internal SyncData(Clock syncClock)
{
Debug.Assert(syncClock != null);
Debug.Assert(syncClock.GetCanSlip());
Debug.Assert(syncClock.IsRoot || syncClock._timeline.BeginTime.HasValue); // Only roots may later validate their _beginTime
_syncClock = syncClock;
UpdateClockBeginTime(); // This will update the remaining dependencies
}