GUI -- Base Link View added -- WIP.

Change-Id: Iad0bb3d4a796b420d0fcb071812d320c35941b6b
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/UiExtensionManager.java b/web/gui/src/main/java/org/onosproject/ui/impl/UiExtensionManager.java
index 080f5e3..229ace2 100644
--- a/web/gui/src/main/java/org/onosproject/ui/impl/UiExtensionManager.java
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/UiExtensionManager.java
@@ -62,6 +62,7 @@
                                     new UiView("app", "Applications"),
                                     new UiView("intent", "Intents"),
                                     new UiView("cluster", "Cluster Nodes"),
+                                    new UiView("link", "Links"),
                                     new UiView("sample", "Sample"));
         UiMessageHandlerFactory messageHandlerFactory =
                 () -> ImmutableList.of(
@@ -70,7 +71,8 @@
                         new HostViewMessageHandler(),
                         new ApplicationViewMessageHandler(),
                         new IntentViewMessageHandler(),
-                        new ClusterViewMessageHandler()
+                        new ClusterViewMessageHandler(),
+                        new LinkViewMessageHandler()
                 );
         return new UiExtension(coreViews, messageHandlerFactory, "core",
                                UiExtensionManager.class.getClassLoader());