Moving GraphicsContext and dependencies from core to platform.

Source/platform/fonts/SegmentedFontData.h

Index: Source/platform/fonts/SegmentedFontData.h
diff --git a/Source/core/platform/graphics/SegmentedFontData.h b/Source/platform/fonts/SegmentedFontData.h
similarity index 97%
rename from Source/core/platform/graphics/SegmentedFontData.h
rename to Source/platform/fonts/SegmentedFontData.h
index ab800672f8e9d56d0df39f393010c5ba2143da3e..ffc34e067e9f88040186b50f385ce2fbc528eb7f 100644
--- a/Source/core/platform/graphics/SegmentedFontData.h
+++ b/Source/platform/fonts/SegmentedFontData.h
@@ -26,6 +26,7 @@
 #ifndef SegmentedFontData_h
 #define SegmentedFontData_h
 
+#include "platform/PlatformExport.h"
 #include "platform/fonts/FontData.h"
 #include "wtf/Vector.h"
 
@@ -52,7 +53,7 @@ private:
     RefPtr<SimpleFontData> m_fontData;
 };
 
-class SegmentedFontData : public FontData {
+class PLATFORM_EXPORT SegmentedFontData : public FontData {
 public:
     static PassRefPtr<SegmentedFontData> create() { return adoptRef(new SegmentedFontData); }