Build events-gcloud-pubsub master against gerrit-3.4

Change-Id: I7f8c7afca4275cb4ba0a0942dfecb7fbd9e3ba7c
diff --git a/jenkins/gerrit-bazel-plugin-events-gcloud-pubsub.yaml b/jenkins/gerrit-bazel-plugin-events-gcloud-pubsub.yaml
index f38734a..9642903 100644
--- a/jenkins/gerrit-bazel-plugin-events-gcloud-pubsub.yaml
+++ b/jenkins/gerrit-bazel-plugin-events-gcloud-pubsub.yaml
@@ -1,6 +1,11 @@
 - project:
     name: events-gcloud-pubsub
     jobs:
+      - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
+          branch:
+            - master
+          gerrit-branch:
+            - stable-3.4
       - 'plugin-{name}-bazel-{branch}':
           branch:
             - stable-3.3