Re: [w3c/webcomponents] Shadow tree encapsulation and Element Timing (#816)

Ok, maybe we should split this into two questions:

1. How to allow shadow roots / custom elements to monitor the performance of their shadow elements. This could be solved with @annevk's idea to use `ElementInternals`, although it's not clear to me where these entries would be dispatched (PerformanceObserver? That would be confusing as it is currently window-scoped).

2. How to expose 'implicit registration' (heuristic-based entries about important content, for example the largest content) to the website by default. This could be solved with @domenic's idea to use the shadow host as the culprit.

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