Added region-based filtering for the GUI to make sure only the relevant
events get sent to the session.

Change-Id: I649eb1b33fdf9ed4b82e29d7ba7eb3cfac5eadbb
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/topo/model/UiModelListener.java b/web/gui/src/main/java/org/onosproject/ui/impl/topo/model/UiModelListener.java
index bdbc70a..1342414 100644
--- a/web/gui/src/main/java/org/onosproject/ui/impl/topo/model/UiModelListener.java
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/topo/model/UiModelListener.java
@@ -17,6 +17,7 @@
 package org.onosproject.ui.impl.topo.model;
 
 import org.onosproject.event.EventListener;
+import org.onosproject.ui.model.topo.UiModelEvent;
 
 /**
  * Can receive {@link UiModelEvent}s.