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SerializeAsNigoriLocalData() converts state of the Nigori's bridge and
processor (i.e. sync metadata) to NigoriLocalData proto, that will be
used for persistence.

Side changes: Cryptographer interface is extended by adding ToProto()
method, NigoriLocalData |keystore_keys| field renamed to
|keystore_key| (singular form fits better for repeated proto fields).

Bug: 922900
Change-Id: I9535008f221b755a389a6ca74c6d0593304ee3a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1768325Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Cr-Commit-Position: refs/heads/master@{#692609}