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/topo/TopoologyTrafficMessageHandlerAbstract.java b/web/gui/src/main/java/org/onosproject/ui/impl/topo/TopoologyTrafficMessageHandlerAbstract.java
new file mode 100644
index 0000000..900f4df
--- /dev/null
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/topo/TopoologyTrafficMessageHandlerAbstract.java
@@ -0,0 +1,26 @@
+/*
+ * Copyright 2019-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.ui.impl.topo;
+
+import org.onosproject.ui.UiMessageHandler;
+import org.onosproject.ui.topo.Highlights;
+
+/**
+ * Base superclass for traffic message handler (both 'classic' and 'topo2' versions).
+ */
+public abstract class TopoologyTrafficMessageHandlerAbstract extends UiMessageHandler {
+    public abstract void sendHighlights(Highlights highlights);
+}