Moving GraphicsContext and dependencies from core to platform.

Source/platform/graphics/filters/ReferenceFilter.h

 /*
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  * 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:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
@@ skipping 13 matching lines @@
  * 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 ReferenceFilter_h
 #define ReferenceFilter_h
 
-#include "core/platform/graphics/filters/Filter.h"
 #include "platform/geometry/FloatRect.h"
+#include "platform/graphics/filters/Filter.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 class SourceGraphic;
 class FilterEffect;
 
-class ReferenceFilter: public Filter {
+class PLATFORM_EXPORT ReferenceFilter: public Filter {
 public:
     static PassRefPtr<ReferenceFilter> create()
     {
         return adoptRef(new ReferenceFilter());
     }
 
     virtual FloatRect sourceImageRect() const { return FloatRect(); };
 
     void setLastEffect(PassRefPtr<FilterEffect>);
     FilterEffect* lastEffect() const { return m_lastEffect.get(); }
 
     SourceGraphic* sourceGraphic() const { return m_sourceGraphic.get(); }
 
 private:
     ReferenceFilter();
     ~ReferenceFilter();
 
     RefPtr<SourceGraphic> m_sourceGraphic;
     RefPtr<FilterEffect> m_lastEffect;
 };
 
 }
 
 #endif // ReferenceFilter_h