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This CL stores the document's Referrer Policy inside the Policy
Container and uses it for inheritance in case of local scheme
URLs. The behaviour is hidden behind a feature flag, disabled by
default.

Change-Id: I5397f55afad0634f485cb5f79134db48b094b3a3
Bug: 1130587, 1075738
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424345
Commit-Queue: Antonio Sartori <antoniosartori@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Dominic Farolino <dom@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822715}