[whatwg/dom] CustomElementRegistry and adoption (Issue #1390)

annevk created an issue (whatwg/dom#1390)

### What is the issue with the DOM Standard?

As part of some work on WebKit @rniwa and I identified a case where we'd like to make a node's custom element registry mutable. We'd like to do this when a node has a CustomElementRegistry whose is global is true and essentially reset it on adoption and cloning into a different document so it gets the global registry of that document, if any, instead.

This would essentially preserve existing behavior and as such I hope it's not controversial. I'm writing some tests and will figure out the specification changes later.

cc @smaug---- @mfreed7 @foolip @AtkinsSJ @keithamus 

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