Chrome Version: <From about:version: Google Chrome  54.0.2840.59 beta>
<b>Chrome OS Version: <From about:version: Platform x.x.x.x></b>
Chrome OS Platform: Pixel 2
Network info: N/A

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

Steps To Reproduce:
(1) Plug in external monitor and set to extend desktop
(2) arrange some windows on external monitor
(3) Unplug external monitor
(4) Replug external monitor

Expected Result: Windows come back to the same place they were on my external monitor

Actual Result: Windows are in random places.

How frequently does this problem reproduce? Always

What is the impact to the user, and is there a workaround? If so, what is
it?
Impact: have to relayout my windows every time I plug in my external monitor
Workaround: none

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