Improve getFallbackFamily() for Unified Han Ideographs on Windows

Source/platform/fonts/win/FontFallbackWin.h

 /*
  * Copyright (c) 2006, 2007, 2008, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * 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 FontFallbackWin_h
 #define FontFallbackWin_h
 
 #include "platform/PlatformExport.h"
 #include "platform/fonts/FontDescription.h"
+#include <unicode/locid.h>
 #include <unicode/uscript.h>
 #include <usp10.h>
 #include <wchar.h>
 #include <windows.h>
 
 class SkFontMgr;
 
 namespace blink {
 
 // Return a font family that can render |character| based on what script
 // that characters belong to.
 // When scriptChecked is non-zero, the script used to determine
 // the family is returned.
 PLATFORM_EXPORT const UChar* getFallbackFamily(UChar32 character,
     FontDescription::GenericFamilyType,
     UScriptCode* scriptChecked,
     SkFontMgr* fontManager);
+PLATFORM_EXPORT UScriptCode scriptCodeForUnifiedHanFromLocale(const icu::Locale&);
 
 } // namespace blink
 
 #endif // FontFallbackWin_h