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chromium/third_party/blink/web_tests/media/controls/playback-speed-menu.html 

<!DOCTYPE html>
<title>Test that we can display a playback speeds list menu and set playback rate from the list.</title>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../media-controls.js"></script>
<!-- Width should be large enough to display playback speed button. -->
<video controls style="width: 500px"></video>
<script>
async_test(function(t) {
  var video = document.querySelector("video");
  video.src = '../content/test.ogv';

  enableTestMode(video);

  video.onloadeddata = t.step_func(function() {
    assert_true(isPlaybackSpeedButtonEnabled(video));
    assert_equals(video.defaultPlaybackRate, 1);
    assert_equals(video.playbackRate, 1);

    clickPlaybackSpeedAtPlaybackRate(video, 0.25, t.step_func(function() {
      assert_equals(video.defaultPlaybackRate, 0.25);
      assert_equals(video.playbackRate, 0.25);

      clickPlaybackSpeedAtPlaybackRate(video, 0.5, t.step_func(function() {
        assert_equals(video.defaultPlaybackRate, 0.5);
        assert_equals(video.playbackRate, 0.5);

        clickPlaybackSpeedAtPlaybackRate(video, 0.75, t.step_func(function() {
          assert_equals(video.defaultPlaybackRate, 0.75);
          assert_equals(video.playbackRate, 0.75);

          clickPlaybackSpeedAtPlaybackRate(video, 1, t.step_func(function() {
            assert_equals(video.defaultPlaybackRate, 1);
            assert_equals(video.playbackRate, 1);

            clickPlaybackSpeedAtPlaybackRate(video, 1.25, t.step_func(function() {
              assert_equals(video.defaultPlaybackRate, 1.25);
              assert_equals(video.playbackRate, 1.25);

              clickPlaybackSpeedAtPlaybackRate(video, 1.5, t.step_func(function() {
                assert_equals(video.defaultPlaybackRate, 1.5);
                assert_equals(video.playbackRate, 1.5);

                clickPlaybackSpeedAtPlaybackRate(video, 1.75, t.step_func(function() {
                  assert_equals(video.defaultPlaybackRate, 1.75);
                  assert_equals(video.playbackRate, 1.75);

                  clickPlaybackSpeedAtPlaybackRate(video, 2, t.step_func_done(function() {
                    assert_equals(video.defaultPlaybackRate, 2);
                    assert_equals(video.playbackRate, 2);
                  }));
                }));
              }));
            }));
          }));
        }));
      }));
    }));
  });
});
</script>