[
  { "pid": 0, "tid": 0, "ph": "X", "ts": 0, "dur": 10, "name": "alpha" },
  { "pid": 0, "tid": 0, "ph": "X", "ts": 1, "dur": 1, "name": "beta" },
  { "pid": 0, "tid": 0, "ph": "X", "ts": 1, "dur": 1, "name": "gamma" },
  { "pid": 0, "tid": 0, "ph": "X", "ts": 5, "dur": 1, "name": "gamma" },
  { "pid": 0, "tid": 0, "ph": "X", "ts": 5, "dur": 1, "name": "beta" }
]