Detect AudioInputStream muting and propagate to MediaStreamAudioSource.

media/audio/audio_input_device.cc

Index: media/audio/audio_input_device.cc
diff --git a/media/audio/audio_input_device.cc b/media/audio/audio_input_device.cc
index 66966381cdcc46ab9f264d3ac2db7ad854bf4d90..aac0808e20b3798e523c25b5dcf388d6260009d8 100644
--- a/media/audio/audio_input_device.cc
+++ b/media/audio/audio_input_device.cc
@@ -225,6 +225,11 @@ void AudioInputDevice::OnError() {
   }
 }
 
+void AudioInputDevice::OnMuted(bool is_muted) {
+  DCHECK(task_runner()->BelongsToCurrentThread());

[Max Morin, 2017/06/02 09:56:05]

I think you have to check |state_| here to ensure you're not accessing
|callback_| after it's freed (like in OnError).

[ossu-chromium, 2017/06/02 10:48:00]

Oh, you're probably right. I'll look into it.

+  callback_->OnCaptureMuted(is_muted);
+}
+
 void AudioInputDevice::OnIPCClosed() {
   DCHECK(task_runner()->BelongsToCurrentThread());
   state_ = IPC_CLOSED;