Having interviewed for both Google and Facebook I think this really does come down to skills (knowledge and ability). Being a white male didn't do shit for the fact that I simply just didn't understand linux file systems, networking and software development as well as I thought I did. In fact I didn't get a single question as to my age, race, or sexual preference during those first phone calls where I was ripped to shreds with technical questions. It was quite apparent after 5 minutes of the 2nd interview that I wasn't going to get the job, and I had a LOT to work on in my chosen field.
These are not racially bias questions where you need to be white, unless netmask questions and being asked to write a program are racially bias.
Then again, it is google, they probably know more about me then I know about myself. The interview was probably just to gather metadata to advertise to me better.