[cc] Make LayerImpls point at LayerTreeImpl instead of LTHI

cc/layer_tree_impl.cc

 // 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.
 
 #include "cc/layer_tree_impl.h"
 
 #include "cc/layer_tree_host_common.h"
 #include "cc/layer_tree_host_impl.h"
 
 namespace cc {
 
-LayerTreeImpl::LayerTreeImpl(LayerTreeImplClient* client)
-    : client_(client)
+LayerTreeImpl::LayerTreeImpl(LayerTreeHostImpl* layer_tree_host_impl)
+    : layer_tree_host_impl_(layer_tree_host_impl)
     , source_frame_number_(-1)
     , hud_layer_(0)
     , root_scroll_layer_(0)
     , currently_scrolling_layer_(0)
     , scrolling_layer_id_from_previous_tree_(0) {
 }
 
 LayerTreeImpl::~LayerTreeImpl() {
 }
 
@@ skipping 20 matching lines @@
   currently_scrolling_layer_ = 0;
 
   if (root_layer_ && scrolling_layer_id_from_previous_tree_) {
     currently_scrolling_layer_ = LayerTreeHostCommon::findLayerInSubtree(
         root_layer_.get(),
         scrolling_layer_id_from_previous_tree_);
   }
 
   scrolling_layer_id_from_previous_tree_ = 0;
 
-  client_->OnCanDrawStateChangedForTree(this);
+  layer_tree_host_impl_->OnCanDrawStateChangedForTree(this);
 }
 
 scoped_ptr<LayerImpl> LayerTreeImpl::DetachLayerTree() {
   // Clear all data structures that have direct references to the layer tree.
   scrolling_layer_id_from_previous_tree_ =
     currently_scrolling_layer_ ? currently_scrolling_layer_->id() : 0;
   currently_scrolling_layer_ = NULL;
 
   return root_layer_.Pass();
 }
 
 void LayerTreeImpl::ClearCurrentlyScrollingLayer() {
   currently_scrolling_layer_ = NULL;
   scrolling_layer_id_from_previous_tree_ = 0;
 }
 
 } // namespace cc