Re: [w3c/webcomponents] Scoped Custom Element Registries (#716)

```js

const registry = new CustomElementRegistry;

const d1 = document.createElement('div');
d1.attachShadow({mode: 'closed', registry}).innerHTML = '<some-element id="d1s1"></some-element><some-element id="d1s2">';

const d2 = document.createElement('div');
d2.attachShadow({mode: 'closed', registry}).innerHTML = '<some-element id="d2s1">';
const d3 = document.createElement('div');
d3.attachShadow({mode: 'closed', registry}).innerHTML = '<some-element id="d3s1">';

const iframe = document.createElement('iframe');
document.body.append(d2, d1, iframe);
iframe.contentDocument.body.append(d3);

class SomeElement extends HTMLElement {
    constructor() {
        super();
        this.attachShadow({mode: 'closed'}).innerHTML = '<other-element></other-element>';
    }
}
registry.define('some-element', SomeElement);

customElements.define('other-element', class OtherElement extends HTMLElement { });

```

Now, should d1s1, d1s2, d2s1, and d3s1 be upgraded? If so, in what order? Should other-element in d1s1, d1s2, d2s1, and d3s1's shadow trees be upgraded if so, in what order?

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