this is chrome side bug for b/36393672

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/69232cda736bc8b0570bc833ceb2323bf6bcd451

commit 69232cda736bc8b0570bc833ceb2323bf6bcd451
Author: oshima <oshima@chromium.org>
Date: Wed Mar 22 01:30:53 2017

Add black background to ARC maximzied window as well as fullscreen.

BUG= 703731 
TEST=unit tests, manual

Review-Url: https://codereview.chromium.org/2764733002
Cr-Commit-Position: refs/heads/master@{#458609}

[modify] https://crrev.com/69232cda736bc8b0570bc833ceb2323bf6bcd451/components/exo/shell_surface.cc
[modify] https://crrev.com/69232cda736bc8b0570bc833ceb2323bf6bcd451/components/exo/shell_surface_unittest.cc

q

Your change meets the bar and is auto-approved for M58. Please go ahead and merge the CL to branch 3029 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), bhthompson@(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/+/2e536072570112b5d69fb6f62553336f4885f8cd

commit 2e536072570112b5d69fb6f62553336f4885f8cd
Author: Mitsuru Oshima <oshima@chromium.org>
Date: Thu Mar 23 22:46:44 2017

Add black background to ARC maximzied window as well as fullscreen.

BUG= 703731 
TEST=unit tests, manual

Review-Url: https://codereview.chromium.org/2764733002
Cr-Commit-Position: refs/heads/master@{#458609}
(cherry picked from commit 69232cda736bc8b0570bc833ceb2323bf6bcd451)

Review-Url: https://codereview.chromium.org/2771663005 .
Cr-Commit-Position: refs/branch-heads/3029@{#398}
Cr-Branched-From: 939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}

[modify] https://crrev.com/2e536072570112b5d69fb6f62553336f4885f8cd/components/exo/shell_surface.cc
[modify] https://crrev.com/2e536072570112b5d69fb6f62553336f4885f8cd/components/exo/shell_surface_unittest.cc