addEventListener method

void addEventListener (String type, EventListener listener, [ bool useCapture ])

Implementation 

void addEventListener(String type, EventListener listener,
    [bool useCapture]) {
  // Messages posted to ports are initially paused, allowing listeners to be
  // setup, start() needs to be explicitly invoked to begin handling messages.
  if (type == 'message') {
    _start();
  }

  super.addEventListener(type, listener, useCapture);
}