You may have seen some blogposts yesterday about someone "hacking" the chromecast to run a gameboy emulator. Well, it is true that I got a gameboy emulator running on the chromecast, but it wasn't really a hack. This application uses no workaround or hack to get this up and running. It only uses the official SDK provided by Google.
I've posted the code on github here: https://github.com/acordar/chromecast-gb
Performance is decent, not exactly the best since it doesn't run at 60fps (might depend on the rom, I've only tested 2). There isn't really any input lag though which is awesome.
If you've whitelisted your chromecast, you can set up the emulator yourself and try it out.