Chrome Version : 72.0.3609.3 (Official Build) 7e51571a56ab79bbd1683dc2245b031e32126ec3-refs/branch-heads/3609@{#4} 64 bit
OS : Mac(10.13.6, 10.13.1, 10.14.2)

What steps will reproduce the problem?
1. Launch chrome, open two NTPs and open Print Preview in second NTP.
2. Now, try to drag the second NTP slightly downwards. (Kindly review an attached screencast)
3. Observe the current tab while dragging.

Actual Result : Flickering of tabs is seen while detaching a tab with print preview window opened.

Expected Result : Tabs should not flicker while detaching a current tab.

This is a regression issue broken in M-72 and below is the bisect information:
Good Build : 72.0.3608.4 (Revision : 607124)
Bad Build : 72.0.3609.3 (Revision : 607406)

Chromium bisect URL:
https://chromium.googlesource.com/chromium/src/+log/a8c2d37b39b145d0db98727abdd50280c3c10813..1d9fadb68d4d71aa3d9539cf16dbc8c7fb98c095

Suspecting : r607230 or r607224 ?

lgrey@ : 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. Unable to reproduce issue in Windows (7,8,10) and Linux(14.04 LTS) OS.
2. Bisecting with 'per-revision' script shows an error "We don't have enough builds to bisect", hence provided suspect through Chromium bisect.

Thank you..!
 

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	Actual_Result_1.mov 6.6 MB View Download

Deleted: Expected_Result.mov 5.6 MB

	Expected_Result.mov 5.6 MB View Download