function normalizeTimingEntries(timings) {
  let baseTime = 0;
  for (const timing of timings) {
    // @ts-expect-error: Value actually is writeable at this point.
    timing.startTime = baseTime++;
    // @ts-expect-error: Value actually is writeable at this point.
    timing.duration = 1;
  }
}
Normalize timing data so it doesn't change every update.
@param {LH.Result.MeasureEntry[]} timings