test/trace_processor/chrome/modified_rail_modes.out

"id","ts","dur","mode"
2,0,1000000000,"response"
3,1000000000,1950000000,"foreground_idle"
4,2950000000,333333324,"animation"
5,3283333324,216666676,"foreground_idle"
6,3500000000,1000000000,"background"