<!DOCTYPE html>

<html>
<head>
    <style>
        body {
            height: 5000px;
        }
    </style>
    <script>
        if (window.testRunner) {
            testRunner.dumpAsText();
            testRunner.waitUntilDone();
        }

        function dumpTiles()
        {
            if (window.internals) {
                document.getElementById('layers').innerText = internals.layerTreeAsText(document,
                    internals.LAYER_TREE_INCLUDES_VISIBLE_RECTS | internals.LAYER_TREE_INCLUDES_TILE_CACHES);
            }
            if (window.testRunner)
                testRunner.notifyDone();
        }
        function doTest()
        {
            window.scrollTo(0, 3000);
            setTimeout(dumpTiles, 500);
        }
        window.addEventListener('load', doTest, false);
    </script>
</head>
<body>
<pre id="layers">Layer tree goes here</p>
</body>
</html>