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<html>
<head>
    <script>
        if (window.testRunner) {
            testRunner.dumpAsText();

            if (window.internals)
                internals.setViewExposedRect(0, 1025, 800, 200);

            testRunner.setViewSize(800, 2500);
            testRunner.waitUntilDone();
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                    document.getElementById('layers').innerText = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_TILE_CACHES);
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                    testRunner.notifyDone();
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    </script>
</head>
<body>
<pre id="layers">Layer tree goes here</p>
</body>
</html>