Start separating the text track container from the media controls

Source/core/html/shadow/MediaControls.h

 /*
  * Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2011, 2012 Google 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
@@ skipping 15 matching lines @@
 
 #ifndef MediaControls_h
 #define MediaControls_h
 
 #include "core/html/HTMLDivElement.h"
 #include "core/html/shadow/MediaControlElements.h"
 
 namespace blink {
 
 class Event;
+class TextTrackContainer;
 
 class MediaControls final : public HTMLDivElement {
 public:
     static PassRefPtrWillBeRawPtr<MediaControls> create(HTMLMediaElement&);
 
     HTMLMediaElement& mediaElement() const { return *m_mediaElement; }
 
     void reset();
 
     void show();
@@ skipping 14 matching lines @@
     void refreshClosedCaptionsButtonVisibility();
 
     void enteredFullscreen();
     void exitedFullscreen();
 
     void startedCasting();
     void stoppedCasting();
     void refreshCastButtonVisibility();
     void showOverlayCastButton();
 
-    void updateTextTrackDisplay();
+    TextTrackContainer* textTrackContainer();
 
     void mediaElementFocused();
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     explicit MediaControls(HTMLMediaElement&);
 
     void initializeControls();
 
@@ skipping 12 matching lines @@
     bool shouldHideMediaControls(unsigned behaviorFlags = 0) const;
     void hideMediaControlsTimerFired(Timer<MediaControls>*);
     void startHideMediaControlsTimer();
     void stopHideMediaControlsTimer();
     void resetHideMediaControlsTimer();
 
     // Attempts to show the overlay cast button. If it is covered by another
     // element in the page, it will be hidden.
     void tryShowOverlayCastButton();
 
-    void createTextTrackDisplay();
-
     // Node
     virtual bool isMediaControls() const override { return true; }
     virtual bool willRespondToMouseMoveEvents() override { return true; }
     virtual void defaultEventHandler(Event*) override;
     bool containsRelatedTarget(Event*);
 
     RawPtrWillBeMember<HTMLMediaElement> m_mediaElement;
 
     // Container for the media control elements.
     RawPtrWillBeMember<MediaControlPanelElement> m_panel;
 
     // Container for the text track cues.
-    RawPtrWillBeMember<MediaControlTextTrackContainerElement> m_textDisplayContainer;
+    RawPtrWillBeMember<TextTrackContainer> m_textTrackContainer;
 
     // Media control elements.
     RawPtrWillBeMember<MediaControlOverlayPlayButtonElement> m_overlayPlayButton;
     RawPtrWillBeMember<MediaControlOverlayEnclosureElement> m_overlayEnclosure;
     RawPtrWillBeMember<MediaControlPlayButtonElement> m_playButton;
     RawPtrWillBeMember<MediaControlCurrentTimeDisplayElement> m_currentTimeDisplay;
     RawPtrWillBeMember<MediaControlTimelineElement> m_timeline;
     RawPtrWillBeMember<MediaControlMuteButtonElement> m_muteButton;
     RawPtrWillBeMember<MediaControlVolumeSliderElement> m_volumeSlider;
     RawPtrWillBeMember<MediaControlToggleClosedCaptionsButtonElement> m_toggleClosedCaptionsButton;
     RawPtrWillBeMember<MediaControlFullscreenButtonElement> m_fullScreenButton;
     RawPtrWillBeMember<MediaControlCastButtonElement> m_castButton;
     RawPtrWillBeMember<MediaControlCastButtonElement> m_overlayCastButton;
     RawPtrWillBeMember<MediaControlTimeRemainingDisplayElement> m_durationDisplay;
     RawPtrWillBeMember<MediaControlPanelEnclosureElement> m_enclosure;
 
     Timer<MediaControls> m_hideMediaControlsTimer;
     unsigned m_hideTimerBehaviorFlags;
     bool m_isMouseOverControls : 1;
     bool m_isPausedForScrubbing : 1;
 };
 
 DEFINE_ELEMENT_TYPE_CASTS(MediaControls, isMediaControls());
 
 }
 
 #endif