GitLab

This CL adds a simple version of the find_bad_builds.py script. It finds
builds which may contain a given CL which was landed and then reverted.

Future CLs add more features to this script. See https://crrev.com/c/2464165
for a fuller description.

Bug: 1137072
Change-Id: I3b4469b74d2be69af7655c20082900bbe0b5377f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2469226
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818706}