Chrome Version: 66.0.3359.117 (Official Build) 7f59c28e25283df88e0c6ac8d8b2551d8c6ad93b-refs/branch-heads/3359@{#723}(32/64 bit)
 
OS: Win(7,8,8.1,10) OS.

Steps to reproduce:
1.Launch chrome and navigate to 'chrome://extensions/'.
2.Resize window to L.H.S ,scroll horizontal bar and observe.

Actual Result : Unable to drag horizontal scroll bar to extreme R.H.S in 'chrome://extensions/'.
Expected Result : Should be able to drag horizontal scroll bar to extreme R.H.S in 'chrome://extensions/'.

This is Regression issue broken in 'M-64’ and Using the per-revision bisect providing the bisect results,
Good Build: 64.0.3241.0 (Revision: 508935)
Bad Build: 64.0.3242.0(Revision: 509211) 

You are probably looking for a change made after 509177 (known good), but no later than 509178 (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/1e07598189d142b6811b7616050139a97048df7f..a1a41e8571493734a8fee5373e27be8b5756d303

Suspect: https://chromium.googlesource.com/chromium/src/+/a1a41e8571493734a8fee5373e27be8b5756d303

@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 seen on Mac(10.12.6,10.13.1,10.13.5) and Linux(14.04 LTS)
Kindly refer attached screen cast

 

Deleted: Actual_result.mp4 1016 KB

	Actual_result.mp4 1016 KB View Download

Deleted: Expected_result.mp4 1.3 MB

	Expected_result.mp4 1.3 MB View Download