Enable additional OAuth2 scopes for Google

I'm attempting to integrate Evolution with the libaccounts-glib / libsignon-glib framework. I'm hoping to initially support Google and maybe Yahoo! accounts. For Google accounts, I'm using OAuth 2.0 and relying on Ubuntu's Google application key.

I need to some additional OAuth scopes enabled for Evolution to work:

https://mail.google.com/
https://www.google.com/m8/feeds/
https://www.googleapis.com/auth/calendar

Also, I think this one's enabled already, but please double-check:

https://www.googleapis.com/auth/userinfo.email