Re: [webidl] Add a [SecureContext] operator attribute (#65)

Oh, and to the main question about whether it's the incumbent script that should be used or not...  In Gecko, it's quite easy to do that, but I recall both Blink and IE having serious concerns about use of incumbent settings objects, because those involve some sort of expensive stack walk in those implementations.  So it really would be good to figure out whether it actually matters in practice which settings object is used.  And that comes back to my question about whether two pages that are same-effectives-script-origin can ever differ in terms of whether they're secure contexts.

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