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chromium/content/test/data/gpu/webgl-domain-blocking-page1.html 

<html>
<head>
<script type="text/javascript">
var gl;
var restored;
var numLosses = 0;

function init()
{
  var canvas = document.getElementById('c');
  canvas.addEventListener('webglcontextlost', function(e) {
    e.preventDefault();
    restored = false;
    ++numLosses;
    // This bakes in knowledge that GpuDataManagerImplPrivate blocks
    // WebGL contexts from restoration after two context losses on the
    // same domain.
    if (numLosses == 2) {
      window.location.href = "webgl-domain-blocking-page2.html";
    }
  }, false);
  canvas.addEventListener('webglcontextrestored', function(e) {
    e.preventDefault();
    restored = true;
  }, false);
  gl = canvas.getContext('webgl');
  if (window.domAutomationController) {
    window.domAutomationController.send("LOADED");
    if (!gl) {
      window.domAutomationController.send("FAILED");
    }
  }
}
</script>
</head>
<body bgcolor="lightgray" onload="init()">
<canvas id="c" width="400" height="300" style="border-width: 1px; border-style: solid;"></canvas>
</body>
</html>