The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/70654b32bcb0dc017d2f6479e7c42772ab811c4c

commit 70654b32bcb0dc017d2f6479e7c42772ab811c4c
Author: Weidong Guo <weidongg@chromium.org>
Date: Thu Oct 12 02:12:03 2017

Merge dual extended with multi extended

Changes:
Merge usages of MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED and
MULTIPLE_DISPLAY_STATE_MULTI_EXTENDED to simplify MultipleDisplayState.

BUG= 773462 

Change-Id: I991af360115c23095a6b69b342b7445e8c15906d
Reviewed-on: https://chromium-review.googlesource.com/710229
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Weidong Guo <weidongg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#508224}
[modify] https://crrev.com/70654b32bcb0dc017d2f6479e7c42772ab811c4c/ash/display/display_error_observer_chromeos_unittest.cc
[modify] https://crrev.com/70654b32bcb0dc017d2f6479e7c42772ab811c4c/ash/display/display_manager_unittest.cc
[modify] https://crrev.com/70654b32bcb0dc017d2f6479e7c42772ab811c4c/ui/display/manager/chromeos/display_change_observer.cc
[modify] https://crrev.com/70654b32bcb0dc017d2f6479e7c42772ab811c4c/ui/display/manager/chromeos/display_configurator.cc
[modify] https://crrev.com/70654b32bcb0dc017d2f6479e7c42772ab811c4c/ui/display/manager/chromeos/display_configurator_unittest.cc
[modify] https://crrev.com/70654b32bcb0dc017d2f6479e7c42772ab811c4c/ui/display/manager/chromeos/display_util.cc
[modify] https://crrev.com/70654b32bcb0dc017d2f6479e7c42772ab811c4c/ui/display/manager/chromeos/query_content_protection_task_unittest.cc
[modify] https://crrev.com/70654b32bcb0dc017d2f6479e7c42772ab811c4c/ui/display/manager/chromeos/update_display_configuration_task.cc
[modify] https://crrev.com/70654b32bcb0dc017d2f6479e7c42772ab811c4c/ui/display/manager/chromeos/update_display_configuration_task_unittest.cc
[modify] https://crrev.com/70654b32bcb0dc017d2f6479e7c42772ab811c4c/ui/display/manager/display_manager.cc
[modify] https://crrev.com/70654b32bcb0dc017d2f6479e7c42772ab811c4c/ui/display/types/display_constants.h