Make hanja key customizable.

chrome/browser/chromeos/language_preferences.h

Index: chrome/browser/chromeos/language_preferences.h
diff --git a/chrome/browser/chromeos/language_preferences.h b/chrome/browser/chromeos/language_preferences.h
index 16ef9c1462842ded4432f14ff4964a8c858b6c12..33e5ede3681d95073a9c7dbc92e2531fcfb4cf62 100644
--- a/chrome/browser/chromeos/language_preferences.h
+++ b/chrome/browser/chromeos/language_preferences.h
@@ -90,13 +90,18 @@ const size_t kNumChewingMultipleChoicePrefs = 2;
 extern const LanguageMultipleChoicePreference<int> kChewingHsuSelKeyType;
 
 // ---------------------------------------------------------------------------
-// For Korean input method (ibus-hangul)
+// For Korean input method (ibus-mozc-hangul)
 // ---------------------------------------------------------------------------
 extern const char kHangulSectionName[];
 extern const char kHangulKeyboardConfigName[];
 extern const char kHangulHanjaKeysConfigName[];
 extern const char kHangulHanjaKeys[];
 
+// Following configuration is for mozc-hangul and same meaning of
+// kHangulHanjaKeys.
+extern const char kHangulHanjaBindingKeysConfigName[];
+extern const char kHangulHanjaBindingKeys[];
+
 struct HangulKeyboardNameIDPair {
   int message_id;
   const char* keyboard_id;