Re: [ServiceWorker] Clients & postMessage (#609)

@mounirlamouri Anne is suggesting the client objects should be 'live'. We can't put their state properties behind promises, else iterating over them to find which client to focus becomes unmanageable. Having client properties update live sounds like a performance issue to me, or is it not as bad as I think?

We could make the values update lazily, making only rough guarantees about accuracy.

Or we could stick with the snapshots and give clients an `id` for comparison purposes.

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