Re: [w3c/webcomponents] Expose shadowRoot on element internals (#871)

@rniwa , just to double-check your proposal:

```javascript
#shadowRoot = this.attachShadow({mode: 'closed', returnExistingDeclarativeShadowRoot: true});
```

will return the existing declarative shadow root, *with contents included*.

```javascript
#shadowRoot = this.attachShadow({mode: 'closed'});
```

will instead blow away the existing contents of the shadow root and return an empty root. In both cases, no exception will be thrown if a *declarative* shadow root already exists. However, if there is already an imperatively-created shadow root, these will both throw, as they do today.

Is that right? If so, I think I'm ok with that proposal also.

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