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

cc/layers/delegated_renderer_layer_impl.h

 // 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.
 
 #ifndef CC_LAYERS_DELEGATED_RENDERER_LAYER_IMPL_H_
 #define CC_LAYERS_DELEGATED_RENDERER_LAYER_IMPL_H_
 
 #include "base/containers/hash_tables.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
@@ skipping 28 matching lines @@
   virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
 
   void AppendContributingRenderPasses(RenderPassSink* render_pass_sink);
 
   // Creates an ID with the resource provider for the child renderer
   // that will be sending quads to the layer. Registers the callback to
   // inform when resources are no longer in use.
   void CreateChildIdIfNeeded(const ReturnCallback& return_callback);
 
   void SetFrameData(const DelegatedFrameData* frame_data,
-                    gfx::RectF damage_in_frame);
+                    const gfx::RectF& damage_in_frame);
 
   void SetDisplaySize(gfx::Size size);
 
  protected:
   DelegatedRendererLayerImpl(LayerTreeImpl* tree_impl, int id);
 
   int ChildIdForTesting() const { return child_id_; }
   const ScopedPtrVector<RenderPass>& RenderPassesInDrawOrderForTesting() const {
     return render_passes_in_draw_order_;
   }
@@ skipping 37 matching lines @@
   gfx::Size display_size_;
   int child_id_;
   bool own_child_id_;
 
   DISALLOW_COPY_AND_ASSIGN(DelegatedRendererLayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_DELEGATED_RENDERER_LAYER_IMPL_H_