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This CL adds WPT tests for referrer policy applied to
module worker top-level script fetch.

The only manual changes are
- referrer-policy/generic/common.js
- referrer-policy/generic/referrer-policy-test-case.js
- referrer-policy/spec.src.json
and all other modifications are made by
referrer-policy/generic/tools/generate.py.

Bug: 880027
Change-Id: Ib1f9136161e8efacf317fb9b7e9ba0651a103c41
Reviewed-on: https://chromium-review.googlesource.com/c/1330906Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609589}