Add new decoding statistics for muted output

webrtc/modules/audio_coding/acm2/call_statistics.cc

Index: webrtc/modules/audio_coding/acm2/call_statistics.cc
diff --git a/webrtc/modules/audio_coding/acm2/call_statistics.cc b/webrtc/modules/audio_coding/acm2/call_statistics.cc
index 4441932c8c4306608a8a22c1d5e0b26ab2282685..9a6af089d0589ae811d25f8465749f62b33fa434 100644
--- a/webrtc/modules/audio_coding/acm2/call_statistics.cc
+++ b/webrtc/modules/audio_coding/acm2/call_statistics.cc
@@ -16,8 +16,12 @@ namespace webrtc {
 
 namespace acm2 {
 
-void CallStatistics::DecodedByNetEq(AudioFrame::SpeechType speech_type) {
+void CallStatistics::DecodedByNetEq(AudioFrame::SpeechType speech_type,
+                                    bool muted) {
   ++decoding_stat_.calls_to_neteq;
+  if (muted) {
+    ++decoding_stat_.decoded_muted_output;
+  }
   switch (speech_type) {
     case AudioFrame::kNormalSpeech: {
       ++decoding_stat_.decoded_normal;