Added a level indicator to new mixer.

webrtc/modules/audio_mixer/new_audio_conference_mixer.h

Index: webrtc/modules/audio_mixer/new_audio_conference_mixer.h
diff --git a/webrtc/modules/audio_mixer/new_audio_conference_mixer.h b/webrtc/modules/audio_mixer/new_audio_conference_mixer.h
index 561cf88604f58cf51ee4352f10e8e7df0bd6f1e2..55c17eda1195728ab6695ce8eed5be2dfd5204f2 100644
--- a/webrtc/modules/audio_mixer/new_audio_conference_mixer.h
+++ b/webrtc/modules/audio_mixer/new_audio_conference_mixer.h
@@ -59,6 +59,11 @@ class NewAudioConferenceMixer {
   virtual bool AnonymousMixabilityStatus(
       const MixerAudioSource& audio_source) const = 0;
 
+  // Output level functions from VoEVolumeControl

[minyue-webrtc, 2016/08/11 10:27:33]

would be good to note the unit of level somewhere, but yes, you only take the
value that AudioLevel returns, then may be good to refer AudioLevel in the
comment.

[aleloi, 2016/08/11 12:15:19]

Thank you! Updated documentation in next patch set.

+  virtual uint32_t GetSpeechOutputLevel() = 0;
+
+  virtual uint32_t GetSpeechOutputLevelFullRange() = 0;
+
  protected:
   NewAudioConferenceMixer() {}
 };