Factor CSS3 matching rules.

include/ports/SkFontMgr.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkFontMgr_DEFINED
 #define SkFontMgr_DEFINED
 
 #include "SkRefCnt.h"
 #include "SkFontStyle.h"
 
 class SkData;
 class SkFontData;
 class SkStreamAsset;
 class SkString;
 class SkTypeface;
 
 class SK_API SkFontStyleSet : public SkRefCnt {
 public:
-    
-
     virtual int count() = 0;
     virtual void getStyle(int index, SkFontStyle*, SkString* style) = 0;
     virtual SkTypeface* createTypeface(int index) = 0;
     virtual SkTypeface* matchStyle(const SkFontStyle& pattern) = 0;
 
     static SkFontStyleSet* CreateEmpty();
 
+protected:
+    SkTypeface* matchStyleCSS3(const SkFontStyle& pattern);
+
 private:
     typedef SkRefCnt INHERITED;
 };
 
-class SkTypeface;
-
 class SK_API SkFontMgr : public SkRefCnt {
 public:
-    
-
     int countFamilies() const;
     void getFamilyName(int index, SkString* familyName) const;
     SkFontStyleSet* createStyleSet(int index) const;
 
     /**
      *  The caller must call unref() on the returned object.
      *  Never returns NULL; will return an empty set if the name is not found.
      *
      *  It is possible that this will return a style set not accessible from
      *  createStyleSet(int) due to hidden or auto-activated fonts.
@@ skipping 94 matching lines @@
     virtual SkTypeface* onLegacyCreateTypeface(const char familyName[],
                                                unsigned styleBits) const = 0;
 private:
     static SkFontMgr* Factory();    // implemented by porting layer
     friend SkFontMgr* sk_fontmgr_create_default();
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif