cc: Chromify the LayerTreeHostImpl class.

cc/layer_tree_impl.h

Index: cc/layer_tree_impl.h
diff --git a/cc/layer_tree_impl.h b/cc/layer_tree_impl.h
index 9c752b8eebc176e812ac458bd831ac37c5879432..189434dd48041884e96cc76ca9c95bb6785014a9 100644
--- a/cc/layer_tree_impl.h
+++ b/cc/layer_tree_impl.h
@@ -75,14 +75,14 @@ class CC_EXPORT LayerTreeImpl {
   const LayerTreeDebugState& debug_state() const;
   float device_scale_factor() const;
   gfx::Size device_viewport_size() const;
-  const gfx::Size& layout_viewport_size() const;
+  gfx::Size layout_viewport_size() const;
   std::string layer_tree_as_text() const;
   DebugRectHistory* debug_rect_history() const;
   scoped_ptr<base::Value> AsValue() const;
 
   // Other public methods
   // ---------------------------------------------------------------------------
-  LayerImpl* RootLayer() const { return root_layer_.get(); }
+  LayerImpl* root_layer() const { return root_layer_.get(); }
   void SetRootLayer(scoped_ptr<LayerImpl>);
   scoped_ptr<LayerImpl> DetachLayerTree();