Use persistent ID/names for displays.

ui/aura/single_display_manager.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 UI_AURA_SINGLE_DISPLAY_MANAGER_H_
 #define UI_AURA_SINGLE_DISPLAY_MANAGER_H_
 
 #include "base/compiler_specific.h"
 #include "ui/aura/aura_export.h"
 #include "ui/aura/display_manager.h"
@@ skipping 21 matching lines @@
   virtual gfx::Display* GetDisplayAt(size_t index) OVERRIDE;
 
   virtual size_t GetNumDisplays() const OVERRIDE;
 
   virtual const gfx::Display& GetDisplayNearestWindow(
       const Window* window) const OVERRIDE;
   virtual const gfx::Display& GetDisplayNearestPoint(
       const gfx::Point& point) const OVERRIDE;
   virtual const gfx::Display& GetDisplayMatching(
       const gfx::Rect& match_rect) const OVERRIDE;
+  virtual std::string GetDisplayNameAt(size_t index) OVERRIDE;
 
   // WindowObserver overrides:
   virtual void OnWindowBoundsChanged(Window* window,
                                      const gfx::Rect& old_bounds,
                                      const gfx::Rect& new_bounds) OVERRIDE;
   virtual void OnWindowDestroying(Window* window) OVERRIDE;
 
  private:
   void Init();
   void Update(const gfx::Size size);
 
   RootWindow* root_window_;
   gfx::Display display_;
 
   DISALLOW_COPY_AND_ASSIGN(SingleDisplayManager);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_SINGLE_DISPLAY_MANAGER_H_