Move VTT functionality from TextTrackCue.* to VTTCue.*

Source/core/html/HTMLMediaElement.h

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 14 matching lines @@
 
 #ifndef HTMLMediaElement_h
 #define HTMLMediaElement_h
 
 #include "core/dom/ActiveDOMObject.h"
 #include "core/events/GenericEventQueue.h"
 #include "core/html/HTMLElement.h"
 #include "core/html/MediaControllerInterface.h"
 #include "core/html/track/TextTrack.h"
 #include "core/html/track/TextTrackCue.h"
+#include "core/html/track/vtt/VTTCue.h"
 #include "platform/PODIntervalTree.h"
 #include "platform/graphics/media/MediaPlayer.h"
 #include "public/platform/WebMimeRegistry.h"
 
 namespace blink {
 class WebInbandTextTrack;
 class WebLayer;
 }
 
 namespace WebCore {
@@ skipping 529 matching lines @@
     static String string(const double value)
     {
         return String::number(value);
     }
 };
 
 template <>
 struct ValueToString<TextTrackCue*> {
     static String string(TextTrackCue* const& cue)
     {
-        return String::format("%p id=%s interval=%f-->%f cue=%s)", cue, cue->id().utf8().data(), cue->startTime(), cue->endTime(), cue->text().utf8().data());
+        return cue->toString();
     }
 };
 #endif
 
 inline bool isHTMLMediaElement(Node* node)
 {
     return node && node->isElementNode() && toElement(node)->isMediaElement();
 }
 
 inline bool isHTMLMediaElement(const Node& node)
 {
     return node.isElementNode() && toElement(node).isMediaElement();
 }
 
 DEFINE_NODE_TYPE_CASTS_WITH_FUNCTION(HTMLMediaElement);
 
 } //namespace
 
 #endif