test/trace_processor/atrace/android_async_slice.textproto

packet {
  ftrace_events {
    cpu: 3
    event {
      timestamp: 74289018336
      pid: 4064
      print {
        ip: 18446743562018522420
        buf: "S|1204|launching: com.android.chrome|0\n"
      }
    }
  }
}
packet {
  ftrace_events {
    cpu: 2
    event {
      timestamp: 74662603008
      pid: 1257
      print {
        ip: 18446743562018522420
        buf: "F|1204|launching: com.android.chrome|0\n"
      }
    }
  }
}