Supplement should have a Member to the corresponding Supplementable object

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

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 12 matching lines @@
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef Screen_h
 #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"
 
 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);
 
  public:
   static Screen* create(LocalFrame* frame) { return new Screen(frame); }
 
   int height() const;
   int width() const;
   unsigned colorDepth() const;
   unsigned pixelDepth() const;
   int availLeft() const;
   int availTop() const;
   int availHeight() const;
   int availWidth() const;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   explicit Screen(LocalFrame*);
 };
 
 }  // namespace blink
 
 #endif  // Screen_h