WebVTT: Update cue alignment to a later spec. version

LayoutTests/media/track/track-cue-rendering-position-auto-rtl.html

Index: LayoutTests/media/track/track-cue-rendering-position-auto-rtl.html
diff --git a/LayoutTests/media/track/track-cue-rendering-position-auto.html b/LayoutTests/media/track/track-cue-rendering-position-auto-rtl.html
similarity index 69%
copy from LayoutTests/media/track/track-cue-rendering-position-auto.html
copy to LayoutTests/media/track/track-cue-rendering-position-auto-rtl.html
index ddf9422ffb451054a64b991ed0544c6255f5ad6a..10c433f33c844af42fc24cb4a65c9370aac2982d 100644
--- a/LayoutTests/media/track/track-cue-rendering-position-auto.html
+++ b/LayoutTests/media/track/track-cue-rendering-position-auto-rtl.html
@@ -3,9 +3,9 @@
 <script>
 var mediaFile = findMediaFile('video', '../content/test');
 
-function addTrackWithCueData(video, cueData) {
+function addTrackWithRtlCueData(video, cueData) {
   var track = video.addTextTrack('subtitles');
-  var cue = new VTTCue(0, 10, 'XXX');
+  var cue = new VTTCue(0, 10, '\u05d0\u05d1\u05d2');
   for (var prop in cueData)
     cue[prop] = cueData[prop];
   track.addCue(cue);
@@ -22,21 +22,21 @@ video::cue {
 <video>
   <script>
   var video = document.currentScript.parentNode;
-  addTrackWithCueData(video, { align: 'start', line: 0 });
+  addTrackWithRtlCueData(video, { align: 'start', size: 50, line: 0 });
   video.src = mediaFile;
   </script>
 </video>
 <video>
   <script>
   var video = document.currentScript.parentNode;
-  addTrackWithCueData(video, { align: 'middle', line: 0 });
+  addTrackWithRtlCueData(video, { align: 'middle', size: 50, line: 0 });
   video.src = mediaFile;
   </script>
 </video>
 <video>
   <script>
   var video = document.currentScript.parentNode;
-  addTrackWithCueData(video, { align: 'end', line: 0 });
+  addTrackWithRtlCueData(video, { align: 'end', size: 50, line: 0 });
   video.src = mediaFile;
   </script>
 </video>