function fireAltGraphKey(
    keycode, keyPressKeyCode, extraProperties = undefined,
    element = undefined) {
  return testingEvents.fireNonAsciiKeySequence(
      element || targetDiv, keycode, keyPressKeyCode, extraProperties);
}
Simulates a complete keystroke (keydown, keypress, and keyup) when typing
a non-ASCII character.
@param {number} keycode The keycode of the keydown and keyup events.
@param {number} keyPressKeyCode The keycode of the keypress event.
@param {Object=} extraProperties Event properties to be mixed into the
    BrowserEvent.
@param {EventTarget=} element Optional target for the event.
@return {boolean} The returnValue of the sequence: false if preventDefault()
    was called on any of the events, true otherwise.