Add experimental downstream recipe trybots to depot_tools

Bug: 644609
Change-Id: Ie832a443ab9ab2cb8e7a114df67ce665ff6c91f1
Reviewed-on: https://chromium-review.googlesource.com/584877
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Paweł Hajdan Jr. <phajdan.jr@chromium.org>

infra/config/cq.cfg

@@ -25,6 +25,33 @@ verifiers {
     buckets {
       name: "luci.infra.depot_tools.try"
       builders { name: "Depot Tools Presubmit" }
+      builders {
+        name: "build Roll Tester"
+        experiment_percentage: 100
+      }
+      builders {
+        name: "infra Roll Tester"
+        experiment_percentage: 100
+      }
+      builders {
+        name: "skia Roll Tester"
+        experiment_percentage: 100
+      }
+      builders {
+        name: "skiabuildbot Roll Tester"
+        experiment_percentage: 100
+      }
+    }
+    buckets {
+      name: "master.internal.infra.try"
+      builders {
+        name: "build_limited Roll Tester (depot_tools)"
+        experiment_percentage: 100
+      }
+      builders {
+        name: "release_scripts Roll Tester (depot_tools)"
+        experiment_percentage: 100
+      }
     }
   }
 }