Function addMethod

test/lib/canteen.js:239–244

(key, val)

      key, val, desc;

    function addMethod(key, val) {
      Canteen.prototype[key] = function() {
        this._pushMethod(key, arguments);
        return this.context[key].apply(this.context, arguments);
      };
    }

    for (key in proto) {
	  desc = Object.getOwnPropertyDescriptor(CanvasRenderingContext2D.prototype, key);