add ash_resources.grd and necessary changes to use images in ash/resources

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 96 matching lines @@
     return default_display_layout_;
   }
   void SetDefaultDisplayLayout(const DisplayLayout& layout);
 
   // Sets/gets the display layout for the specified display name.  Getter
   // returns the default value in case it doesn't have its own layout yet.
   void SetLayoutForDisplayName(const std::string& name,
                                const DisplayLayout& layout);
   const DisplayLayout& GetLayoutForDisplayName(const std::string& name);
 
+  // Swaps primary and secondary display. This also updated DisplayLayout so that
+  // the phisical display layout does not change.
+  void SwapPrimaryAndSecondary();
+
   // aura::DisplayObserver overrides:
   virtual void OnDisplayBoundsChanged(
       const gfx::Display& display) OVERRIDE;
   virtual void OnDisplayAdded(const gfx::Display& display) OVERRIDE;
   virtual void OnDisplayRemoved(const gfx::Display& display) OVERRIDE;
 
  private:
   // Creates a root window for |display| and stores it in the |root_windows_|
   // map.
   aura::RootWindow* AddRootWindowForDisplay(const gfx::Display& display);
@@ skipping 12 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_