[cc] Make LayerImpls point at LayerTreeImpl instead of LTHI

cc/solid_color_layer.cc

 // 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.
 
 #include "cc/solid_color_layer.h"
 
 #include "cc/solid_color_layer_impl.h"
 
 namespace cc {
 
-scoped_ptr<LayerImpl> SolidColorLayer::createLayerImpl(LayerTreeHostImpl* hostImpl)
+scoped_ptr<LayerImpl> SolidColorLayer::createLayerImpl(LayerTreeImpl* treeImpl)
 {
-    return SolidColorLayerImpl::create(hostImpl, id()).PassAs<LayerImpl>();
+    return SolidColorLayerImpl::create(treeImpl, id()).PassAs<LayerImpl>();
 }
 
 scoped_refptr<SolidColorLayer> SolidColorLayer::create()
 {
     return make_scoped_refptr(new SolidColorLayer());
 }
 
 SolidColorLayer::SolidColorLayer()
     : Layer()
 {
 }
 
 SolidColorLayer::~SolidColorLayer()
 {
 }
 
 void SolidColorLayer::setBackgroundColor(SkColor color)
 {
     setContentsOpaque(SkColorGetA(color) == 255);
     Layer::setBackgroundColor(color);
 }
 
 }  // namespace cc