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Adds a script that can be used to find unexpected passes of tests suites
on the CI bots. The intended use case for this is to cut down on the
number of stale test suppressions in the GPU tests, but it could
potentially be useful for other test types.

Bug: 998329
Change-Id: Iac09971a8545721bdf1c7e877477e4a56b2a7969
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2386423
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803995}