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Previously it doesn't care about the throttles, but it means the update requests
will be missed from the embedder. This CL is to use ThrottlingURLLoader in
ServiceWorkerSingleScriptUpdateChecker, and also this makes
ServiceWorkerNewScriptLoader be able to inherit the throttling loader if it's
resuming a cache writer.

Now throttles work only on the UI thread, so this CL introduces a thin wrapper to
invoke method calls on the UI thread.

After this CL lands, I'm going to add code to send the paused state to the
renderer as a resource override so that the renderer doesn't create
ThrottlingURLLoader for the request which is already using ThrottlingURLLoader
in the browser process.

Bug: 988957
Change-Id: I32e19d3cd7071dddc056ffdab2bfad36679d5b0f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1728889
Auto-Submit: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686419}