Added logging of average power levels to AudioOutputController.

media/audio/audio_output_controller.h

Index: media/audio/audio_output_controller.h
diff --git a/media/audio/audio_output_controller.h b/media/audio/audio_output_controller.h
index 8e8bbac115d7fde78624f993f331e96ca8d02414..4b17bd5674c70f8583a9d79674b20bfdee810f33 100644
--- a/media/audio/audio_output_controller.h
+++ b/media/audio/audio_output_controller.h
@@ -257,6 +257,9 @@ class MEDIA_EXPORT AudioOutputController
   // Scans audio samples from OnMoreData() as input to compute power levels.
   AudioPowerMonitor power_monitor_;
 
+  // Updated each time a power measurement is logged.
+  base::TimeTicks last_audio_level_log_time_;
+
   // Flags when we've asked for a stream to start but it never did.
   base::AtomicRefCount on_more_io_data_called_;
   std::unique_ptr<base::OneShotTimer> wedge_timer_;