Allow the default generic font family settings to find the first available font

ui/gfx/font_list.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_GFX_FONT_LIST_H_
 #define UI_GFX_FONT_LIST_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 146 matching lines @@
 
   // Returns the font weight.
   Font::Weight GetFontWeight() const;
 
   // Returns the Font vector.
   const std::vector<Font>& GetFonts() const;
 
   // Returns the first font in the list.
   const Font& GetPrimaryFont() const;
 
+  // Returns the first available font name. If there is no available font,
+  // returns the first font name. Empty entries are ignored.
+  // Used by Blink and webui to pick the primary standard/serif/sans/fixed/etc.
+  // fonts from region-specific IDS lists.
+  static std::string FirstAvailableOrFirst(const std::string& font_name_list);
+
  private:
   explicit FontList(FontListImpl* impl);
 
   static const scoped_refptr<FontListImpl>& GetDefaultImpl();
 
   scoped_refptr<FontListImpl> impl_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_FONT_LIST_H_