Fix scriptCodeForHanFromSubtags() may return non-Han scripts

third_party/WebKit/Source/platform/text/LocaleToScriptMapping.h

 /*
  * Copyright (C) 2011 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 26 matching lines @@
 
 #include <unicode/uscript.h>
 
 namespace blink {
 
 PLATFORM_EXPORT UScriptCode localeToScriptCodeForFontSelection(const String&);
 PLATFORM_EXPORT UScriptCode scriptNameToCode(const String&);
 
 PLATFORM_EXPORT UScriptCode scriptCodeForHanFromSubtags(const String&, char delimiter = '-');
 
+inline bool isUnambiguousHanScript(UScriptCode script)
+{
+    // localeToScriptCodeForFontSelection() does not return these values.
+    DCHECK(script != USCRIPT_HIRAGANA && script != USCRIPT_KATAKANA);
+    return script == USCRIPT_KATAKANA_OR_HIRAGANA
+        || script == USCRIPT_SIMPLIFIED_HAN
+        || script == USCRIPT_TRADITIONAL_HAN
+        || script == USCRIPT_HANGUL;
+}
+
 }
 
 #endif