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 291cf21181c6eb959850bcd2c3314efe866ad630..7e95e3091323a768fe233b585fe3265ca4663010 100644
--- a/Source/core/page/Page.cpp
+++ b/Source/core/page/Page.cpp
@@ -500,6 +500,14 @@ void Page::settingsChanged(SettingsDelegate::ChangeType changeType)
             doc->styleResolver()->viewportStyleResolver()->collectViewportRules();
         }
         break;
+    case SettingsDelegate::TextTracksVisibilityChange:
+        for (Frame* frame = mainFrame(); frame; frame = frame->tree().traverseNext()) {
+            if (frame->isLocalFrame()) {
+                toLocalFrame(frame)->document()->textTracksVisibilityChanged(
+                    m_settings->textTracksEnabled());
+            }
+        }
+        break;
     }
 }