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

@domenic 
It has a lot to do with integrating with custom elements. Ostensibly the primary way of constructing a style sheet will be either `new CSSStyleSheet` or whatever the current proposal of `CSSStyleSheet.createFromString` will be. 

To make this feature truly compelling and user friendly, I believe this should either accept a `Promise<CSSStyleSheet>` or maintain a reference to the sheet so it can be modified and shared. 

The CSS working group apparently has a distaste for synchronous parsing, so this feature needs to cooperate with how users will create style sheets. (See this comment from @tabatkins.)[https://github.com/WICG/construct-stylesheets/issues/25#issuecomment-391378735]

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