Re: [ServiceWorker] Changing ServiceWorkerClient.hidden to visibilityState (#498)

Thanks @jungkees ! If it's not too much to ask, we would love to get a rough idea of the plan (in a comment on this issue) so we can get started on the implementation and do some minor adjustments as the spec is updated.

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https://github.com/slightlyoff/ServiceWorker/issues/498#issuecomment-64841128