Introduce FontCache content scaling

third_party/WebKit/Source/platform/fonts/FontCache.h

 /*
  * Copyright (C) 2006, 2008 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2007-2008 Torch Mobile, Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 150 matching lines @@
         ASSERT(m_purgePreventCount);
         if (!--m_purgePreventCount)
             purge(PurgeIfNeeded);
     }
 
     // FIXME: This method should eventually be removed.
     FontPlatformData* getFontPlatformData(const FontDescription&, const FontFaceCreationParams&, bool checkingAlternateName = false);
 
     // These methods are implemented by each platform.
     PassOwnPtr<FontPlatformData> createFontPlatformData(const FontDescription&, const FontFaceCreationParams&, float fontSize);
+    PassOwnPtr<FontPlatformData> scaleFontPlatformData(const FontPlatformData*, const FontDescription&, const FontFaceCreationParams&, float fontSize);
 
     // Implemented on skia platforms.
     PassRefPtr<SkTypeface> createTypeface(const FontDescription&, const FontFaceCreationParams&, CString& name);
 
 #if OS(ANDROID) || OS(LINUX)
     static AtomicString getFamilyNameForCharacter(SkFontMgr*, UChar32, const FontDescription&, FontFallbackPriority);
 #endif
 
     PassRefPtr<SimpleFontData> fallbackOnStandardFontStyle(const FontDescription&, UChar32);
 
@@ skipping 29 matching lines @@
 public:
     FontCachePurgePreventer() { FontCache::fontCache()->disablePurging(); }
     ~FontCachePurgePreventer() { FontCache::fontCache()->enablePurging(); }
 };
 
 CString toSkFontMgrLocale(const String& locale);
 
 } // namespace blink
 
 #endif