Add goma to WATCHLIST to monitor cq.cfg

We, goma team, are tracking CQ compile time, so when the set
of CQ builders are updated, we'd like to detect it.

BUG=

Review-Url: https://codereview.chromium.org/2696383002
Cr-Commit-Position: refs/heads/master@{#450915}
1 file changed