Save and restore unified mode

ash/display/display_layout_store.h

 // Copyright 2013 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_LAYOUT_STORE_H_
 #define ASH_DISPLAY_DISPLAY_LAYOUT_STORE_H_
 
 #include <map>
 
 #include "ash/ash_export.h"
@@ skipping 19 matching lines @@
   // If no layout is registered, it creatas new layout using
   // |default_display_layout_|.
   DisplayLayout GetRegisteredDisplayLayout(const DisplayIdPair& pair);
 
   // Returns the display layout for the display id pair
   // with display swapping applied.  That is, this returns
   // flipped layout if the displays are swapped.
   DisplayLayout ComputeDisplayLayoutForDisplayIdPair(
       const DisplayIdPair& display_pair);
 
-  // Update the mirrored flag in the display layout for
+  // Update the multi display state in the display layout for
   // |display_pair|.  This creates new display layout if no layout is
   // registered for |display_pair|.
-  void UpdateMirrorStatus(const DisplayIdPair& display_pair,
-                          bool mirrored);
+  void UpdateMultiDisplayState(const DisplayIdPair& display_pair,
+                               bool mirrored,
+                               bool default_unified);
 
   // Update the |primary_id| in the display layout for
   // |display_pair|.  This creates new display layout if no layout is
   // registered for |display_pair|.
   void UpdatePrimaryDisplayId(const DisplayIdPair& display_pair,
                               int64 display_id);
 
  private:
   // Creates new layout for display pair from |default_display_layout_|.
   DisplayLayout CreateDisplayLayout(const DisplayIdPair& display_pair);
 
   // The default display layout.
   DisplayLayout default_display_layout_;
 
   // Display layout per pair of devices.
   std::map<DisplayIdPair, DisplayLayout> paired_layouts_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayLayoutStore);
 };
 
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_DISPLAY_LAYOUT_STORE_H_