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Add functionality to sort the All Sites list, with an initial option to sort by
a site group's eTLD+1 name. Note that sites shown individually (ungrouped) in
All Sites will also be sorted by their eTLD+1.

See a screenshot of this feature at
https://bugs.chromium.org/p/chromium/issues/detail?id=835712#c19

Bug: 835712
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: Ic58e1bf294189b4fefc2cf0f8532725a71f2b36c
Reviewed-on: https://chromium-review.googlesource.com/1128782
Commit-Queue: Patti <patricialor@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575165}