UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36

Steps to reproduce the problem:
1. On Microsoft Surface Pro 4, in Windows 10, on Chromium 55 up to 58
2. Go to https://patrickhlauke.github.io/touch/pen-tracker/
3. Pen pressure will result in 0.5 if down, 0 if not.

ALSO does not work with attached Wacom tablet (Tried after the fact)

What is the expected behavior?
Expected behavior is that pressure is returned properly: 0-1 float

What went wrong?
Pressure does work on Mac OS, so I believe the piping isnt being passed through on Windows, but I don't know for sure.

Did this work before? No 

Does this work in other browsers? No
 Pointer Events when pointerType is 'pen' correctly results in event.pressure being set properly in Windows 10 in Edge. 

Chrome version: 55.0.2883.87  Channel: stable
OS Version: 10.0
Flash Version: Shockwave Flash 24.0 r0

I was very excited to get a Microsoft Surface and start developing a pen app for it in Chromium. I had assumed given the Surface popularity, pen support would be better on Windows than Mac. Please let me know what I can do to help fix the issue. I will be extremely thankful and you will have my eternal gratitude. I will also be your best friend! I have a contact at Microsoft if you need it. Thanks!!!!!