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Each flag maps to one feature toggle representing one (usually) or two
(rarely) sync datatypes.

If enabled, the sync datatype(s) are wrapped within the USS
architecture, based on the so-called pseudo-USS approach
(SyncableServiceBasedBridge).

The functionality has been sanity-checked for crashes on dev&canary
already, although some resulting UMA is suspicious. The flags should
allow easier debugging and testing.

Bug: 870624
Change-Id: Id5762c01f7232de8dda4e524083fae59f66217a2
Reviewed-on: https://chromium-review.googlesource.com/c/1329142
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606991}