Close mirroring window only when necessary

ash/display/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_DISPLAY_MANAGER_H_
 #define ASH_DISPLAY_DISPLAY_MANAGER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 47 matching lines @@
       {
  public:
   class ASH_EXPORT Delegate {
    public:
     virtual ~Delegate() {}
 
     // Create or updates the mirroring window with |display_info_list|.
     virtual void CreateOrUpdateMirroringDisplay(
         const DisplayInfoList& display_info_list) = 0;
 
-    // Closes the mirror window if exists.
-    virtual void CloseMirroringDisplay() = 0;
+    // Closes the mirror window if not necessary.
+    virtual void CloseMirroringDisplayIfNotNecessary() = 0;
 
     // Called before and after the display configuration changes.
     // When |clear_focus| is true, the implementation should
     // deactivate the active window and set the focus window to NULL.
     virtual void PreDisplayConfigurationChange(bool clear_focus) = 0;
     virtual void PostDisplayConfigurationChange() = 0;
   };
 
   typedef std::vector<gfx::Display> DisplayList;
 
@@ skipping 256 matching lines @@
   bool software_mirroring_enabled() const {
     return multi_display_mode_ == MIRRORING;
   };
 
   void set_change_display_upon_host_resize(bool value) {
     change_display_upon_host_resize_ = value;
   }
 
   // Creates software mirroring display related information. The display
   // used to mirror the content is removed from the |display_info_list|.
-  void CreateSoftwareMirroringDisplay(DisplayInfoList* display_info_list);
+  void CreateSoftwareMirroringDisplayInfo(DisplayInfoList* display_info_list);
 
   gfx::Display* FindDisplayForId(int64 id);
 
   // Add the mirror display's display info if the software based
   // mirroring is in use.
   void AddMirrorDisplayInfoIfAny(DisplayInfoList* display_info_list);
 
   // Inserts and update the DisplayInfo according to the overscan
   // state. Note that The DisplayInfo stored in the |internal_display_info_|
   // can be different from |new_info| (due to overscan state), so
@@ skipping 67 matching lines @@
   gfx::Display::Rotation registered_internal_display_rotation_;
 
   base::WeakPtrFactory<DisplayManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_DISPLAY_MANAGER_H_