Reduce power logging and UMA stats when AGC is disabled

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 3c3c3278f7d0098fc748ec43d33a245fc9b39673..b7aecfa7d625e89f66ff9be54db559100a162bfc 100644
--- a/media/audio/audio_input_controller.h
+++ b/media/audio/audio_input_controller.h
@@ -188,7 +188,8 @@ class MEDIA_EXPORT AudioInputController
       const std::string& device_id,
       // External synchronous writer for audio controller.
       SyncWriter* sync_writer,
-      UserInputMonitor* user_input_monitor);
+      UserInputMonitor* user_input_monitor,
+      const bool agc_is_enabled);
 
   // Factory method for creating an AudioInputController with an existing
   // |stream| for low-latency mode, taking ownership of |stream|. The stream
@@ -221,10 +222,6 @@ class MEDIA_EXPORT AudioInputController
   // to muted and 1.0 to maximum volume.
   virtual void SetVolume(double volume);
 
-  // Sets the Automatic Gain Control (AGC) state of the input stream.
-  // Changing the AGC state is not supported while recording is active.
-  virtual void SetAutomaticGainControl(bool enabled);
-
   // AudioInputCallback implementation. Threading details depends on the
   // device-specific implementation.
   virtual void OnData(AudioInputStream* stream,
@@ -267,7 +264,8 @@ class MEDIA_EXPORT AudioInputController
 
   AudioInputController(EventHandler* handler,
                        SyncWriter* sync_writer,
-                       UserInputMonitor* user_input_monitor);
+                       UserInputMonitor* user_input_monitor,
+                       const bool agc_is_enabled);
   virtual ~AudioInputController();
 
   // Methods called on the audio thread (owned by the AudioManager).
@@ -282,7 +280,6 @@ class MEDIA_EXPORT AudioInputController
   void DoClose();
   void DoReportError();
   void DoSetVolume(double volume);
-  void DoSetAutomaticGainControl(bool enabled);
   void DoOnData(scoped_ptr<AudioBus> data);
   void DoLogAudioLevels(float level_dbfs, int microphone_volume_percent);
 
@@ -351,6 +348,8 @@ class MEDIA_EXPORT AudioInputController
 
   UserInputMonitor* user_input_monitor_;
 
+  const bool agc_is_enabled_;
+
 #if defined(AUDIO_POWER_MONITORING)
   // Enabled in DoCrete() but not in DoCreateForStream().
   bool power_measurement_is_enabled_;