The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d4804851e053bb6d1b50a0147c346b28274aec27

commit d4804851e053bb6d1b50a0147c346b28274aec27
Author: Mitsuru Oshima <oshima@chromium.org>
Date: Tue Oct 23 05:50:41 2018

Reduce layers in overview mode

* Change ShieldWidget's layer to NOW_DRAWN because it's always transparent.
* Remove layer on image_view/title_view
* Create an layer for unsnappable lable on demand.

Bug:  897870 
Test: no functional change. Updated the unit test.
Change-Id: I23093ade07bc943ad16572d2704b78b13883c3bd
Reviewed-on: https://chromium-review.googlesource.com/c/1295335
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601859}
[modify] https://crrev.com/d4804851e053bb6d1b50a0147c346b28274aec27/ash/wm/overview/overview_utils.cc
[modify] https://crrev.com/d4804851e053bb6d1b50a0147c346b28274aec27/ash/wm/overview/window_grid.cc
[modify] https://crrev.com/d4804851e053bb6d1b50a0147c346b28274aec27/ash/wm/overview/window_selector_item.cc
[modify] https://crrev.com/d4804851e053bb6d1b50a0147c346b28274aec27/ash/wm/overview/window_selector_unittest.cc

oops, fixing label.

This bug requires manual review: M71 has already been promoted to the beta branch, so this requires manual review
Please contact the milestone owner if you have questions.
Owners: benmason@(Android), kariahda@(iOS), kbleicher@(ChromeOS), govind@(Desktop)

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

Pls apply appropriate OSs label. Thank you.

oops sorry. done.

This is a fairly large change so late in the M71 lifecycle.

Also, Per the M71 Branch Announcement: "Have your change checked into the trunk, and tested by you on either a Canary build or Dev channel release before asking for merge approval."   Has this testing taken place?  If so, results?  If not, please test prior to the merge request.  Thanks.

This was tested on canary 72.0.3593.0.

This is one of performance turning tasks that is necessary for meowth.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/55e3572f3cd4f3e98431d4e7bcdbd5606de34935

commit 55e3572f3cd4f3e98431d4e7bcdbd5606de34935
Author: Mitsuru Oshima <oshima@chromium.org>
Date: Thu Nov 01 21:22:15 2018

Reduce layers in overview mode

* Change ShieldWidget's layer to NOW_DRAWN because it's always transparent.
* Remove layer on image_view/title_view
* Create an layer for unsnappable lable on demand.

Bug:  897870 
Test: no functional change. Updated the unit test.
Change-Id: I23093ade07bc943ad16572d2704b78b13883c3bd
Reviewed-on: https://chromium-review.googlesource.com/c/1295335
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#601859}(cherry picked from commit d4804851e053bb6d1b50a0147c346b28274aec27)
Reviewed-on: https://chromium-review.googlesource.com/c/1313558
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/branch-heads/3578@{#461}
Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}
[modify] https://crrev.com/55e3572f3cd4f3e98431d4e7bcdbd5606de34935/ash/wm/overview/overview_utils.cc
[modify] https://crrev.com/55e3572f3cd4f3e98431d4e7bcdbd5606de34935/ash/wm/overview/window_grid.cc
[modify] https://crrev.com/55e3572f3cd4f3e98431d4e7bcdbd5606de34935/ash/wm/overview/window_selector_item.cc
[modify] https://crrev.com/55e3572f3cd4f3e98431d4e7bcdbd5606de34935/ash/wm/overview/window_selector_unittest.cc

Here's a summary of the rules that were executed: 
 - OnlyMergeApprovedChange: Rule Failed -- Revision 55e3572f3cd4f3e98431d4e7bcdbd5606de34935 was merged to refs/branch-heads/3578 branch with no merge approval from a TPM! 
Please explain why this change was merged to the branch!
 - AcknowledgeMerge: Notification Required -- 

The following revision refers to this bug: 
https://chromium.googlesource.com/chromium/src.git/+/55e3572f3cd4f3e98431d4e7bcdbd5606de34935

Commit: 55e3572f3cd4f3e98431d4e7bcdbd5606de34935
Author: oshima@chromium.org
Commiter: oshima@chromium.org
Date: 2018-11-01 21:22:15 +0000 UTC

Reduce layers in overview mode

* Change ShieldWidget's layer to NOW_DRAWN because it's always transparent.
* Remove layer on image_view/title_view
* Create an layer for unsnappable lable on demand.

Bug:  897870 
Test: no functional change. Updated the unit test.
Change-Id: I23093ade07bc943ad16572d2704b78b13883c3bd
Reviewed-on: https://chromium-review.googlesource.com/c/1295335
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#601859}(cherry picked from commit d4804851e053bb6d1b50a0147c346b28274aec27)
Reviewed-on: https://chromium-review.googlesource.com/c/1313558
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/branch-heads/3578@{#461}
Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}

oh sorry I merged wrong CL. Please let me know if you want me revert his and I'll revert.

