1. DomName('StashedPortCollection.add')
  2. DocsEditable()
  3. Experimental()
StashedMessagePort add(String name, MessagePort port)

Source 

@DomName('StashedPortCollection.add')
@DocsEditable()
@Experimental() // untriaged
StashedMessagePort add(String name, MessagePort port) => _blink.BlinkStashedPortCollection.instance.add_Callback_2_(this, name, port);