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chromium/content/test/data/android/auto_downloads_permissions.html 

<html>
This page triggers two file downloads.
<script>
    var count = 0;
function triggerDownload() {
    var a = document.createElement('a');
    a.download = "test-image" + count + ".png";
    count++;
    a.href = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAICAYAAADED76LAAABC0lEQVQYlTXPPUsCYQDA8b/e04tdQR5ZBpE3NAR6S0SDVDZKDQ2BY9TUy1foE0TQ1Edo6hOEkyUG0QuBRtQgl0hnenVdnZD5eLbU7xv8Avy5X16KhrQBg47EtpziXO6qBhAEeNEm0qr7VdBcLxt2mlnNbhVu0NMAgdj1wvjOoX2xdSt0L7MGgx2GGid8yLrJvJMUkbKfOF8N68bUIqcz2wQR7GUcYvJIr1dFQijvkh89xGV6BPPMwvMF/nQXJMgWiM+KLPX2tc0HNa/HUxDv2owpx7xV+023Hiwpdt7yhmcjj9/NdrIhn8LrPVmotctWVd01Nt27wH9T3YhHU5O+sT/6SuVZKa4cNGoAv/ZMas7pC/KaAAAAAElFTkSuQmCC";
    a.click();
}

triggerDownload();
triggerDownload();
</script>
</html>