Re: [WICG/webcomponents] [scoped-registries] Finding a definition for disconnected elements (Issue #1040)

Also, we have to deal with cases where elements from different scoped custom element registries coexist:
```
class OtherElement1 extends HTMLElement { };
customElements.define('other-element', OtherElement1);

const registry1 = new CustomElementRegistry;
class SomeElement extends HTMLElement { };
registry1.define('some-element', SomeElement);
class OtherElement2 extends HTMLElement { };
registry1.define('other-element', OtherElement2);

const registry2 = new CustomElementRegistry;
class OtherElement3 extends HTMLElement { };
registry2.define('other-element', OtherElement3);

const shadowRoot1 = createConnectedShadowTree(registry1);
const shadowRoot2 = createConnectedShadowTree(registry2);
const element1 = shadowRoot1.createElement('some-element');
const element2 = shadowRoot2.createElement('other-element');
element1.appendChild(element2);
element2.innerHTML = '<other-element></other-element>';
element2.querySelector('other-element'); // Is this OtherElement2 or OtherElement3?
```


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