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This CL introduces checking the password sync token for SAML users on
the login screen. If the token is already set in local settings we poll
the token API and update login screen to online authentication if the
token is not valid.

Bug: 1090341
Change-Id: I93fed049cf4050d4114143dd971614d3fa22740e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438493
Commit-Queue: Maciek Slusarczyk <mslus@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818483}