Bug 1295296 - Ignore video tracks in MediaStreamAudioSourceNode. r=jesup

MozReview-Commit-ID: 1NeFS5wIpxC

--HG--
extra : transplant_source : %CB%0A%A7c%5C%EF%9A%EA%E6D%AE%9C%8F%CC%16%3E%9E%9E2a

dom/media/webaudio/MediaStreamAudioSourceNode.cpp

@@ -96,6 +96,8 @@ void
 MediaStreamAudioSourceNode::AttachToTrack(const RefPtr<MediaStreamTrack>& aTrack)
 {
   MOZ_ASSERT(!mInputTrack);
+  MOZ_ASSERT(aTrack->AsAudioStreamTrack());
+
   if (!mStream) {
     return;
   }
@@ -148,6 +150,10 @@ MediaStreamAudioSourceNode::NotifyTrackAdded(const RefPtr<MediaStreamTrack>& aTr
     return;
   }
 
+  if (!aTrack->AsAudioStreamTrack()) {
+    return;
+  }
+
   AttachToTrack(aTrack);
 }