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There's some speculation that MainThreadFreezeDetector is catching too
many hangs that eventually recover, especially on change from foreground
to background.  If a hang report is generated, but the app recovers,
return early before |reportGenerated| can be set.


Change-Id: Ib4a4f9b1db44eeb42ce15da7f312f4df0033e401
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536386
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Auto-Submit: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833884}