code: public final void schedule (long initialDelay, long repeatDelay)
      {
          if (!_mgr.isRegisteredFrameParticipant(this)) {
              _mgr.registerFrameParticipant(this);
          }
  
          _repeatDelay = repeatDelay;
          _initDelay = initialDelay;
          _nextTime = -1;
      }
docs: Schedule the interval to execute repeatedly with the specified
  initial delay and repeat delay.
  Supersedes any previous schedule that this Interval may have had.