Re: [w3c/webcomponents] Measuring performance of shadow DOM (#848)

I still don't think it's particularly precise. Presumably those with access to the shadow tree have access to the information, if it's exposed on nodes. So they could relay it to others if they so desire.

As for `ElementInternals` and the slightly wider applicability of shadow trees, I think folks are largely coming around to the idea that if we had `ElementInternals` first, shadow trees would only be exposed through that.

Explicit piercing for open shadow trees could work (and could be applied to `MutationObserver` in theory, but I don't think we want to do that), but in general it's better if we design things that work for open and closed trees.

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