NetS13nServiceWorker: Add virtual tests for ServiceWorkerServicification

Bug: 828331
Change-Id: I6198fe5be6de71a33fc3bc191d16802c92b2751f
Reviewed-on: https://chromium-review.googlesource.com/1025593
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561774}
6 files changed