Revert "Revert "Reland 2: mac: Use a placeholder string for the family name of the system font." Br…

Source/platform/fonts/mac/FontFamilyMatcherMac.h

 /*
  * Copyright (C) 2006, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  *
  * 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
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef FontFamilyMatcherMac_h
 #define FontFamilyMatcherMac_h
 
+#include "platform/PlatformExport.h"
+#include "platform/fonts/FontTraits.h"
 #include <AppKit/NSFontManager.h>
 
 namespace blink {
 
-NSFont* MatchNSFontFamily(NSString* desiredFamily, NSFontTraitMask desiredTraits,
-    int desiredWeight, float size);
+PLATFORM_EXPORT NSFont* MatchNSFontFamily(NSString* desiredFamily, NSFontTraitMask desiredTraits,
+    FontWeight desiredWeight, float size);
 
+// Converts a blink::FontWeight to an AppKit font weight.
+int toAppKitFontWeight(FontWeight);
 }
 
 #endif // FontFamilyMatcherMac_h