android_webview/test/shell/assets/webvr_not_functional_test.html - chromium/src - Git at Google

 <!DOCTYPE html>
 <script>
 var promiseResolved = false;
 var numDisplays = -1;
 navigator.getVRDisplays().then( (displays) => {
   numDisplays = displays.length;
 }).then( () => {
   promiseResolved = true;
 });
 </script>
	<!DOCTYPE html>
	<script>
	var promiseResolved = false;
	var numDisplays = -1;
	navigator.getVRDisplays().then( (displays) => {
	numDisplays = displays.length;
	}).then( () => {
	promiseResolved = true;
	});
	</script>