Hook up Android closed captions 'enabled' setting to Blink

Source/core/dom/Document.cpp

 /*
  * 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, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 123 matching lines @@
 #include "core/html/HTMLCanvasElement.h"
 #include "core/html/HTMLCollection.h"
 #include "core/html/HTMLDialogElement.h"
 #include "core/html/HTMLDocument.h"
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "core/html/HTMLHeadElement.h"
 #include "core/html/HTMLHtmlElement.h"
 #include "core/html/HTMLIFrameElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLLinkElement.h"
+#include "core/html/HTMLMediaElement.h"
 #include "core/html/HTMLMetaElement.h"
 #include "core/html/HTMLScriptElement.h"
 #include "core/html/HTMLStyleElement.h"
 #include "core/html/HTMLTemplateElement.h"
 #include "core/html/HTMLTitleElement.h"
 #include "core/html/PluginDocument.h"
 #include "core/html/WindowNameCollection.h"
 #include "core/html/canvas/CanvasContextCreationAttributes.h"
 #include "core/html/canvas/CanvasRenderingContext.h"
 #include "core/html/canvas/CanvasRenderingContext2D.h"
@@ skipping 511 matching lines @@
     return *m_mediaQueryMatcher;
 }
 
 void Document::mediaQueryAffectingValueChanged()
 {
     m_evaluateMediaQueriesOnStyleRecalc = true;
     styleEngine().clearMediaQueryRuleSetStyleSheets();
     InspectorInstrumentation::mediaQueryResultChanged(this);
 }
 
+void Document::textTracksVisibilityChanged(bool visible)
+{
+    for (HTMLMediaElement* mediaElement = Traversal<HTMLMediaElement>::firstWithin(*this); mediaElement;

[philipj_slow, 2015/05/06 09:54:27]

There's alrady a documentToElementSetMap() in HTMLMediaElement.cpp that could be
used to avoid the traversal, see usage in HTMLMediaElement::setMediaGroup.

[srivats, 2015/06/09 00:45:51]

Done.

+        mediaElement = Traversal<HTMLMediaElement>::next(*mediaElement)) {
+        mediaElement->setClosedCaptionsVisible(visible);
+    }
+}
+
 void Document::setCompatibilityMode(CompatibilityMode mode)
 {
     if (m_compatibilityModeLocked || mode == m_compatibilityMode)
         return;
     m_compatibilityMode = mode;
     selectorQueryCache().invalidate();
 }
 
 String Document::compatMode() const
 {
@@ skipping 5023 matching lines @@
 #ifndef NDEBUG
 using namespace blink;
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (Document* document : set)
         fprintf(stderr, "- Document %p URL: %s\n", document, document->url().string().utf8().data());
 }
 #endif