igationEndTime;const startEndPairs=splitOneRangeIntoPerSecondRanges(navigationStart,navigationEnd);const breakdownList=startEndPairs.map(p=>{const wallHistogramName=`wall_${p.start}_to_${p.end}`;const wallHistogramDescription=`Wall-clock time ${p.start} to ${p.end} breakdown`;const cpuHistogramName=`cpu_${p.start}_to_${p.end}`;const cpuHistogramDescription=`CPU time ${p.start} to ${p.end} breakdown`;const pid=navInfo.rendererHelper.pid;const breakdownTree=getWallTimeBreakdownTree(navInfo.rendere...