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chromium/third_party/blink/web_tests/paint/invalidation/video-paint-invalidation.html 

<!DOCTYPE html>
<script src="resources/text-based-repaint.js"></script>
<script src="../../media/media-controls.js"></script>
<video id="video" controls></video>
<script>
if (window.testRunner)
    testRunner.waitUntilDone();

var video = document.getElementById("video");
enableTestMode(video);
var done = false;
var listener = document.addEventListener("canplaythrough", function() {
    if (done)
        return;
    done = true;
    video.currentTime = video.duration;
    runRepaintTest();
}, true);

function repaintTest() {
    video.play();
}

video.src = "../../media/content/test-25fps.ogv";
</script>