protected function importConfigSplit($task, $cm_core_key) {
    $task->drush("pm-enable")->arg('config_split');
    $task->drush("config-import")->arg($cm_core_key);
    // Runs a second import to ensure splits are
    // both defined and imported.
    $task->drush("config-import")->arg($cm_core_key);
  }