message: fix(zone.js): jest getRealSystemTime should return native time
  `jest.getRealSystemTime()` should return native `Date.now()`, the
  current implemenation return the wrong value which is the fixed
  number.
  PR Close
diff: @@ -200,7 +200,7 @@ Zone.__load_patch('jest', (context: any, Zone: ZoneType, api: _ZonePrivate) => {
  return function(self: any, args: any[]) {
  const fakeAsyncZoneSpec = Zone.current.get('FakeAsyncTestZoneSpec');
  if (fakeAsyncZoneSpec && isPatchingFakeTimer()) {
  - return fakeAsyncZoneSpec.getCurrentRealTime(args[0]);
  + return fakeAsyncZoneSpec.getRealSystemTime();
  } else {
  return delegate.apply(self, args);
  }
  