Add off-main-thread-worker-script-fetch/external/wpt/referrer-policy

Bug: 835717, 880027
Change-Id: I074ea4b911132477853bf95be70a36b7d62c4f79
Reviewed-on: https://chromium-review.googlesource.com/c/1330903
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609534}
3 files changed