How Do I Implement User Authentication In A Chrome Extension Using Google App Engine As Backend?

This is a follow up to my previous question. I am working on a Chrome extension http://ting-1.appspot.com/ that saves the bookmarked page to Google App Engine backend. Looking at

Solution 1:

Your extension needs to send the user to your app to sign in, so that the appropriate cookies will be set and your extension can authenticate as the user. The Chrome to Phone extension does this, and you can examine its source to see how.