UserAgent: Mozilla/5.0 (X11; CrOS x86_64 11021.81.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36
Platform: 11021.81.0 (Official Build) stable-channel eve

Steps to reproduce the problem:
1.Open app tray on Google Pixel book, swipe up to second page of apps
2. Screen flashes during transition

What is the expected behavior?

What went wrong?
App tray brightens during transition to second page of apps

Did this work before? N/A 

Chrome version: 70.0.3538.110  Channel: n/a
OS Version: 11021.81.0
Flash Version: 31.0.0.148