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We adopt them already in some existing tests and plan to use them in
future patches as part of the migration of session sync to USS.

Bug: 681921
Change-Id: I91bcb5b2d0383be89bef1b905e1d3b16259f94bb
Reviewed-on: https://chromium-review.googlesource.com/983918Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549525}