Function wrapper

docs/lib/react.js:12396–12404

()

    if ("development" !== 'production') {
      var measuredFunc = null;
      var wrapper = function () {
        if (ReactPerf.enableMeasure) {
          if (!measuredFunc) {
            measuredFunc = ReactPerf.storedMeasure(objName, fnName, func);
          }
          return measuredFunc.apply(this, arguments);
        }
        return func.apply(this, arguments);
      };
      wrapper.displayName = objName + '_' + fnName;
      return wrapper;
    }