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

We discussed this briefly during the conference call this week. Apparently @tkent-google has suggested two alternatives:
1. Exposing `Performance` on `ShadowRoot`
2. Add a boolean argument to `attachShadow`'s options to specify whether element timing would be exposed or not

I objected to (2) since it breaks the encapsulation of shadow roots.

Another alternative I suggested would be making `PerformanceObserver` and other functions on `Performance` take a list of shadow roots as an argument as we're planning to do for selection (see issue #79).

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