Re: [webcomponents] Change registries to be per document and never shared between documents (#369)

Yeah, I was saying in https://github.com/w3c/webcomponents/issues/369#issuecomment-191754665 that I was not ok with (4). It should either be unambiguous or required.

It sounds like we should go with (1). The remaining questions to me are:

- What should `otherDoc.defineElement` do? Always throw, or operate on a shared registry with its "creator document"?
- What should `otherDoc.createElement("custom-element")` and the parser in that other doc do? HTMLUnknownElement, or use a shared registry?

The current spec shares the registry. If we want to continue with that, maybe we should move the registry to window instead of document... `document.defineElement` is looking like a stranger and stranger API, as opposed to `window.defineElement`.

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