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

> I think this needs to be a custom element reaction callback.

That's probably limiting. I feel that this is in the same boat as the connect/disconnect reaction that we were asking for last week during the F2F, something a lot more generic.

Now, if we were to add a new reaction callback, will that callback be invoked even when the CE is not connected to the DOM? e.g.:

```js
const ce = document.createElement('x-foo');
ce.appendChild(document.createElement('p'));
```

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