test/trace_processor/power/power_rails_well_known.textproto

packet {
  power_rails {
    rail_descriptor {
      index: 4
      rail_name: "S3M_VDD_CPUCL1"
      subsys_name: "cpu"
      sampling_rate: 1023
    }
  }
}
packet {
  timestamp: 3000003
  power_rails {
    energy_data {
      index: 4
      timestamp_ms: 3
      energy: 333
    }
  }
}
packet {
  timestamp: 3000005
  power_rails {
    rail_descriptor {
      index: 3
      rail_name: "S2S_VDD_G3D"
      subsys_name: "gpu"
      sampling_rate: 1022
    }
    energy_data {
      index: 4
      timestamp_ms: 5
      energy: 666
    }
    energy_data {
      index: 3
      energy: 999
    }
    energy_data {
      index: 4
      timestamp_ms: 3
      energy: 0
    }
  }
}