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This CL adds a method to the login data dispatcher that shows the
parent access widget and uses it to only allow parents to change the
clock when there is a child signed in or a child is a device owner.

Bug: 921145
Change-Id: Ifd83760f8b9000576570f85c895d34c76c4c8bb1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1621392Reviewed-by: Aga Wronska <agawronska@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Henrique Grandinetti <hgrandinetti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665149}