Detect AudioInputStream muting and propagate to MediaStreamAudioSource.

content/renderer/media/media_stream_audio_source.cc

Index: content/renderer/media/media_stream_audio_source.cc
diff --git a/content/renderer/media/media_stream_audio_source.cc b/content/renderer/media/media_stream_audio_source.cc
index be556185ada9f1330dc8cd2194445dca4822803e..649ea15f919f523f2cefe905dbe0650a7f07bac1 100644
--- a/content/renderer/media/media_stream_audio_source.cc
+++ b/content/renderer/media/media_stream_audio_source.cc
@@ -147,4 +147,11 @@ void MediaStreamAudioSource::StopSourceOnError(const std::string& why) {
       FROM_HERE, base::Bind(&MediaStreamSource::StopSource, GetWeakPtr()));
 }
 
+void MediaStreamAudioSource::SetMutedState(bool muted_state) {
+  DVLOG(3) << "MediaStreamAudioSource::SetMutedState state=" << muted_state;
+  task_runner_->PostTask(
+      FROM_HERE, base::Bind(&MediaStreamSource::SetSourceMuted, GetWeakPtr(),
+                            muted_state));
+}
+
 }  // namespace content