I've tested the new Perf tools on one of the screens in one app I'm working on and it works great :)

One thing I wanted also on the old one Perf tools was to be able to check whether the Perf tools are started or stopped, so basically exposing `ReactDebugTool`'s `isProfiling` variable. My use for that is that I have a keyboard shortcut (in development) bound to start/stop the Perf tools and currently I'm forced to maintain such a variable myself to know whether to start or stop (which gets out of sync if I start/stop the perf tools without the keyboard shortcut).

If you don't think it's worthwhile to expose `isProfiling` feel free to close this issue.

ReactDebugTool.beginProfiling();
}
function stop() {
  ReactDebugTool.endProfiling();
}
var ReactPerfAnalysis = {
  getLastMeasurements: getFlushHistory,
  getExclusive,
  getInclusive,
  getWasted,
  getOperations,
  printExclusive,
  printInclusive,
  printWasted,
  printOperations,
  start,
  stop,
  
  printDOM,
  getMeasurementsSummaryMap,
};
module.exports = ReactPerfAnalysis;