Re: [csswg-drafts] [css-overflow] overflow: Consider support for overlay scrollbars

Bikeshedding a bit more, I think I like:

```
overflow-gutter: auto | stable | always
```

(and `none` if we end up accepting #419)

All of these values only have effect when `overflow` is `auto`:

* `auto` would give us today's behavior (or, if it turns out we *can* 
change it, act like `stable`)
* `stable` is the "zero space if overlay, always space if intrustive" 
behavior
* `always` is the "always space as if it's intrusive, even if you have
 overlay" behavior

If people don't have objections to these, I'll write them up proper in
 a spec.

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