rams, model) {
    const navigationInfos = getNavigationInfos(model);
    if (navigationInfos.length === 0) {
      return;
    }
    navigationInfos.forEach(navInfo => {
      const navigationStart = navInfo.navigationStart.start;
      const navigationEnd = navInfo.navigationEndTime;
      // Produce a list of { start, end }, relative to navigation-start.
      const startEndPairs =
          splitOneRangeIntoPerSecondRanges(navigationStart, navigationEnd);
      const breakdownList = startEndPairs.map(p 