It's not going to happen anytime soon, I believe. Like with us small players, I'm sure it makes much more financial sense for companies like Google to HODL their coins, if they have any, rather than spend it. I would also imagine that having two pay out options rather than just one would complicate their standard operating procedures. Conversion between currencies, Bitcoin included, incurs fees after all. If they start paying with Bitcoin, it's extremely likely they'll abandon the USD option, and will only be paying in Bitcoin. That makes this scenario even further removed from reality.