Notify primary display reassignment

ui/gfx/display_observer.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 UI_GFX_DISPLAY_OBSERVER_H_
 #define UI_GFX_DISPLAY_OBSERVER_H_
 
 #include <stdint.h>
 
 #include "ui/gfx/gfx_export.h"
 
 namespace gfx {
 class Display;
 
 // Observers for display configuration changes.
 // TODO(oshima): consolidate |WorkAreaWatcherObserver| and
 // |DisplaySettingsProvier|. crbug.com/122863.
 class GFX_EXPORT DisplayObserver {
  public:
   enum DisplayMetric {
     DISPLAY_METRIC_NONE = 0,
     DISPLAY_METRIC_BOUNDS = 1 << 0,
     DISPLAY_METRIC_WORK_AREA = 1 << 1,
     DISPLAY_METRIC_DEVICE_SCALE_FACTOR = 1 << 2,
     DISPLAY_METRIC_ROTATION = 1 << 3,
+    DISPLAY_METRIC_PRIMARY = 1 << 4,
   };
 
   // Called when |new_display| has been added.
   virtual void OnDisplayAdded(const Display& new_display) = 0;
 
   // Called when |old_display| has been removed.
   virtual void OnDisplayRemoved(const Display& old_display) = 0;
 
   // Called when a |display| has one or more metrics changed. |changed_metrics|
   // will contain the information about the change, see |DisplayMetric|.
   virtual void OnDisplayMetricsChanged(const Display& display,
                                        uint32_t changed_metrics) = 0;
 
  protected:
   virtual ~DisplayObserver();
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_DISPLAY_OBSERVER_H_