Which did you intend to merge and which did you merge?

You shouldn't have merged anything since I didn't approve a merge yet (as noted by #14!)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b0246ad98f366471175ab0728b5abaf57e09e43e

commit b0246ad98f366471175ab0728b5abaf57e09e43e
Author: Mitsuru Oshima <oshima@chromium.org>
Date: Fri Nov 02 18:52:29 2018

Revert "Reduce layers in overview mode"

This reverts commit 55e3572f3cd4f3e98431d4e7bcdbd5606de34935.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Reduce layers in overview mode
> 
> * Change ShieldWidget's layer to NOW_DRAWN because it's always transparent.
> * Remove layer on image_view/title_view
> * Create an layer for unsnappable lable on demand.
> 
> Bug:  897870 
> Test: no functional change. Updated the unit test.
> Change-Id: I23093ade07bc943ad16572d2704b78b13883c3bd
> Reviewed-on: https://chromium-review.googlesource.com/c/1295335
> Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
> Reviewed-by: Sammie Quon <sammiequon@chromium.org>
> Cr-Original-Commit-Position: refs/heads/master@{#601859}(cherry picked from commit d4804851e053bb6d1b50a0147c346b28274aec27)
> Reviewed-on: https://chromium-review.googlesource.com/c/1313558
> Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> Cr-Commit-Position: refs/branch-heads/3578@{#461}
> Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}

TBR=oshima@chromium.org

Change-Id: I8c2ab8880fc28bd0e65bcdfc376f13e8d76167ad
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug:  897870 
Reviewed-on: https://chromium-review.googlesource.com/c/1315697
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/branch-heads/3578@{#475}
Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}
[modify] https://crrev.com/b0246ad98f366471175ab0728b5abaf57e09e43e/ash/wm/overview/overview_utils.cc
[modify] https://crrev.com/b0246ad98f366471175ab0728b5abaf57e09e43e/ash/wm/overview/window_grid.cc
[modify] https://crrev.com/b0246ad98f366471175ab0728b5abaf57e09e43e/ash/wm/overview/window_selector_item.cc
[modify] https://crrev.com/b0246ad98f366471175ab0728b5abaf57e09e43e/ash/wm/overview/window_selector_unittest.cc

The following revision refers to this bug: 
https://chromium.googlesource.com/chromium/src.git/+/b0246ad98f366471175ab0728b5abaf57e09e43e

Commit: b0246ad98f366471175ab0728b5abaf57e09e43e
Author: oshima@chromium.org
Commiter: oshima@chromium.org
Date: 2018-11-02 18:52:29 +0000 UTC

Revert "Reduce layers in overview mode"

This reverts commit 55e3572f3cd4f3e98431d4e7bcdbd5606de34935.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Reduce layers in overview mode
> 
> * Change ShieldWidget's layer to NOW_DRAWN because it's always transparent.
> * Remove layer on image_view/title_view
> * Create an layer for unsnappable lable on demand.
> 
> Bug:  897870 
> Test: no functional change. Updated the unit test.
> Change-Id: I23093ade07bc943ad16572d2704b78b13883c3bd
> Reviewed-on: https://chromium-review.googlesource.com/c/1295335
> Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
> Reviewed-by: Sammie Quon <sammiequon@chromium.org>
> Cr-Original-Commit-Position: refs/heads/master@{#601859}(cherry picked from commit d4804851e053bb6d1b50a0147c346b28274aec27)
> Reviewed-on: https://chromium-review.googlesource.com/c/1313558
> Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> Cr-Commit-Position: refs/branch-heads/3578@{#461}
> Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}

TBR=oshima@chromium.org

Change-Id: I8c2ab8880fc28bd0e65bcdfc376f13e8d76167ad
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug:  897870 
Reviewed-on: https://chromium-review.googlesource.com/c/1315697
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/branch-heads/3578@{#475}
Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}

Here's a summary of the rules that were executed: 
 - OnlyMergeApprovedChange: Rule Failed -- Revision b0246ad98f366471175ab0728b5abaf57e09e43e was merged to refs/branch-heads/3578 branch with no merge approval from a TPM! 
Please explain why this change was merged to the branch!
 - AcknowledgeMerge: Notification Required -- 

Tested on canary 72.0.3598.0.0 / 11220.0.0 + nocturne/meowth.

This is one of performance tuning task that we need for m71

The following revision refers to this bug: 
https://chromium.googlesource.com/chromium/src.git/+/da2dfcdd7b5e31ce6168e4028a792d8299eb182b

Commit: da2dfcdd7b5e31ce6168e4028a792d8299eb182b
Author: oshima@chromium.org
Commiter: oshima@chromium.org
Date: 2018-11-05 20:43:09 +0000 UTC

Reland "Reduce layers in overview mode"

This reverts commit b0246ad98f366471175ab0728b5abaf57e09e43e.

