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Fixes/improves the GPU unexpected pass finder script in the following
ways:

1. Adds support for preventing expectations from being auto-removed via
   block or inline comments. This is mainly intended for cases where the
   flake rate for a test is low enough that the script does not reliably
   find a flake with a reasonable sample size.
2. Works around the suite name being reported to typ/ResultDB not being
   the same as the suite name reported by Telemetry for several suites.

Bug: 998329
Change-Id: Ie9119dbf24353de7487cb1601db8234fd8efcd90
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2590365
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836887}