cc: Chromify the LayerTreeHostImpl class.

cc/layer_tree_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_LAYER_TREE_IMPL_H_
 #define CC_LAYER_TREE_IMPL_H_
 
 #include "base/hash_tables.h"
 #include "base/values.h"
 #include "cc/layer_impl.h"
@@ skipping 57 matching lines @@
 
   // Tree specific methods exposed to layer-impl tree.
   // ---------------------------------------------------------------------------
   void SetNeedsRedraw();
 
   // TODO(nduca): These are implemented in cc files temporarily, but will become
   // trivial accessors in a followup patch.
   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();
 
   void PushPropertiesTo(LayerTreeImpl*);
 
   int source_frame_number() const { return source_frame_number_; }
   void set_source_frame_number(int frame_number) {
     source_frame_number_ = frame_number;
   }
 
@@ skipping 129 matching lines @@
   // In impl-side painting mode, this is true when the tree may contain
   // structural differences relative to the active tree.
   bool needs_full_tree_sync_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 };
 
 }
 
 #endif  // CC_LAYER_TREE_IMPL_H_