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Login/lock screen related constants may be used from at least three
places: views-based lock, WebUi based login/lock and wallpaper. So
we want to move them together just as shelf_constants.h

Bug: 732566, 733409
Change-Id: I791d5dfbd02f35cdcc6064b964b97b6978a376d2
Reviewed-on: https://chromium-review.googlesource.com/590483Reviewed-by: Dan Erat <derat@chromium.org>
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491196}