Add OnDisplayMetricsChanged in DisplayObserver.

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 "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:
-  // Called when the |display|'s bound has changed.
-  virtual void OnDisplayBoundsChanged(const Display& display) = 0;
+  enum MetricsType {

[oshima, 2014/05/08 18:06:50]

I believe the chrome style recommends EnumName -> ENUM_NAME_XXX style.
Just DisplayMetrics would be fine.

[mlamouri (slow - plz ping), 2014/05/09 16:11:39]

Done.

+    DISPLAY_METRICS_NONE = 0,
+    DISPLAY_METRICS_BOUNDS = 1 << 0,
+    DISPLAY_METRICS_ROTATION = 1 << 1,
+    DISPLAY_METRICS_WORKAREA = 1 << 2,
+  };
 
   // 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 |MetricsType|.
+  virtual void OnDisplayMetricsChanged(
+      const Display& display, MetricsType changed_metrics) = 0;
+
  protected:
   virtual ~DisplayObserver();
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_DISPLAY_OBSERVER_H_