test/trace_processor/chrome/chrome_slice_names.textproto

packet {
  trusted_packet_sequence_id: 1
  timestamp: 1000
  track_event {
    categories: "cat"
    name: "Looper.Dispatch: class1"
    type: 3
  }
}
packet {
  trusted_packet_sequence_id: 1
  timestamp: 2000
  track_event {
    categories: "cat"
    name: "name2"
    type: 3
  }
}
packet {
  chrome_metadata {
    chrome_version_code: 123
  }
}