I'm using Note 4 without the Samsung VR headset (like a regular phone) to test your demo VR scene , but EnterVR button is not displayed. I tried some hacks in webvr.xml to display the button but in the end toggleVR() and enterVR() just does not work on Note 4 in Chrome.
Works in Firefox and built-in Android browser on Note 4.
Works in Chrome with almost any other Android phone!
What can I do?
(ismobilevr returns false on Note 4, even with fake mode on.)