Add PRESUBMIT check to ensure these config files stay correct.

Bug: 973721
Change-Id: Ife5884d39ca22c55fdc58b65220ed0c34c85fb6a
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1743048
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>