http://lifehacker.com/how-to-run-and...-op-1637564101
http://www.pcmag.com/article2/0,2817,2469232,00.asp
Yeah, technically, you can just *convert* an app into a chrome-extension.crx (and use the community imitation of App Runtime for Chrome) but in practice, that doesn't always work so well...
And you need unsupported tools to do it in Chrome, since the official method is ChromeOS only.
FWIW, it is my understanding that an app will (often) have to be designed in a way that is forgiving of the ARC porting, but if you can contribute that design to the FBReader source code (and I really have no idea what that entails, or even whether non-Google developers get to know, yet) then it shouldn't be a problem to repackage it.
The main problem is, this is still in the Land of Hack.