Refactor MutatorHostClient from LayerTreeHost to LayerTree.

cc/debug/micro_benchmark.h

 // Copyright 2013 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_DEBUG_MICRO_BENCHMARK_H_
 #define CC_DEBUG_MICRO_BENCHMARK_H_
 
 #include <memory>
 
 #include "base/callback.h"
 #include "cc/base/cc_export.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 class Value;
 }  // namespace base
 
 namespace cc {
 
-class LayerTreeHost;
+class LayerTree;
 class Layer;
 class PictureLayer;
 class MicroBenchmarkImpl;
 class CC_EXPORT MicroBenchmark {
  public:
   typedef base::Callback<void(std::unique_ptr<base::Value>)> DoneCallback;
 
   explicit MicroBenchmark(const DoneCallback& callback);
   virtual ~MicroBenchmark();
 
   bool IsDone() const;
-  virtual void DidUpdateLayers(LayerTreeHost* host);
+  virtual void DidUpdateLayers(LayerTree* layer_tree);
   int id() const { return id_; }
   void set_id(int id) { id_ = id; }
 
   virtual void RunOnLayer(Layer* layer);
   virtual void RunOnLayer(PictureLayer* layer);
 
   virtual bool ProcessMessage(std::unique_ptr<base::Value> value);
 
   bool ProcessedForBenchmarkImpl() const;
   std::unique_ptr<MicroBenchmarkImpl> GetBenchmarkImpl(
       scoped_refptr<base::SingleThreadTaskRunner> origin_task_runner);
 
  protected:
   void NotifyDone(std::unique_ptr<base::Value> result);
 
   virtual std::unique_ptr<MicroBenchmarkImpl> CreateBenchmarkImpl(
       scoped_refptr<base::SingleThreadTaskRunner> origin_task_runner);
 
  private:
   DoneCallback callback_;
   bool is_done_;
   bool processed_for_benchmark_impl_;
   int id_;
 };
 
 }  // namespace cc
 
 #endif  // CC_DEBUG_MICRO_BENCHMARK_H_