Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
Just released code for a push button that should adhere to the the Google sign-in branding guidelines under LGPL.
See: https://github.com/hdijkema/qgooglesigninbutton