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Currently Cross-Origin-Embedder-Policy header is parsed in
ServiceWorkerNewScriptLoader when launching a new service worker.
However, the COEP in the response header for the main script isn't
applied for the network loader created on launching a service worker
because the network loader is created before starting to load the main
script.
This CL is to pause the service worker's script evaluation until the
main script is loaded. Once the main script loaded, new subresource
loaders are created by using the COEP value, and they are sent to the
service worker.
Imported scripts also need to refer to the new value, but the loaders
are in different place (ServiceWorkerScriptLoaderFactory), so it'll be
addressed in a later patch.

Bug: 1039613
Change-Id: Ice82eef86beec2f2f5c5e91f3aa136229f14c3ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2029403
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Auto-Submit: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748112}