Add gerrit_cq_ability verifier.

TBR=sergiyb@chromium.org
BUG=692613
NOTRY=True

Change-Id: I84b044cb00363ba9892bf5902fcedfffdb80d229
diff --git a/infra/config/cq.cfg b/infra/config/cq.cfg
index b17ff8c..19843c2 100644
--- a/infra/config/cq.cfg
+++ b/infra/config/cq.cfg
@@ -20,4 +20,8 @@
       builders { name: "ubuntu14.04-x86-64" }
     }
   }
+  gerrit_cq_ability {
+    committer_list: "project-infra-committers"
+    dry_run_access_list: "project-infra-tryjob-access"
+  }
 }