Moving GraphicsContext and dependencies from core to platform.

Source/platform/graphics/ImageFrameGenerator.h

Index: Source/platform/graphics/ImageFrameGenerator.h
diff --git a/Source/core/platform/graphics/ImageFrameGenerator.h b/Source/platform/graphics/ImageFrameGenerator.h
similarity index 93%
rename from Source/core/platform/graphics/ImageFrameGenerator.h
rename to Source/platform/graphics/ImageFrameGenerator.h
index 627229de8a58afeac626baa0b8dc744ecee1dbd6..964b0937ebfb2980e315d98610e8440b6b67ea8a 100644
--- a/Source/core/platform/graphics/ImageFrameGenerator.h
+++ b/Source/platform/graphics/ImageFrameGenerator.h
@@ -29,6 +29,7 @@
 #include "SkBitmap.h"
 #include "SkSize.h"
 #include "SkTypes.h"
+#include "platform/PlatformExport.h"
 #include "platform/graphics/ThreadSafeDataTransport.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/PassRefPtr.h"
@@ -44,13 +45,16 @@ class ImageDecoder;
 class ScaledImageFragment;
 class SharedBuffer;
 
-class ImageDecoderFactory {
+class PLATFORM_EXPORT ImageDecoderFactory {
+    WTF_MAKE_NONCOPYABLE(ImageDecoderFactory);
 public:
+    ImageDecoderFactory() {}
     virtual ~ImageDecoderFactory() { }
     virtual PassOwnPtr<ImageDecoder> create() = 0;
 };
 
-class ImageFrameGenerator : public ThreadSafeRefCounted<ImageFrameGenerator> {
+class PLATFORM_EXPORT ImageFrameGenerator : public ThreadSafeRefCounted<ImageFrameGenerator> {
+    WTF_MAKE_NONCOPYABLE(ImageFrameGenerator);
 public:
     static PassRefPtr<ImageFrameGenerator> create(const SkISize& fullSize, PassRefPtr<SharedBuffer> data, bool allDataReceived, bool isMultiFrame = false)
     {