Add a pref checkbox to enable/disable screen lock for ChromeOs.

chrome/browser/chromeos/cros/mock_power_library.h

 // Copyright (c) 2010 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_CROS_MOCK_POWER_LIBRARY_H_
 #define CHROME_BROWSER_CHROMEOS_CROS_MOCK_POWER_LIBRARY_H_
 #pragma once
 
 #include "chrome/browser/chromeos/cros/power_library.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace chromeos {
 
 class MockPowerLibrary : public PowerLibrary {
  public:
   MockPowerLibrary() {}
   virtual ~MockPowerLibrary() {}
   MOCK_METHOD1(AddObserver, void(Observer*));
   MOCK_METHOD1(RemoveObserver, void(Observer*));
 
   MOCK_CONST_METHOD0(line_power_on, bool(void));
   MOCK_CONST_METHOD0(battery_fully_charged, bool(void));
   MOCK_CONST_METHOD0(battery_percentage, double(void));
   MOCK_CONST_METHOD0(battery_is_present, bool(void));
   MOCK_CONST_METHOD0(battery_time_to_empty, base::TimeDelta(void));
   MOCK_CONST_METHOD0(battery_time_to_full, base::TimeDelta(void));
+
+  MOCK_METHOD1(EnableScreenLock, void(bool));
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CROS_MOCK_POWER_LIBRARY_H_