[whatwg/dom] Add delegatesFocus init to attachShadow and flag to ShadowRoot (#768)

The DOM part of https://github.com/whatwg/html/issues/2013

This adds `delegatesFocus` to `ShadowRootInit`, used in `attachShadow`. 
Also adds a "delegates focus flag" on shadow roots, that later can be referenced by the focus algorithms in the HTML specs.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/768

-- Commit Summary --

  * Add delegatesFocus init to attachShadow and flag to ShadowRoot

-- File Changes --

    M dom.bs (7)

-- Patch Links --

https://github.com/whatwg/dom/pull/768.patch
https://github.com/whatwg/dom/pull/768.diff

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