[whatwg/dom] Set the stage for preventing double custom element constructor calls (#282)

This is part of https://github.com/w3c/webcomponents/issues/533. It introduces a new custom element state of "failed", which HTML will use on failed upgrades or failed parser-initiated element creation, to ensure that if a constructor fails, the element will not be upgraded in the future (i.e. the constructor will not be called again for that element).
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/282

-- Commit Summary --

  * Set the stage for preventing double custom element constructor calls

-- File Changes --

    M dom.bs (17)
    M dom.html (284)

-- Patch Links --

https://github.com/whatwg/dom/pull/282.patch
https://github.com/whatwg/dom/pull/282.diff

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