CQ config: add gerrit CQAbility verifier.

Goal is to ensure that unreviewed and untrusted code isn't sent through
CQ to try bots, by accident or through malicious intent.

R=rmistry@google.com
BUG=chromium:692613
NOTRY=True

Change-Id: I750be91895f5b77229b8f4a22216f00eaa75f7a0
Reviewed-on: https://skia-review.googlesource.com/8620
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Ravi Mistry <rmistry@google.com>
1 file changed