UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36

Steps to reproduce the problem:
- go to https://files.unity3d.com/marcot/mouse-input-bug/
- open the log to see the mouse movementX/Y values
- click on the canvas to lock the cursor
- continuously move to right (or left)

What is the expected behavior?
smooth movement / no jumps

What went wrong?
sometimes you will see (in the log) movementX/Y values in the range of hundreds instead of much lower -20/20

Did this work before? No 

Does this work in other browsers? Yes

Chrome version: 63.0.3239.132  Channel: stable
OS Version: 10.0
Flash Version: 

- seems similar to https://bugs.chromium.org/p/chromium/issues/detail?id=701970 but it's reproducible without using mouse wheel
- only reproducible on Windows
- works fine in other browsers