Moving GraphicsContext and dependencies from core to platform.

Source/platform/graphics/skia/OpaqueRegionSkia.h

Index: Source/platform/graphics/skia/OpaqueRegionSkia.h
diff --git a/Source/core/platform/graphics/skia/OpaqueRegionSkia.h b/Source/platform/graphics/skia/OpaqueRegionSkia.h
similarity index 97%
rename from Source/core/platform/graphics/skia/OpaqueRegionSkia.h
rename to Source/platform/graphics/skia/OpaqueRegionSkia.h
index 3c067009216718d8c98a9e06450a0522a286040a..1e0bc4e6370ebd524e3a979dde8d72b7ced61162 100644
--- a/Source/core/platform/graphics/skia/OpaqueRegionSkia.h
+++ b/Source/platform/graphics/skia/OpaqueRegionSkia.h
@@ -31,6 +31,7 @@
 #ifndef OpaqueRegionSkia_h
 #define OpaqueRegionSkia_h
 
+#include "platform/PlatformExport.h"
 #include "platform/geometry/IntRect.h"
 
 #include "SkBitmap.h"
@@ -44,7 +45,7 @@ class GraphicsContext;
 
 // This class is an encapsulation of functionality for GraphicsContext, and its methods are mirrored
 // there for the outside world. It tracks paints and computes what area will be opaque.
-class OpaqueRegionSkia FINAL {
+class PLATFORM_EXPORT OpaqueRegionSkia FINAL {
 public:
     OpaqueRegionSkia();