sendKeyEvents method
Sends the key events.  This function is expected to be used by virtual
keyboards.  When key(s) on a virtual keyboard is pressed by a user, this
function is used to propagate that event to the system.
returns Called when the operation completes.
Implementation
Future<void> sendKeyEvents(SendKeyEventsParameters parameters) async {
  await promiseToFuture<void>(
      $js.chrome.input.ime.sendKeyEvents(parameters.toJS));
}