Test failures started from:
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.13%20Tests%20%28dbg%29/4717

The "mac-cocoa-rel" bot is also failing:
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/mac-cocoa-rel/898

"Mac10.11 Tests"
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.11%20Tests/28593

"Mac10.12 Tests"
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.12%20Tests/14941

Speculative revert:
https://chromium-review.googlesource.com/c/chromium/src/+/1177021

The speculative revert didn't work and I relanded it:
https://chromium-review.googlesource.com/c/chromium/src/+/1177103

(I'm now handling other failures)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3fbd268b75c69b6c755cfcf59fab7ec731116b4b

commit 3fbd268b75c69b6c755cfcf59fab7ec731116b4b
Author: Hiroki Nakagawa <nhiroki@chromium.org>
Date: Thu Aug 16 07:02:08 2018

Revert "Whitelist the run loop mode that AppKit uses to animate the menu in fullscreen."

This reverts commit b22ea1fa7081741279cfffeed61c0c19da4c0a23.

Reason for revert:
Let me speculatively revert for test failures on the mac bots.
 https://crbug.com/874716 

Apparently this CL passes all try bots on the review page,
but it fails some experimental fyi tests.
See "browser_tests on (none) GPU on Mac (with patch, experimental)":
https://ci.chromium.org/p/chromium/builders/luci.chromium.try/mac_chromium_rel_ng/118766

I'll reland this CL if this is not relevant.

Bug:  874716 

Original change's description:
> Whitelist the run loop mode that AppKit uses to animate the menu in fullscreen.
> 
> This stops UI animation and video from freezing during the animation.
> Also move some constants to test-accessible location and delete the
> duplicates in the tests.
> 
> Bug:  554993 
> Change-Id: Ie4585fa405b32e8bdae984d5a4ffac700c1375ab
> Reviewed-on: https://chromium-review.googlesource.com/1166169
> Reviewed-by: Mark Mentovai <mark@chromium.org>
> Commit-Queue: Sidney San Martín <sdy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#583361}

TBR=sdy@chromium.org,mark@chromium.org

Change-Id: I3fc77024fb7d82a8c79bad1b357475fb900d87d9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug:  554993 
Reviewed-on: https://chromium-review.googlesource.com/1176903
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583568}
[modify] https://crrev.com/3fbd268b75c69b6c755cfcf59fab7ec731116b4b/base/message_loop/message_pump_mac.h
[modify] https://crrev.com/3fbd268b75c69b6c755cfcf59fab7ec731116b4b/base/message_loop/message_pump_mac.mm
[modify] https://crrev.com/3fbd268b75c69b6c755cfcf59fab7ec731116b4b/base/message_loop/message_pump_mac_unittest.mm

I'm back :)

I landed the speculative revert and now I'm monitoring the tree...

New sheriff here. :)
I tested the revert locally on MacOS 10.13 and can confirm that it fixes the problem. Still waiting for the bots to confirm.

 Issue 874765  has been merged into this issue.

No longer failing on the bots.