Re: [w3c/webcomponents] Need a callback for when children changed or parser finished parsing children (#809)

I support adding a children changed callback as that is indeed a primitive the DOM Standard provides and specifications and implementations use. (Firefox also has internal synchronous mutation observers, but nothing in the platform relies on them, though Firefox does currently use them for the `output` element.)

Before we add this however I'd like https://github.com/whatwg/dom/pull/732#pullrequestreview-215166470 solved. In particular, the primitive I referenced above isn't defined that well and some refactoring is needed. It'd be good to settle on the exact shape in private first before exposing it publicly.

(Note that this is effectively #550 btw.)

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