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It looks like this pull request may not have tests. Please make sure to add tests before merging. While there are exceptions to this rule, if this patch modifies code it is probably not an exception. Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing. |
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@rmacnak-google : would you please help me merge it as soon as all tests turn green in case that I won't have a chance to merge it this afternoon? |
This was referenced Aug 7, 2019
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TimelineEvents may not be sent if there aren't enough to form a group. Hence we should always use ExtensionEvent as the trigger. See also #37503
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The hack here is to flush the timeline events so the host that
waits for the 'Rasterized first useful frame' event won't hang.
Previously 'Widgets built first useful frame' didn't cause this
trouble because the GPU thread will naturally add more events later
and cause a fresh. The
Rasterized...event, however, is likelyto be the last (or nearly the last) event during the app start up.
rmacnak and I will figure out a better way to fix it next week.
We're having this quick hack now to fix our device lab performance
tests so we won't miss the data points.