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 bcbb175c612174016ed1ac4a1395b937f2d8b9db..558b51a102660fd5ee205025908bd644f7d0fddb 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 +496,13 @@ 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()) {
+                HTMLMediaElement::setTextTrackKindUserPreferenceForAllMediaElements(toLocalFrame(frame)->document());
+            }
+        }
+        break;
     }
 }