Re: [w3c/permissions] Don't assume implicit grant from getUserMedia. (#78)

This is a bit of a more general question (sorry if it's already been discussed!): how much do we want to standardize UA behavior with regard to persisting/retrieving permission decisions? 

The current working draft doesn't talk about persistence at all, but we've effectively been fleshing this out in fine detail in the editor's draft.

I'm a bit torn: at one level I like the idea of having consistent behavior across browsers. OTOH it feels like the question about how persistence should work is closely tied to the UI. Different browsers may have different opinions and different UIs may lend themselves to different strategies for persisting decisions. We don't attempt to standardize UI atm. 

Another example of the difficulty in standardizing this is that in Chrome we provide features which allow system administrators to override stored permission decisions. In order to comply with the spec (for features like this) we would need to insert a clause that allows the UA to override the permission decision returned. 

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