fetch method

Implementation

Future<BackgroundFetchRegistration> fetch(String id, Object requests,
    [Map options]) {
  var options_dict = null;
  if (options != null) {
    options_dict = convertDartToNative_Dictionary(options);
  }
  return promiseToFuture<BackgroundFetchRegistration>(
      JS("", "#.fetch(#, #, #)", this, id, requests, options_dict));
}