Would it be possible to ask how to do that exactly in more detail if you know how? That sounds like something that would be really useful to be able to do before the feature is fully implemented.
Use transform/warp for each layer, basically. Here's a quickly done example:
Whoa, neat! Which tool does that? That's really well done.
No special tool is used, just free transform and other transform variants (perspective/distort/skew/etc). This is done manually.