Convert track-webvtt-tc[000-002] 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) {

[mlamouri (slow - plz ping), 2016/05/19 11:40:31]

Can you change `expected` to be an array of Object instead of an Object
containing arrays?

so you could write:
```
for (var i = 0; i < cues.length; ++i) {
  assert_equals(cues[i].id, expected[i].id);
  [...]
}
```

[Srirama, 2016/05/19 13:59:36]

Done.

+    for (var i = 0; i < cues.length; i++) {
+        assert_equals(cues[i].id, expected.idValues[i]);
+        assert_equals(cues[i].startTime, expected.startTimeValues[i]);
+        assert_equals(cues[i].endTime, expected.endTimeValues[i]);
+        assert_equals(cues[i].text, expected.textValues[i]);
+    }
+}