ash: Tune shutdown animation time to 1.5s for convertible devices

ash/wm/session_state_animator.cc

 // 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.
 
 #include "ash/wm/session_state_animator.h"
 
 #include "ash/common/ash_switches.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/shell.h"
 #include "ash/wm/window_animations.h"
@@ skipping 77 matching lines @@
       return base::TimeDelta::FromMilliseconds(150);
     case ANIMATION_SPEED_FAST:
       return base::TimeDelta::FromMilliseconds(150);
     case ANIMATION_SPEED_SHOW_LOCK_SCREEN:
       return base::TimeDelta::FromMilliseconds(200);
     case ANIMATION_SPEED_MOVE_WINDOWS:
       return base::TimeDelta::FromMilliseconds(350);
     case ANIMATION_SPEED_UNDO_MOVE_WINDOWS:
       return base::TimeDelta::FromMilliseconds(350);
     case ANIMATION_SPEED_SHUTDOWN:
-      return IsTouchViewEnabled() ? base::TimeDelta::FromMilliseconds(2500)
+      return IsTouchViewEnabled() ? base::TimeDelta::FromMilliseconds(1500)
                                   : base::TimeDelta::FromMilliseconds(1000);
     case ANIMATION_SPEED_REVERT_SHUTDOWN:
       return base::TimeDelta::FromMilliseconds(500);
   }
   // Satisfy compilers that do not understand that we will return from switch
   // above anyway.
   DCHECK(false) << "Unhandled animation speed " << speed;
   return base::TimeDelta();
 }
 
 }  // namespace ash