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

Following up on https://github.com/w3c/webcomponents/issues/816, there is a design problem with shadow DOM that needs to be resolved. There seems to be no way to measure performance within shadow DOM, even if the author of the shadow tree wants to opt in. There are many instances where this seems desirable, for instance when web components encapsulate a web app. Since encapsulating the whole web app in a component seems to be fairly common practice, it would be great to arrive to some consensus on how to allow exposing performance of shadow DOM.

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