What steps will reproduce the problem?
(1) Use the Pixel Slate with its keyboard and trackpad for a while
(2) Use a Linux or Android app and put Chrome "above" it
(3) Notice that scrolling inside of Chrome will sometimes cause a black flicker as if the content of the Linux/Android app is showing through

What is the expected output?
Web content should be displayed without any flickering.

What do you see instead?
There's some noticeable black flickering happening when scrolling on websites in Chrome.

Please provide any additional information below.
This happens when Android or Linux apps are behind the Chrome window. It's relatively easy to reproduce. I can provide a video on request.

I'm on the latest available Chrome OS version for the Slate. 


Google Chrome	71.0.3578.94 (Official Build) (64-bit)
Revision	6da2ba233559398092dabd8dc7bc8e78cd758307-refs/branch-heads/3578@{#890}
Platform	11151.59.0 (Official Build) stable-channel nocturne
Firmware Version	Google_Nocturne.10984.67.0