GitLab

Adds a method which will get newly discovered Media Feeds which
will then be displayed to the user. When the user gives their
consent then this will be stored.

Change-Id: I70cc391e394d7c21334c3722526a33e30cf9c45e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2568290Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834430}