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This CL cleans up and submits a script originally written by engedy@chromium.org
with a few speed and convenience improvements:
- use multi-threading to reduce runtime from ~45m to ~8m
- add flags for controlling a few options
- automatically run the config formatter
- reduce the number of false positives
- make the script py2 (since chromium is still on py2)

Bug: 1053702
Change-Id: Ie5d211d0374f5db6352677821e27defa415c7d11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2637405Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Ehsan Kia <ehsankia@google.com>
Cr-Commit-Position: refs/heads/master@{#845695}