The patch that introduced the flakiness has also been merged. So I will disable this test until it can be updated.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f84f1651cc79986e851bebcbb5c3e9bc124ab63e

commit f84f1651cc79986e851bebcbb5c3e9bc124ab63e
Author: jonross <jonross@chromium.org>
Date: Thu May 03 15:23:44 2018

Disable WorkspaceLayoutManagerBackdropTest.OpenAppListInOverviewMode

The test WorkspaceLayoutManagerBackdropTest.OpenAppListInOverviewMode is flaking
so I'm disabling.

TBR= xiyuan@chromium.org
TEST=WorkspaceLayoutManagerBackdropTest.OpenAppListInOverviewMode

Bug: 838756
Change-Id: I68f90b668996a885ef37e047d453e6ecca12217c
Reviewed-on: https://chromium-review.googlesource.com/1042350
Reviewed-by: Jonathan Ross <jonross@chromium.org>
Commit-Queue: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555739}
[modify] https://crrev.com/f84f1651cc79986e851bebcbb5c3e9bc124ab63e/ash/wm/workspace/workspace_layout_manager_unittest.cc

It was suspected that https://chromium-review.googlesource.com/c/chromium/src/+/1040533 would fix the mash crash. (rev 555538)

However the failure has shown on newer runs (rev 555717):
https://luci-milo.appspot.com/buildbot/chromium.memory/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20%281%29/27302

The new failure is

[ RUN      ] WorkspaceLayoutManagerBackdropTest.OpenAppListInOverviewMode
[28967:28967:0503/090443.840635:3665664633:FATAL:scoped_render_pass_texture.cc(110)] Check failed: context_provider_->ContextCapabilities().texture_npot.

related to issue 803286. Not sure why this test triggers it though.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6d730ee7e25d0c76ea769914442de439f32c3611

commit 6d730ee7e25d0c76ea769914442de439f32c3611
Author: Min Chen <minch@google.com>
Date: Fri May 04 18:44:38 2018

Disable WorkspaceLayoutManagerBackdropTest.OpenAppListInOverviewMode in asan.

Bug: 838756,  838822 ,  837092 
Change-Id: I9f7fcb79a8305632ca264324f69aee1ae7d2ac71
Reviewed-on: https://chromium-review.googlesource.com/1042868
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Min Chen <minch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556132}
[modify] https://crrev.com/6d730ee7e25d0c76ea769914442de439f32c3611/ash/wm/workspace/workspace_layout_manager_unittest.cc

This test is flaky in non-asan too, failed e.g. here: https://ci.chromium.org/p/chromium/builders/luci.chromium.try/linux-chromeos-rel/23993

Detected 21 new flakes for test/step "WorkspaceLayoutManagerBackdropTest.OpenAppListInOverviewMode". To see the actual flakes, please visit https://chromium-try-flakes.appspot.com/all_flake_occurrences?key=ahVzfmNocm9taXVtLXRyeS1mbGFrZXNyRwsSBUZsYWtlIjxXb3Jrc3BhY2VMYXlvdXRNYW5hZ2VyQmFja2Ryb3BUZXN0Lk9wZW5BcHBMaXN0SW5PdmVydmlld01vZGUM. This message was posted automatically by the chromium-try-flakes app. Since flakiness is ongoing, the issue was moved back into Sheriff Bug Queue (unless already there).

Still very flaky on luci.chromium.try:linux-chromeos-rel: https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=mash_ash_unittests&builder=tryserver.chromium.chromiumos%3Alinux-chromeos-rel

Detected 21 new flakes for test/step "WorkspaceLayoutManagerBackdropTest.OpenAppListInOverviewMode". To see the actual flakes, please visit https://chromium-try-flakes.appspot.com/all_flake_occurrences?key=ahVzfmNocm9taXVtLXRyeS1mbGFrZXNyRwsSBUZsYWtlIjxXb3Jrc3BhY2VMYXlvdXRNYW5hZ2VyQmFja2Ryb3BUZXN0Lk9wZW5BcHBMaXN0SW5PdmVydmlld01vZGUM. This message was posted automatically by the chromium-try-flakes app.

Detected 7 new flakes for test/step "WorkspaceLayoutManagerBackdropTest.OpenAppListInOverviewMode". To see the actual flakes, please visit https://chromium-try-flakes.appspot.com/all_flake_occurrences?key=ahVzfmNocm9taXVtLXRyeS1mbGFrZXNyRwsSBUZsYWtlIjxXb3Jrc3BhY2VMYXlvdXRNYW5hZ2VyQmFja2Ryb3BUZXN0Lk9wZW5BcHBMaXN0SW5PdmVydmlld01vZGUM. This message was posted automatically by the chromium-try-flakes app.

Detected 4 new flakes for test/step "WorkspaceLayoutManagerBackdropTest.OpenAppListInOverviewMode". To see the actual flakes, please visit https://chromium-try-flakes.appspot.com/all_flake_occurrences?key=ahVzfmNocm9taXVtLXRyeS1mbGFrZXNyRwsSBUZsYWtlIjxXb3Jrc3BhY2VMYXlvdXRNYW5hZ2VyQmFja2Ryb3BUZXN0Lk9wZW5BcHBMaXN0SW5PdmVydmlld01vZGUM. This message was posted automatically by the chromium-try-flakes app.

I'll go ahead and disable the test.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/200e86c1d76d0c83ee18951695bcbad016d7f2fc

commit 200e86c1d76d0c83ee18951695bcbad016d7f2fc
Author: Marc Treib <treib@chromium.org>
Date: Mon Jun 18 13:29:18 2018

Disable flaky WorkspaceLayoutManagerBackdropTest.OpenAppListInOverviewMode

TBR=minch@chromium.org
NOTRY=true

Bug: 838756
Change-Id: I3cf207f31b7063f64c87d7cc0d8a93e6299ed5cd
Reviewed-on: https://chromium-review.googlesource.com/1104418
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567986}
[modify] https://crrev.com/200e86c1d76d0c83ee18951695bcbad016d7f2fc/ash/wm/workspace/workspace_layout_manager_unittest.cc

Detected 3 new flakes for test/step "WorkspaceLayoutManagerBackdropTest.OpenAppListInOverviewMode". To see the actual flakes, please visit https://chromium-try-flakes.appspot.com/all_flake_occurrences?key=ahVzfmNocm9taXVtLXRyeS1mbGFrZXNyRwsSBUZsYWtlIjxXb3Jrc3BhY2VMYXlvdXRNYW5hZ2VyQmFja2Ryb3BUZXN0Lk9wZW5BcHBMaXN0SW5PdmVydmlld01vZGUM. This message was posted automatically by the chromium-try-flakes app. Since flakiness is ongoing, the issue was moved back into Sheriff Bug Queue (unless already there).