Save and restore unified mode

ash/test/display_manager_test_api.h

 // Copyright (c) 2012 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 ASH_TEST_DISPLAY_MANAGER_TEST_API_H_
 #define ASH_TEST_DISPLAY_MANAGER_TEST_API_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 15 matching lines @@
 
 namespace test {
 
 class DisplayManagerTestApi {
  public:
   // Test if moving a mouse to |point_in_screen| warps it to another
   // display.
   static bool TestIfMouseWarpsAt(ui::test::EventGenerator& event_generator,
                                  const gfx::Point& point_in_screen);
 
+  static void EnableUnifiedDesktopForTest();
+
   explicit DisplayManagerTestApi(DisplayManager* display_manager);
   virtual ~DisplayManagerTestApi();
 
   // Update the display configuration as given in |display_specs|. The format of
   // |display_spec| is a list of comma separated spec for each displays. Please
   // refer to the comment in |ash::DisplayInfo::CreateFromSpec| for the format
   // of the display spec.
   void UpdateDisplay(const std::string& display_specs);
 
   // Set the 1st display as an internal display and returns the display Id for
@@ skipping 15 matching lines @@
  private:
   DisplayManager* display_manager_;  // not owned
 
   DISALLOW_COPY_AND_ASSIGN(DisplayManagerTestApi);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_DISPLAY_MANAGER_TEST_API_H_