Re: [webcomponents] Changes to Dispatching Events (#274)

Yeah, I don't think `scroll` is well defined at the moment :-( I'm saying that we should not have default values based on the event type. It's fine to have a list of event types for monkey patching, but we shouldn't implement it that way and it shouldn't be the end goal for specifying things.

E.g. if `<img>` starts dispatching a new event `tralala` we wouldn't want to update shadow DOM (and perhaps create issues for some other element that doesn't want a scoped `tralala` event). `<img>` should just say it's a scoped event.

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