Deflake media/track/media-element-move-to-new-document-assert.html

third_party/WebKit/LayoutTests/media/track/media-element-move-to-new-document-assert.html

Index: third_party/WebKit/LayoutTests/media/track/media-element-move-to-new-document-assert.html
diff --git a/third_party/WebKit/LayoutTests/media/track/media-element-move-to-new-document-assert.html b/third_party/WebKit/LayoutTests/media/track/media-element-move-to-new-document-assert.html
index ccaa218c43255b7d966b5148228fdc497e6b1795..13c2f6e60a202a86c02fec588a6c5e1be7777b47 100644
--- a/third_party/WebKit/LayoutTests/media/track/media-element-move-to-new-document-assert.html
+++ b/third_party/WebKit/LayoutTests/media/track/media-element-move-to-new-document-assert.html
@@ -4,19 +4,25 @@ video with text track between documents.</p>
 <video></video>
 <iframe></iframe>
 <script>
-if (window.testRunner)
+if (window.testRunner) {
   testRunner.dumpAsText();
+  testRunner.waitUntilDone();
+}
 
-var video = document.querySelector("video");
-var track = document.createElement("track");
+window.onload = function () {
+    var video = document.querySelector("video");
+    var track = document.createElement("track");
 
-// Note: The order of setting the text track mode and appending the
-// track element is important, in terms of implementation and spec:
-// https://www.w3.org/Bugs/Public/show_bug.cgi?id=28973
-track.track.mode = "showing";
-video.appendChild(track);
+    // Note: The order of setting the text track mode and appending the
+    // track element is important, in terms of implementation and spec:
+    // https://www.w3.org/Bugs/Public/show_bug.cgi?id=28973
+    track.track.mode = "showing";
+    video.appendChild(track);
 
-// Move the video element to another document.
-var iframe = document.querySelector("iframe");
-iframe.contentDocument.body.appendChild(video);
+    // Move the video element to another document.
+    var iframe = document.querySelector("iframe");
+    iframe.contentDocument.body.appendChild(video);
+    if (window.testRunner)
+        testRunner.notifyDone();
+};
 </script>