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This patch introduces unit tests for the client tag based remote update
handler. Most of cases are copied from the model type processor unit
tests.

Bug: 947044
Change-Id: Iac2bde9c59425760dad5c6847e7b398dec8dfe3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2152786
Commit-Queue: Rushan Suleymanov <rushans@google.com>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760439}