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Add a bunch of unit tests for the <security-token-pin> Polymer element.

Bug: 1033936
Change-Id: I9b9545815c45c46074137604d71e0ddb72a2a081
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2116194Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Commit-Queue: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753248}