Hook up Android closed captions 'enabled' setting to Blink

Source/core/dom/Document.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 99 matching lines @@
 class HTMLAllCollection;
 class HTMLCanvasElement;
 class HTMLCollection;
 class HTMLDialogElement;
 class HTMLElement;
 class HTMLFrameOwnerElement;
 class HTMLHeadElement;
 class HTMLImportLoader;
 class HTMLImportsController;
 class HTMLLinkElement;
+class HTMLMediaElement;
 class HTMLScriptElement;
 class HitTestRequest;
 class LayoutPoint;
 class LiveNodeListBase;
 class Locale;
 class LocalFrame;
 class Location;
 class MainThreadTaskRunner;
 class MediaQueryListListener;
 class MediaQueryMatcher;
@@ skipping 100 matching lines @@
     static PassRefPtrWillBeRawPtr<Document> create(const DocumentInit& initializer = DocumentInit())
     {
         return adoptRefWillBeNoop(new Document(initializer));
     }
     virtual ~Document();
 
     MediaQueryMatcher& mediaQueryMatcher();
 
     void mediaQueryAffectingValueChanged();
 
+    void registerForTextTracksVisibilityChangedCallback(HTMLMediaElement*);
+    void unregisterFromTextTracksVisibilityChangedCallback(HTMLMediaElement*);
+    void textTracksVisibilityChanged(bool visible);
+
 #if !ENABLE(OILPAN)
     using ContainerNode::ref;
     using ContainerNode::deref;
 #endif
     using SecurityContext::securityOrigin;
     using SecurityContext::contentSecurityPolicy;
     using TreeScope::getElementById;
 
     virtual bool canContainRangeEndPoint() const override { return true; }
 
@@ skipping 1154 matching lines @@
     bool m_hasViewportUnits;
 
     using DocumentVisibilityObserverSet = WillBeHeapHashSet<RawPtrWillBeWeakMember<DocumentVisibilityObserver>>;
     DocumentVisibilityObserverSet m_visibilityObservers;
 
     int m_styleRecalcElementCounter;
 
     ParserSynchronizationPolicy m_parserSyncPolicy;
 
     OriginsUsingFeatures::Value m_originsUsingFeaturesValue;
+
+    Vector<HTMLMediaElement*> m_textTracksVisibilityChangedElements;

[tkent, 2015/04/29 23:58:44]

Setting change won't happen so frequently, and doesn't need to be fast.
Please don't keep the list of HTMLMediaElement.

[srivats, 2015/05/01 23:03:31]

Done.

 };
 
 inline bool Document::shouldOverrideLegacyDescription(ViewportDescription::Type origin)
 {
     // The different (legacy) meta tags have different priorities based on the type
     // regardless of which order they appear in the DOM. The priority is given by the
     // ViewportDescription::Type enum.
     return origin >= m_legacyViewportDescription.type;
 }
 
@@ skipping 27 matching lines @@
 DEFINE_TYPE_CASTS(TreeScope, Document, document, true, true);
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showLiveDocumentInstances();
 #endif
 
 #endif // Document_h