1. @DomName('RTCPeerConnection.getStreamById')
  2. @DocsEditable()
MediaStream getStreamById(String streamId)

Source 

@DomName('RTCPeerConnection.getStreamById')
@DocsEditable()
MediaStream getStreamById(String streamId) =>
    _blink.BlinkRTCPeerConnection.instance
        .getStreamById_Callback_1_(this, streamId);