third_party/WebKit/LayoutTests/images/dispose-previous.html

<link rel="match" href="dispose-previous-expected.html"/>
<img id="apng" src=resources/crbug722072.png />
<script>
if (window.testRunner) {
  window.onload = function() {
    testRunner.waitUntilDone();

    // Jump to the final frame.
    for (var i = 0; i < 3; i++)
      window.internals.advanceImageAnimation(apng);

    requestAnimationFrame(function() {
      testRunner.notifyDone();
    });
  }
}
</script>