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This CL implements the remote creation of bookmarks on the server.
It take many shortcuts that will be addressed in later patches such as
a naive ordering algorithm that assumes all bookmarks are created
under the bookmarks bar directly.

Bug: 516866
Change-Id: I10059fd3b7521927fb4db6b9ce0284f33fadead8
Reviewed-on: https://chromium-review.googlesource.com/1017201
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557154}