Supplement should have a Member to the corresponding Supplementable object

third_party/WebKit/Source/core/frame/Screen.h

Index: third_party/WebKit/Source/core/frame/Screen.h
diff --git a/third_party/WebKit/Source/core/frame/Screen.h b/third_party/WebKit/Source/core/frame/Screen.h
index 7b4eeb4fb992661b42d09deac0cfba0d5fe8fa83..cfc9b8deb1e36057255516e299cca2350e8f6203 100644
--- a/third_party/WebKit/Source/core/frame/Screen.h
+++ b/third_party/WebKit/Source/core/frame/Screen.h
@@ -30,6 +30,7 @@
 #define Screen_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
+#include "core/CoreExport.h"
 #include "core/dom/ContextLifecycleObserver.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
@@ -38,10 +39,10 @@ namespace blink {
 
 class LocalFrame;
 
-class Screen final : public GarbageCollected<Screen>,
-                     public ScriptWrappable,
-                     public ContextClient,
-                     public Supplementable<Screen> {
+class CORE_EXPORT Screen final : public GarbageCollected<Screen>,
+                                 public ScriptWrappable,
+                                 public ContextClient,
+                                 public Supplementable<Screen> {
   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(Screen);