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These should allow tests in upcoming patches to mimic the experimentally
supported scenario where sync the feature is disabled, but the sync
machinery (the engine acting as a transport mechanism) is active as soon
as the user is signed in, in a special mode (subset of datatypes, with
ephemeral storage).

As first user, we introduce a test for USER_CONSENTS.

Bug: 856179,866814,814307
Change-Id: Ie3b6c2da470dde691862a379977b4e01c4f2ead2
Reviewed-on: https://chromium-review.googlesource.com/1160852
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581137}