facebook/tornado — pull request #858 by sclm (2013-07-17 23:05:41+00:00)
Title: Add in Google OAuth2 support.

Since Google's main authentication in Tornado is the Hybrid approach that uses OAuth 1, I've found at least one service that doesn't allow for OAuth 1 tokens - CardDAV.

To that end, this is a OAuth2 mixin modeled on the FacebookGraphMixin that performs the OAuth2 flow with Google.