GitLab

By adding a new browser test, this CL clarifies the current behavior
that clients in the prerendering state are exposed via
Clients#matchAll() on service workers. This behavior can be changed
based on future discussions.

Change-Id: I6be9d2e3db91a5b411a5debbe4098a83597f4f86
Bug: 1166470
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626861Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844487}