Run CI PCG mode on pre-push (aka CQ).
Run CI PCG mode on pre-push (aka CQ).

R=dnj@chromium.org, estaab@chromium.org, vadimsh@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1439643004

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go