Update shelf spacing in Chrome OS according to the MD specs

ash/system/status_area_widget_delegate.h

 // 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.
 
 #ifndef ASH_SYSTEM_STATUS_AREA_WIDGET_DELEGATE_H_
 #define ASH_SYSTEM_STATUS_AREA_WIDGET_DELEGATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/shelf/shelf_types.h"
 #include "ash/wm/gestures/shelf_gesture_handler.h"
@@ skipping 37 matching lines @@
   void DeleteDelegate() override;
 
  protected:
   // Overridden from views::View:
   void ChildPreferredSizeChanged(views::View* child) override;
   void ChildVisibilityChanged(views::View* child) override;
 
  private:
   void UpdateWidgetSize();
 
+  // Sets a border on |child|. If |extend_border_to_edge| is true, then an extra
+  // wide border is added to extend the view's hit region to the edge of the
+  // screen.
+  void SetBorderOnChild(views::View* child, bool extend_border_to_edge);
+
   const FocusCycler* focus_cycler_for_testing_;
   ShelfAlignment alignment_;
 
   ShelfGestureHandler gesture_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(StatusAreaWidgetDelegate);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_STATUS_AREA_WIDGET_DELEGATE_H_