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 985a1213e27d044a9c94f2aeb87c2ef3f6aefac0..19fba1f9a6830adafcfc74cbdd0668ffad2ba2c3 100644
--- a/media/audio/audio_output_controller.h
+++ b/media/audio/audio_output_controller.h
@@ -222,6 +222,9 @@ class MEDIA_EXPORT AudioOutputController
   void BroadcastDataToDuplicationTargets(std::unique_ptr<AudioBus> audio_bus,
                                          base::TimeTicks reference_time);
 
+  // Log the current average power level measured by power_monitor_.
+  void LogAudioPowerLevel(const std::string& call_name);
+
   AudioManager* const audio_manager_;
   const AudioParameters params_;
   EventHandler* const handler_;
@@ -256,6 +259,9 @@ 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_;