GitLab

[Demo videos]
- account with bookmarks:
https://drive.google.com/open?id=0B1O0Z7eoZMuGeTBjVXdla0RPeFE
- account with no bookmarks:
https://drive.google.com/open?id=0B1O0Z7eoZMuGR0pGb2tYUHcyOWM

TEST=Make sure it works when signed in user has no bookmarks or there is any sync error...

Bug: 696893
Change-Id: I30a29eed423253651ff2466943c8ecdd6974e0b0
Reviewed-on: https://chromium-review.googlesource.com/569538
Commit-Queue: Marti Wong <martiw@chromium.org>
Reviewed-by: Jean-François Geyelin <jif@chromium.org>
Reviewed-by: Eric Noyau <noyau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487374}