Default to current UI locale when recommended locales are invalid

chrome/browser/ui/webui/chromeos/login/l10n_util.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_L10N_UTIL_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_L10N_UTIL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 19 matching lines @@
 // dictionary that contains data such as the language's locale code and a
 // display name. The list will consist of the |most_relevant_language_codes|,
 // followed by a divider and all other supported languages after that. If
 // |most_relevant_language_codes| is NULL, the most relevant languages are read
 // from initial_locale in VPD. If |selected| matches the locale code of any
 // entry in the resulting list, that entry will be marked as selected.
 scoped_ptr<base::ListValue> GetUILanguageList(
     const std::vector<std::string>* most_relevant_language_codes,
     const std::string& selected);
 
+// Returns the most first entry of |most_relevant_language_codes| that is
+// actually available (present in |available_locales|). If none of the entries
+// are present in |available_locales|, returns the |fallback_locale|.
+std::string FindMostRelevantLocale(
+    const std::vector<std::string>& most_relevant_language_codes,
+    const base::ListValue& available_locales,
+    const std::string& fallback_locale);
+
 // Return a list of supported accept languages. The listed languages can be used
 // in the Accept-Language header. The return value will look like:
 // [{'code': 'fi', 'displayName': 'Finnish', 'nativeDisplayName': 'suomi'}, ...]
 // The most relevant languages, read from initial_locale in VPD, will be first
 // in the list.
 scoped_ptr<base::ListValue> GetAcceptLanguageList();
 
 // Return a list of keyboard layouts that can be used for |locale| on the login
 // screen. Each list entry is a dictionary that contains data such as an ID and
 // a display name. The list will consist of the device's hardware layouts,
@@ skipping 19 matching lines @@
     const GetKeyboardLayoutsForLocaleCallback& callback,
     const std::string& locale);
 
 // Returns the current keyboard layout, expressed as a dictionary that contains
 // data such as an ID and a display name.
 scoped_ptr<base::DictionaryValue> GetCurrentKeyboardLayout();
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_L10N_UTIL_H_