Version: 54.0.2840.41 (Official Build) aeb8895aa4becddb1526af10d1e67495713b6c1a-refs/branch-heads/2840@{#557} (64-bit)
OS: Mac (10.10.5, 10.11.5)

What steps will reproduce the problem?
1) Launch chrome, go to chrome://chrome-urls, press Cmd+Ctrl+F and then press Cmd+Shift+F.
2) Mouse hover on top (tabstrip appears), click on wrench menu and select Exit fullscreen option.
3) Observe the top R.H.S of screen while browser exits Fullscreen mode.

Blink of scrollbar is seen while exiting Fullscreen mode.

No such blink should be seen while exiting Fullscreen mode.
 
This is a Regression issue broken in M-50, below is the bisect info
Manual bisect:
Good build: 50.0.2640.0
Bad build: 50.0.2641.0

Narrow bisect URL:
https://chromium.googlesource.com/chromium/src/+log/b6bd151a94c2206449de57c6167c6bf17cc40b6f..b725a602e2cdd76ce60f483b138763404bb1b354?pretty=fuller&n=10000

Suspecting: r373695

Note: Issue is not seen on Windows and Linux OS.


 

Deleted: fullscreen_actual.mov 3.9 MB

fullscreen_actual.mov 3.9 MB Download

Deleted: fullscreen_expected.mov 3.9 MB

fullscreen_expected.mov 3.9 MB Download