Return primary display if out of bounds point or NULL ponter is passed to gfx::Screen::GeDisplayNea

ash/display/display_controller.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_DISPLAY_DISPLAY_CONTROLLER_H_
 #define ASH_DISPLAY_DISPLAY_CONTROLLER_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 67 matching lines @@
 
    protected:
     virtual ~Observer() {}
   };
 
   DisplayController();
   virtual ~DisplayController();
 
   // Gets primary display. This information is stored in global
   // object as this can be accessed after Shell is closed.
-  static gfx::Display GetPrimaryDisplay();
+  static const gfx::Display& GetPrimaryDisplay();
 
   // Initializes primary display.
   void InitPrimaryDisplay();
 
   // Initialize secondary displays.
   void InitSecondaryDisplays();
 
   // Add/Remove observers.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
@@ skipping 62 matching lines @@
   std::map<std::string, DisplayLayout> secondary_layouts_;
 
   ObserverList<Observer> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_DISPLAY_CONTROLLER_H_