GitLab

Mark a Media Feed and its contents as being displayed
when it is shown in the UI. This will shuffle the
feeds to show new content.

BUG=1053599

Change-Id: Ibf48d01e10a010e07177a54ea2f0b3400b68867f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2309800Reviewed-by: Tommy Steimel <steimel@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790460}