Kaushik Iska ca5cc907a9 [tracing] SceneDisplayLag is a synchronous event (flutter/engine#17878)
This change converts it from an events that spans a time interval
to an event that occurs at an instant.

We also emit this trace event when there is no lag as opposed to
only when there was a lag to make it monotonous.

Co-authored-by: Kaushik Iska <kaushikiska@google.com>
2020-04-23 10:53:45 -07:00
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