Moving GraphicsContext and dependencies from core to platform.

Source/platform/graphics/filters/Filter.h

Index: Source/platform/graphics/filters/Filter.h
diff --git a/Source/core/platform/graphics/filters/Filter.h b/Source/platform/graphics/filters/Filter.h
similarity index 96%
rename from Source/core/platform/graphics/filters/Filter.h
rename to Source/platform/graphics/filters/Filter.h
index 53787df68f730b8c904bb44dbe8d4c3081d1622a..483a5d585278774839eff5bed802e784f5ac6ac2 100644
--- a/Source/core/platform/graphics/filters/Filter.h
+++ b/Source/platform/graphics/filters/Filter.h
@@ -21,16 +21,17 @@
 #ifndef Filter_h
 #define Filter_h
 
-#include "core/platform/graphics/ImageBuffer.h"
+#include "platform/PlatformExport.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/geometry/FloatSize.h"
+#include "platform/graphics/ImageBuffer.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
 class FilterEffect;
 
-class Filter : public RefCounted<Filter> {
+class PLATFORM_EXPORT Filter : public RefCounted<Filter> {
 public:
     Filter(const AffineTransform& absoluteTransform) : m_renderingMode(Unaccelerated), m_absoluteTransform(absoluteTransform) { }
     virtual ~Filter() { }