Make hanja key customizable.

chrome/browser/chromeos/language_preferences.cc

Index: chrome/browser/chromeos/language_preferences.cc
diff --git a/chrome/browser/chromeos/language_preferences.cc b/chrome/browser/chromeos/language_preferences.cc
index aece8776f75f362c137a3c0a2cd31c644914fa25..441195595b237a40d4eee5197e2f65b7d7de7622 100644
--- a/chrome/browser/chromeos/language_preferences.cc
+++ b/chrome/browser/chromeos/language_preferences.cc
@@ -148,6 +148,10 @@ const char kHangulHanjaKeysConfigName[] = "HanjaKeys";
 // TODO: HanjaKeys are not configurable yet (and we're not sure if it should.)
 const char kHangulHanjaKeys[] = "F9,Hangul_Hanja,Control+9";
 
+// Mozc-hangul treats Hangul_Hanja key as hanja key event even if it is not set.
+const char kHangulHanjaBindingKeysConfigName[] = "HanjaKeyBindings";
+const char kHangulHanjaBindingKeys[] = "F9,Ctrl 9";
+
 const HangulKeyboardNameIDPair kHangulKeyboardNameIDPairs[] = {
   // We have to sync the |keyboard_id|s with those in
   // ibus-hangul/files/setup/main.py.