cc: Add message passing mechanism to micro benchmarking.

cc/debug/micro_benchmark.h

Index: cc/debug/micro_benchmark.h
diff --git a/cc/debug/micro_benchmark.h b/cc/debug/micro_benchmark.h
index f179fb9544d200ef30373fc4be88b1836c9469ea..c773933c861ff0c6c5de671c30b289fa59021999 100644
--- a/cc/debug/micro_benchmark.h
+++ b/cc/debug/micro_benchmark.h
@@ -24,15 +24,18 @@ class CC_EXPORT MicroBenchmark {
  public:
   typedef base::Callback<void(scoped_ptr<base::Value>)> DoneCallback;
 
-  explicit MicroBenchmark(const DoneCallback& callback);
+  explicit MicroBenchmark(const DoneCallback& callback, int id);

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

Since this id isn't used by any particular benchmark, do you think it's better
to have a set_id(int id) that the controller calls at the end of the if/else
if/else if creation thing. That way each individual benchmark doesn't have to
take an id in the constructor.

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

Done. The id is now set in ScheduleRun, after the benchmark was successfully
created.

   virtual ~MicroBenchmark();
 
   bool IsDone() const;
   virtual void DidUpdateLayers(LayerTreeHost* host);
+  int id() const { return id_; }
 
   virtual void RunOnLayer(Layer* layer);
   virtual void RunOnLayer(PictureLayer* layer);
 
+  virtual bool SendMessage(scoped_ptr<base::Value> value);
+
   bool ProcessedForBenchmarkImpl() const;
   scoped_ptr<MicroBenchmarkImpl> GetBenchmarkImpl(
       scoped_refptr<base::MessageLoopProxy> origin_loop);
@@ -47,6 +50,7 @@ class CC_EXPORT MicroBenchmark {
   DoneCallback callback_;
   bool is_done_;
   bool processed_for_benchmark_impl_;
+  int id_;
 };
 
 }  // namespace cc