Re: [w3c/webcomponents] [IDEA] deferred upgrade for Custom Elements. (#559)

@rniwa 

> I think this problem also goes away if we [add back `childrenChangedCallback`](https://github.com/w3c/webcomponents/issues/550).

True, if that callback would be fired when an element is upgraded, at which point we can run an `instanceof` check successfully.

> For now, you can work around it by notifying parent element from a child element's connectedCallback and disconnectedCallback.

But as I mentioned earlier, that (child-to-parent notification/observation) doesn't work with distribution into closed shadow trees, which is why I've changed my API to parent-to-child which should always work, just that I've had to do some hacks like with `setTimeout` above. Even with a closed tree, a parent can look into a `<slot>` and notify children, but it doesn't work the other way around, so I've settled with only parent-to-child notification/observation.

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