Re: [webcomponents] Need "slotting changed" event (#288)

@esprehn : I'm fine with using mutation observer if you guys agree that the records are inserted synchronously when nodes are inserted/removed from DOM. @hayatoito didn't want to implement something like that, and wanted a single entry per slot assignment/distribution change per micro-task to avoid style-recalc(?) in Blink, and that's way too weird for mutation observers because the whole point of mutation records is that it gives you records of what had happened.

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