mash: Run pre-unlock animation via SessionController

ash/wm/lock_state_controller.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_WM_LOCK_STATE_CONTROLLER_H_
 #define ASH_WM_LOCK_STATE_CONTROLLER_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 94 matching lines @@
   // Called when Chrome gets a request to display the lock screen.
   void OnStartingLock();
 
   // Displays the shutdown animation and requests a system shutdown or system
   // restart depending on the the state of the |RebootOnShutdown| device policy.
   void RequestShutdown();
 
   // Called when ScreenLocker is ready to close, but not yet destroyed.
   // Can be used to display "hiding" animations on unlock.
   // |callback| will be called when all animations are done.
-  void OnLockScreenHide(base::Closure& callback);
+  void OnLockScreenHide(base::Closure callback);
 
   // Sets up the callback that should be called once lock animation is finished.
   // Callback is guaranteed to be called once and then discarded.
   void SetLockScreenDisplayedCallback(const base::Closure& callback);
 
   // aura::WindowTreeHostObserver override:
   void OnHostCloseRequested(const aura::WindowTreeHost* host) override;
 
   // ShellObserver overrides:
   void OnAppTerminating() override;
@@ skipping 117 matching lines @@
   base::Closure lock_screen_displayed_callback_;
 
   base::WeakPtrFactory<LockStateController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LockStateController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_LOCK_STATE_CONTROLLER_H_