test/trace_processor/tables/process_uids.textproto

packet {
  process_tree {
    processes {
      pid: 1
      ppid: 0
      cmdline: "init"
      uid: 0
    }
    processes {
      pid: 2
      ppid: 1
      cmdline: "com.google.android.gm:process"
      uid: 10001
    }
  }
}
packet {
  packages_list {
    packages {
      name: "com.google.android.gm"
      uid: 10001
    }
  }
}