GitLab

This will allow the WorkerTaskProvider to do accurate bookkeeping on
running dedicated workers, even though it dynamically subscribe and
unsubscribe to the DedicatedWorkerService while some workers are already
running.

Bug: 1041093
Change-Id: I96e75274d938324fe178a0999ff7968b030b8827
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2018143
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737245}