TopoRegions: created skeleton Topo2 UI view for development of the "region-aware" topology.
 - Added initial event generation (layout/region/ etc.) -- WIP

Change-Id: I2f93eea7505ff0400085d7f67491f6b61231cb86
diff --git a/core/api/src/main/java/org/onosproject/ui/RequestHandler.java b/core/api/src/main/java/org/onosproject/ui/RequestHandler.java
index a789a74..76710a2 100644
--- a/core/api/src/main/java/org/onosproject/ui/RequestHandler.java
+++ b/core/api/src/main/java/org/onosproject/ui/RequestHandler.java
@@ -89,6 +89,17 @@
 
     /**
      * Sends a message back to the client.
+     *
+     * @param eventType message event type
+     * @param payload   message payload
+     */
+    protected void sendMessage(String eventType, ObjectNode payload) {
+        // TODO: remove sid
+        parent.connection().sendMessage(eventType, 0, payload);
+    }
+
+    /**
+     * Sends a message back to the client.
      * Here, the message is preformatted; the assumption is it has its
      * eventType, sid and payload attributes already filled in.
      *