Chrome Version: 70.0.3510.2 (Official Build) Revision 19bbe7b51081dd5aca29d10d5f881cce7eb95ff8-refs/branch-heads/3510@{#4} (32/64-bit)
OS: Windows (7, 8, 8.1, 10) and Mac(10.12.6, 10.13.1, 10.14, 10.13.6).

Pre-condition: Enable 'Enable using Google Local NTP' and 'New Tab Page Background Selection' under 'chrome://flags'.

What steps will reproduce the problem?
1. Launch Chrome, open NTP, click on Gear icon in bottom RHS of page and observe.

Actual Result  : Focus ring does not appear on gear icon on mouse click.
Expected Result: Focus ring should appear on gear icon on mouse click.

This is a regression issue, broken in 'M-70', and below is  per-revision bisect-info:
Good Build:70.0.3503.0(Revision: 578160)
Bad Build :70.0.3504.0(Revision: 578510)

You are probably looking for a change made after 578169 (known good), but no later than 578170 (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/7637ae87b8e8ef651fdcd15e8ace6da78053e6b0..b315c20043e0a5ad29ed29ce7d47aaba043b8204

Suspect: https://chromium.googlesource.com/chromium/src/+/b315c20043e0a5ad29ed29ce7d47aaba043b8204

@kmilka: 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: Gear icon is not present in Linux (14.04 LTS) OS.

Kindly review the attached screen-cast for reference from the drive. (https://drive.google.com/open?id=182XAEGKiwOVuirVy7U6DMQY65U4R0o_7)

Thank you..!!