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When user clicks on the easy-unlock icon on "Click to enter" lock screen
(i.e. when lock screen auth type is USER_CLICK), the lock screen changes to
state in which password is required to unlock the screen.
This adds new auth state FORCE_OFFLINE_PASSWORD which, unlike OFFLINE_PASSWORD,
can't be changed to any other.

BUG=397363
TBR=asargent@chromium.org

Review URL: https://codereview.chromium.org/456943003

Cr-Commit-Position: refs/heads/master@{#290096}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@290096 0039d316-1c4b-4281-b951-d872f2087c98