Re: [ServiceWorker] Race when registering multiple service workers for the same scope (#783)

@wanderview @mattto I just updated the spec as discussed: 7b49e85bf2fa1ec36be583abbff018084e78af28. The basic behavior is:
 - It uses a single job queue where register/update/unregister job is scheduled in FIFO order.
 - The same job is aggregated when scheduled.
 - The UA dooms installing worker in favor of the next job in the queue if possible

I intended to write it conforming to the current implementation. Please review it.

/cc @slightlyoff @jakearchibald @annevk 

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https://github.com/slightlyoff/ServiceWorker/issues/783#issuecomment-165696844