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This adorns content::ServiceWorkerVersion, blink::ServiceWorkerThread
and blink::ServiceWorkerGlobalScope with a ServiceWorkerToken. The token
is generated in the browser process and communicated to the renderer as
the worker is started.

BUG=1085129, 1096617

Change-Id: I24972cf9be48dd0208042abaa3607807e0f6afed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2330450Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Commit-Queue: Chris Hamilton <chrisha@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795636}