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This CL implements bottom bar with "Cancel" and "Confirm" buttons in
SyncAndServicesPreferences. This bottom bar is only shown when the user
opens SyncAndServicesPreferences screen from the sign-in screen.

Bug: 914056
Change-Id: I3f5f2002ab7bcd566f3305fd2344a79069bb82fb
Reviewed-on: https://chromium-review.googlesource.com/c/1435276Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630098}