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This CL adds testing for Service Worked-based extensions through
parameterized test fixtures.

Bug: 1093066
Change-Id: Ie94d9eaa00a15e3a48be91505e02b04796055b63
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2238947
Commit-Queue: David Bertoni <dbertoni@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#776871}