::PushPropertiesTo(LayerImpl* layer) {
   UIResourceLayer::PushPropertiesTo(layer);
   NinePatchLayerImpl* layer_impl = static_cast<NinePatchLayerImpl*>(layer);
 
   if (!ui_resource_holder_) {
     layer_impl->SetUIResourceId(0);
   } else {
     DCHECK(layer_tree_host());
 
     layer_impl->SetLayout(image_aperture_, border_, fill_center_);
   }
 }
 
 }  // namespace cc