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

third_party/WebKit/LayoutTests/media/video-controls-zoomed.html

Index: third_party/WebKit/LayoutTests/media/video-controls-zoomed.html
diff --git a/third_party/WebKit/LayoutTests/media/video-controls-zoomed.html b/third_party/WebKit/LayoutTests/media/video-controls-zoomed.html
index c0dfbe49af692561773bbcd30022984bc6713d97..7717babe891a5ea1d77c371f8c9329579627e15e 100644
--- a/third_party/WebKit/LayoutTests/media/video-controls-zoomed.html
+++ b/third_party/WebKit/LayoutTests/media/video-controls-zoomed.html
@@ -49,6 +49,8 @@
     <video controls></video>
     <p>Test controls on zoomed video.</p>
     <p>This test only runs in DRT!</p>
+    <!-- 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.controls", null, '!=');
@@ -59,5 +61,3 @@
     </script>
 </body>
 </html>
-
-