Add TODOs to convert from video-test.js to testharness.js

third_party/WebKit/LayoutTests/media/video-volume.html

Index: third_party/WebKit/LayoutTests/media/video-volume.html
diff --git a/third_party/WebKit/LayoutTests/media/video-volume.html b/third_party/WebKit/LayoutTests/media/video-volume.html
index 82e6937c71fc63e08d6a73a991c829de7843c3fe..c63b81ba3cccffbd86c2455df62c0a7884257ce6 100644
--- a/third_party/WebKit/LayoutTests/media/video-volume.html
+++ b/third_party/WebKit/LayoutTests/media/video-volume.html
@@ -1,6 +1,8 @@
 <video controls></video>
 <p>Test 'volume' attribute<p>
 <script src=media-file.js></script>
+<!-- TODO(philipj): Convert test to testharness.js. crbug.com/588956
+     (Please avoid writing new tests using video-test.js) -->
 <script src=video-test.js></script>
 <script>
     testExpected("video.volume", 1.0);
@@ -24,5 +26,5 @@
         testDOMException("video.volume = 1.5", "DOMException.INDEX_SIZE_ERR");
         testDOMException("video.volume = -0.5", "DOMException.INDEX_SIZE_ERR");
         endTest();
-    }); 
+    });
 </script>