Moving GraphicsContext and dependencies from core to platform.

Source/platform/graphics/GraphicsLayerFactory.h

Index: Source/platform/graphics/GraphicsLayerFactory.h
diff --git a/Source/core/platform/graphics/GraphicsLayerFactory.h b/Source/platform/graphics/GraphicsLayerFactory.h
similarity index 95%
rename from Source/core/platform/graphics/GraphicsLayerFactory.h
rename to Source/platform/graphics/GraphicsLayerFactory.h
index da054e84f71d44dfd5e3486ecd1bfc184f445ab6..7ab986b185bb00cb5a12fb7d98be4f542dfbc38b 100644
--- a/Source/core/platform/graphics/GraphicsLayerFactory.h
+++ b/Source/platform/graphics/GraphicsLayerFactory.h
@@ -26,6 +26,7 @@
 #ifndef GraphicsLayerFactory_h
 #define GraphicsLayerFactory_h
 
+#include "platform/PlatformExport.h"
 #include "wtf/Forward.h"
 
 namespace WebCore {
@@ -33,7 +34,7 @@ namespace WebCore {
 class GraphicsLayer;
 class GraphicsLayerClient;
 
-class GraphicsLayerFactory {
+class PLATFORM_EXPORT GraphicsLayerFactory {
 public:
     virtual ~GraphicsLayerFactory() { }