Convert track-webvtt-tc[024-026] 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 a377ae0628c054457dfd5bb0b4ea884d6ced089a..12e8aff7354523530d3a05289bb7a7b5b587fc42 100644
--- a/third_party/WebKit/LayoutTests/media/track/track-helpers.js
+++ b/third_party/WebKit/LayoutTests/media/track/track-helpers.js
@@ -45,6 +45,11 @@ function assert_cue_fragment(cue, children) {
     assert_true(fragment.isEqualNode(cue.getCueAsHTML()));
 }
 
+function assert_cue_fragment_as_textcontent(cue, children) {
+    var fragment = createFragment(children);
+    assert_equals(cue.getCueAsHTML().textContent, fragment.textContent);
+}
+
 function createFragment(children) {
     var fragment = document.createDocumentFragment();
     cloneChildrenToFragment(fragment, children);
@@ -58,6 +63,9 @@ function cloneChildrenToFragment(root, children) {
             childElement = document.createTextNode(child.value);
         } else {
             childElement = document.createElement(child.type);
+            var styles = child.style || {};
+            for (var attr of Object.getOwnPropertyNames(styles))
+                childElement[attr] = styles[attr];
             cloneChildrenToFragment(childElement, child.value);
         }
         root.appendChild(childElement);