Start separating the text track container from the media controls

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 40 matching lines @@
 class CueTimeline;
 class Event;
 class ExceptionState;
 class HTMLSourceElement;
 class HTMLTrackElement;
 class KURL;
 class MediaController;
 class MediaControls;
 class MediaError;
 class HTMLMediaSource;
+class TextTrackContainer;
 class TextTrackList;
 class TimeRanges;
 class URLRegistry;
 class VideoTrackList;
 
 // FIXME: The inheritance from MediaPlayerClient here should be private inheritance.
 // But it can't be until the Chromium WebMediaPlayerClientImpl class is fixed so it
 // no longer depends on typecasting a MediaPlayerClient to an HTMLMediaElement.
 
 class HTMLMediaElement : public HTMLElement, public WillBeHeapSupplementable<HTMLMediaElement>, public MediaPlayerClient, public ActiveDOMObject {
@@ skipping 336 matching lines @@
     enum class LoopCondition { Included, Ignored };
     bool endedPlayback(LoopCondition = LoopCondition::Included) const;
 
     void setShouldDelayLoadEvent(bool);
     void invalidateCachedTime();
     void refreshCachedTime() const;
 
     void ensureMediaControls();
     void configureMediaControls();
 
+    TextTrackContainer& ensureTextTrackContainer();
+
     virtual void* preDispatchEventHandler(Event*) override final;
 
     void changeNetworkStateFromLoadingToIdle();
 
     const AtomicString& mediaGroup() const;
     void setMediaGroup(const AtomicString&);
     void updateMediaController();
     bool isBlocked() const;
     bool isBlockedOnMediaController() const;
     bool isAutoplaying() const { return m_autoplaying; }
@@ skipping 152 matching lines @@
 inline bool isHTMLMediaElement(const HTMLElement& element)
 {
     return isHTMLAudioElement(element) || isHTMLVideoElement(element);
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLMediaElement);
 
 } // namespace blink
 
 #endif // HTMLMediaElement_h