[ojn]

You're thinking of the previous ARC solution that used NaCl and Arc Welder to convert apks.

In this case, the Android container contents is not opensourced. They might or might not be down the road, it hasn't been decided on yet.

http://arstechnica.com/gadgets/2016/05/the-play-store-comes-... has a bit more info on that.

Same with a few of the pieces in Chrome OS that are needed; not all of them are open at this time but might be down the road.