Use unicode-range to prevent unnecessary @font-face donwnloads

Source/core/platform/graphics/FontFallbackList.h

 /*
  * Copyright (C) 2006, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 55 matching lines @@
     };
 
     static PassRefPtr<FontFallbackList> create() { return adoptRef(new FontFallbackList()); }
 
     ~FontFallbackList() { releaseFontData(); }
     void invalidate(PassRefPtr<FontSelector>);
 
     bool isFixedPitch(const Font* f) const { if (m_pitch == UnknownPitch) determinePitch(f); return m_pitch == FixedPitch; };
     void determinePitch(const Font*) const;
 
-    bool loadingCustomFonts() const { return m_loadingCustomFonts; }
+    bool loadingCustomFonts() const;
 
     FontSelector* fontSelector() const { return m_fontSelector.get(); }
     // FIXME: It should be possible to combine fontSelectorVersion and generation.
     unsigned fontSelectorVersion() const { return m_fontSelectorVersion; }
     unsigned generation() const { return m_generation; }
 
     WidthCache& widthCache() const { return m_widthCache; }
 
 private:
     FontFallbackList();
 
     const SimpleFontData* primarySimpleFontData(const Font* f)
     {
         ASSERT(isMainThread());
-        if (!m_cachedPrimarySimpleFontData)
+        if (!m_cachedPrimarySimpleFontData) {
             m_cachedPrimarySimpleFontData = primaryFontData(f)->fontDataForCharacter(' ');
+            if (m_cachedPrimarySimpleFontData)
+                m_cachedPrimarySimpleFontData->beginLoadIfNeeded();
+        }
         return m_cachedPrimarySimpleFontData;
     }
 
     const FontData* primaryFontData(const Font* f) const { return fontDataAt(f, 0); }
     const FontData* fontDataAt(const Font*, unsigned index) const;
 
     void setPlatformFont(const FontPlatformData&);
 
     void releaseFontData();
 
     mutable Vector<RefPtr<FontData>, 1> m_fontList;
     mutable GlyphPages m_pages;
     mutable GlyphPageTreeNode* m_pageZero;
     mutable const SimpleFontData* m_cachedPrimarySimpleFontData;
     RefPtr<FontSelector> m_fontSelector;
     mutable WidthCache m_widthCache;
     unsigned m_fontSelectorVersion;
     mutable int m_familyIndex;
     unsigned short m_generation;
     mutable unsigned m_pitch : 3; // Pitch
     mutable bool m_loadingCustomFonts : 1;
 
     friend class Font;
 };
 
 }
 
 #endif