| "track","process","thread","thread_process","ts","dur","category","name" |
| "[NULL]","[NULL]","t1","Browser",1000,100,"cat","event1_on_t1" |
| "[NULL]","[NULL]","t1","Browser",2000,200,"cat","event2_on_t1" |
| "[NULL]","[NULL]","t1","Browser",2000,200,"cat","event3_on_t1" |
| "[NULL]","[NULL]","t1","Browser",4000,0,"cat","event4_on_t1" |
| "[NULL]","[NULL]","t4","Browser",4000,100,"cat","event1_on_t3" |
| "[NULL]","[NULL]","t1","Browser",4300,0,"cat","float_counter_on_t1" |
| "[NULL]","[NULL]","t1","Browser",4500,0,"cat","float_counter_on_t1" |
