Handle authentication failures in the v2 app by restarting the app

remoting/webapp/base/js/base.js

Index: remoting/webapp/base/js/base.js
diff --git a/remoting/webapp/base/js/base.js b/remoting/webapp/base/js/base.js
index 86c91565bb9f1907eaa792dbafeb4dcb5f0e187f..97fa5360d895ec2ed27c6cc6967b6b43a806c0be 100644
--- a/remoting/webapp/base/js/base.js
+++ b/remoting/webapp/base/js/base.js
@@ -467,4 +467,12 @@ base.jsonParseSafe = function(jsonString) {
   } catch (err) {
     return undefined;
   }
-}
+};
+
+/**
+ * @return {boolean} whether the calling script is executing in the background
+ *   page or not.
+ */
+base.isBackgroundPage = function() {
+  return base.isAppsV2() && !Boolean(chrome.app.window.current());
+};