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...and wire them into the respective SyncClient implementations.
The feature flag for this service is still disabled, so this causes no
behavior change yet.

Bug: 1102314
Change-Id: I3a06470b2faf0cc9941e90024cf7ba672a70a99f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2397736
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805418}