code: void addAveMapSlotRefillMsecs(int refillMsecs) {
      synchronized (mapSlotRefillMsecsQueue) {
        mapSlotRefillMsecsQueue.add(refillMsecs);
        if (mapSlotRefillMsecsQueue.size() >= maxRefillQueueSize) {
          mapSlotRefillMsecsQueue.remove();
        }
      }
    }
docs: Add this new refill time for the map slot refill queue.  Delete
  the oldest value if the maximum size has been met.
  
  @param refillMsecs Time to refill a map slot