Moving GraphicsContext and dependencies from core to platform.

Source/platform/graphics/skia/NativeImageSkia.h

Index: Source/platform/graphics/skia/NativeImageSkia.h
diff --git a/Source/core/platform/graphics/skia/NativeImageSkia.h b/Source/platform/graphics/skia/NativeImageSkia.h
similarity index 98%
rename from Source/core/platform/graphics/skia/NativeImageSkia.h
rename to Source/platform/graphics/skia/NativeImageSkia.h
index 996ff7bdcfcef9652ce475254ad17c8c91387fcc..2b05bc29be17a853f8a783b7cb7c3ac113bec4c4 100644
--- a/Source/core/platform/graphics/skia/NativeImageSkia.h
+++ b/Source/platform/graphics/skia/NativeImageSkia.h
@@ -35,6 +35,7 @@
 #include "SkRect.h"
 #include "SkSize.h"
 #include "SkXfermode.h"
+#include "platform/PlatformExport.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/graphics/GraphicsTypes.h"
 #include "wtf/Forward.h"
@@ -68,7 +69,7 @@ enum ResamplingMode {
 // This object is used as the "native image" in our port. When WebKit uses
 // PassNativeImagePtr / NativeImagePtr, it is a smart pointer to this type.
 // It has an SkBitmap, and also stores a cached resized image.
-class NativeImageSkia : public RefCounted<NativeImageSkia> {
+class PLATFORM_EXPORT NativeImageSkia : public RefCounted<NativeImageSkia> {
 public:
     static PassRefPtr<NativeImageSkia> create()
     {