Have OobeUI handle display observation

chrome/browser/ui/webui/chromeos/login/oobe_ui.h

 // Copyright (c) 2011 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 CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_OOBE_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_OOBE_UI_H_
 
 #include <map>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
 #include "chrome/browser/chromeos/login/oobe_screen.h"
 #include "chrome/browser/chromeos/settings/shutdown_policy_handler.h"
 #include "chrome/browser/ui/webui/chromeos/login/base_screen_handler.h"
 #include "chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h"
 #include "content/public/browser/web_ui_controller.h"
+#include "ui/display/display_observer.h"
 
 namespace ash {
 class ScreenDimmer;
 }
 
 namespace base {
 class DictionaryValue;
 }  // namespace base
 
 namespace chromeos {
@@ skipping 29 matching lines @@
 class UserBoardView;
 class UserImageView;
 class UpdateView;
 class WrongHWIDScreenView;
 
 // A custom WebUI that defines datasource for out-of-box-experience (OOBE) UI:
 // - welcome screen (setup language/keyboard/network).
 // - eula screen (CrOS (+ OEM) EULA content/TPM password/crash reporting).
 // - update screen.
 class OobeUI : public content::WebUIController,
+               public display::DisplayObserver,
                public ShutdownPolicyHandler::Delegate {
  public:
   // List of known types of OobeUI. Type added as path in chrome://oobe url, for
   // example chrome://oobe/user-adding.
   static const char kOobeDisplay[];
   static const char kLoginDisplay[];
   static const char kLockDisplay[];
   static const char kUserAddingDisplay[];
   static const char kAppLaunchSplashDisplay[];
   static const char kArcKioskSplashDisplay[];
@@ skipping 31 matching lines @@
   AppLaunchSplashScreenView* GetAppLaunchSplashScreenView();
   ArcKioskSplashScreenView* GetArcKioskSplashScreenView();
   HIDDetectionView* GetHIDDetectionView();
   ControllerPairingScreenView* GetControllerPairingScreenView();
   HostPairingScreenView* GetHostPairingScreenView();
   DeviceDisabledScreenView* GetDeviceDisabledScreenView();
   EncryptionMigrationScreenView* GetEncryptionMigrationScreenView();
   GaiaView* GetGaiaScreenView();
   UserBoardView* GetUserBoardView();
 
+  // Overridden from display::DisplayObserver:
+  void OnDisplayAdded(const display::Display& new_display) override;
+  void OnDisplayRemoved(const display::Display& old_display) override;
+  void OnDisplayMetricsChanged(const display::Display& display,
+                               uint32_t changed_metrics) override;
+
   // ShutdownPolicyHandler::Delegate
   void OnShutdownPolicyChanged(bool reboot_on_shutdown) override;
 
   // Collects localized strings from the owned handlers.
   void GetLocalizedStrings(base::DictionaryValue* localized_strings);
 
   // Initializes the handlers.
   void InitializeHandlers();
 
   // Called when the screen has changed.
@@ skipping 112 matching lines @@
   // Store the deferred JS calls before the screen handler instance is
   // initialized.
   std::unique_ptr<JSCallsContainer> js_calls_container;
 
   DISALLOW_COPY_AND_ASSIGN(OobeUI);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_OOBE_UI_H_