Move DisplayChangeObserver + tests from ash to ui.

ash/display/display_change_observer_chromeos.h

-// Copyright 2013 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_CHANGE_OBSERVER_CHROMEOS_H_
-#define ASH_DISPLAY_DISPLAY_CHANGE_OBSERVER_CHROMEOS_H_
-
-#include <stdint.h>
-
-#include <memory>
-#include <vector>
-
-#include "ash/ash_export.h"
-#include "base/macros.h"
-#include "ui/display/chromeos/display_configurator.h"
-#include "ui/display/manager/display_string_provider.h"
-#include "ui/display/manager/managed_display_info.h"
-#include "ui/events/devices/input_device_event_observer.h"
-
-namespace display {
-class DisplayManager;
-}
-
-namespace ash {
-
-class DisplaySnapshot;
-
-// An object that observes changes in display configuration and updates
-// DisplayManager.
-class DisplayChangeObserver : public ui::DisplayConfigurator::StateController,
-                              public ui::DisplayConfigurator::Observer,
-                              public ui::InputDeviceEventObserver {
- public:
-  // Returns the mode list for internal display.
-  ASH_EXPORT static display::ManagedDisplayInfo::ManagedDisplayModeList
-  GetInternalManagedDisplayModeList(
-      const display::ManagedDisplayInfo& display_info,
-      const ui::DisplaySnapshot& output);
-
-  // Returns the resolution list.
-  ASH_EXPORT static display::ManagedDisplayInfo::ManagedDisplayModeList
-  GetExternalManagedDisplayModeList(const ui::DisplaySnapshot& output);
-
-  explicit DisplayChangeObserver(
-      std::unique_ptr<display::DisplayStringProvider> string_provider);
-  ~DisplayChangeObserver() override;
-
-  void set_display_manager(display::DisplayManager* display_manager) {
-    display_manager_ = display_manager;
-  }
-
-  void set_display_configurator(ui::DisplayConfigurator* display_configurator) {
-    display_configurator_ = display_configurator;
-  }
-
-  // ui::DisplayConfigurator::StateController overrides:
-  ui::MultipleDisplayState GetStateForDisplayIds(
-      const ui::DisplayConfigurator::DisplayStateList& outputs) const override;
-  bool GetResolutionForDisplayId(int64_t display_id,
-                                 gfx::Size* size) const override;
-
-  // Overriden from ui::DisplayConfigurator::Observer:
-  void OnDisplayModeChanged(
-      const ui::DisplayConfigurator::DisplayStateList& outputs) override;
-  void OnDisplayModeChangeFailed(
-      const ui::DisplayConfigurator::DisplayStateList& displays,
-      ui::MultipleDisplayState failed_new_state) override;
-
-  // Overriden from ui::InputDeviceEventObserver:
-  void OnTouchscreenDeviceConfigurationChanged() override;
-
-  // Exposed for testing.
-  ASH_EXPORT static float FindDeviceScaleFactor(float dpi);
-
- private:
-  std::unique_ptr<display::DisplayStringProvider> string_provider_;
-  display::DisplayManager* display_manager_ = nullptr;
-  ui::DisplayConfigurator* display_configurator_ = nullptr;
-
-  DISALLOW_COPY_AND_ASSIGN(DisplayChangeObserver);
-};
-
-}  // namespace ash
-
-#endif  // ASH_DISPLAY_DISPLAY_CHANGE_OBSERVER_CHROMEOS_H_