yamaguchi@, can this be related to the recent touch updates?

I've identified cr.ui.Splitter is not receiving mousedown event at all after this change as it's been cancelled at pointerdown event.
https://chromium-review.googlesource.com/c/chromium/src/+/641010/9/ui/file_manager/file_manager/foreground/js/ui/file_table.js
So we're reverting the change.

https://chromium.googlesource.com/chromium/src.git/+/0c2197b56fc84a027edb276958201cef7d0952a8

commit 0c2197b56fc84a027edb276958201cef7d0952a8
Author: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Date: Fri Sep 08 12:49:43 2017

Revert "Prevent long-tapping on the header from changing focus."

This reverts commit 128d8d0b7d28106be840701b9e3aa87fe7ae07e4.

Reason for revert: Regression; it prevented "resize column by mouse drag" functionality.
https://bugs.chromium.org/p/chromium/issues/detail?id=763316

Considering the branch point, this issue should be happening on M62 now.
This is relatively large impact although the fix is simple.
Should we merge the fix to M62 branch as well?

Yes, let's merge the revert to M62.

Your change meets the bar and is auto-approved for M62. Please go ahead and merge the CL to branch 3202 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), bhthompson@(ChromeOS), abdulsyed@(Desktop)

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

The fix was merged to M62.
The commit message was updated on https://bugs.chromium.org/p/chromium/issues/detail?id=752389#c20
I manually changed the label Merge-Merged-62 to merge-merged-3202 on this issue.

-----------------------------------------------------------------
The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ae3d372b13143030f8e0e5284d812ae9a6df6709

commit ae3d372b13143030f8e0e5284d812ae9a6df6709
Author: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Date: Mon Sep 11 10:58:06 2017

Revert "Prevent long-tapping on the header from changing focus."

This reverts commit 128d8d0b7d28106be840701b9e3aa87fe7ae07e4.

Reason for revert: Regression; it prevented "resize column by mouse drag" functionality.
https://bugs.chromium.org/p/chromium/issues/detail?id=763316

Original change's description:
> Prevent long-tapping on the header from changing focus.
> 
> Before:
> Long-tapping the header caused losing focus on the list by triggering a 'contextmenu'
> After:
> Focus is no longer lost when long-tapping the header.
> 
> Bug:  752389 
> Test: manual tests
> Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
> Change-Id: I9e9bb58955feefc91d5b6425d2b020aad0a2949a
> Reviewed-on: https://chromium-review.googlesource.com/641010
> Reviewed-by: Naoki Fukino <fukino@chromium.org>
> Reviewed-by: Keigo Oka <oka@chromium.org>
> Commit-Queue: Marianne Thieffry <mariannet@google.com>
> Cr-Commit-Position: refs/heads/master@{#498418}

TBR=fukino@chromium.org,oka@chromium.org,mariannet@google.com

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

Bug:  752389 
Change-Id: I79da44e2772b64fef59bdb1b6d1905fb4fb26999
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Reviewed-on: https://chromium-review.googlesource.com/657458
Reviewed-by: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Commit-Queue: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#500573}(cherry picked from commit 0c2197b56fc84a027edb276958201cef7d0952a8)
Reviewed-on: https://chromium-review.googlesource.com/659639
Reviewed-by: Naoki Fukino <fukino@chromium.org>
Cr-Commit-Position: refs/branch-heads/3202@{#117}
Cr-Branched-From: fa6a5d87adff761bc16afc5498c3f5944c1daa68-refs/heads/master@{#499098}
[modify] https://crrev.com/ae3d372b13143030f8e0e5284d812ae9a6df6709/ui/file_manager/file_manager/foreground/js/ui/file_table.js

9901.54.0, 62.0.3202.74