Re: [w3ctag/design-reviews] JavaScript Memory API (#386)

I updated the API to rely on [COOP+COEP](https://docs.google.com/document/d/1zDlfvfTJ_9e8Jdc8ehuV4zMEu9ySMCiTGMS9y0GU92k/edit) for security.

That greatly simplified the design and implementability of the API. It also resolves @annevk concern about non-deterministic exceptions. Now the API throws if (and only if) `crossOriginIsolated == false`.

That also allowed increasing the scope from a single JS agent to all JS agents of the web page (a big win for usability of the API).

The new version of the API is here: https://github.com/ulan/performance-measure-memory

@cynthia do I need start a new TAG review for the updated version of the API?


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