[cc] Make LayerImpls point at LayerTreeImpl instead of LTHI

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 "cc/layer_impl.h"
 
 namespace cc {
 
 class LayerTreeHostImpl;
 class LayerTreeImpl;
 class HeadsUpDisplayLayerImpl;
 
-class CC_EXPORT LayerTreeImplClient {
- public:
-  virtual void OnCanDrawStateChangedForTree(LayerTreeImpl*)  = 0;
-
- protected:
-  virtual ~LayerTreeImplClient() {}
-};
-
 class CC_EXPORT LayerTreeImpl {
  public:
-  static scoped_ptr<LayerTreeImpl> create(LayerTreeImplClient* client)
+  static scoped_ptr<LayerTreeImpl> create(LayerTreeHostImpl* layer_tree_host_impl)
   {
-    return make_scoped_ptr(new LayerTreeImpl(client));
+    return make_scoped_ptr(new LayerTreeImpl(layer_tree_host_impl));
   }
   virtual ~LayerTreeImpl();
 
+  // Methods called by the layer tree.
+  // ---------------------------------------------------------------------------
+  // TODO(nduca): Remove this and have layers call through this class.
+  LayerTreeHostImpl* layer_tree_host_impl() const { return layer_tree_host_impl_; }
+
+  // Other public methods
+  // ---------------------------------------------------------------------------
   LayerImpl* RootLayer() const { return root_layer_.get(); }
   void SetRootLayer(scoped_ptr<LayerImpl>);
   scoped_ptr<LayerImpl> DetachLayerTree();
 
   int source_frame_number() const { return source_frame_number_; }
   void set_source_frame_number(int frame_number) { source_frame_number_ = frame_number; }
 
   HeadsUpDisplayLayerImpl* hud_layer() { return hud_layer_; }
   void set_hud_layer(HeadsUpDisplayLayerImpl* layer_impl) { hud_layer_ = layer_impl; }
 
   LayerImpl* root_scroll_layer() { return root_scroll_layer_; }
   void set_root_scroll_layer(LayerImpl* layer_impl) { root_scroll_layer_ = layer_impl; }
 
   LayerImpl* currently_scrolling_layer() { return currently_scrolling_layer_; }
   void set_currently_scrolling_layer(LayerImpl* layer_impl) { currently_scrolling_layer_ = layer_impl; }
 
   void ClearCurrentlyScrollingLayer();
 
 protected:
-  LayerTreeImpl(LayerTreeImplClient* client);
+  LayerTreeImpl(LayerTreeHostImpl* layer_tree_host_impl);
 
-  LayerTreeImplClient* client_;
+  LayerTreeHostImpl* layer_tree_host_impl_;
   int source_frame_number_;
   scoped_ptr<LayerImpl> root_layer_;
   HeadsUpDisplayLayerImpl* hud_layer_;
   LayerImpl* root_scroll_layer_;
   LayerImpl* currently_scrolling_layer_;
 
   // Persisted state
   int scrolling_layer_id_from_previous_tree_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 };
 
 }
 
 #endif  // CC_LAYER_TREE_IMPL_H_