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

Now, I am working on a proof of a concept to support `slotchange` event, a tentative name, in Blink.

I am thinking that `slotchange` event's `scoped` flag must be true in default.
The reason: it does not make much sense that a node in a parent tree receives a `slotchange` event which is dispatched in a slot in a child tree. From the node in the parent tree, the event's target is not a slot element due to event target retargeting.

WDTY?


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