Likely because of https://codereview.chromium.org/2832053003/. The change that makes WallpaperController to move by observing the session state change instead of explicitly called by LoginDisplayHostImpl. If that is the case, this should only happen in 60.0.3078.0 (or later).
Will take a look.
Comment 1 by osh...@chromium.org
, May 3 20174.3 MB
4.3 MB View Download