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This CL adds GetWeakCredentials, OnWeakCredentialsChanged,
addWeakCredentialsListener and removeWeakCredentialsListener functions
to provide the ability to use weak credentials in the UI. This CL
updates the StartPasswordCheck in password_check_delegate to also check
credentials for weakness.

Bug: 1119752
Change-Id: I4bfee58ddebda551e41e3833792051527a41beb9
Tbr: rdevlin.cronin@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414271
Commit-Queue: Irina Fedorova <irfedorova@google.com>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808811}