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Also implemented all of the states for the password check (matches the JS frontend ones) and added tests for the Observer logic.

Bug: 1015841
Change-Id: Ie2485cdb406ea0ac44b79d4f3456bf0e7644bbe6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2076477
Commit-Queue: Andrey Zaytsev <andzaytsev@google.com>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746741}