Hook up Android closed captions 'enabled' setting to Blink

Source/core/page/Page.cpp

Index: Source/core/page/Page.cpp
diff --git a/Source/core/page/Page.cpp b/Source/core/page/Page.cpp
index 7d325ea83d9445eb6c46849a6e503666e2f62c15..68e8d2363b6db9ba8381ab6d746e68e4fc55ee14 100644
--- a/Source/core/page/Page.cpp
+++ b/Source/core/page/Page.cpp
@@ -34,6 +34,7 @@
 #include "core/frame/RemoteFrame.h"
 #include "core/frame/RemoteFrameView.h"
 #include "core/frame/Settings.h"
+#include "core/html/HTMLMediaElement.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/layout/LayoutView.h"
 #include "core/layout/TextAutosizer.h"
@@ -495,6 +496,15 @@ void Page::settingsChanged(SettingsDelegate::ChangeType changeType)
             doc->styleResolver()->viewportStyleResolver()->collectViewportRules();
         }
         break;
+    case SettingsDelegate::TextTrackKindUserPreferenceChange:
+        for (Frame* frame = mainFrame(); frame; frame = frame->tree().traverseNext()) {
+            if (frame->isLocalFrame()) {
+                Document* doc = toLocalFrame(frame)->document();
+                if (doc)
+                    HTMLMediaElement::setTextTrackKindUserPreferenceForAllMediaElements(doc);
+            }
+        }
+        break;
     }
 }