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[Sync] Add a test for closing all tabs

This CL adds a test to check that sessions will be synced when all tabs
are closed. Normally this is the case when all tabs are closed on
Android platform. However it is also possible that the new window has
been opened without any tabs and this state should be synced.

Bug: 1039234
Change-Id: I8f0df377bc72ee505090ad7243ba24067a964af2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2606231Reviewed-by: Maksim Moskvitin <mmoskvitin@google.com>
Commit-Queue: Rushan Suleymanov <rushans@google.com>
Cr-Commit-Position: refs/heads/master@{#844734}