Add experimental LUCI linux_chromium_rel_ng buidler

infra/config/cq.cfg

Index: infra/config/cq.cfg
diff --git a/infra/config/cq.cfg b/infra/config/cq.cfg
index 6e1f7d7cb9cca497e5ef3537ee2fa9de960b08b3..0903553598e0a8f75ccaff4fd8b74b5c04466a63 100644
--- a/infra/config/cq.cfg
+++ b/infra/config/cq.cfg
@@ -26,6 +26,13 @@ verifiers {
 # 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.infra.try"
+      builders {
+        name: "LUCI linux_chromium_rel_ng"
+        experiment_percentage: 1
+      }
+    }
+    buckets {
       name: "master.tryserver.chromium.android"
       builders { name: "android_arm64_dbg_recipe" }
       builders { name: "android_clang_dbg_recipe" }