Though these products/ projects are certainly doing very well and look promising, I'll call them "massive successes" when they start to make significant contributions to Google's profit or even at least revenue.
It's not always about profit and revenue. By your definition, Apache and Linux could not be considered successes.
Personally, I think gaining 10-15% of the browser/smartphone market in a couple years is pretty good. And while the direct success of Chrome has been nice, it's also been a kick in the pants for the entire browser industry, which has responded with better, safer, and faster browsers for everyone.
