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This is part of a patch series where we leverage the recently introduced
layer that allows integrating legacy SyncableService implementations
within the newest architecture, USS. This requires forking custom
controllers because a different class hierarchy is used.

Bug: 870624
Change-Id: I0931243109eef8f757692c5a932f03004f8ce039
Reviewed-on: https://chromium-review.googlesource.com/1254211
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595771}