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chromium/chrome/test/data/android/url_overriding/navigation_from_long_timeout.html 

<!DOCTYPE html>
<html>
<head>
  <meta name="viewport"
    content="width=device-width, initial-scale=1.0, maximum-scale=1.0" />
  <script>
    function waitAndOpenApp() {
      interval = window.setInterval(function () {
        if (!navigator.userActivation.isActive) {
          clearInterval(interval);
          window.location.replace(
            'intent://test/#Intent;scheme=externalappscheme;end');
        }
      }, 200);
    };
  </script>
</head>
<body style='height:10000px;' onclick='waitAndOpenApp();'>
  Click page to open App!!
</body>
</html>