Moving GraphicsContext and dependencies from core to platform.

Source/platform/scroll/ScrollbarTheme.h

Index: Source/platform/scroll/ScrollbarTheme.h
diff --git a/Source/core/platform/ScrollbarTheme.h b/Source/platform/scroll/ScrollbarTheme.h
similarity index 98%
rename from Source/core/platform/ScrollbarTheme.h
rename to Source/platform/scroll/ScrollbarTheme.h
index 7bfb6b06cdd00295c5ffa7d8c21650163179a386..55612309f43583c7c967a5347bef9cf7b35ae923 100644
--- a/Source/core/platform/ScrollbarTheme.h
+++ b/Source/platform/scroll/ScrollbarTheme.h
@@ -26,8 +26,9 @@
 #ifndef ScrollbarTheme_h
 #define ScrollbarTheme_h
 
-#include "core/platform/graphics/GraphicsContext.h"
+#include "platform/PlatformExport.h"
 #include "platform/geometry/IntRect.h"
+#include "platform/graphics/GraphicsContext.h"
 #include "platform/scroll/ScrollTypes.h"
 
 namespace WebCore {
@@ -36,7 +37,7 @@ class PlatformMouseEvent;
 class ScrollbarThemeClient;
 class ScrollView;
 
-class ScrollbarTheme {
+class PLATFORM_EXPORT ScrollbarTheme {
     WTF_MAKE_NONCOPYABLE(ScrollbarTheme); WTF_MAKE_FAST_ALLOCATED;
 public:
     ScrollbarTheme() { }