Move Screen, its impls, DisplayObserver and DisplayChangeNotifier to ui/display

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_