function AddRuleListItem(list) {
    var el = cr.doc.createElement('div');
    el.dataItem_ = {};
    el.list_ = list;
    el.__proto__ = AddRuleListItem.prototype;
    el.decorate();

    return el;
  }
Create a new list item to add a rule.
@param {!RuleList} list The rule list containing this item.
@constructor
@extends {AddRuleListItem}