Moving GraphicsContext and dependencies from core to platform.

Source/platform/graphics/filters/ReferenceFilter.h

Index: Source/platform/graphics/filters/ReferenceFilter.h
diff --git a/Source/core/platform/graphics/filters/ReferenceFilter.h b/Source/platform/graphics/filters/ReferenceFilter.h
similarity index 95%
rename from Source/core/platform/graphics/filters/ReferenceFilter.h
rename to Source/platform/graphics/filters/ReferenceFilter.h
index ab1d817aa1ce0ac5ed2afcf31a6cb411b265d3bf..bc9fa3159ef63739481a042b7868c437b63aa6e0 100644
--- a/Source/core/platform/graphics/filters/ReferenceFilter.h
+++ b/Source/platform/graphics/filters/ReferenceFilter.h
@@ -31,8 +31,8 @@
 #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"
 
@@ -41,7 +41,7 @@ namespace WebCore {
 class SourceGraphic;
 class FilterEffect;
 
-class ReferenceFilter: public Filter {
+class PLATFORM_EXPORT ReferenceFilter: public Filter {
 public:
     static PassRefPtr<ReferenceFilter> create()
     {