Adding AGC stats in combination with report of missing input audio on Mac

media/audio/agc_audio_stream.h

Index: media/audio/agc_audio_stream.h
diff --git a/media/audio/agc_audio_stream.h b/media/audio/agc_audio_stream.h
index b0117e1962c1e9b7619bd0ef6c2671b3e8fc9ed2..1d5ad93ee50aad49755727cdc0ce027c5404bf08 100644
--- a/media/audio/agc_audio_stream.h
+++ b/media/audio/agc_audio_stream.h
@@ -132,6 +132,12 @@ class MEDIA_EXPORT AgcAudioStream : public AudioInterface {
     *normalized_volume = normalized_volume_;
   }
 
+  // Gets the current automatic gain control state.
+  bool GetAutomaticGainControl() override {
+    DCHECK(thread_checker_.CalledOnValidThread());
+    return agc_is_enabled_;
+  }
+
  private:
   // Sets the automatic gain control (AGC) to on or off. When AGC is enabled,
   // the microphone volume is queried periodically and the volume level can
@@ -145,12 +151,6 @@ class MEDIA_EXPORT AgcAudioStream : public AudioInterface {
     return true;
   }
 
-  // Gets the current automatic gain control state.
-  bool GetAutomaticGainControl() override {
-    DCHECK(thread_checker_.CalledOnValidThread());
-    return agc_is_enabled_;
-  }
-
   // Takes a new microphone volume sample and stores it in |normalized_volume_|.
   // Range is normalized to [0.0,1.0] or [0.0, 1.5] on Linux.
   // This method is called periodically when AGC is enabled and always on the