This is a duplicate bug which sdantuluri@ marked as verfied fixed in ChromeOS 10575.12.0, 67.0.3396.16 beta-channel soraka. 

Which device is this for?

Oh, I see, caroline and kevin.

This issue got repro'd on Chrome OS beta: 10575.32.0, 67.0.3396.41 kevin.

#3 - is it repro'd in M68?

No repro'd on caroline M68 build (10658.0.0, 68.0.3423.0).

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4decb912159aee0557f3170703ce1bde01951d51

commit 4decb912159aee0557f3170703ce1bde01951d51
Author: khmel@google.com <khmel@google.com>
Date: Wed May 16 15:53:25 2018

app_launcher: Fix race condition creating OEM folder.

This fixes one more race condition for OEM folder creation where it is
created on demand on ash side first. This also fixes issue when OEM
folder may appear in ash as normal folder. Plus does refactoring by
discarding passing redundant oem_folder_id.

Test: Manually
Bug:  839024 
Change-Id: I3844e8fbf24fc12c806f25f7c87973eebe167d02
Reviewed-on: https://chromium-review.googlesource.com/1060166
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Yury Khmel <khmel@google.com>
Cr-Commit-Position: refs/heads/master@{#559122}
[modify] https://crrev.com/4decb912159aee0557f3170703ce1bde01951d51/ash/app_list/app_list_controller_impl.cc
[modify] https://crrev.com/4decb912159aee0557f3170703ce1bde01951d51/ash/app_list/app_list_controller_impl.h
[modify] https://crrev.com/4decb912159aee0557f3170703ce1bde01951d51/ash/app_list/model/app_list_folder_item.cc
[modify] https://crrev.com/4decb912159aee0557f3170703ce1bde01951d51/ash/app_list/model/app_list_folder_item.h
[modify] https://crrev.com/4decb912159aee0557f3170703ce1bde01951d51/ash/app_list/model/app_list_model.cc
[modify] https://crrev.com/4decb912159aee0557f3170703ce1bde01951d51/ash/app_list/model/app_list_model_unittest.cc
[modify] https://crrev.com/4decb912159aee0557f3170703ce1bde01951d51/ash/public/interfaces/app_list.mojom
[modify] https://crrev.com/4decb912159aee0557f3170703ce1bde01951d51/chrome/browser/ui/app_list/app_list_model_updater.h
[modify] https://crrev.com/4decb912159aee0557f3170703ce1bde01951d51/chrome/browser/ui/app_list/app_list_syncable_service.cc
[modify] https://crrev.com/4decb912159aee0557f3170703ce1bde01951d51/chrome/browser/ui/app_list/chrome_app_list_model_updater.cc
[modify] https://crrev.com/4decb912159aee0557f3170703ce1bde01951d51/chrome/browser/ui/app_list/chrome_app_list_model_updater.h
[modify] https://crrev.com/4decb912159aee0557f3170703ce1bde01951d51/chrome/browser/ui/app_list/test/fake_app_list_model_updater.cc
[modify] https://crrev.com/4decb912159aee0557f3170703ce1bde01951d51/chrome/browser/ui/app_list/test/fake_app_list_model_updater.h
[modify] https://crrev.com/4decb912159aee0557f3170703ce1bde01951d51/ui/app_list/test/app_list_test_model.cc
[modify] https://crrev.com/4decb912159aee0557f3170703ce1bde01951d51/ui/app_list/test/app_list_test_model.h
[modify] https://crrev.com/4decb912159aee0557f3170703ce1bde01951d51/ui/app_list/views/folder_header_view_unittest.cc

This bug requires manual review: We are only 12 days from stable.
Please contact the milestone owner if you have questions.
Owners: cmasso@(Android), cmasso@(iOS), kbleicher@(ChromeOS), govind@(Desktop)

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

This is a fairly large change this late into M67.  Please provide testing details to verify this is fixed and no unanticipated impact.  Also, do you know why it didn't get resolved per earlier comments?

chrome->ash IPC was introducing recently (66 IIRC) and we had significant amount of race conditions, edge cases. So many problems may look similar but caused by difference issues.

This change actually is not big, It just remove redundant parameter from mojom and this casued mechanical files changes. 
Key changes are:
https://chromium-review.googlesource.com/c/chromium/src/+/1060166/5/ash/app_list/model/app_list_folder_item.cc#16

https://chromium-review.googlesource.com/c/chromium/src/+/1060166/5/chrome/browser/ui/app_list/app_list_syncable_service.cc#256

So I would consider risk as low.

