This bug is occurring most notably on the Netflix site.
When viewing a widescreen video in the window, white bars are on either side of it, where there should be black.  In fullscreen mode, where there should be black bars (to give it a theater feel, and to accommodate the larger video dimensions), there are white bars.

This also happens on the chrome://settings/privacy page, where I think there should be a grey background all the way, but there is a white block in the very middle.

If you need images, I would be glad to supply them.  Also, I am using Canary, but it is the same in the google chrome dev app.