The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/da082c748163f71334651cc9d7506d18b2e169e9

commit da082c748163f71334651cc9d7506d18b2e169e9
Author: oshima <oshima@chromium.org>
Date: Thu Feb 09 21:30:08 2017

Skip UpdateShadow if the surface has already been destroyed

BUG= 690515 , 687742 

Review-Url: https://codereview.chromium.org/2681233003
Cr-Commit-Position: refs/heads/master@{#449415}

[modify] https://crrev.com/da082c748163f71334651cc9d7506d18b2e169e9/components/exo/shell_surface.cc

Your change meets the bar and is auto-approved for M57. Please go ahead and merge the CL to branch 2987 manually. Please contact milestone owner if you have questions.
Owners: amineer@(clank), cmasso@(bling), ketakid@(cros), 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/+/f9eac9bcd626246dfab4b350a50ae470b0f7b2dd

commit f9eac9bcd626246dfab4b350a50ae470b0f7b2dd
Author: Mitsuru Oshima <oshima@chromium.org>
Date: Mon Feb 13 01:34:22 2017

Skip UpdateShadow if the surface has already been destroyed

BUG= 690515 , 687742 

Review-Url: https://codereview.chromium.org/2681233003
Cr-Commit-Position: refs/heads/master@{#449415}
(cherry picked from commit da082c748163f71334651cc9d7506d18b2e169e9)

Review-Url: https://codereview.chromium.org/2690713002 .
Cr-Commit-Position: refs/branch-heads/2987@{#470}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}

[modify] https://crrev.com/f9eac9bcd626246dfab4b350a50ae470b0f7b2dd/components/exo/shell_surface.cc