Paint or domContentLoadedEnd may be used as
   *     an approximation.
   * @param {number} searchEnd - The right boundary for our search for quiet
   *     window. This is either the start of next navigationStart request, or
   *     end of traces.
   * @param {number} domContentLoadedEnd - Timestamp of domContentLoadedEnd
   *     event for the main loading frame.
   * @param {Array.<!tr.model.TimedEvent>} longTasks - Main thread tasks longer
   *     than 50ms overlapping with the search window.
   * @re