Re: [WICG/webcomponents] "open-stylable" Shadow Roots (#909)

Could a key be added to `ShadowRootInit` that would cause the `shadowRoot.styleSheets` or `shadowRoot.adoptedStyleSheets` to mirror the contents of `document.styleSheets`?

```javascript
this.attachShadow({
  mode: 'open',
  adoptDocumentStyles: true
});
```

I would imagine, then, that any local styles (say via a `<style>` block would append to the end of the `StyleSheetList`, but keeping those lists in sync could be gnarly from an implementation perspective.


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