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A USS bridge has been recently introduced in
https://chromium-review.googlesource.com/c/chromium/src/+/1164742 to
allow integrating legacy SyncableService sync datatypes into the most
modern USS architecture.

In this patch, a controller is introduced to do the necessary plumbing
and use the new codepath behind feature toggles. We do this for a first
set of datatypes that are simplest, i.e. the ones that live in the UI
thread and without complex logic in their controllers. Follow-up
patches will add support for more.

Bug: 870624
Change-Id: Ibdcc01133103296bd9c53e165a37b63cc32dcb87
Reviewed-on: https://chromium-review.googlesource.com/1251102Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595036}