Re: [ServiceWorker] consider allowing multiple worker thread instances for a single registration (#756)

To be clear, I'm only suggesting we state the browser may spin up multiple SW instances, but not make it a major feature.  We would still spec explicit solutions for heavy CPU tasks, etc.

I just question if maintaining one-and-only-one instance is worth the code complexity and perf hit in a multi-process browser architecture.

Can chrome produce multiple service worker instances for different content processes today?  Or do you already have a solution to guarantee a single SW instance across the entire browser?

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