Re: [w3c/webcomponents] Expose shadowRoot on element internals (#871)

> Oh right. I was thinking of the synchronous construction case only. We probably need to introduce a new custom element state like "precustomized" and set to it right before step 8.2 ("Let constructResult be the result of constructing C, with no arguments.") of [upgrading an element](https://html.spec.whatwg.org/multipage/custom-elements.html#concept-upgrade-an-element). Then the change I'm suggesting will check whether the custom element state is either `custom` or `precustomzied`.

After re-reading [Upgrade an element](https://html.spec.whatwg.org/multipage/custom-elements.html#concept-upgrade-an-element) a few times, I think the above suggestion sounds like it'll work. If there's general agreement here, I'm happy to put together a spec PR, and modify the Chromium implementation. Any objections? @domenic?

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