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This CL adds a test that sends an extension event early in the
extension lifetime, specifically after EventRouter sees a listener
registration, shortly after Service Worker is being registered.
This demonstrates that event dispatch works correctly before SW
registration contains an active worker. The registration would contain
installing_worker() in scenario.

This is a regression test for change
0c08a348

Bug: 850792
Change-Id: Ifab379cf60a105c806280fc5c27972f919632eac
Reviewed-on: https://chromium-review.googlesource.com/1091705
Commit-Queue: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569087}