Chrome Version: 66.0.3356.0
OS: Android

Reproduction steps:

1. Clear Chrome settings:
      Go to Android settings -> Apps -> Chrome -> Storage -> Manage space -> Clear All Data
2. Enable permissions for Chrome, go to:
      Go to Android settings -> apps -> Chrome -> Permissions:
	- enable Storage permission
	- enable Location permission
	- enable Camera permission
	- enable Microphone permission
3. Open Chrome, complete First Run Experience
4. Open chrome://flags and enable required flags:
	#vr-browsing-native-android-ui
	#vr-web-input-editing
   Relaunch Chrome
5. Access https://permission.site/ on the test device. 
6. Enter Chrome VR
7. Click “Auto Download” button


What is the expected result?
- Permission prompt appears in Chrome VR

What happens instead?
- Permission prompt is absent, button color remains unchanged