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The directory implementation is different because directory keeps
a copy of the server data and then compares it to the newly version.
For USS, no copy is maintained and hence we have to create specifics
and push to the server when there is a local update.

Bug: 516866
Change-Id: Ic0a43b210866120c8ec209681e719d634fa10255
Reviewed-on: https://chromium-review.googlesource.com/1206410Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589865}