The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c18f66cce628e31fbde34fa521e526fafeab4839

commit c18f66cce628e31fbde34fa521e526fafeab4839
Author: wutao <wutao@chromium.org>
Date: Fri Jun 02 18:11:01 2017

cros: Do not cache |root_window| in ScreenRotationAnimator.

When removing a display the |root_window| might change. The cache does
not work in this situation.

BUG= 728029 
TEST=manual and ScreenRotationAnimatorSmoothAnimationTest.*

Review-Url: https://codereview.chromium.org/2910413002
Cr-Commit-Position: refs/heads/master@{#476723}

[modify] https://crrev.com/c18f66cce628e31fbde34fa521e526fafeab4839/ash/display/display_configuration_controller.cc
[modify] https://crrev.com/c18f66cce628e31fbde34fa521e526fafeab4839/ash/display/display_configuration_controller.h
[modify] https://crrev.com/c18f66cce628e31fbde34fa521e526fafeab4839/ash/display/display_configuration_controller_unittest.cc
[modify] https://crrev.com/c18f66cce628e31fbde34fa521e526fafeab4839/ash/rotator/screen_rotation_animator.cc
[modify] https://crrev.com/c18f66cce628e31fbde34fa521e526fafeab4839/ash/rotator/screen_rotation_animator.h
[modify] https://crrev.com/c18f66cce628e31fbde34fa521e526fafeab4839/ash/rotator/screen_rotation_animator_unittest.cc
[modify] https://crrev.com/c18f66cce628e31fbde34fa521e526fafeab4839/ash/test/display_configuration_controller_test_api.cc
[modify] https://crrev.com/c18f66cce628e31fbde34fa521e526fafeab4839/ash/test/display_configuration_controller_test_api.h
[modify] https://crrev.com/c18f66cce628e31fbde34fa521e526fafeab4839/testing/buildbot/filters/ash_unittests_mash.filter
[modify] https://crrev.com/c18f66cce628e31fbde34fa521e526fafeab4839/testing/buildbot/filters/ash_unittests_mus.filter

Please tag with appropriate OSs.  Thanks.

Your change meets the bar and is auto-approved for M60. Please go ahead and merge the CL to branch 3112 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), josafat@(ChromeOS), bustamante@(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/+/6b279cbf120d6f980b40633aa6cb76d8e6af1125

commit 6b279cbf120d6f980b40633aa6cb76d8e6af1125
Author: Qiang Xu <warx@chromium.org>
Date: Mon Jun 05 18:35:54 2017

[merge to m60] cros: Do not cache |root_window| in ScreenRotationAnimator.

Merget to m60 on behalf of wutao

When removing a display the |root_window| might change. The cache does
not work in this situation.

TBR=oshima@chromium.org
BUG= 728029 
TEST=manual and ScreenRotationAnimatorSmoothAnimationTest.*

Review-Url: https://codereview.chromium.org/2910413002
Cr-Original-Commit-Position: refs/heads/master@{#476723}
Review-Url: https://codereview.chromium.org/2919393002 .
Cr-Commit-Position: refs/branch-heads/3112@{#161}
Cr-Branched-From: b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}

[modify] https://crrev.com/6b279cbf120d6f980b40633aa6cb76d8e6af1125/ash/display/display_configuration_controller.cc
[modify] https://crrev.com/6b279cbf120d6f980b40633aa6cb76d8e6af1125/ash/display/display_configuration_controller.h
[modify] https://crrev.com/6b279cbf120d6f980b40633aa6cb76d8e6af1125/ash/display/display_configuration_controller_unittest.cc
[modify] https://crrev.com/6b279cbf120d6f980b40633aa6cb76d8e6af1125/ash/rotator/screen_rotation_animator.cc
[modify] https://crrev.com/6b279cbf120d6f980b40633aa6cb76d8e6af1125/ash/rotator/screen_rotation_animator.h
[modify] https://crrev.com/6b279cbf120d6f980b40633aa6cb76d8e6af1125/ash/rotator/screen_rotation_animator_unittest.cc
[modify] https://crrev.com/6b279cbf120d6f980b40633aa6cb76d8e6af1125/ash/test/display_configuration_controller_test_api.cc
[modify] https://crrev.com/6b279cbf120d6f980b40633aa6cb76d8e6af1125/ash/test/display_configuration_controller_test_api.h
[modify] https://crrev.com/6b279cbf120d6f980b40633aa6cb76d8e6af1125/testing/buildbot/filters/ash_unittests_mus.filter