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Clients will send the flag which will indicate that the client is not
aware of any other clients. This is useful to prevent trying to send
invalidations from the server.

The single client flag is calculated based on known device infos.
Devices which don't have recent enough updates are considered
non-active.

Bug: 1145942
Change-Id: Ia24cb880e361b65796ea8c516ef38c1bfed58b12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533775
Commit-Queue: Rushan Suleymanov <rushans@google.com>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826891}