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Jamie Wong 864c065053 Fix importing of Trace Event Format files with no ts field on M events (#198)
The spec for the Trace Event Format technically requires that all entries have "ts" values, and they do in the profiles recorded using chrome://tracing. We don't actually use those values in the case of "M" (metadata) events, however, and they're semantically meaningless as far as I can tell, so let's stop requiring them.

This allows the files that @aras-p provided in #77 to import successfully.

Fixes #77
2019-01-22 21:51:23 -08:00

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[
{"pid": 0, "tid": 0, "ph": "M", "name": "process_name", "args": {"name": "p0"}},
{"pid": 0, "tid": 0, "ph": "M", "name": "thread_name", "args": {"name": "p0t0"}},
{"pid": 0, "tid": 0, "ph": "X", "name": "alpha", "ts": 0, "dur": 1},
{"pid": 0, "tid": 1, "ph": "M", "name": "thread_name", "args": {"name": "p0t1"}},
{"pid": 0, "tid": 1, "ph": "X", "name": "beta", "ts": 0, "dur": 1},
{"pid": 1, "tid": 0, "ph": "M", "name": "process_name", "args": {"name": "p1"}},
{"pid": 1, "tid": 0, "ph": "M", "name": "thread_name", "args": {"name": "p1t0"}},
{"pid": 1, "tid": 0, "ph": "X", "name": "gamma", "ts": 0, "dur": 1},
{"pid": 1, "tid": 1, "ph": "M", "name": "thread_name", "args": {"name": "p1t1"}},
{"pid": 1, "tid": 1, "ph": "X", "name": "delta", "ts": 0, "dur": 1},
{"pid": 2, "tid": 0, "ph": "M", "name": "thread_name", "args": {"name": "p2t0"}},
{"pid": 2, "tid": 0, "ph": "X", "name": "epsilon", "ts": 0, "dur": 1},
{"pid": 2, "tid": 1, "ph": "M", "name": "thread_name", "args": {"name": "p2t1"}},
{"pid": 2, "tid": 1, "ph": "X", "name": "phi", "ts": 0, "dur": 1},
{"pid": 3, "tid": 0, "ph": "M", "name": "process_name", "args": {"name": "p3"}},
{"pid": 3, "tid": 0, "ph": "X", "name": "zeta", "ts": 0, "dur": 1},
{"pid": 3, "tid": 1, "ph": "X", "name": "eta", "ts": 0, "dur": 1}
]