Add gerrit config lines to cq.cfg

Needed for the CQ to see Gerrit. Eg:
https://cs.chromium.org/chromium/tools/depot_tools/infra/config/cq.cfg?q=cq.cfg&sq=package:chromium&dr=C&l=9

BUG=skia:5627
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2251643005

Review-Url: https://codereview.chromium.org/2251643005
1 file changed