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Adds a script to find cases where the tags known to the tests and the
tags generated when tests are run on the bots are different. This is
a necessary tool for making the generation of unknown tags fatal in the
future, as we need to know what tags we need to ignore or otherwise
address before turning on that functionality.

Also updates a couple of ignored tags that were pointed out by the
script.

Bug: 1011107
Change-Id: I9022fc779de718b53ea3469d6048dd0fcd7b8c73
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2628043
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843318}