Re: [heycam/webidl] Specify open dictionaries. (#180)

Yes, the custom property support is a recent addition to the keyframe processing algorithm so it's now open-ended (although we only read properties that meet certain criteria—being recognized animatable properties of having a name that matches custom property syntax, so I guess that makes it not quite open-ended).

For the specific enumeration strategy, I mailed public-script-coord and [was told to use [[Enumerate]]](https://lists.w3.org/Archives/Public/public-script-coord/2014AprJun/0037.html). Then when I went to make the changes I received feedback from @bzbarsky and @heycam that I should probably just use `[[EnumerableOwnNames]]` (see discussion starting https://github.com/w3c/web-animations/issues/107#issuecomment-148103916).

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