Chrome Version: 71.0.3548.0 (Official Build) Revision 94235d806bd7d3be1608cd07bf5118d2cb3f3187-refs/branch-heads/3548@{#1} (64-bit)

OS: Mac (10.12.6, 10.13.1, 10.13.6, 10.14), Win (7, 8, 8.1, 10) & Linux (14.04 LTS)

Pre-condition:
1) Enable the flag 'Enable using the Google local NTP' and 'New Tab Page Custom Links' from chrome://flags/
2) NTP should have Scroll bar or resize the browser such that scroll bar appears on NTP.

What steps will reproduce the problem?
(1) Launch chrome and open NTP.
(2) Click on 'Add shortcut' (Overlay will get open).
(3) Now try to scroll the background NTP and Observe.

Actual Result: Unnecessary background NTP scrolls even when 'Add shortcut' overlay is open.

Expected Result: Background NTP should not scroll when 'Add shortcut' overlay is open.

This is a Regression issue seen from 'M-70' and providing the bisect info below:
Good Build: 70.0.3514.0 (Revision: 580791)
Bad Build:  70.0.3515.0 (Revision: 581084)

You are probably looking for a change made after 580948 (known good), but no later than 580949 (first known bad).

CHANGE-LOG URL:

The script might not always return single CL as suspect as some perf builds might get missing due to failure.

https://chromium.googlesource.com/chromium/src/+log/631ac11aae294abc8b5a100a09e59af59aa6e229..c2111e0695751dcd6833f86930ea7905daef9494

Suspect: https://chromium.googlesource.com/chromium/src/+/c2111e0695751dcd6833f86930ea7905daef9494

@kristipark: 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: Issue is also seen on M-70 Dev (version #70.0.3538.9).

Please refer the attached screen-cast.

Thank You..!!

 

Deleted: Actual Video.mov 4.6 MB

	Actual Video.mov 4.6 MB View Download

Deleted: Expected Video.mov 4.2 MB

	Expected Video.mov 4.2 MB View Download