UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.79 Safari/537.36

Steps to reproduce the problem:
1. We have a kiosk application that we've built on ChromeOS.  Out Kiosk application has an angular2 keyboard we designed
2. When we go to type on a field, the chromeOS virtual keyboard keeps popping up on top of the screen so we can't use our custom angular2 keyboard
3.

What is the expected behavior?
The expected behavior is that the ChromeOS keyboard doesn't pop up and is permanently disabled.

What went wrong?
We followed the following documentation.
https://developer.chrome.com/apps/accessibilityFeatures

and it doesn't seem to be working for us.

Did this work before? No 

Does this work in other browsers? N/A

Chrome version: 61.0.3163.79  Channel: stable
OS Version: 60.0.3112.114
Flash Version: 

Since its not working, we not sure if we're doing something wrong on our end. 

Please advise.  Thank you.