public Builder setUsesChronometer(boolean b) {
            mUseChronometer = b;
            return this;
        }
Show the {@link Notification#when} field as a stopwatch.
<p>
Instead of presenting <code>when</code> as a timestamp, the notification will show an
automatically updating display of the minutes and seconds since <code>when</code>.
<p>
Useful when showing an elapsed time (like an ongoing phone call).

@see android.widget.Chronometer
@see Notification#when
android/android_framework/base/src/main/java/github/tornaco/android/thanos/core/compat/NotificationCompat.java