uint64_t RapporHistogramBucketIndex(base::TimeDelta time) {
  int64_t seconds = time.InSeconds();
  if (seconds < 2)
    return 0;
  if (seconds < 4)
    return 1;
  if (seconds < 8)
    return 2;
  if (seconds < 16)
    return 3;
  if (seconds < 32)
    return 4;
  return 5;
}

Unknown