Add EnableInputMethodsAndKeyboardLayouts function

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 69d8313c2f14e226582fc5c9c65bbacff6b05361..93a266fbefd93649adbffbbf281a3ed75e1e4e32 100644
--- a/chrome/browser/chromeos/language_preferences.h
+++ b/chrome/browser/chromeos/language_preferences.h
@@ -392,6 +392,11 @@ const size_t kNumMozcIntegerPrefs = ARRAYSIZE_UNSAFE(kMozcIntegerPrefs);
 
 // For Traditional Chinese input methods (ibus-pinyin-bopomofo and ibus-chewing)
 // TODO(yusukes): Add constants for Traditional Chinese input methods.
+
+// A input method name that corresponds the hardware keyboard layout.
+// TODO(yusukes): just assuming US qwerty keyboard is not always correct.
+const char kHardwareKeyboardLayout[] = "xkb:us::eng";
+
 }  // chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LANGUAGE_PREFERENCES_H_