Earlier quoted context omitted.
As a Google Engineer, I can assure you that nobody who interviews you will give a damn about your code in github. Unless you're James Gosling or someone at that level. (But then again I don't think they interviewed James Gosling in the same way they interviewed me, so the point is moot.) Google interviewers are interested in how well you can code (or design a solution) in a whiteboard for 45 minutes. I'm not claiming…
(Non snark ahead) Could this be why working at Google is no longer the prize it once was? And why developers would rather go to Facebook, Twitter, Dropbox, et al?
(Non snarky response) I dunno. I joined Google in 2008, and as far as I know Google was always like that. So, unless you claim developers have preferred Facebook etc. to Google for more than 5 years now, it's probably not related to the interview process.