91% of their business is advertising, 9% is other stuff including android apps, chromecast, chromebooks, fiber, app engine. The actual number is 4.927 billion for 2013[1].
They have not really had a successful product outside of advertising. Chromecast is probably the closest thing to a success out of all the other things they do. Seeing as how they don't have a single business line over a billion, I'd consider all of them hobbies at this point for a company the size of google.
Apple TV is a > 1 billion product now, and it is absolutely a hobby for Apple. Yet they have 4 different product lines that are huge businesses. Microsoft has a lot of huge business lines. Google has advertising and a bunch of hobbies. Hopefully at some point they turn into something. I'm specifically rooting for Fiber. But that doesn't mean it's true right now. It's just not.