Moving GraphicsContext and dependencies from core to platform.

Source/platform/mac/ScrollAnimatorMac.h

Index: Source/platform/mac/ScrollAnimatorMac.h
diff --git a/Source/core/platform/mac/ScrollAnimatorMac.h b/Source/platform/mac/ScrollAnimatorMac.h
similarity index 96%
rename from Source/core/platform/mac/ScrollAnimatorMac.h
rename to Source/platform/mac/ScrollAnimatorMac.h
index 6b58ac4efae21136bb575d51e709858d8a8638eb..0569ce2ba3dfb8b41e0a731fbcb48807b3a0e8f2 100644
--- a/Source/core/platform/mac/ScrollAnimatorMac.h
+++ b/Source/platform/mac/ScrollAnimatorMac.h
@@ -26,12 +26,12 @@
 #ifndef ScrollAnimatorMac_h
 #define ScrollAnimatorMac_h
 
-#include "core/platform/ScrollAnimator.h"
-#include "core/platform/mac/ScrollElasticityController.h"
 #include "platform/Timer.h"
 #include "platform/geometry/FloatPoint.h"
 #include "platform/geometry/FloatSize.h"
 #include "platform/geometry/IntRect.h"
+#include "platform/mac/ScrollElasticityController.h"
+#include "platform/scroll/ScrollAnimator.h"
 #include "wtf/RetainPtr.h"
 
 OBJC_CLASS WebScrollAnimationHelperDelegate;
@@ -48,7 +48,7 @@ namespace WebCore {
 
 class Scrollbar;
 
-class ScrollAnimatorMac : public ScrollAnimator, private ScrollElasticityControllerClient {
+class PLATFORM_EXPORT ScrollAnimatorMac : public ScrollAnimator, private ScrollElasticityControllerClient {
 
 public:
     ScrollAnimatorMac(ScrollableArea*);