[rac] Parse postal code formats and required fields in libaddressinput.

third_party/libaddressinput/chromium/cpp/src/address_field_util.h

Index: third_party/libaddressinput/chromium/cpp/src/address_field_util.h
diff --git a/third_party/libaddressinput/chromium/cpp/src/address_field_util.h b/third_party/libaddressinput/chromium/cpp/src/address_field_util.h
index e55b9502a6b1f545edeb3708da4346e4b76efea2..334f02f4bb8ec92b8d6f534eacc822a4ae8dcc36 100644
--- a/third_party/libaddressinput/chromium/cpp/src/address_field_util.h
+++ b/third_party/libaddressinput/chromium/cpp/src/address_field_util.h
@@ -36,6 +36,12 @@ enum {
 void ParseAddressFieldsFormat(const std::string& format,
                               std::vector<AddressField>* fields);
 
+// Clears |fields|, parses |required|, and adds the required fields to |fields|.
+// For example, parses "SCDX" into {ADMIN_AREA, LOCALITY, DEPENDENT_LOCALITY,
+// SORTING_CODE}.
+void ParseAddressFieldsRequired(const std::string& required,
+                                std::vector<AddressField>* fields);
+
 }  // namespace addressinput
 }  // namespace i18n