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The patch introduces a feature toggle that can enable sync datatype in
DeviceInfo for users that are signed-in but not sync-ing.

In this simplest form, the regular instance of the model
(DeviceInfoTracker) is reused and storage is persistent. Follow-up
patches will polish this behavior.

The patch also introduces the first sync integration tests for
DeviceInfo, both prior to and after the newly supported transport-
only mode (i.e. sync the feature not enabled).

Bug: 1005651
Change-Id: I7399139f0ea506654d2df80e7c8e508853bec408
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816560
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699000}