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The default sort order of the All Sites page is by the amount of site engagement
each site has. Retrieve the site engagement score for each origin in All Sites
and sort the list by the max site engagement per domain (eTLD+1) group.

Bug: 835712
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I421c41f3307a4e5b3ea35683bc4455dfc69ecd96
Reviewed-on: https://chromium-review.googlesource.com/1141667
Commit-Queue: Patti <patricialor@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579302}