Fix moving the mouse between two displays after the secondary display becomes primary.

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 207 matching lines @@
   void SetColorCalibrationProfile(int64_t display_id,
                                   ui::ColorCalibrationProfile profile);
 
   // Called when display configuration has changed. The new display
   // configurations is passed as a vector of Display object, which
   // contains each display's new infomration.
   void OnNativeDisplaysChanged(
       const std::vector<DisplayInfo>& display_info_list);
 
   // Updates the internal display data and notifies observers about the changes.
-  void UpdateDisplays(const std::vector<DisplayInfo>& display_info_list);
+  void UpdateDisplaysTo(const std::vector<DisplayInfo>& display_info_list);

[oshima, 2016/01/25 23:47:36]

This is a bit misleading as the configured displays may or may not be same as
passed info. If you want to change, UpdateDisplaysWith would be better.

[jdufault, 2016/01/26 18:37:03]

Done.

 
   // Updates current displays using current |display_info_|.
   void UpdateDisplays();
 
   // Returns the display at |index|. The display at 0 is
   // no longer considered "primary".
   const gfx::Display& GetDisplayAt(size_t index) const;
 
   const gfx::Display& GetPrimaryDisplayCandidate() const;
 
@@ skipping 209 matching lines @@
   bool unified_desktop_enabled_;
 
   base::WeakPtrFactory<DisplayManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_DISPLAY_MANAGER_H_