Chrome Version: 72.0.3595.2 (Official Build) Revision 4af8b5a14fa87ad1e81fa9ae20c30f9a8c1494cb-refs/branch-heads/3595@{#4} (32/64-bit)

OS: Windows (7, 8, 8.1, 10)

What steps will reproduce the problem?
(1) Launch chrome and visit any page that has scrollbar.
(2) Click middle wheel of mouse to auto-scroll the page and don't move the mouse after the click (auto-scroll symbol should appear).
(2) Now scroll the page using mouse wheel from that position.
(3) Observe.

Actual Result: Page scrolls using mouse wheel at first instance when the page is in auto-scroll mode.

Expected Result: Page should never scroll using mouse wheel when the page is in auto-scroll mode.

This is a Regression issue seen from 'M-71' and below is the manual regression range:
Good Build: 71.0.3555.0 (Revision: 591861)
Bad Build:  71.0.3556.0 (Revision: 592301)

[Unable to provide bisect using 1) Per-revision script as "[Errno 2] No such file or directory" error message is thrown and
				2) Chromium bisect script as "File is not a zip file" error message is thrown.
Hence, providing suspect manually.)

CHANGE-LOG URL:

https://chromium.googlesource.com/chromium/src/+log/71.0.3555.0..71.0.3556.0?pretty=fuller&n=10000

Suspecting: r592217 ??

@sahel: Could you please check whether this is caused with respect to your change, if not please help us in assigning it to the right owner.

NOTE:
1) Issue is also seen on M-71 Beta (build #71.0.3578.20) and M-72 Canary (build #72.0.3596.0).
2) Issue is not seen on Mac (10.13.1, 10.13.6, 10.14.1) and Linux (14.04 LTS).

Please refer the attached screen-cast.

Thank You..!!
 

Deleted: Actual Video.mp4 4.3 MB

	Actual Video.mp4 4.3 MB View Download

Deleted: Expected Video.mp4 766 KB

	Expected Video.mp4 766 KB View Download