[w3c/permissions] Watching for permission changes (#244)

Get user media, and I suspect other specs, want to be notified of permission changes (independent of the eventing model).

I wonder if we should have some kind of subscription model in our spec for that? 

The Page Visibility spec has something similar, like the "[external now visible visible algorithm](https://w3c.github.io/page-visibility/#dfn-external-now-visible-algorithm)"... I don't know if that's quite ideal, but something like that could work. 

@jyasskin, wdyt? 

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