Run mac-dawn-rel on the CQ

TBR=kainino@chromium.org
TBR=senorblanco@chromium.org
BUG=chromium:901830

Change-Id: I28fd4b5d4c2326035a6d3538b9f9eeda9efecdcf
Reviewed-on: https://dawn-review.googlesource.com/c/2620
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
diff --git a/infra/config/branch/cq.cfg b/infra/config/branch/cq.cfg
index 5c1f49c..be34a80 100644
--- a/infra/config/branch/cq.cfg
+++ b/infra/config/branch/cq.cfg
@@ -26,6 +26,7 @@
     }
     buckets {
       name: "luci.chromium.try"
+      builders { name: "mac-dawn-rel" }
       builders { name: "win-dawn-rel" }
     }
   }