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

> For initial about:blank documents, don't open the client message queue unless startMessages() is called, or there's an assignment to navigator.serviceWorker.onmessage. For non-initial documents, open the client message queue after DOMContentLoaded (as is spec'd now) unless it's already open.

@jakearchibald, would this apply only to `Client.postMessage()` or are you talking about changing `window.postMessage()` for initial about:blank also?

Changing `Client.postMessage()` only seems ok to me I guess.

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