cros: Move wallpaper after login screen is gone

chrome/browser/chromeos/login/ui/login_display_host_impl.h

 // Copyright 2014 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_CHROMEOS_LOGIN_UI_LOGIN_DISPLAY_HOST_IMPL_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_UI_LOGIN_DISPLAY_HOST_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 45 matching lines @@
  public:
   explicit LoginDisplayHostImpl(const gfx::Rect& wallpaper_bounds);
   ~LoginDisplayHostImpl() override;
 
   // LoginDisplayHost implementation:
   LoginDisplay* CreateLoginDisplay(LoginDisplay::Delegate* delegate) override;
   gfx::NativeWindow GetNativeWindow() const override;
   OobeUI* GetOobeUI() const override;
   WebUILoginView* GetWebUILoginView() const override;
   void BeforeSessionStart() override;
-  void Finalize() override;
+  void Finalize(base::OnceClosure completion_callback) override;
   void OpenProxySettings() override;
   void SetStatusAreaVisible(bool visible) override;
   void StartWizard(OobeScreen first_screen) override;
   WizardController* GetWizardController() override;
   AppLaunchController* GetAppLaunchController() override;
-  void StartUserAdding(const base::Closure& completion_callback) override;
+  void StartUserAdding(base::OnceClosure completion_callback) override;
   void CancelUserAdding() override;
   void StartSignInScreen(const LoginScreenContext& context) override;
   void OnPreferencesChanged() override;
   void PrewarmAuthentication() override;
   void StartAppLaunch(
       const std::string& app_id,
       bool diagnostic_mode,
       bool auto_launch) override;
   void StartDemoAppLaunch() override;
   void StartArcKiosk(const AccountId& account_id) override;
@@ skipping 180 matching lines @@
 
   // How many times renderer has crashed.
   int crash_count_ = 0;
 
   // Way to restore if renderer have crashed.
   RestorePath restore_path_ = RESTORE_UNKNOWN;
 
   // Stored parameters for StartWizard, required to restore in case of crash.
   OobeScreen first_screen_;
 
-  // Called before host deletion.
-  base::Closure completion_callback_;
+  // Called after host deletion.
+  std::vector<base::OnceClosure> completion_callbacks_;
 
   // Active instance of authentication prewarmer.
   std::unique_ptr<AuthPrewarmer> auth_prewarmer_;
 
   // A focus ring controller to draw focus ring around view for keyboard
   // driven oobe.
   std::unique_ptr<FocusRingController> focus_ring_controller_;
 
   // Handles special keys for keyboard driven oobe.
   std::unique_ptr<KeyboardDrivenOobeKeyHandler>
@@ skipping 21 matching lines @@
 
   base::WeakPtrFactory<LoginDisplayHostImpl> pointer_factory_;
   base::WeakPtrFactory<LoginDisplayHostImpl> animation_weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LoginDisplayHostImpl);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_UI_LOGIN_DISPLAY_HOST_IMPL_H_