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It's a Lollipop thing.

This feature existed 9 months ago, it worked on my Nexus 5.

Yeah, the Chromecast app[1] will let you cast whatever's on your screen, regardless of individual app support. I used it recently, for example, to play the turn-based game UniWar on the TV in my living room.

That app works with Android TV devices, too, although there's an issue there that trips some people up. When it first launches, it will look for Chromecast devices specifically but will not pick up Android TV ones. Even so, if you thereafter select the "Cast Screen" option, your Android TV devices should show up, as my Nexus Player does.

1: https://play.google.com/store/apps/details?id=com.google.and...