The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/fc6246bf77d83c9f91026169a12eba987ed7a4c4

commit fc6246bf77d83c9f91026169a12eba987ed7a4c4
Author: Mitsuru Oshima <oshima@chromium.org>
Date: Fri Oct 20 22:45:32 2017

Do not update the layout mirror mode in forced mirror mode.

We shouldn't store even in memory if the mirror mode
was forced because it may be used when the display change event
is sent.

BUG= 776157 
TEST=covered by unit test. Tested manually on kevin/caroline.

Change-Id: I5063a88760ec4bc2cb25c28f248082a78f95e1fd
Reviewed-on: https://chromium-review.googlesource.com/727280
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510591}
[modify] https://crrev.com/fc6246bf77d83c9f91026169a12eba987ed7a4c4/ash/display/display_manager_unittest.cc
[modify] https://crrev.com/fc6246bf77d83c9f91026169a12eba987ed7a4c4/ui/display/manager/display_layout_store.cc

Your change meets the bar and is auto-approved for M63. Please go ahead and merge the CL to branch 3239 manually. Please contact milestone owner if you have questions.
Owners: cmasso@(Android), cmasso@(iOS), gkihumba@(ChromeOS), govind@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9bb4b7132de770dce7aaea8b48a257e14a728b48

commit 9bb4b7132de770dce7aaea8b48a257e14a728b48
Author: Mitsuru Oshima <oshima@chromium.org>
Date: Mon Oct 23 20:17:26 2017

Do not update the layout mirror mode in forced mirror mode.

We shouldn't store even in memory if the mirror mode
was forced because it may be used when the display change event
is sent.

BUG= 776157 
TEST=covered by unit test. Tested manually on kevin/caroline.

Change-Id: I5063a88760ec4bc2cb25c28f248082a78f95e1fd
Reviewed-on: https://chromium-review.googlesource.com/727280
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#510591}(cherry picked from commit fc6246bf77d83c9f91026169a12eba987ed7a4c4)
Reviewed-on: https://chromium-review.googlesource.com/733948
Cr-Commit-Position: refs/branch-heads/3239@{#163}
Cr-Branched-From: adb61db19020ed8ecee5e91b1a0ea4c924ae2988-refs/heads/master@{#508578}
[modify] https://crrev.com/9bb4b7132de770dce7aaea8b48a257e14a728b48/ash/display/display_manager_unittest.cc
[modify] https://crrev.com/9bb4b7132de770dce7aaea8b48a257e14a728b48/ui/display/manager/display_layout_store.cc