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New button is only visible for child user account. It allows parent to
authorize unlocking child's device.
Parent access button is displayed on lock screen shelf when the device
is locked because of time limits. It might be extended to login screen
shelf in the future to authorize additional actions on child's device.

Parent access button is a part of Parent Access Code feature developed
behind kParentAccess flag.

Bug: 911326
Test: LoginShelfViewTest
Change-Id: I9b513fb6f00ba7882686094761e5528ab3d475fd
Reviewed-on: https://chromium-review.googlesource.com/c/1389166Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Greg Kerr <kerrnel@chromium.org>
Commit-Queue: Aga Wronska <agawronska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619509}