[slightlyoff/ServiceWorker] spec exactly how to order non-window Client objects (#887)

The `Clients.matchAll()` spec requires windows to be ordered so that most recently focused windows come first.  This should also specify how to order non-window Clients.

This could probably as simple as:

* Non-window Client objects are considered to never have been focused so always come at the end.
* If there is a tie in focus ordering, order by creation time

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