function createPerfMeasurement(id, name) {
        var pm = new PerfMeasurement(id, name);
        exports[id] = pm;

        return pm;
    }
Create a new PerfMeasurement key. Adds itself to the module export.
Can be accessed on the module, e.g. PerfUtils.MY_PERF_KEY.

@param {!string} id Unique ID for this measurement name
@param {!name} name A short name for this measurement