Chrome Version:  52.0.2743.32 beta (64-bit)
Chrome OS Version: 8350.21.1 (Official Build) beta-channel samus
Chrome OS Platform:  Google_Samus.6300.174.0 - Chromebook pixel

Please specify Cr-* of the system to which this bug/feature applies (add
the label below). CrOS x86_64 8350.21.1

Steps To Reproduce:
(1) Update to ChromeOS 53 on beta channel
(2) Use a scaled resolution instead of native
(3) Install crouton ( probably there are others but this one is failing for me) 
(4) Launch the extension
(5) Open any app and drag it around

Expected Result:
Windows moves as it should within the extension window

Actual Result:
Rendering problems on 3/4 of the screen

How frequently does this problem reproduce? (Always, sometimes, hard to
reproduce?)
Always happens, goes away if you use the native reoslution

What is the impact to the user, and is there a workaround? If so, what is
it?

Always have to have a screen plugged in or use native screen resolution

Please provide any additional information below. Attach a screen shot or
log if possible.

This also happened on ChromeOS 50 and was fixed/reverted a few days later.