GUI2 Topo Added base common base for Topo2ViewMessageHandler and TopologyViewMessageHandlerBase

Change-Id: I6818b764a3dbafb134786c4f6cdddd051b0c88ba
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/TopologyViewMessageHandler.java b/web/gui/src/main/java/org/onosproject/ui/impl/TopologyViewMessageHandler.java
index 5f30bf8..455b0f3 100644
--- a/web/gui/src/main/java/org/onosproject/ui/impl/TopologyViewMessageHandler.java
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/TopologyViewMessageHandler.java
@@ -743,7 +743,8 @@
     //=======================================================================
 
     // Converts highlights to JSON format and sends the message to the client
-    void sendHighlights(Highlights highlights) {
+    @Override
+    public void sendHighlights(Highlights highlights) {
         sendMessage(highlightsMessage(highlights));
     }