Convert track-webvtt-tc[016-018] tests to testharness.js

third_party/WebKit/LayoutTests/media/track/track-helpers.js

 function enableAllTextTracks(textTracks) {
     for (var i = 0; i < textTracks.length; i++) {
         var track = textTracks[i];
         if (track.mode == "disabled")
             track.mode = "hidden";
     }
 }
 
 function assert_cues_equal(cues, expected) {
     assert_equals(cues.length, expected.length);
     for (var i = 0; i < cues.length; i++) {
         assert_equals(cues[i].id, expected[i].id);
         assert_equals(cues[i].startTime, expected[i].startTime);
         assert_equals(cues[i].endTime, expected[i].endTime);
         assert_equals(cues[i].text, expected[i].text);
     }
+}
+
+function assert_cues_match(cues, expected, properties) {
+    assert_equals(cues.length, expected.length);
+    for (var i = 0; i < cues.length; i++)
+        for (var property of properties)
+            assert_equals(cues[property], expected[property]);

[fs, 2016/05/26 12:18:22]

This needs to index in cues too. I'd suggest loading the current cue into a
local before the inner loop and then use that (inside the inner loop.)

[Srirama, 2016/05/26 13:34:50]

Done.

 }