[w3c/permissions] Automation: "set permission" granularity (#348)

I looked at the spec in the light of WebKit implementation of a preliminary "set permission" automation API for getUserMedia.

In WebKit, getUserMedia prompt is based on the top level origin only as this is the only thing we can expect a user to reason about.
If a third-party context calls getUserMedia, the decision is still made based on the top level origin.

The current WebKit implementation of "set permission" is using a single value for all browsing contexts.
The current spec allows granularity at the context level and it is not clear to me what the use cases for such a granularity are.

I wonder whether a single value per top origin might be granular enough.
For getUserMedia at least, that would align somehow with how persistent permissions work in Safari.

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