code: @Override
  	protected void onStopwatchSplit(Stopwatch stopwatch, Split split) {
  		Buckets buckets = getOrCreateBuckets(stopwatch);
  		long value = split.runningFor();
  		if (buckets == null) {
  			// Warming up
  			getOrCreateBucketsValues(stopwatch).add(value);
  		} else {
  			// Warm
  			buckets.addValue(value);
  			buckets.log(split);
  		}
  	}
docs: Called when there is a new split on a Stopwatch, either
  {@link #onStopwatchStop} or {@link #onStopwatchAdd}.
  If buckets have been initialized, the value is added to appropriate bucket.
  Else if stopwatch is warming up value is added to value list.