cc: Plumbing for impl thread micro benchmarks

cc/debug/unittest_only_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_UNITTEST_ONLY_BENCHMARK_H_
 #define CC_DEBUG_UNITTEST_ONLY_BENCHMARK_H_
 
+#include "base/memory/weak_ptr.h"
 #include "cc/debug/micro_benchmark.h"
 
 namespace cc {
 
-class UnittestOnlyBenchmark : public MicroBenchmark {
+class CC_EXPORT UnittestOnlyBenchmark : public MicroBenchmark {
  public:
-  explicit UnittestOnlyBenchmark(scoped_ptr<base::Value> value,
-                                 const DoneCallback& callback);
+  UnittestOnlyBenchmark(scoped_ptr<base::Value> value,
+                        const DoneCallback& callback);
   virtual ~UnittestOnlyBenchmark();
 
   virtual void DidUpdateLayers(LayerTreeHost* host) OVERRIDE;
+
+ protected:
+  virtual scoped_ptr<MicroBenchmarkImpl> CreateBenchmarkImpl(
+      scoped_refptr<base::MessageLoopProxy> origin_loop) OVERRIDE;
+
+ private:
+  void RecordImplResults(scoped_ptr<base::Value> results);
+
+  bool create_impl_benchmark_;
+  base::WeakPtrFactory<UnittestOnlyBenchmark> weak_ptr_factory_;
 };
 
 }  // namespace cc
 
 #endif  // CC_DEBUG_UNITTEST_ONLY_BENCHMARK_H_