Chrome Version: 70.0.3526.0
Chrome OS Version: 10967.0.2018_14_1427
Chrome OS Platform: Samsung Chromebook Pro (caroline)

Steps To Reproduce:
(0) Have a test build of Chrome OS
(1) Enable remote debugging:
$ echo "--remote-debugging-port=9222" >> /etc/chrome_dev.conf
(2) open some page (empty tab is as good as any).
(3) open in another tab localhost:9222 without covering the tab under test completely (we want it to remain active) and select the test tab.
(4) Press "Ctrl+Shift+C"

Expected Result:
Hovering mouse pointer highlights an html element under the pointer.

Actual Result:
Hovering mouse pointer highlights an html element with halved coordinates relative to the upper left corner of the screencast view.

How frequently does this problem reproduce? Always

What is the impact to the user, and is there a workaround?
Bottom right of the page is inaccessible with element selection. Workaround unknown.

Screenshot would omit the mouse pointer which is the most interesting part.

The relevant thing from about:gpu is "scale=2" in display info.