Taking this one.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/636c518a9cb1df3d728e6a3c25d39d4393998eff

commit 636c518a9cb1df3d728e6a3c25d39d4393998eff
Author: Mounir Lamouri <mlamouri@chromium.org>
Date: Thu Jul 26 05:03:14 2018

Picture-in-Picture: playback state change shouldn't show icons.

Updating the views visibility overrides the layer's visibility. This
makes sure the layer is set back to the correct visibility when the
views' one is updated in order to avoid the pause button to show up in
cases such as a playlist.

Bug:  863497 
Change-Id: I0d9ce10b1219ea3af492269e228988f51c54b3e2
Reviewed-on: https://chromium-review.googlesource.com/1149507
Reviewed-by: apacible <apacible@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578209}
[modify] https://crrev.com/636c518a9cb1df3d728e6a3c25d39d4393998eff/chrome/browser/picture_in_picture/picture_in_picture_window_controller_browsertest.cc
[modify] https://crrev.com/636c518a9cb1df3d728e6a3c25d39d4393998eff/chrome/browser/ui/views/overlay/overlay_window_views.cc
[modify] https://crrev.com/636c518a9cb1df3d728e6a3c25d39d4393998eff/chrome/browser/ui/views/overlay/overlay_window_views.h

Your change meets the bar and is auto-approved for M69. Please go ahead and merge the CL to branch 3497 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), kariahda@(iOS), cindyb@(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/+/e8fe1cda2e3d3ad548ae98d0528a3eb4ed206744

commit e8fe1cda2e3d3ad548ae98d0528a3eb4ed206744
Author: Mounir Lamouri <mlamouri@chromium.org>
Date: Fri Jul 27 15:23:09 2018

Picture-in-Picture: playback state change shouldn't show icons.

Updating the views visibility overrides the layer's visibility. This
makes sure the layer is set back to the correct visibility when the
views' one is updated in order to avoid the pause button to show up in
cases such as a playlist.

Bug:  863497 
Change-Id: I0d9ce10b1219ea3af492269e228988f51c54b3e2
Reviewed-on: https://chromium-review.googlesource.com/1149507
Reviewed-by: apacible <apacible@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#578209}(cherry picked from commit 636c518a9cb1df3d728e6a3c25d39d4393998eff)
Reviewed-on: https://chromium-review.googlesource.com/1152372
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/branch-heads/3497@{#151}
Cr-Branched-From: 271eaf50594eb818c9295dc78d364aea18c82ea8-refs/heads/master@{#576753}
[modify] https://crrev.com/e8fe1cda2e3d3ad548ae98d0528a3eb4ed206744/chrome/browser/picture_in_picture/picture_in_picture_window_controller_browsertest.cc
[modify] https://crrev.com/e8fe1cda2e3d3ad548ae98d0528a3eb4ed206744/chrome/browser/ui/views/overlay/overlay_window_views.cc
[modify] https://crrev.com/e8fe1cda2e3d3ad548ae98d0528a3eb4ed206744/chrome/browser/ui/views/overlay/overlay_window_views.h