Chrome version : 66.0.3359.139 (Official Build) a020eddf0d85fe84d4a6787b304f50aafb670969-refs/branch-heads/3359@{#767} (32/64 bit)

OS : Win(7,8,8.1,10) and Linux(14.04 LTS) OS

Pre-condition: Enabled 'Enable Material Design extensions' flag from chrome://flags.

Steps to reproduce:
1.Launch Chrome and navigate to 'chrome://extensions/' page.
2.Now resize browser window to L.H.S and scroll scroll bar using mouse
3.Observe content on extension card.

Actual Result : Scrollbar is not working properly(i.e on resizing browser window content on extension card is seen chopped ) on      'chrome://extensions/' page.
Expected Result : After resizing browser window,all content on chrome://extension  page should be seen on scrolling .

This is a regression issue broken in ‘M-63’ and using the per-revision bisect providing the bisect results,
Good build: 63.0.3236.0 (Revision : 507287)
Bad build: 63.0.3237.7  (Revision : 507841)

You are probably looking for a change made after 507485 (known good), but no later than 507486 (first known bad).
CHANGELOG 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/5229d3bfdeaafa903611d37ac1264063336fb42f..e23302a784a208b27c10bd6369278ff8fc908720

Suspect: https://chromium.googlesource.com/chromium/src/+/e23302a784a208b27c10bd6369278ff8fc908720 

@scottchen: Could you please look into the issue, pardon me if it has nothing to do with your changes and if possible please assign it to concern owner.

Note : Issue is not reproducible on  Mac(10.12.6,10.13.1,10.13.5) OS

Thank you.
 

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	Actual_result.mp4 1.1 MB View Download

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	Expected_result.mp4 921 KB View Download