Unfortunately, not supported. See Google Contacts read only (OAuth 2.0)
There is some "readonly" scope that doesn't actually work with the v3 API and calling google.com/m8/feeds will fail to get contacts.
My suggestion is to up-vote this issue: https://code.google.com/p/gdata-issues/issues/detail?id=4788 in attempt to get Google to add it. But I wouldn't hold my breath on it happening soon unfortunately.
EDIT: Update! It is now supported by Google in their v3 API: https://developers.google.com/google-apps/contacts/v3/ via 'https://www.googleapis.com/auth/contacts.readonly' instead of 'https://www.google.com/m8/feeds' (RW access)