Propagate muted state from MediaStreamAudioSource into JS.

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 19ea853e9727902b227536ea5badf5efc3feadc6..649ea15f919f523f2cefe905dbe0650a7f07bac1 100644
--- a/content/renderer/media/media_stream_audio_source.cc
+++ b/content/renderer/media/media_stream_audio_source.cc
@@ -148,9 +148,10 @@ void MediaStreamAudioSource::StopSourceOnError(const std::string& why) {
 }
 
 void MediaStreamAudioSource::SetMutedState(bool muted_state) {
-  // TODO(ossu): Propagate this muted state into blink.
-  DVLOG(3) << "MediaStreamAudioSource::SetMutedState state=" << muted_state
-           << " (not implemented)";
+  DVLOG(3) << "MediaStreamAudioSource::SetMutedState state=" << muted_state;
+  task_runner_->PostTask(
+      FROM_HERE, base::Bind(&MediaStreamSource::SetSourceMuted, GetWeakPtr(),
+                            muted_state));
 }
 
 }  // namespace content