Store the language code for the address in autofill profile.

components/autofill/core/browser/autofill_profile.h

Index: components/autofill/core/browser/autofill_profile.h
diff --git a/components/autofill/core/browser/autofill_profile.h b/components/autofill/core/browser/autofill_profile.h
index 7eb979672687fef1a9762c26645188f4ff963f6c..7bc1ff178ca60e7c84a7ad781cd3b9f593f41b71 100644
--- a/components/autofill/core/browser/autofill_profile.h
+++ b/components/autofill/core/browser/autofill_profile.h
@@ -132,6 +132,11 @@ class AutofillProfile : public AutofillDataModel {
       size_t minimal_fields_shown,
       std::vector<base::string16>* labels);
 
+  const std::string& language_code() const { return language_code_; }
+  void set_language_code(const std::string& language_code) {
+    language_code_ = language_code;
+  }
+
  private:
   typedef std::vector<const FormGroup*> FormGroupList;
 
@@ -185,6 +190,7 @@ class AutofillProfile : public AutofillDataModel {
   CompanyInfo company_;
   std::vector<PhoneNumber> phone_number_;
   Address address_;
+  std::string language_code_;
 };
 
 // So we can compare AutofillProfiles with EXPECT_EQ().