Split VTTCue from TextTrackCue

Source/core/html/track/VTTCue.idl

Index: Source/core/html/track/VTTCue.idl
diff --git a/Source/core/css/xhtmlmp.css b/Source/core/html/track/VTTCue.idl
similarity index 72%
copy from Source/core/css/xhtmlmp.css
copy to Source/core/html/track/VTTCue.idl
index 11ea1cf1a031cfbf2694983c810bab1f925d99ae..f12c7b18b367dfb036512139271a60dc865c787e 100644
--- a/Source/core/css/xhtmlmp.css
+++ b/Source/core/html/track/VTTCue.idl
@@ -27,11 +27,18 @@
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-/* Default styles for XHTML Mobile Profile documents where they differ from html.css */
-
-@viewport {
-    width: auto;
-    /* Ideally these should be removed. Currently here to avoid test result regressions. */
-    min-zoom: 0.25;
-    max-zoom: 5;
-}
+[
+    RuntimeEnabled=VideoTrack,
+    Constructor(double startTime, double endTime, DOMString text),
+    ConstructorCallWith=Document
+] interface VTTCue : TextTrackCue {
+    [RuntimeEnabled=WebVTTRegions] attribute DOMString regionId;
+    [SetterRaisesException] attribute DOMString vertical;
+    attribute boolean snapToLines;
+    [SetterRaisesException] attribute long line;
+    [SetterRaisesException] attribute long position;
+    [SetterRaisesException] attribute long size;
+    [SetterRaisesException] attribute DOMString align;
+    attribute DOMString text;
+    DocumentFragment getCueAsHTML();
+};