Re: [whatwg/dom] Allow custom "get the parent" algorithms for EventTargets (#583)

@LeaVerou the way custom elements handle this is very specific though to avoid crossing the C++/JS bridge too many times. Having to run a lot of script while building up an event's path isn't acceptable.

It does seem like there are a number of use cases where you want to be able to manipulate the parent post-construction. That argues for some kind of revealing constructor pattern or something similar to `ElementInternals`, e.g.,
```webidl
[Exposed=*]
interface EventTargetInternals {
  attribute EventTarget parent;
};

callback EventTargetCallback = undefined (EventTargetInternals internals);

partial interface EventTarget {
  constructor(optional EventTargetCallback cb);
};
```

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