TimelineTask({String category: 'Dart'})

Create a task. taskId will be set by the system. Optionally you can specify a category name.

Source

TimelineTask({String category: 'Dart'})
    : _taskId = _getNextAsyncId(),
      category = category {
  if (category is! String) {
    throw new ArgumentError.value(category,
                                  'category',
                                  'Must be a String');
  }
}