Re: [webcomponents] Composition Algorithm shouldn't unwrap slots (#308)

I just remembered one other thing about unwrapping/flattening nodes. In Shadow DOM v0, we had this nice property that the [tree-structural pseudo-classes](https://drafts.csswg.org/selectors-4/#structural-pseudos) operated on the composed tree (example here:https://gist.github.com/dglazkov/e8402f9ab18ad7ef2e7d). I guess the real question is how `display:contents` interacts with tree-structural pseudo-classes?

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