Caches the display names in MultiDisplayManager.

ash/display/multi_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 ASH_DISPLAY_MULTI_DISPLAY_MANAGER_H_
 #define ASH_DISPLAY_MULTI_DISPLAY_MANAGER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 46 matching lines @@
   bool IsActiveDisplay(const gfx::Display& display) const;
 
   // True if there is an internal display.
   bool HasInternalDisplay() const;
 
   bool IsInternalDisplayId(int64 id) const;
 
   bool UpdateWorkAreaOfDisplayNearestWindow(const aura::Window* window,
                                             const gfx::Insets& insets);
 
+  // Returns the list of currently connected display names.  It doesn't
+  // contain the name for the internal display.
+  std::vector<std::string> GetExternalDisplayNames() const;
+
   // Returns display for given |id|;
   const gfx::Display& GetDisplayForId(int64 id) const;
 
   // Finds the display that contains |point| in screeen coordinates.
   // Returns invalid display if there is no display that can satisfy
   // the condition.
   const gfx::Display& FindDisplayContainingPoint(
       const gfx::Point& point_in_screen) const;
 
   // Registers the overscan insets for the display of the specified ID. Note
@@ skipping 50 matching lines @@
   void AddDisplayFromSpec(const std::string& spec);
 
   // Set the 1st display as an internal display and returns the display Id for
   // the internal display.
   int64 SetFirstDisplayAsInternalDisplayForTest();
 
   // Checks if the mouse pointer is on one of displays, and moves to
   // the center of the nearest display if it's outside of all displays.
   void EnsurePointerInDisplays();
 
+  // Updates |display_names_| by calling platform-dependent functions.
+  void RefreshDisplayNames();
+
   // Update the display's id in the |display_list| to match the ones
   // stored in this display manager's |displays_|. This is used to
   // emulate display change behavior during the test byn creating the
   // display list with the same display ids but with different bounds
   void SetDisplayIdsForTest(DisplayList* display_list) const;
 
   DisplayList displays_;
 
   int64 internal_display_id_;
 
   // An internal display cache used when the internal display is disconnectd.
   scoped_ptr<gfx::Display> internal_display_;
 
   bool force_bounds_changed_;
 
   // The mapping from the display ID to its overscan insets.
   std::map<int64, gfx::Insets> overscan_mapping_;
 
+  // The cached display's name for the display ID.
+  std::map<int64, std::string> display_names_;
+
   DISALLOW_COPY_AND_ASSIGN(MultiDisplayManager);
 };
 
 extern const aura::WindowProperty<int64>* const kDisplayIdKey;
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_MULTI_DISPLAY_MANAGER_H_