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

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 81 matching lines @@
   void platformInit();
 
   PassRefPtr<SimpleFontData> getFontData(const FontDescription&,
                                          const AtomicString&,
                                          bool checkingAlternateName = false,
                                          ShouldRetain = Retain);
   PassRefPtr<SimpleFontData> getLastResortFallbackFont(const FontDescription&,
                                                        ShouldRetain = Retain);
   SimpleFontData* getNonRetainedLastResortFallbackFont(const FontDescription&);
   bool isPlatformFontAvailable(const FontDescription&, const AtomicString&);
+  static String firstAvailableOrFirst(const String&);
 
   // Returns the ShapeCache instance associated with the given cache key.
   // Creates a new instance as needed and as such is guaranteed not to return
   // a nullptr. Instances are managed by FontCache and are only guaranteed to
   // be valid for the duration of the current session, as controlled by
   // disable/enablePurging.
   ShapeCache* getShapeCache(const FallbackListCompositeKey&);
 
   void addClient(FontCacheClient*);
 
@@ skipping 159 matching lines @@
   WTF_MAKE_NONCOPYABLE(FontCachePurgePreventer);
 
  public:
   FontCachePurgePreventer() { FontCache::fontCache()->disablePurging(); }
   ~FontCachePurgePreventer() { FontCache::fontCache()->enablePurging(); }
 };
 
 }  // namespace blink
 
 #endif