[ash] Preferred size of ShelfView is not fixed when item is animating

ash/shelf/shelf_view.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/shelf/shelf_view.h"
 
 #include <algorithm>
 
 #include "ash/ash_constants.h"
 #include "ash/ash_switches.h"
@@ skipping 1363 matching lines @@
 
   // When an item is dragged off from the overflow bubble, it is moved to last
   // position and and changed to invisible. Overflow bubble size should be
   // shrunk to fit only for visible items.
   if (is_overflow_mode() && dragged_off_shelf_ &&
       RemovableByRipOff(view_model_->GetIndexOfView(drag_view_)) == REMOVABLE)
     last_button_index--;
 
   const gfx::Rect last_button_bounds =
       last_button_index  >= first_visible_index_ ?
-          view_model_->view_at(last_button_index)->bounds() :
+          view_model_->ideal_bounds(last_button_index) :
           gfx::Rect(gfx::Size(preferred_size, preferred_size));
 
   if (layout_manager_->IsHorizontalAlignment()) {
     return gfx::Size(last_button_bounds.right() + leading_inset_,
                      preferred_size);
   }
 
   return gfx::Size(preferred_size,
                    last_button_bounds.bottom() + leading_inset_);
 }
@@ skipping 530 matching lines @@
       break;
     case ash::SHELF_ALIGNMENT_TOP:
       distance = coordinate.y() - bounds.bottom();
       break;
   }
   return distance > 0 ? distance : 0;
 }
 
 }  // namespace internal
 }  // namespace ash