Add AudioInputControllerCaptureStartupSuccess UMA

media/audio/audio_input_controller.h

Index: media/audio/audio_input_controller.h
diff --git a/media/audio/audio_input_controller.h b/media/audio/audio_input_controller.h
index ac1a690f58daeffc580e236681b10b6d0fb24b59..3facfb511d18670a4a6d2ce0e0f19071099fe0e8 100644
--- a/media/audio/audio_input_controller.h
+++ b/media/audio/audio_input_controller.h
@@ -253,6 +253,10 @@ class MEDIA_EXPORT AudioInputController
   void DoSetAutomaticGainControl(bool enabled);
   void DoOnData(scoped_ptr<uint8[]> data, uint32 size);
 
+  // Method to check if we get recorded data after a stream was started,
+  // and log the result to UMA.
+  void FirstCheckForNoData();
+
   // Method which ensures that OnError() is triggered when data recording
   // times out. Called on the audio thread.
   void DoCheckForNoData();