test/trace_processor/parsing/android_multiuser_switch.textproto

packet {
  ftrace_events {
    cpu: 3
    event {
      timestamp: 3000000000 # 3e9
      pid: 4064
      print {
        buf: "S|1204|onBeforeStartUser-10|0\n"
      }
    }
  }
}
packet {
  ftrace_events {
    cpu: 3
    event {
      timestamp: 3100000000
      pid: 4064
      print {
        buf: "F|1204|onBeforeStartUser-10|0\n"
      }
    }
  }
}
packet {
  ftrace_events {
    cpu: 2
    event {
      timestamp: 5200000000
      pid: 4065
      print {
        buf: "S|1204|launching: com.google.android.apps.nexuslauncher|0\n"
      }
    }
  }
}
packet {
  ftrace_events {
    cpu: 2
    event {
      timestamp: 7900000000 # 7.9e9
      pid: 4065
      print {
        buf: "F|1204|launching: com.google.android.apps.nexuslauncher|0\n"
      }
    }
  }
}