How can i get a user's gmail contact groups using gmail oauth? (not Contacts API)

Is there a way i can get access to a user's contact groups using the Gmail oAuth alone? I k开发者_JS百科now it is possible to do using the google contacts API, but i am already using the gmail oAuth so i dont want the user to have to authenticate contacts api separately.

hmmm now i;m thinking that you could just oauth into both contacts and gmail of them somehow specifying a double scope parameter... or just writing the program to do one after another.