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This makes the origin trial functional pending the issuance of tokens.
It includes a test that verifies that the default feature state is
appropriate for this trial, and adjusts those defaults.

Also as a consequence of this, cross-origin portals will now be
disabled by default. They can be re-enabled for development purposes
only via:
  flags: chrome://flags/#enable-portals-cross-origin
or switch:
  --enable-features=PortalsCrossOrigin

Finally, the toggling of these makes our tests a little wonky.
Previously we were forcing the browser-side logic on in response
to experimental web platform features, but some tests rely on
cross-origin portals which probably shouldn't be on for all users
with experimental web platform features. Instead these tests are
moved to a virtual test suite for the time being, consistent with
a number of other unlaunched features.

Bug: 1040212,1093466
Change-Id: I7dd75e0e2053206368d806439eed4b6b918a1a3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2240057
Auto-Submit: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Lucas Gadani <lfg@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782003}