Adding mojo calls for several lock screen related operations.

chrome/browser/chromeos/login/lock_screen_utils.h

+// Copyright 2017 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_CHROMEOS_LOGIN_LOCK_SCREEN_UTILS_H_
+#define CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_SCREEN_UTILS_H_
+
+#include "ui/base/ime/chromeos/input_method_manager.h"
+
+class AccountId;
+
+namespace chromeos {
+namespace lock_screen_utils {
+
+// Update current input method (namely keyboard layout) in the given IME state
+// to last input method used by this user.
+void SetUserInputMethod(const std::string& username,
+                        input_method::InputMethodManager::State* ime_state);
+
+// Get user's last input method.
+std::string GetUserLastInputMethod(const std::string& username);
+
+// Update user's input method.
+bool SetUserInputMethodImpl(const std::string& username,
+                            const std::string& user_input_method,
+                            input_method::InputMethodManager::State* ime_state);
+
+// Sets the currently allowed input method, including those that are enforced
+// by policy.
+void EnforcePolicyInputMethods(std::string user_input_method);
+
+// Update the keyboard settings for |account_id|.
+void SetKeyboardSettings(const AccountId& account_id);
+
+// Returns true if found an element in |container| that equals to |value|.
+bool Contains(const std::vector<std::string>& container,

[jdufault, 2017/06/08 21:12:06]

Replace all instances of this with base::ContainsValue

[xiaoyinh(OOO Sep 11-29), 2017/06/09 00:47:11]

Done.

+              const std::string& value);
+
+}  // namespace lock_screen_utils
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_SCREEN_UTILS_H_