Moving GraphicsContext and dependencies from core to platform.

Source/platform/scroll/ScrollbarThemeMacOverlayAPI.h

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 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 ScrollbarThemeMacOverlayAPI_h
 #define ScrollbarThemeMacOverlayAPI_h
 
-#include "core/platform/ScrollbarThemeMacCommon.h"
+#include "platform/scroll/ScrollbarThemeMacCommon.h"
 
 typedef id ScrollbarPainter;
 
 namespace WebCore {
 
-class ScrollbarThemeMacOverlayAPI : public ScrollbarThemeMacCommon {
+class PLATFORM_EXPORT ScrollbarThemeMacOverlayAPI : public ScrollbarThemeMacCommon {
 public:
     virtual void updateEnabledState(ScrollbarThemeClient*) OVERRIDE;
     virtual int scrollbarThickness(ScrollbarControlSize = RegularScrollbar) OVERRIDE;
     virtual bool usesOverlayScrollbars() const OVERRIDE;
     virtual void updateScrollbarOverlayStyle(ScrollbarThemeClient*) OVERRIDE;
     virtual ScrollbarButtonsPlacement buttonsPlacement() const OVERRIDE;
 
     virtual void registerScrollbar(ScrollbarThemeClient*) OVERRIDE;
     virtual void unregisterScrollbar(ScrollbarThemeClient*) OVERRIDE;
 
@@ skipping 10 matching lines @@
 
     virtual bool hasButtons(ScrollbarThemeClient*) OVERRIDE { return false; }
     virtual bool hasThumb(ScrollbarThemeClient*) OVERRIDE;
 
     virtual int minimumThumbLength(ScrollbarThemeClient*) OVERRIDE;
 };
 
 }
 
 #endif