message: Set mid on IncomingStream
diff: @@ -230,11 +230,16 @@ class IncomingStream
  //Create single incoming source
  const source = new Native.RTPIncomingSourceGroup(type);
  + //Set mid
  + const mid = trackInfo.getMediaId();
  +
  //Get rid
  const rid = encodings[i][j].getId();
  - //Set rtp stream id
  + //Set rtp stream id and media id
  source.rid = new Native.StringFacade(rid);
  + if (mid)
  + source.mid = new Native.StringFacade(mid);
  //Get RID params
  const params = encodings[i][j].getParams();
  