content: They refer to it in the article as "still-unfinished", so I don't think it's in production.  It's interesting to see Google backing it on mobile and Valve backing it on desktop, because that could really give the project a boost as an open standard.  It's a savvy move on Google's part because it could make it much easier to develop for both PC and Android together, which of course works in Valve's benefit as well.