Add NormalizeLanguageCode() to normalize language codes.

chrome/browser/chromeos/options/language_config_view_test.cc

Index: chrome/browser/chromeos/options/language_config_view_test.cc
diff --git a/chrome/browser/chromeos/options/language_config_view_test.cc b/chrome/browser/chromeos/options/language_config_view_test.cc
index eaea4271d4f1b4d0b5d1946cd5d84788f2aafde8..7ee0946be232effb4c01afc9e92c1e02d7738427 100644
--- a/chrome/browser/chromeos/options/language_config_view_test.cc
+++ b/chrome/browser/chromeos/options/language_config_view_test.cc
@@ -15,4 +15,16 @@ TEST(LanguageConfigViewTest, MaybeRewriteLanguageName) {
             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