Re: [w3c/webcomponents] Provide a lightweight mechanism to add styles to a custom element (#468)

I don't think it makes sense for `customElements.define` to take a promise. That would result in a flush-of-contents between the time custom elements are upgraded / constructed and when the stylesheet is loaded. Also, that means the custom element would likely need to handle the state in which a custom element is styleless. It's a lot cleaner & avoids flush-of-contents if the script had waited until the stylesheet is loaded to define a custom element instead.

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