code: function triggerWithArray(dispatcher, eventName, argsArray) {
          var triggerArgs = [eventName].concat(argsArray);
          dispatcher.trigger.apply(dispatcher, triggerArgs);
      }
docs: Utility for calling on() with an array of arguments to pass to event handlers (rather than a varargs
  list). makeEventDispatcher() must have previously been called on 'dispatcher'.
  @param {!Object} dispatcher
  @param {string} eventName
  @param {!Array.<*>} argsArray