Re: [w3c/webcomponents] Add `customElements.upgrade` (#710)

@bkardell @rniwa is there any way you can provide a code sample of shallow vs deep?
In our implementation to "upgrade" is merely prototype swizzling and dispatching `connectedCallback()`. A subset of the entire spec but suits our minimalistic needs.

https://github.com/devpunks/snuggsi/blob/master/custom-element-registry/index.es#L30-L45

Just trying to understand if you mean the following:

```html
<foo-bar>
  <baz-bat>Who is responsible for my upgrade?</baz-bat>
</foo-bar>
```

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