Wire up AGC to the MediaStreamAudioProcessor

content/renderer/media/webrtc_audio_capturer.cc

Index: content/renderer/media/webrtc_audio_capturer.cc
diff --git a/content/renderer/media/webrtc_audio_capturer.cc b/content/renderer/media/webrtc_audio_capturer.cc
index ff4ecc71cb1617fb102b6cf6e5c6ceda5844d622..561965ebd803b603639085b9a0f0e2304b8a6777 100644
--- a/content/renderer/media/webrtc_audio_capturer.cc
+++ b/content/renderer/media/webrtc_audio_capturer.cc
@@ -478,16 +478,22 @@ void WebRtcAudioCapturer::Capture(media::AudioBus* audio_source,
   // Process and consume the data in the processor until there is not enough
   // data in the processor.
   int16* output = NULL;
+  int new_volume = 0;
   while (audio_processor->ProcessAndConsumeData(
-      audio_delay, current_volume, key_pressed, &output)) {
+      audio_delay, current_volume, key_pressed, &new_volume, &output)) {
     // Feed the post-processed data to the tracks.
     for (TrackList::ItemList::const_iterator it = tracks.begin();
          it != tracks.end(); ++it) {
       (*it)->Capture(output, audio_delay, current_volume, key_pressed,
                      need_audio_processing);
     }
-    // TODO(xians): Apply the new volume after AGC is working with the
-    // MediaStreamAudioProcessor.
+
+    if (new_volume) {
+      SetVolume(new_volume);
+
+      // Update the |current_volume| to avoid passing the old volume to AGC.
+      current_volume = new_volume;
+    }
   }
 }