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

Heya, just wanted to chime in that I was building a simple component that only shows 1 of its children at a time using `display:none` on dynamically generated `<slot>`s to avoid problems like in https://jsfiddle.net/tLc2znyh/ . I use manual slot assignment so I had to use a `MutationObserver` to mix `wc.children` and dynamic `slot.assign()` ( https://codepen.io/bradleymeck/pen/poxzXoE?editors=1001 ). Having a simpler way to do this would be great. I would note, in at least me scenario, even with a simplistic callback needing to re-layout due to slots is pretty wasteful and prone to some memory leakage in my tests (see `layout()` in codepen example) where I have to manually cross reference slot elements and their assignments so having better clarity on *WHERE* the node has been moved to would be ideal not just that it was added/removed.

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