cc: Plumbing for impl thread micro benchmarks

cc/debug/micro_benchmark.cc

 // 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.
 
 #include "cc/debug/micro_benchmark.h"
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
+#include "cc/debug/micro_benchmark_impl.h"
 
 namespace cc {
 
 MicroBenchmark::MicroBenchmark(const DoneCallback& callback)
     : callback_(callback), is_done_(false) {}
 
 MicroBenchmark::~MicroBenchmark() {}
 
 bool MicroBenchmark::IsDone() const {
   return is_done_;
 }
 
 void MicroBenchmark::DidUpdateLayers(LayerTreeHost* host) {}
 
 void MicroBenchmark::NotifyDone(scoped_ptr<base::Value> result) {
   callback_.Run(result.Pass());
   is_done_ = true;
 }
 
 void MicroBenchmark::RunOnLayer(Layer* layer) {}
 
 void MicroBenchmark::RunOnLayer(PictureLayer* layer) {}
 
+scoped_ptr<MicroBenchmarkImpl> MicroBenchmark::CreateBenchmarkImpl(
+    scoped_refptr<base::MessageLoopProxy> origin_loop) {
+  return make_scoped_ptr<MicroBenchmarkImpl>(NULL);
+}
+
 }  // namespace cc