The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a87fc3285677f9c3903542925e1fc7f2a1dbacaf

commit a87fc3285677f9c3903542925e1fc7f2a1dbacaf
Author: Sammie Quon <sammiequon@google.com>
Date: Fri Nov 10 17:43:37 2017

shelf: Do not animate to/from tablet mode if alignments are different.

Also remove some code which handles placing the back/launcher button
when the alignment is on the left/right for tablet mode (alignment is
forced bottom for tablet mode now).

Test: manual
Bug:  767584 
Change-Id: If01d403589222e2afb0d048d198fa341a933057e
Reviewed-on: https://chromium-review.googlesource.com/759420
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515588}
[modify] https://crrev.com/a87fc3285677f9c3903542925e1fc7f2a1dbacaf/ash/shelf/app_list_button.cc
[modify] https://crrev.com/a87fc3285677f9c3903542925e1fc7f2a1dbacaf/ash/shelf/shelf.h
[modify] https://crrev.com/a87fc3285677f9c3903542925e1fc7f2a1dbacaf/ash/shelf/shelf_controller.cc
[modify] https://crrev.com/a87fc3285677f9c3903542925e1fc7f2a1dbacaf/ash/shelf/shelf_view.cc
[modify] https://crrev.com/a87fc3285677f9c3903542925e1fc7f2a1dbacaf/ash/shelf/shelf_view.h
[modify] https://crrev.com/a87fc3285677f9c3903542925e1fc7f2a1dbacaf/ash/shelf/shelf_view_unittest.cc