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This patch changes only Sync protocol. It extends device info specifics
to support sync invalidations with an invalidations token.

Bug: 1082117
Change-Id: I861bf0d959932b7270c626f7b3445cf5a40ac543
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2214887
Commit-Queue: Rushan Suleymanov <rushans@google.com>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772655}