[Common UI] Initial commonUI bundles

Bring in work on general-purpose and over-arching
user interface bundles from the sandbox transition
branch. WTD-574.

platform/commonUI/browse/src/navigation/NavigationService.js

@@ -0,0 +1,50 @@
+/*global define,Promise*/
+
+/**
+ * Module defining NavigationService. Created by vwoeltje on 11/10/14.
+ */
+define(
+    [],
+    function () {
+        "use strict";
+
+        /**
+         *
+         * @constructor
+         */
+        function NavigationService() {
+            var navigated,
+                callbacks = [];
+
+            function getNavigation() {
+                return navigated;
+            }
+
+            function setNavigation(value) {
+                navigated = value;
+                callbacks.forEach(function (callback) {
+                    callback(value);
+                });
+            }
+
+            function addListener(callback) {
+                callbacks.push(callback);
+            }
+
+            function removeListener(callback) {
+                callbacks = callbacks.filter(function (cb) {
+                    return cb !== callback;
+                });
+            }
+
+            return {
+                getNavigation: getNavigation,
+                setNavigation: setNavigation,
+                addListener: addListener,
+                removeListener: removeListener
+            };
+        }
+
+        return NavigationService;
+    }
+);