Re: [w3c/ServiceWorker] consider Client behavior for windows where initial about:blank is replaced with a loaded document (#1091)

More details from IRC:

As @jungkees said, one of the main use-cases is messaging. The developer should be able to send a message to the resulting page as part of a request of mode navigation.

We handle this with reserved clients by buffering messages until the client is created & the port is started (either explicitly by calling `startMessages()`, implicitly by assigning to `onmessage`, or after `DOMContentLoaded`).

However, this won't work with iframes (or `window.open`) because it has already loaded with `about:blank`, and the new document will load into that global. The port has started way before the document loads.

Even if we make initial & reserved different things, we need to solve this for the initial case.

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