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This CL add the logic to merge the local model with the remote model
upon first enable sync.


Bug: 516866
Change-Id: I8c53c5167b1bc3305f9339a9a0e2a8ffb1702ffb
Reviewed-on: https://chromium-review.googlesource.com/1150523
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580296}