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

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

Index: third_party/libaddressinput/chromium/cpp/src/address_field_util.cc
diff --git a/third_party/libaddressinput/chromium/cpp/src/address_field_util.cc b/third_party/libaddressinput/chromium/cpp/src/address_field_util.cc
index 553a940efd76ed748b3027594e7990bdc5fe9820..576b2a1179127acd9163cc58bfdeb2cd5f848e23 100644
--- a/third_party/libaddressinput/chromium/cpp/src/address_field_util.cc
+++ b/third_party/libaddressinput/chromium/cpp/src/address_field_util.cc
@@ -80,5 +80,17 @@ void ParseAddressFieldsFormat(const std::string& format,
   }
 }
 
+void ParseAddressFieldsRequired(const std::string& required,
+                                std::vector<AddressField>* fields) {
+  assert(fields != NULL);
+  fields->clear();
+  for (std::string::const_iterator token = required.begin();
+       token != required.end(); ++token) {
+    if (IsToken(*token)) {
+      fields->push_back(ParseToken(*token));
+    }
+  }
+}
+
 }  // namespace addressinput
 }  // namespace i18n