The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/eeed0e85ca2805e11b967d095a45099e66a322f4

commit eeed0e85ca2805e11b967d095a45099e66a322f4
Author: Sammie Quon <sammiequon@google.com>
Date: Sat Jun 23 00:14:41 2018

system: System bubble placed correctly when leaving tablet mode.

This does not fix for non-unified system tray.

Test: manual
Bug:  855216 ,  812536 
Change-Id: I1705d248e784ad8f021b4d13d76956187f1d94a1
Reviewed-on: https://chromium-review.googlesource.com/1110946
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569851}
[modify] https://crrev.com/eeed0e85ca2805e11b967d095a45099e66a322f4/ash/system/status_area_widget.cc
[modify] https://crrev.com/eeed0e85ca2805e11b967d095a45099e66a322f4/ash/system/unified/unified_system_tray_bubble.cc
[modify] https://crrev.com/eeed0e85ca2805e11b967d095a45099e66a322f4/ash/system/unified/unified_system_tray_bubble.h
[modify] https://crrev.com/eeed0e85ca2805e11b967d095a45099e66a322f4/ui/views/bubble/tray_bubble_view.cc
[modify] https://crrev.com/eeed0e85ca2805e11b967d095a45099e66a322f4/ui/views/bubble/tray_bubble_view.h