Re: [w3c/ServiceWorker] Expose environment ids? (#643)

It would be nice we could provide an API to snapshot the current window as a full `Client` snapshot object.

What about something like:

```
let selfClient = new Client(window);

let frame = document.createElement(iframe);
document.body.appendChild(frame);

let FrameClient = new Client(frame.contentWindow);
```

Seems if you have synchronous access to a window global we could simply mint the full Client object immediately.

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