test/trace_processor/process_tracking/process_tracking.out

"tid","pid","pname","tname"
10,10,"process1","p1-t0"
11,"[NULL]","[NULL]","p1-t1"
12,10,"process1","p1-t2"
20,20,"process_2","p2-t0"
21,20,"process_2","p2-t1"
22,20,"process_2","p2-t2"
30,30,"process_3","p3-t0"
31,30,"process_3","p3-t1"
31,40,"process_4","p4-t1"
32,30,"process_3","p3-t2"
33,30,"process_3","p3-t3"
34,30,"process_3","p3-t4"
40,40,"process_4","p4-t0"