cc: Move updateDrawProperties to LayerTreeImpl

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 e6d62e00867df9d52e47e390ad12135b165a55f5..4b16f46d0b7069730ff7dce04c03e689763bd4c9 100644
--- a/cc/layer_tree_impl.h
+++ b/cc/layer_tree_impl.h
@@ -35,6 +35,8 @@ class TileManager;
 
 class CC_EXPORT LayerTreeImpl {
  public:
+  typedef std::vector<LayerImpl*> LayerList;
+
   static scoped_ptr<LayerTreeImpl> create(LayerTreeHostImpl* layer_tree_host_impl)
   {
     return make_scoped_ptr(new LayerTreeImpl(layer_tree_host_impl));
@@ -91,6 +93,13 @@ class CC_EXPORT LayerTreeImpl {
 
   void UpdateMaxScrollOffset();
 
+  // Updates draw properties and render surface layer list
+  void UpdateDrawProperties();
+
+  void ClearRenderSurfaces();
+
+  const LayerList& RenderSurfaceLayerList() const;
+
   gfx::Size ContentSize() const;
 
   LayerImpl* LayerById(int id);
@@ -117,6 +126,10 @@ protected:
   // Persisted state
   int scrolling_layer_id_from_previous_tree_;
 
+  // List of visible layers for the most recently prepared frame. Used for
+  // rendering and input event hit testing.
+  LayerList render_surface_layer_list_;
+
   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 };