Tests for new shadow DOM API

Hi all,

Where should we put tests for new shadow DOM API?  It looks like the tests in https://github.com/w3c/web-platform-tests/tree/master/shadow-dom/shadow-trees <https://github.com/w3c/web-platform-tests/tree/master/shadow-dom/shadow-trees> are mostly obsolete and I'm not certain how many of them could be adopted for the new API.

Would it make sense to rename this old one to "deprecated-shadow-don" and then create a new top-level directory "shadow-dom"?  We can then migrate or write new tests there.

- R. Niwa