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This CL adds unit tests for the C++ code that generates
human-readable error messages for the smart card PIN errors.

Bug: 1001288
Change-Id: I9ed50272b78237f237e8a6c7834986f7698def81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2095014Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Alexander Hendrich <hendrich@chromium.org>
Commit-Queue: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749260}