add a Chrome builder to the CQ

This appears to be the fastest Chrome builder, averaging 8-9 minutes.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2085333002

Review-Url: https://codereview.chromium.org/2085333002

infra/branch-config/cq.cfg

@@ -47,6 +47,11 @@ verifiers {
       name: "client.skia.fyi"
       builders { name: "skia_presubmit-Trybot" }
     }
+    buckets {
+      name: "master.tryserver.chromium.mac"
+      # At time of writing, this is the fastest Chrome compile bot on average.
+      builders { name: "mac_chromium_compile_dbg_ng" }
+    }
     try_job_retry_config {
       try_job_retry_quota: 1
       global_retry_quota: 2