UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36

Steps to reproduce the problem:
1. Run C:\Program Files (x86)\Google\Chrome\Application> chrome.exe --kiosk and see the browser launch in kiosk mode
2. Install our extension at https://chrome.google.com/webstore/detail/emaginepos-payments/bdmagcfhdkdmhbmgcpaopogicolehfmo?authuser=1 and close browser
3. Run C:\Program Files (x86)\Google\Chrome\Application> chrome.exe --kiosk and see the browser will no longer launch in kiosk mode.
4. Disable the extension and try again, see that it works.

What is the expected behavior?
The expected behavior is that Chrome will still launch in kiosk mode with the --kiosk flag.  

What went wrong?
We're a point of sale company that deploys our pos using Chrome in kiosk mode.  As part of our solution, I have built a Chrome extension that runs a background page.  Ever since we installed the extension, we can no longer launch Chrome in kiosk mode.  We have to manually put it in fullscreen mode which is problematic for us.

My suspicion is that our extension runs a background page https://developer.chrome.com/extensions/background_pages and this is somehow preventing kiosk mode from working.  Just having an extension installed and active doesn't seem to affect kiosk mode.  The only interesting thing about our extension is that it runs a background page.  We use only a handful of chrome apis to message between the extension and the webpage.  The rest is vanilla JS.  I can share the original, un-minified/uglified source with Google in private if it helps.  I don't want to paste it here.

Did this work before? N/A 

Chrome version: 53.0.2785.143  Channel: stable
OS Version: 6.1.7601 Service Pack 1 Build 7601
Flash Version: Shockwave Flash 23.0 r0

This is the full output about the OS:

C:\Program Files (x86)\Google\Chrome\Application>systeminfo | findstr /C:"OS"
OS Name:                   Microsoft Windows Embedded Standard
OS Version:                6.1.7601 Service Pack 1 Build 7601
OS Manufacturer:           Microsoft Corporation
OS Configuration:          Standalone Workstation
OS Build Type:             Multiprocessor Free
BIOS Version:              Dell Inc. 2.2.4, 9/4/2015

This is on a Dell Inspiron 20 touchscreen terminal.  We are a POS company and this is common hardware / deployment platform.  

Also note that I put down Chrome 54 in the description (just updated and tried it -- problem still exists), but it has been a problem for Chrome 53.x as well.