Reason for revert: merge is approved

Original change's description:
> Revert "Reduce layers in overview mode"
> 
> This reverts commit 55e3572f3cd4f3e98431d4e7bcdbd5606de34935.
> 
> Reason for revert: <INSERT REASONING HERE>
> 
> Original change's description:
> > Reduce layers in overview mode
> > 
> > * Change ShieldWidget's layer to NOW_DRAWN because it's always transparent.
> > * Remove layer on image_view/title_view
> > * Create an layer for unsnappable lable on demand.
> > 
> > Bug:  897870 
> > Test: no functional change. Updated the unit test.
> > Change-Id: I23093ade07bc943ad16572d2704b78b13883c3bd
> > Reviewed-on: https://chromium-review.googlesource.com/c/1295335
> > Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
> > Reviewed-by: Sammie Quon <sammiequon@chromium.org>
> > Cr-Original-Commit-Position: refs/heads/master@{#601859}(cherry picked from commit d4804851e053bb6d1b50a0147c346b28274aec27)
> > Reviewed-on: https://chromium-review.googlesource.com/c/1313558
> > Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> > Cr-Commit-Position: refs/branch-heads/3578@{#461}
> > Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}
> 
> TBR=oshima@chromium.org
> 
> Change-Id: I8c2ab8880fc28bd0e65bcdfc376f13e8d76167ad
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug:  897870 
> Reviewed-on: https://chromium-review.googlesource.com/c/1315697
> Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> Cr-Commit-Position: refs/branch-heads/3578@{#475}
> Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}

TBR=oshima@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug:  897870 
Change-Id: I52c97fb6f5f79a7ebb80567899481fe29989eba2
Reviewed-on: https://chromium-review.googlesource.com/c/1318537
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/branch-heads/3578@{#523}
Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/da2dfcdd7b5e31ce6168e4028a792d8299eb182b

commit da2dfcdd7b5e31ce6168e4028a792d8299eb182b
Author: Mitsuru Oshima <oshima@chromium.org>
Date: Mon Nov 05 20:43:09 2018

Reland "Reduce layers in overview mode"

This reverts commit b0246ad98f366471175ab0728b5abaf57e09e43e.

Reason for revert: merge is approved

Original change's description:
> Revert "Reduce layers in overview mode"
> 
> This reverts commit 55e3572f3cd4f3e98431d4e7bcdbd5606de34935.
> 
> Reason for revert: <INSERT REASONING HERE>
> 
> Original change's description:
> > Reduce layers in overview mode
> > 
> > * Change ShieldWidget's layer to NOW_DRAWN because it's always transparent.
> > * Remove layer on image_view/title_view
> > * Create an layer for unsnappable lable on demand.
> > 
> > Bug:  897870 
> > Test: no functional change. Updated the unit test.
> > Change-Id: I23093ade07bc943ad16572d2704b78b13883c3bd
> > Reviewed-on: https://chromium-review.googlesource.com/c/1295335
> > Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
> > Reviewed-by: Sammie Quon <sammiequon@chromium.org>
> > Cr-Original-Commit-Position: refs/heads/master@{#601859}(cherry picked from commit d4804851e053bb6d1b50a0147c346b28274aec27)
> > Reviewed-on: https://chromium-review.googlesource.com/c/1313558
> > Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> > Cr-Commit-Position: refs/branch-heads/3578@{#461}
> > Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}
> 
> TBR=oshima@chromium.org
> 
> Change-Id: I8c2ab8880fc28bd0e65bcdfc376f13e8d76167ad
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug:  897870 
> Reviewed-on: https://chromium-review.googlesource.com/c/1315697
> Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> Cr-Commit-Position: refs/branch-heads/3578@{#475}
> Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}

TBR=oshima@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug:  897870 
Change-Id: I52c97fb6f5f79a7ebb80567899481fe29989eba2
Reviewed-on: https://chromium-review.googlesource.com/c/1318537
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/branch-heads/3578@{#523}
Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}
[modify] https://crrev.com/da2dfcdd7b5e31ce6168e4028a792d8299eb182b/ash/wm/overview/overview_utils.cc
[modify] https://crrev.com/da2dfcdd7b5e31ce6168e4028a792d8299eb182b/ash/wm/overview/window_grid.cc
[modify] https://crrev.com/da2dfcdd7b5e31ce6168e4028a792d8299eb182b/ash/wm/overview/window_selector_item.cc
[modify] https://crrev.com/da2dfcdd7b5e31ce6168e4028a792d8299eb182b/ash/wm/overview/window_selector_unittest.cc