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The end_time of SendBeginMainToCommit would be set by the time that
OnFinishImplFrame is received, which might be before the MainFrameAbort.
This could result into TotalLatency being smaller than the sum of stages.

Bug: chromium:1048696
Change-Id: I551c495da084c1887410495caab28de91cfa63e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2062575Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Behdad Bakhshinategh <behdadb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747790}