GitLab

The WorkerWatcher observes dedicated workers through the
DedicatedWorkerService interface.

Change-Id: If62d911e500def7ebb905311485a8d89eeaca8df
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992208Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736411}