Store the language code for the address in autofill profile.

sync/protocol/autofill_specifics.proto

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Sync protocol datatype extension for autofill.
 
 // Update proto_value_conversions{.h,.cc,_unittest.cc} if you change
 // any fields in this file.
 
 syntax = "proto2";
@@ skipping 22 matching lines @@
   optional string address_home_line2 = 8;
   optional string address_home_city = 9;
   optional string address_home_state = 10;
   optional string address_home_zip = 11;
   optional string address_home_country = 12;
 
   // Additional address fields for i18n.
   optional string address_home_street_address = 17;
   optional string address_home_sorting_code = 18;
   optional string address_home_dependent_locality = 19;
+  optional string address_home_language_code = 20;
 
   // Phone.
   repeated string phone_home_whole_number = 13;
 
   // Deprecated.
   optional string label = 1 [deprecated=true];
   optional string phone_fax_whole_number = 14 [deprecated=true];
 }
 
 message AutofillSpecifics {
   // If any of these 3 fields are present, then all 3 should be, and it implies
   // that this entity represents a classic autofill object.  In this case,
   // none of the autofill++ objects below should be present.
   optional string name = 1;
   optional string value = 2;
   repeated int64 usage_timestamp = 3;
 
   // An autofill++ profile object.  If present, indicates this entity
   // represents an AutofillProfile exclusively, and no other fields (such as
   // name/value or credit_card) should be present.
   optional AutofillProfileSpecifics profile = 4;
 
   // Obsolete credit card fields.
   // optional bytes deprecated_encrypted_credit_card = 5;
   // optional AutofillCreditCardSpecifics deprecated_credit_card = 6;
 }