Thanks for the details. Testing passed, no issues?

Locally verified with official build R68-10688.0.0

Merge approved, M67.

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

If all merges have been completed, please remove any remaining Merge-Approved labels from this issue.

Thanks for your time! To disable nags, add the Disable-Nags label.

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/+/f8d8f00c3de844782ae4c9da1db8a3e0a19bac7a

commit f8d8f00c3de844782ae4c9da1db8a3e0a19bac7a
Author: khmel@google.com <khmel@google.com>
Date: Tue May 22 16:29:02 2018

[Merge M67] app_launcher: Fix race condition creating OEM folder.

This fixes one more race condition for OEM folder creation where it is
created on demand on ash side first. This also fixes issue when OEM
folder may appear in ash as normal folder. Plus does refactoring by
discarding passing redundant oem_folder_id.

TBR=khmel@google.com

(cherry picked from commit 4decb912159aee0557f3170703ce1bde01951d51)

Test: Manually
Bug:  839024 
Change-Id: I3844e8fbf24fc12c806f25f7c87973eebe167d02
Reviewed-on: https://chromium-review.googlesource.com/1060166
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Yury Khmel <khmel@google.com>
Cr-Original-Commit-Position: refs/heads/master@{#559122}
Reviewed-on: https://chromium-review.googlesource.com/1066464
Reviewed-by: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/branch-heads/3396@{#675}
Cr-Branched-From: 9ef2aa869bc7bc0c089e255d698cca6e47d6b038-refs/heads/master@{#550428}
[modify] https://crrev.com/f8d8f00c3de844782ae4c9da1db8a3e0a19bac7a/ash/app_list/app_list_controller_impl.cc
[modify] https://crrev.com/f8d8f00c3de844782ae4c9da1db8a3e0a19bac7a/ash/app_list/app_list_controller_impl.h
[modify] https://crrev.com/f8d8f00c3de844782ae4c9da1db8a3e0a19bac7a/ash/app_list/model/app_list_folder_item.cc
[modify] https://crrev.com/f8d8f00c3de844782ae4c9da1db8a3e0a19bac7a/ash/app_list/model/app_list_folder_item.h
[modify] https://crrev.com/f8d8f00c3de844782ae4c9da1db8a3e0a19bac7a/ash/app_list/model/app_list_model.cc
[modify] https://crrev.com/f8d8f00c3de844782ae4c9da1db8a3e0a19bac7a/ash/app_list/model/app_list_model_unittest.cc
[modify] https://crrev.com/f8d8f00c3de844782ae4c9da1db8a3e0a19bac7a/ash/public/interfaces/app_list.mojom
[modify] https://crrev.com/f8d8f00c3de844782ae4c9da1db8a3e0a19bac7a/chrome/browser/ui/app_list/app_list_model_updater.h
[modify] https://crrev.com/f8d8f00c3de844782ae4c9da1db8a3e0a19bac7a/chrome/browser/ui/app_list/app_list_syncable_service.cc
[modify] https://crrev.com/f8d8f00c3de844782ae4c9da1db8a3e0a19bac7a/chrome/browser/ui/app_list/chrome_app_list_model_updater.cc
[modify] https://crrev.com/f8d8f00c3de844782ae4c9da1db8a3e0a19bac7a/chrome/browser/ui/app_list/chrome_app_list_model_updater.h
[modify] https://crrev.com/f8d8f00c3de844782ae4c9da1db8a3e0a19bac7a/chrome/browser/ui/app_list/test/fake_app_list_model_updater.cc
[modify] https://crrev.com/f8d8f00c3de844782ae4c9da1db8a3e0a19bac7a/chrome/browser/ui/app_list/test/fake_app_list_model_updater.h
[modify] https://crrev.com/f8d8f00c3de844782ae4c9da1db8a3e0a19bac7a/ui/app_list/test/app_list_test_model.cc
[modify] https://crrev.com/f8d8f00c3de844782ae4c9da1db8a3e0a19bac7a/ui/app_list/test/app_list_test_model.h
[modify] https://crrev.com/f8d8f00c3de844782ae4c9da1db8a3e0a19bac7a/ui/app_list/views/folder_header_view_unittest.cc