1. @DomName('AudioTrackList.getTrackById')
  2. @DocsEditable()
  3. @Experimental()
AudioTrack getTrackById(String id)

Source 

@DomName('AudioTrackList.getTrackById')
@DocsEditable()
@Experimental() // untriaged
AudioTrack getTrackById(String id) =>
    _blink.BlinkAudioTrackList.instance.getTrackById_Callback_1_(this, id);