Add muted_output parameter to ACM

webrtc/modules/audio_coding/acm2/acm_receiver.h

Index: webrtc/modules/audio_coding/acm2/acm_receiver.h
diff --git a/webrtc/modules/audio_coding/acm2/acm_receiver.h b/webrtc/modules/audio_coding/acm2/acm_receiver.h
index 6fec1ffdda1f965ed94f3cb8bbd6114755bfa2ed..f37212c067b10c0af1e2c933fc650a05c524f4ab 100644
--- a/webrtc/modules/audio_coding/acm2/acm_receiver.h
+++ b/webrtc/modules/audio_coding/acm2/acm_receiver.h
@@ -82,11 +82,13 @@ class AcmReceiver {
   // Output:
   //   -audio_frame           : an audio frame were output data and
   //                            associated parameters are written to.
+  //   -muted                 : if true, the sample data in audio_frame is not
+  //                            populated, and must be interpreted as all zero.
   //
   // Return value             : 0 if OK.
   //                           -1 if NetEq returned an error.
   //
-  int GetAudio(int desired_freq_hz, AudioFrame* audio_frame);
+  int GetAudio(int desired_freq_hz, AudioFrame* audio_frame, bool* muted);
 
   //
   // Adds a new codec to the NetEq codec database.