Allow switching between extended and unified

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 279 matching lines @@
 
   // Sets/gets multi display mode.
   void SetMultiDisplayMode(MultiDisplayMode mode);
 
   // Sets/gets default multi display mode.
   void SetDefaultMultiDisplayMode(MultiDisplayMode mode);
   MultiDisplayMode default_multi_display_mode() const {
     return default_multi_display_mode_;
   }
 
+  // Reconfigure display configuration using the same
+  // physical display. TODO(oshima): Refactor and move this
+  // impl to |SetDefaultMultiDisplayMode|.
+  void ReconfigureDisplays();

[oshima, 2015/05/19 23:55:15]

I tried to keep the CL minimum to make merge easier. I'll refactor and simplify
the code once the feature is settled on 44.

+
   // Update the bounds of the display given by |display_id|.
   bool UpdateDisplayBounds(int64 display_id,
                            const gfx::Rect& new_bounds);
 
   // Creates mirror window asynchronously if the software mirror mode
   // is enabled.
   void CreateMirrorWindowAsyncIfAny();
 
   // Creates a MouseWarpController for the current display
   // configuration. |drag_source| is the window where dragging
@@ skipping 114 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_