Add builder for recipe roll tryjob.

masters/master.tryserver.infra/builders.pyl

Index: masters/master.tryserver.infra/builders.pyl
diff --git a/masters/master.tryserver.infra/builders.pyl b/masters/master.tryserver.infra/builders.pyl
index 276b2d95b84b4988e21b03ef175407130dfc0c7a..7b8156f7c07587f662370ea2b22c417b1518d1e8 100644
--- a/masters/master.tryserver.infra/builders.pyl
+++ b/masters/master.tryserver.infra/builders.pyl
@@ -218,6 +218,18 @@
       "slavebuilddir": "presubmit_recipespy",
     },
 
+    "Recipe Roll Downstream Tester": {
+      "category": "Recipe Roll Tryjob",
+      "recipe": "infra/recipe_roll_tryjob",
+      "properties": {

[martiniss, 2016/03/12 18:33:47]

What are these properties supposed to do? They don't exist in the recipe
currently...

[estaab, 2016/03/12 18:39:54]

Sorry, bad copy paste.

+        "repo_name": "build",
+        "runhooks": True,
+      },
+      "scheduler": None,
+      "slave_pools": ["trusty64_slave_pool"],
+      "slavebuilddir": "recipe_roll_tryjob",
+    },
+
     "gerrit-test-cq-normal": {
       "category": "Gerrit CQ",
       "recipe": "infra/gerrit_cq_test",