Moving GraphicsContext and dependencies from core to platform.

Source/platform/graphics/DeferredImageDecoder.h

Index: Source/platform/graphics/DeferredImageDecoder.h
diff --git a/Source/core/platform/graphics/DeferredImageDecoder.h b/Source/platform/graphics/DeferredImageDecoder.h
similarity index 92%
rename from Source/core/platform/graphics/DeferredImageDecoder.h
rename to Source/platform/graphics/DeferredImageDecoder.h
index 4f5f549980fb0f5323781c462a81025992cc12cc..d87284d0e924aea72a81a935ead48eb37de1a561 100644
--- a/Source/core/platform/graphics/DeferredImageDecoder.h
+++ b/Source/platform/graphics/DeferredImageDecoder.h
@@ -27,9 +27,11 @@
 #define DeferredImageDecoder_h
 
 #include "SkBitmap.h"
-#include "core/platform/graphics/ImageSource.h"
-#include "core/platform/image-decoders/ImageDecoder.h"
+#include "platform/PlatformExport.h"
 #include "platform/geometry/IntSize.h"
+#include "platform/graphics/ImageFrameGenerator.h"
+#include "platform/graphics/ImageSource.h"
+#include "platform/image-decoders/ImageDecoder.h"
 #include "wtf/Forward.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/Vector.h"
@@ -39,7 +41,8 @@ namespace WebCore {
 class ImageFrameGenerator;
 class SharedBuffer;
 
-class DeferredImageDecoder {
+class PLATFORM_EXPORT DeferredImageDecoder {
+    WTF_MAKE_NONCOPYABLE(DeferredImageDecoder);
 public:
     ~DeferredImageDecoder();
     static PassOwnPtr<DeferredImageDecoder> create(const SharedBuffer& data, ImageSource::AlphaOption, ImageSource::GammaAndColorProfileOption);