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

cc/layers/tiled_layer_impl.h

 // Copyright 2011 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_TILED_LAYER_IMPL_H_
 #define CC_LAYERS_TILED_LAYER_IMPL_H_
 
 #include <string>
 
 #include "cc/base/cc_export.h"
@@ skipping 20 matching lines @@
   virtual void AppendQuads(QuadSink* quad_sink,
                            AppendQuadsData* append_quads_data) OVERRIDE;
 
   virtual ResourceProvider::ResourceId ContentsResourceId() const OVERRIDE;
 
   void set_skips_draw(bool skips_draw) { skips_draw_ = skips_draw; }
   void SetTilingData(const LayerTilingData& tiler);
   void PushTileProperties(int i,
                           int j,
                           ResourceProvider::ResourceId resource,
-                          gfx::Rect opaque_rect,
+                          const gfx::Rect& opaque_rect,
                           bool contents_swizzled);
   void PushInvalidTile(int i, int j);
 
   virtual Region VisibleContentOpaqueRegion() const OVERRIDE;
   virtual void DidLoseOutputSurface() OVERRIDE;
 
   const LayerTilingData* TilingForTesting() const { return tiler_.get(); }
 
   virtual size_t GPUMemoryUsageInBytes() const OVERRIDE;
 
@@ skipping 16 matching lines @@
   bool skips_draw_;
 
   scoped_ptr<LayerTilingData> tiler_;
 
   DISALLOW_COPY_AND_ASSIGN(TiledLayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_TILED_LAYER_IMPL_H_