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This adds COEP reporter for service worker contexts. CORP failures
happening on subresource requests initiated from a service worker are
reported to the COEP reporter owned by EmbeddedWorkerInstance.

Bug: 1056122
Change-Id: I7884487e0261b4d85bf98b5844c3e34c0b985ebe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2098166
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749584}