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chromium/third_party/blink/web_tests/http/tests/permissionclient/image-permissions.html 

<!DOCTYPE html>
<script src="/js-test-resources/js-test.js"></script>
<body>
<script>
description("This test checks that all URLs in a redirect chain are passed to the PermissionClient.");
window.jsTestIsAsync = true;

if (window.testRunner)
    testRunner.dumpPermissionClientCallbacks();

var img = new Image();
img.src = "http://127.0.0.1:8000/permissionclient/resources/redir.php?url=http://127.0.0.1:8000/permissionclient/resources/boston.gif";
img.onerror = function() { testFailed('error event for image'); finishJSTest(); };
img.onload = function() { finishJSTest(); }; 
document.body.appendChild(img);
</script>