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During browser startup, registering a service worker can be slow (in
order of a few seconds). We currently register SW based extension's
script on every extension activation (when we load extensions),
which isn't necessary as SW registrations are suppose to persist
across browser restart by design.

Add a pref to remember the fact that we have successfully registered
an extension's background SW script for a particular version of
that extension and use that to decide whether or not to register
the SW during OnActivateExtension.

This CL will improve SW based extension's startup time.

Bug: 889687
Test: Demo browser clock extension doesn't lag much with the change (note that this is requires local modification to chromium, specifically Patchset #2)
Change-Id: Icfb7174be27f65a1cb6b8ac6d99ddc6b33fdf1c0
Reviewed-on: https://chromium-review.googlesource.com/c/1265821
Commit-Queue: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604823}