Re-landing http://codereview.chromium.org/7014019.

src/extensions/experimental/i18n-utils.h

 // Copyright 2011 the V8 project authors. 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 10 matching lines @@
 // 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 V8_EXTENSIONS_EXPERIMENTAL_I18N_UTILS_H_
 #define V8_EXTENSIONS_EXPERIMENTAL_I18N_UTILS_H_
 
+#include "include/v8.h"
+
+#include "unicode/uversion.h"
+
+namespace U_ICU_NAMESPACE {
+class UnicodeString;
+}
+
 namespace v8 {
 namespace internal {
 
 class I18NUtils {
  public:
   // Safe string copy. Null terminates the destination. Copies at most
   // (length - 1) bytes.
   // We can't use snprintf since it's not supported on all relevant platforms.
   // We can't use OS::SNPrintF, it's only for internal code.
-  // TODO(cira): Find a way to use OS::SNPrintF instead.
   static void StrNCopy(char* dest, int length, const char* src);
 
+  // Extract a string setting named in |settings| and set it to |result|.
+  // Return true if it's specified. Otherwise, return false.
+  static bool ExtractStringSetting(const v8::Handle<v8::Object>& settings,
+                                   const char* setting,
+                                   icu::UnicodeString* result);
+
  private:
   I18NUtils() {}
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_EXTENSIONS_EXPERIMENTAL_I18N_UTILS_H_