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This is a followup to https://crrev.com/c/2039190 which added an API
to query the opt-in state.

Actually using any of the new APIs is still left for future CLs.

Bug: 1049141
Change-Id: I3bda91ad80286a070c47465ecbb7ad5677db1126
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2039450
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740284}