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 } }