GitLab

Add a basic webui at chrome://media-feeds
for debugging Media Feeds internals.

BUG=1058187

Change-Id: Ia769f103bdd5abfd6ff00754c26117e684d2fb03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2086331
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748778}