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If a 'begin main frame' is aborted (e.g. because of no visual damage),
then use the time of the abort as the termination time for the
trace-event, rather than when the reporter gets replaced by a new
reporter for the next frame, or when the scheduler drops the reporter
after the frame's deadline.

BUG=none

Change-Id: I4fdb32f8793eb7228439937759bdf12f0f3c0798
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2138963
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Behdad Bakhshinategh <behdadb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757979}