Require internal recipe tryjob

infra/config/cq.cfg

 # See http://luci-config.appspot.com/schemas/projects/refs:cq.cfg for the
 # documentation of this file format.
 
 version: 1
 cq_name: "recipe_engine"
 git_repo_url: "https://github.com/luci/recipes-py.git"
 cq_status_url: "https://chromium-cq-status.appspot.com"
 rietveld {
   url: "https://codereview.chromium.org"
 }
 verifiers {
   reviewer_lgtm {
      committer_list: "project-infra-committers"
   }
   try_job {
     buckets {
       name: "master.tryserver.infra"
       builders { name: "Recipes-py Presubmit" }
       builders {
         name: "Recipes-py Presubmit (Swarming)"
         experiment_percentage: 100
       }
       builders { name: "Recipe Roll Downstream Tester" }
       builders {
         name: "Recipe Roll Downstream Tester (Swarming)"
         experiment_percentage: 100
       }
     }
+    buckets {
+      name: "master.internal.infra.try"
+      builders { name: "build-internal-recipe-downstream-tryjob" }
+    }
   }
 }