Add new decoding statistics for muted output

webrtc/modules/audio_coding/acm2/call_statistics.h

Index: webrtc/modules/audio_coding/acm2/call_statistics.h
diff --git a/webrtc/modules/audio_coding/acm2/call_statistics.h b/webrtc/modules/audio_coding/acm2/call_statistics.h
index 888afea0a7ad9b136cd82ae4fbeb3170be322353..3993319e89a998fe5f7246152bb1a7829dd1b22e 100644
--- a/webrtc/modules/audio_coding/acm2/call_statistics.h
+++ b/webrtc/modules/audio_coding/acm2/call_statistics.h
@@ -37,8 +37,9 @@ class CallStatistics {
   ~CallStatistics() {}
 
   // Call this method to indicate that NetEq engaged in decoding. |speech_type|
-  // is the audio-type according to NetEq.
-  void DecodedByNetEq(AudioFrame::SpeechType speech_type);
+  // is the audio-type according to NetEq, and |muted| indicates if the decoded
+  // frame was produced in muted state.
+  void DecodedByNetEq(AudioFrame::SpeechType speech_type, bool muted);
 
   // Call this method to indicate that a decoding call resulted in generating
   // silence, i.e. call to NetEq is bypassed and the output audio is zero.