Re: [w3c/permissions] Introduce "Automation" section (#151)

> in deference to existing patterns in WebDriver

Ah thanks for explaining. I didn't notice that comment in the doc. Thinking through things a bit more, I do feel that the "reactive" approach isn't entirely sufficient. It would be ok if UAs were mandated to show prompts at particular times, but they aren't always. So, for example, whether or not a prompt will be shown when navigator.requestMIDIAccess is called for the first time is not well defined (intentionally left up to the UA). The test writer would have no way to control this either, because they only have the ability to react to prompts if they are shown. So it feels like we would need a way for test writers to define this initial state in the first place anyway. In spec terms, basically setting a well-defined value for what the current "permission state of a PermissionDescriptor" will return.

I certainly have no expertise with WebDriver though and am happy for those patterns to inform the decision :) But these are just some thoughts.

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