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

Bug: 1041093
Change-Id: I4480eff07b9735d7b0b2132caaed75a7e78311d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015565
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737440}