Guest Mode: input method should default to the underlying latin keyboard layout.

chrome/browser/chromeos/base/locale_util.h

 // Copyright 2013 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.
 
 // This file contains utility functions for locale change.
 
 #ifndef CHROME_BROWSER_CHROMEOS_BASE_LOCALE_UTIL_H_
 #define CHROME_BROWSER_CHROMEOS_BASE_LOCALE_UTIL_H_
 
 #include <string>
@@ skipping 19 matching lines @@
 // (const std::string* locale, const std::string* loaded_locale, bool success)
 typedef base::Callback<void(const std::string&, const std::string&, bool)>
     SwitchLanguageCallback;
 
 // This function updates input methods only if requested. In general you want
 // "enableLocaleKeyboardLayouts=true".
 // Note: in case of "enableLocaleKeyboardLayouts=false" the input
 // method currently in use may not be supported by the new locale. (i.e.
 // using new locale with unsupported input method may lead to undefined
 // behavior; use "enableLocaleKeyboardLayouts=false" with caution)
+// Note2: login_layouts_only=true enables only login-capable layouts.
 void SwitchLanguage(const std::string& locale,
-                    bool enableLocaleKeyboardLayouts,
+                    const bool enableLocaleKeyboardLayouts,
+                    const bool login_layouts_only,
                     scoped_ptr<SwitchLanguageCallback> callback);
 
 }  // namespace locale_util
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_BASE_LOCALE_UTIL_H_