Re: [webcomponents] [Shadow]: Add "closed" flag to createShadowRoot (bugzilla: 20144) (#100)

Given `visible` and `hidden` are values of `visibility` CSS property and `hidden` is also a content attribute that hides an element, I think it would be too confusing to reuse for this purpose.

I think it's fine to leave `open` and `closed` for now.  If we can come up with a better name, we can change it later.

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