Re: [w3c/ServiceWorker] ServiceWorker.postMessage() references the not-yet-created worker global (#1126)

I think we need the global object to get the target realm to invoke `StructuredCloneWithTransfer(message, transfer, targetRealm)`. This serialization should be done on the calling context, right? Or does it make sense to run `StructuredCloneWithTransfer()` in the queued task?

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