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

cc/layers/delegated_renderer_layer_impl.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/delegated_renderer_layer_impl.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 82 matching lines @@
   if (child_id_)
     return;
 
   ResourceProvider* resource_provider = layer_tree_impl()->resource_provider();
   child_id_ = resource_provider->CreateChild(return_callback);
   own_child_id_ = true;
 }
 
 void DelegatedRendererLayerImpl::SetFrameData(
     const DelegatedFrameData* frame_data,
-    gfx::RectF damage_in_frame) {
+    const gfx::RectF& damage_in_frame) {
   DCHECK(child_id_) << "CreateChildIdIfNeeded must be called first.";
   DCHECK(frame_data);
   DCHECK(!frame_data->render_pass_list.empty());
   // A frame with an empty root render pass is invalid.
   DCHECK(!frame_data->render_pass_list.back()->output_rect.IsEmpty());
 
   ResourceProvider* resource_provider = layer_tree_impl()->resource_provider();
     const ResourceProvider::ResourceIdMap& resource_map =
         resource_provider->GetChildToParentMap(child_id_);
 
@@ skipping 368 matching lines @@
   if (own_child_id_) {
     ResourceProvider* provider = layer_tree_impl()->resource_provider();
     provider->DestroyChild(child_id_);
   }
 
   resources_.clear();
   child_id_ = 0;
 }
 
 }  // namespace cc