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New test mimics server-side behavior for triggering keystore key
rotation: generation of new keystore key with touching the Nigori
node. After that client should receive updated keystore keys and the
same Nigori node as it already has (modulo metadata update). The client
should commit the new Nigori node with rotated keystore key and this
verified by checking |encryption_keybag| encryption key name.

Bug: 922900
Change-Id: I91b86bbb0f68a55fdcc10049fa90afa70dc32155
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1887611Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Auto-Submit: Maksim Moskvitin <mmoskvitin@google.com>
Cr-Commit-Position: refs/heads/master@{#712502}