Reland r172943 "Make CSSFontFace::willUseFontData() load fonts with unicode-range"

Source/core/css/CSSFontFace.h

 /*
  * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
  *
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 79 matching lines @@
         bool operator<(UChar32 c) const { return m_to < c; }
 
     private:
         UChar32 m_from;
         UChar32 m_to;
     };
 
     class UnicodeRangeSet {
     public:
         explicit UnicodeRangeSet(const Vector<UnicodeRange>&);
+        bool contains(UChar32) const;
         bool intersectsWith(const String&) const;
         bool isEntireRange() const { return m_ranges.isEmpty(); }
         size_t size() const { return m_ranges.size(); }
         const UnicodeRange& rangeAt(size_t i) const { return m_ranges[i]; }
     private:
         Vector<UnicodeRange> m_ranges; // If empty, represents the whole code space.
     };
 
     FontFace::LoadStatus loadStatus() const { return m_fontFace->loadStatus(); }
-    void willUseFontData(const FontDescription&);
+    bool maybeScheduleFontLoad(const FontDescription&, UChar32);
     void load(const FontDescription&, CSSFontSelector* = 0);
 
     bool hadBlankText() { return isValid() && m_sources.first()->hadBlankText(); }
 
     void trace(Visitor*);
 
 private:
     void setLoadStatus(FontFace::LoadStatus);
 
     UnicodeRangeSet m_ranges;
     RawPtrWillBeMember<CSSSegmentedFontFace> m_segmentedFontFace;
     Deque<OwnPtr<CSSFontFaceSource> > m_sources;
     RawPtrWillBeMember<FontFace> m_fontFace;
 };
 
 }
 
 #endif