Add an experimental cros-dut-flash-scheduler builder to buildbucket-dev.

This'll be the builder that triggers nightly flashing jobs into the
cros-dut-flash builder.

Adding it to dev while I develop & experiment with it and the flashing
builder.

Bug: 866062
Change-Id: I0319bbcb3591a6488940a9a61330a787d9dbdc01
Reviewed-on: https://chromium-review.googlesource.com/c/1325013Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606255}

infra/config/global/cr-buildbucket-dev.cfg

@@ -96,6 +96,14 @@ buckets {
         name: "cros_flash"
       }
     }
+    builders {
+      # An experimental builder that triggers builds on cros-dut-flash nightly.
+      name: "cros-dut-flash-scheduler"
+      dimensions: "os:Ubuntu-14.04"
+      recipe {
+        name: "cros_flash_scheduler"
+      }
+    }
   }
 }