Chrome Version: 72.0.3622.0 (Official Build) 74770d660797220710701b2c66ad38390ab86d43-refs/branch-heads/3622@{#1} (32/64-bit)
OS:Mac(10.13.1 , 10.13.6 , 10.14.2), Win(7,8,8.1,10) ,Linux(14.04 LTS) OS

Pre-condition: Enable "Enable using the Google local NTP" and "New Tab Page Background Selection" under chrome://flags

Steps to reproduce:
1. Launch chrome, navigate to NTP, Click on Gear icon to open the customize this page overlay and then click on Custom backgrounds.
2. Select any selection and then press tab key to bring focus to back navigation arrow.
3. Now press space-bar key and observe.

Actual  : Page scrolls while navigating to previous page of overlay.
Expected: Page should not scroll while navigating to previous page.

This is a regression issue, broken in 'M-71', and below is the bisect info:
Good Build: 71.0.3563.0 (Revision: 594643)
Bad Build : 71.0.3564.0 (Revision: 594949)

You are probably looking for a change made after 594908 (known good), but no later than 594909 (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/b08ffb2925c84a7469e4d3a61adc202fc231c118..f6acd308d41f88690de0efc15052fd1b467e4450

Suspect: https://chromium.googlesource.com/chromium/src/+/f6acd308d41f88690de0efc15052fd1b467e4450

@Kyle : 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.

Thank You..!
 

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