Convert track-webvtt-tc[019-021] tests to testharness.js

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

Index: third_party/WebKit/LayoutTests/media/track/track-helpers.js
diff --git a/third_party/WebKit/LayoutTests/media/track/track-helpers.js b/third_party/WebKit/LayoutTests/media/track/track-helpers.js
index 0e5db69461f06b2ae6e8442795cb30ee5599718f..c8ee628dedb02ab781a0773ca65aaba140a590a1 100644
--- a/third_party/WebKit/LayoutTests/media/track/track-helpers.js
+++ b/third_party/WebKit/LayoutTests/media/track/track-helpers.js
@@ -16,12 +16,26 @@ function assert_cues_equal(cues, expected) {
     }
 }
 
-function assert_cues_match(cues, expected, properties) {
+function assert_cues_match(cues, expected) {
     assert_equals(cues.length, expected.length);
     for (var i = 0; i < cues.length; i++) {
         var cue = cues[i];
         var expectedItem = expected[i];
-        for (var property of properties)
+        for (var property of Object.getOwnPropertyNames(expectedItem))
             assert_equals(cue[property], expectedItem[property]);
     }
+}
+
+function check_cues_from_track(src, func) {
+    async_test(function(t) {
+        var video = document.createElement("video");
+        var trackElement = document.createElement("track");
+        trackElement.src = src;
+        trackElement.default = true;
+        video.appendChild(trackElement);
+
+        trackElement.onload = t.step_func_done(function() {
+            func(trackElement.track);
+        });
+    }, "Check cues from " + src);
 }