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Minimal test - lines (31, 75)

Code

namespace mozilla {

NS_IMETHODIMP
MainThreadIdlePeriod::GetIdlePeriodHint(TimeStamp* aIdleDeadline) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aIdleDeadline);

  TimeStamp now = TimeStamp::Now();
  TimeStamp currentGuess =
      now + TimeDuration::FromMilliseconds(kLongIdlePeriodMS);

  currentGuess = nsRefreshDriver::GetIdleDeadlineHint(currentGuess);
  if (XRE_IsContentProcess()) {
    currentGuess = gfx::VRManagerChild::GetIdleDeadlineHint(currentGuess);
  }
  currentGuess = NS_GetTimerDeadlineHintOnCurrentThread(currentGuess,
                                                        kMaxTimerThreadBound);

  // If the idle period is too small, then just return a null time
  // to indicate we are busy. Otherwise return the actual deadline.
  TimeDuration minIdlePeriod =
      TimeDuration::FromMilliseconds(StaticPrefs::idle_period_min());
  bool busySoon = currentGuess.IsNull() ||
                  (now >= (currentGuess - minIdlePeriod)) ||
                  currentGuess < mLastIdleDeadline;

  // During page load use higher minimum idle period.
  if (!busySoon && XRE_IsContentProcess() &&
      mozilla::dom::Document::HasRecentlyStartedForegroundLoads()) {
    TimeDuration minIdlePeriod = TimeDuration::FromMilliseconds(
        StaticPrefs::idle_period_during_page_load_min());
    busySoon = (now >= (currentGuess - minIdlePeriod));
  }

  if (!busySoon) {
    *aIdleDeadline = mLastIdleDeadline = currentGuess;
  }

  return NS_OK;
}

/* static */
float MainThreadIdlePeriod::GetLongIdlePeriod() { return kLongIdlePeriodMS; }

}  // namespace mozilla