Moving GraphicsContext and dependencies from core to platform.

Source/platform/fonts/FontCache.h

Index: Source/platform/fonts/FontCache.h
diff --git a/Source/core/platform/graphics/FontCache.h b/Source/platform/fonts/FontCache.h
similarity index 94%
rename from Source/core/platform/graphics/FontCache.h
rename to Source/platform/fonts/FontCache.h
index 45840680ca544e12a05f25f55c5781600ad0d826..8dde8caf322f00a42fe2b5eb07f1e14ef93911c5 100644
--- a/Source/core/platform/graphics/FontCache.h
+++ b/Source/platform/fonts/FontCache.h
@@ -31,6 +31,7 @@
 #define FontCache_h
 
 #include <limits.h>
+#include "platform/PlatformExport.h"
 #include "wtf/Forward.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
@@ -63,12 +64,12 @@ class SimpleFontData;
 enum ShouldRetain { Retain, DoNotRetain };
 enum PurgeSeverity { PurgeIfNeeded, ForcePurge };
 
-class FontCache {
+class PLATFORM_EXPORT FontCache {
     friend class FontCachePurgePreventer;
 
     WTF_MAKE_NONCOPYABLE(FontCache); WTF_MAKE_FAST_ALLOCATED;
 public:
-    friend FontCache* fontCache();
+    static FontCache* fontCache();
 
     void releaseFontData(const SimpleFontData*);
 
@@ -150,13 +151,10 @@ private:
     friend class FontFallbackList;
 };
 
-// Get the global fontCache.
-FontCache* fontCache();
-
-class FontCachePurgePreventer {
+class PLATFORM_EXPORT FontCachePurgePreventer {
 public:
-    FontCachePurgePreventer() { fontCache()->disablePurging(); }
-    ~FontCachePurgePreventer() { fontCache()->enablePurging(); }
+    FontCachePurgePreventer() { FontCache::fontCache()->disablePurging(); }
+    ~FontCachePurgePreventer() { FontCache::fontCache()->enablePurging(); }
 };
 
 }