Add NormalizeLanguageCode() to normalize language codes.

chrome/browser/chromeos/options/language_config_view_test.cc

 // Copyright (c) 2010 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.
 
 #include "chrome/browser/chromeos/options/language_config_view.h"
 #include <string>
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace chromeos {
 
 TEST(LanguageConfigViewTest, MaybeRewriteLanguageName) {
   EXPECT_EQ(L"English",
             LanguageConfigView::MaybeRewriteLanguageName(L"English"));
   EXPECT_EQ(L"Others",
             LanguageConfigView::MaybeRewriteLanguageName(L"t"));
 }
 
+TEST(LanguageConfigViewTest, NormalizeLanguageCode) {
+  // TODO(yusukes): test all language codes that IBus provides.
+  EXPECT_EQ("jpn",
+            LanguageConfigView::NormalizeLanguageCode("ja"));
+  EXPECT_EQ("jpn",
+            LanguageConfigView::NormalizeLanguageCode("jpn"));
+  EXPECT_EQ("t",
+            LanguageConfigView::NormalizeLanguageCode("t"));
+  EXPECT_EQ("zh_CN",
+            LanguageConfigView::NormalizeLanguageCode("zh_CN"));
+}
+
 }  // namespace chromeos