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This is a reland of dec0aa0b

The fix for the failure is in this CL:
https://chromium-review.googlesource.com/c/chromium/src/+/2036479

Original change's description:
> [PM] Add support for dedicated workers
>
> The WorkerWatcher observes dedicated workers through the
> DedicatedWorkerService interface.
>
> Change-Id: If62d911e500def7ebb905311485a8d89eeaca8df
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992208
> Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
> Commit-Queue: Patrick Monette <pmonette@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#736411}

Change-Id: I40b86ea7de8fa4b252ffe805ec5992020dffc515
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2028214
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738160}