Chrome Version:  73.0.3644.0/11480.0.0 dev channel Quawks,Minnie,Peach-pit
OS: Chrome

What steps will reproduce the problem?
(1)Sign into User -> Now go to new Tab or any white background screen and 
press 'Ctrl+F5(Overview Mode Button)' for screenshot -> go to Files App
2)Now select that Screenshot and right click on it for context menu and select 'Gallery' ->  Gallery should be in minimized mode and click on 'Slideshow' button
3)Now observe 'Next' and 'Previous' buttons are not seen properly in white background i.e. unable to distinguish between buttons and screen
(Please refer Video and Screenshot)

Expected: 'Next' and 'Previous' buttons should be seen properly even in white background i.e. unable to distinguish between buttons and screen
Actual: Instead 'Next' and 'Previous' buttons are not seen properly i.e. unable to distinguish between buttons and screen

This is Non-Regression Issue seen from M-62
 

Deleted: Actual_Buttons.mp4 15.6 MB

Actual_Buttons.mp4 15.6 MB Download

Deleted: Actual_Buttons.jpg 441 KB

	Actual_Buttons.jpg 441 KB View Download