UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36

Steps to reproduce the problem:
1. e.g. use html5gamepad.com
2. check dpad (works)
3. check shape buttons (are on/off)

What is the expected behavior?
getting a float [0.00 - 1.00] on the shape buttons

What went wrong?
got a binary on/off

Did this work before? N/A 

Does this work in other browsers? N/A

Chrome version: 53.0.2785.116  Channel: stable
OS Version: 3.13.0-96-generic
Flash Version: 

The code in question seems to be here: https://chromium.googlesource.com/chromium/src/+/master/device/gamepad/gamepad_standard_mappings_linux.cc#59