FEDX-118 Adding header to test page

lms/static/js/header_factory.js

@@ -0,0 +1,16 @@
+;(function (define) {
+    'use strict';
+
+    define([
+        'edx-ui-toolkit/js/dropdown-menu/dropdown-menu-view'
+    ],
+    function (DropdownMenuView) {
+        return function() {
+            var dropdownMenuView = new DropdownMenuView({
+                el: '.js-header-user-menu'
+            }).postRender();
+
+            return dropdownMenuView;
+        };
+    });
+}).call(this, define || RequireJS.define);