test/trace_processor/graphics/drm_vblank.textproto

packet {
  ftrace_events {
    cpu: 0
    event {
      timestamp: 6159770881976
      pid: 0
      drm_vblank_event {
        crtc: 0
        high_prec: 1
        seq: 3551
        time: 6159771267407
      }
    }
  }
}
packet {
  ftrace_events {
    cpu: 4
    event {
      timestamp: 6159770993376
      pid: 144
      drm_vblank_event_delivered {
        crtc: 0
        file: 18446743526216291840
        seq: 3551
      }
    }
  }
}