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This patchset contains two changes to the referrer policy browsertests:

1. Refactor the "reduced referrer granularity flag" tests to use
a parameterized test---this will allow easy expansion to test additional
capping logic, e.g. the "no referrers at all" flag, which is currently
missing test coverage. (This will be remedied by a follow-on CL.)
2. Add tests for subresource requests (by registering a test
server callback to inspect the `Referer` headers sent along with
the requests).

R=jochen

Bug: 1004486
Change-Id: I9bc13fe536f04829e69ba0443c6d724ffb113750
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1842005
Commit-Queue: David Van Cleve <davidvc@chromium.org>
Reviewed-by: Dominic Farolino <dom@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703444}