Media Controls: Use events to update controls for closed captions.

third_party/WebKit/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 35 matching lines @@
 
   void show();
   void hide();
   bool isVisible() const;
 
   void beginScrubbing();
   void endScrubbing();
 
   void updateCurrentTimeDisplay();
 
-  void changedClosedCaptionsVisibility();
-  void refreshClosedCaptionsButtonVisibility();
   void toggleTextTrackList();
   void showTextTrackAtIndex(unsigned indexToEnable);
   void disableShowingTextTracks();
 
   void enteredFullscreen();
   void exitedFullscreen();
 
   void startedCasting();
   void stoppedCasting();
   void refreshCastButtonVisibility();
@@ skipping 20 matching lines @@
   // Notify us that our controls enclosure has changed width.
   void notifyPanelWidthChanged(const LayoutUnit& newWidth);
 
   // Notify us that the media element's network state has changed.
   void networkStateChanged();
 
   void toggleOverflowMenu();
 
   bool overflowMenuVisible();
 
+  // TODO(mlamouri): this is temporary to notify the controls that an
+  // HTMLTrackElement failed to load because there is no web exposed way to
+  // be notified on the TextTrack object. See https://crbug.com/669977
+  void onTrackElementFailedToLoad() { onTextTracksAddedOrRemoved(); }
+
   DECLARE_VIRTUAL_TRACE();
 
  private:
   friend class MediaControlsMediaEventListener;
   friend class MediaControlsTest;
 
   void invalidate(Element*);
 
   class BatchedControlUpdate;
 
@@ skipping 33 matching lines @@
   bool willRespondToMouseMoveEvents() override { return true; }
   void defaultEventHandler(Event*) override;
   bool containsRelatedTarget(Event*);
 
   // Methods called by MediaControlsMediaEventListener.
   void onVolumeChange();
   void onFocusIn();
   void onTimeUpdate();
   void onPlay();
   void onPause();
+  void onTextTracksAddedOrRemoved();
+  void onTextTracksChanged();
 
   Member<HTMLMediaElement> m_mediaElement;
 
   // Media control elements.
   Member<MediaControlOverlayEnclosureElement> m_overlayEnclosure;
   Member<MediaControlOverlayPlayButtonElement> m_overlayPlayButton;
   Member<MediaControlCastButtonElement> m_overlayCastButton;
   Member<MediaControlPanelEnclosureElement> m_enclosure;
   Member<MediaControlPanelElement> m_panel;
   Member<MediaControlPlayButtonElement> m_playButton;
@@ skipping 24 matching lines @@
   int m_panelWidth;
 
   bool m_keepShowingUntilTimerFires : 1;
 };
 
 DEFINE_ELEMENT_TYPE_CASTS(MediaControls, isMediaControls());
 
 }  // namespace blink
 
 #endif