WPCOM_VIP_Support_User::promote_user_to_vip_support PHP Method

    protected function promote_user_to_vip_support($user_id)
    {
        $user = new WP_User($user_id);
        $user->set_role(WPCOM_VIP_Support_Role::VIP_SUPPORT_ROLE);
        if (is_multisite()) {
            require_once ABSPATH . '/wp-admin/includes/ms.php';
            grant_super_admin($user_id);
        }
        update_user_meta($user->ID, $GLOBALS['wpdb']->get_blog_prefix() . 'user_level', 10);
    }