cc: Add message passing mechanism to micro benchmarking.

cc/debug/micro_benchmark_controller.h

Index: cc/debug/micro_benchmark_controller.h
diff --git a/cc/debug/micro_benchmark_controller.h b/cc/debug/micro_benchmark_controller.h
index 7220dc1778fa7b0cef4570699056b272fba0608d..edf2278f39652564ae241b3a6d172896cdb5b1eb 100644
--- a/cc/debug/micro_benchmark_controller.h
+++ b/cc/debug/micro_benchmark_controller.h
@@ -28,17 +28,21 @@ class CC_EXPORT MicroBenchmarkController {
 
   void DidUpdateLayers();
 
-  bool ScheduleRun(const std::string& micro_benchmark_name,
-                   scoped_ptr<base::Value> value,
-                   const MicroBenchmark::DoneCallback& callback);
+  int ScheduleRun(const std::string& micro_benchmark_name,

[vmpstr, 2014/05/28 21:16:25]

Make a comment about the return value, please.

[ernstm, 2014/05/28 21:51:55]

Done.

+                  scoped_ptr<base::Value> value,
+                  const MicroBenchmark::DoneCallback& callback);
+
+  bool SendMessage(int id, scoped_ptr<base::Value> value);
 
   void ScheduleImplBenchmarks(LayerTreeHostImpl* host_impl);
 
  private:
   void CleanUpFinishedBenchmarks();
+  int GetNextIdAndIncrement();
 
   LayerTreeHost* host_;
   ScopedPtrVector<MicroBenchmark> benchmarks_;
+  int next_id_;

[vmpstr, 2014/05/28 21:16:25]

I think we only have one controller, but maybe make this static just to be on
the safe side?

[ernstm, 2014/05/28 21:51:55]

Done.

   scoped_refptr<base::MessageLoopProxy> main_controller_message_loop_;
 
   DISALLOW_COPY_AND_ASSIGN(MicroBenchmarkController);