Chrome Version : 53.0.2785.116 (Official Build) (64-bit)
URLs           : http://codepen.io/fearmear/pen/QKvvYV
Other browsers tested:
     Safari: OK
    Firefox: OK
         IE: OK
       Edge: OK

Steps to reproduce:
(1) Create any DOM element that can have background-image css property
(2) Set "width" and "height" to 200px for that element
(3) Set "background-image" to http://placeskull.com/100/100/bd2f2f/7/0 (any svg will do)
(4) Set "background-size" to "cover"
(5) Set "border-radius" to any value except default

Expected result:
An image fills 200x200 pixels.

Actual result:
An image increases in size to 200x200 but fills 100x100 pixels four times.

Worked correctly in 52 version of Chrome.