Fix shelf layout when switching from left-aligned shelf to right-aligned shelf

ash/common/system/status_area_widget_delegate.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/common/system/status_area_widget_delegate.h"
 
 #include "ash/ash_export.h"
 #include "ash/common/ash_switches.h"
 #include "ash/common/focus_cycler.h"
 #include "ash/common/material_design/material_design_controller.h"
@@ skipping 213 matching lines @@
     } else {  // SHELF_ALIGNMENT_RIGHT
       top_edge = 0;
       left_edge = kShelfItemInset;
       bottom_edge =
           on_edge ? GetTrayConstant(TRAY_PADDING_FROM_EDGE_OF_SHELF) : 0;
       right_edge = shelf_size - kShelfItemInset - item_height;
     }
   }
   child->SetBorder(views::Border::CreateEmptyBorder(top_edge, left_edge,
                                                     bottom_edge, right_edge));
+  // Layout on |child| needs to be updated based on new border value before
+  // displaying; otherwise |child| will be showing with old border size.
+  // Fix for crbug.com/623438.
+  child->Layout();
 }
 
 }  // namespace ash