notifyAskPermission_ method
Implementation
void notifyAskPermission_(
String url, WinWebViewPermissionResourceType kind, int deferralId) {
if (_onPermissionRequest != null) {
var req = WinWebViewPermissionRequest._(this, deferralId, url, kind);
_onPermissionRequest!(req);
} else {
// if user not listen to permission request, always deny
grantPermission(deferralId, false);
}
}