Update window.js to support iframes

lib/services/window.js

@@ -14,12 +14,36 @@ windowService._setMessageSource(domEmitterSource);
 
 module.exports = windowService;
 
-
 _.extend(windowService, {
-    isTop: windowService_isTop
+    isTop: windowService_isTop,
+    getTop: windowService_getTop
 });
 
+/**
+ * Gets the top window containing a milo instance.
+ * It is not possible to use `window.top` if the application is contained
+ * in an iframe being served from a different domain (Trying to access
+ * properties of the top window in this case would breach the browser's 
+ * cross-origin iframe policy)
+ */
+function windowService_getTop() {
+  var topWindow = window;
+
+  while (true) {
+    try {
+      var parentWindow = topWindow.parent;
+      // Trying to access this property outside of the same domain will throw an error
+      var milo = parentWindow.milo;
+      if (!milo) return topWindow; // No more milo
+
+      topWindow = parentWindow;
+    } catch (_e) {
+      return topWindow;
+    }
+  }
+}
 
 function windowService_isTop() {
-    return window.top == window.self || window.__karma__;
+    const topMiloWindow = windowService_getTop();
+    return topMiloWindow == window.self || window.__karma__;
 }

package.json

@@ -41,7 +41,7 @@
     "brfs": "^1.4.3",
     "browserify": "^14.0.0",
     "eslintify": "^3.1.0",
-    "grunt": "^1.0.1",
+    "grunt": "1.0.1",
     "grunt-browserify": "^5.0.0",
     "grunt-contrib-copy": "^1.0.0",
     "grunt-contrib-uglify": "^2.0.0",