Moving GraphicsContext and dependencies from core to platform.

Source/platform/fonts/harfbuzz/FontPlatformDataHarfBuzz.h

Index: Source/platform/fonts/harfbuzz/FontPlatformDataHarfBuzz.h
diff --git a/Source/core/platform/graphics/harfbuzz/FontPlatformDataHarfBuzz.h b/Source/platform/fonts/harfbuzz/FontPlatformDataHarfBuzz.h
similarity index 98%
rename from Source/core/platform/graphics/harfbuzz/FontPlatformDataHarfBuzz.h
rename to Source/platform/fonts/harfbuzz/FontPlatformDataHarfBuzz.h
index b5b7c6fa0539b7db1cb7ae8124de50cb05dffdad..0ae633b9a82bbc4d4f0aeeaee0f5a7a60fe37681 100644
--- a/Source/core/platform/graphics/harfbuzz/FontPlatformDataHarfBuzz.h
+++ b/Source/platform/fonts/harfbuzz/FontPlatformDataHarfBuzz.h
@@ -33,10 +33,10 @@
 
 #include "SkPaint.h"
 #include "platform/SharedBuffer.h"
-#include "core/platform/graphics/opentype/OpenTypeVerticalData.h"
 #include "platform/fonts/FontDescription.h"
 #include "platform/fonts/FontOrientation.h"
 #include "platform/fonts/FontRenderStyle.h"
+#include "platform/fonts/opentype/OpenTypeVerticalData.h"
 #include "wtf/Forward.h"
 #include "wtf/HashTableDeletedValueType.h"
 #include "wtf/RefPtr.h"
@@ -56,7 +56,7 @@ class HarfBuzzFace;
 // is the tuple of (font, size, ...etc). Here we are just wrapping a Skia
 // SkTypeface pointer and dealing with the reference counting etc.
 // -----------------------------------------------------------------------------
-class FontPlatformData {
+class PLATFORM_EXPORT FontPlatformData {
 public:
     // Used for deleted values in the font cache's hash tables. The hash table
     // will create us with this structure, and it will compare other values