cq.cfg: add equivalent builder for LUCI linux_chromium_rel_ng.

Bug: 
No-Try: True
Change-Id: I3e377897c170947dd0259dc3f856b502e19cf9e4
Reviewed-on: https://chromium-review.googlesource.com/539615
Commit-Queue: Erik Staab <estaab@chromium.org>
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#480778}

infra/config/cq.cfg

@@ -32,6 +32,20 @@ verifiers {
 # chrome-eng-review per
 # https://sites.google.com/a/chromium.org/dev/developers/testing/chromium-build-infrastructure/tour-of-the-chromium-buildbot?pli=1#TOC-Adding-new-build-configurations-and-tests-to-the-main-Chromium-waterfall-Commit-Queue
   try_job {
+    buckets {
+      name: "luci.chromium.try"
+      # Builders in this bucket are defined in
+      # https://chromium.googlesource.com/chromium/src/+/infra/config/cr-buildbucket.cfg
+      builders {
+        name: "LUCI linux_chromium_rel_ng"
+        equivalent_to {
+          bucket: "master.tryserver.chromium.linux"
+          builder: "linux_chromium_rel_ng"
+          owner_whitelist_group: "luci-chromium-cq-dogfood"
+          percentage: 100
+        }
+      }
+    }
     buckets {
       name: "master.tryserver.chromium.android"
       builders { name: "android_arm64_dbg_recipe" }