Chrome Version: 66.0.3357.0 (Official Build) Revision 837639b937d3d1a084c246258ad1f460e4f0f68e-refs/heads/master@{#539659} (32/64-bit)

OS: Windows(7,8,8.1,10),MAC(10.12.6,10.13.1,10.13.4) and Linux(14.04 LTS).

Test URL:https://chrome.google.com/webstore/detail/google-arts-culture/akimgimeeoiognljlfchpbkpfbmeapkh?utm_source=chrome-ntp-icon

Steps to reproduce:
(1)Launch chrome and navigate to above URL and download the extension.
(2)Click on options and and select 'in every new tab' and enable all the options 'show apps button','show default new tab button','show top sites button'.
(3)Enable this extension in incognito. 
(4)Click on 'default new tab' visible on webpage and observe.

Actual Result:Black background is observed on google('default new tab') page in incognito.
Expected Result:Black background should not be observed on google('default new tab') page in incognito.

This is a regression issue broken in ‘M-65’ and using per-revision bisect providing the bisect results,

Good Build:65.0.3287.0(Revision:522297) 
 
Bad Build:65.0.3288.0(Revision:522666)

You are probably looking for a change made after 522427 (known good), but no later than 522428 (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/034134229bfcfe39482304614c615b826979d822..773623d293ed991e20596c4cb00e58610af5f395

Suspect:https://chromium.googlesource.com/chromium/src/+/773623d293ed991e20596c4cb00e58610af5f395

@Marc Treib : 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.This issue is not reproducible on M-65 Beta (build # 65.0.3325.106) but it is reproducible on M-66 Dev(build # 66.0.3355.0).
Please refer the attached screen-cast for your reference.

Thank You!


 

Deleted: Actual.mp4 1.2 MB

	Actual.mp4 1.2 MB View Download

Deleted: Expected.mp4 1.6 MB

	Expected.mp4 1.6 MB View Download