[Chrome OS MD] Draw a 1px separator between 2 tray items

ash/common/system/tray/system_tray.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/tray/system_tray.h"
 
 #include "ash/common/ash_switches.h"
 #include "ash/common/login_status.h"
+#include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/system/cast/tray_cast.h"
 #include "ash/common/system/date/tray_date.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
 #include "ash/common/system/tray/system_tray_item.h"
 #include "ash/common/system/tray/tray_bubble_wrapper.h"
 #include "ash/common/system/tray/tray_constants.h"
@@ skipping 601 matching lines @@
   base::HourClockType hour_type =
       WmShell::Get()->system_tray_delegate()->GetHourClockType();
   return base::TimeFormatTimeOfDayWithHourClockType(now, hour_type,
                                                     base::kKeepAmPm);
 }
 
 void SystemTray::SetShelfAlignment(ShelfAlignment alignment) {
   if (alignment == shelf_alignment())
     return;
   TrayBackgroundView::SetShelfAlignment(alignment);
+  //  if (!ash::MaterialDesignController::IsShelfMaterial())
+  //    AdjustStatusTrayBackground();

[yoshiki, 2016/08/18 08:39:08]

nit: Please remove the unnecessary code.

[yiyix, 2016/08/18 20:01:43]

sorry, I forget to remove these dead codes from my previous versions.

+
   UpdateAfterShelfAlignmentChange(alignment);
   // Destroy any existing bubble so that it is rebuilt correctly.
   CloseSystemBubbleAndDeactivateSystemTray();
   // Rebuild any notification bubble.
   if (notification_bubble_) {
     notification_bubble_.reset();
     UpdateNotificationBubble();
     // UpdateWebNotifications() should be called in UpdateNotificationBubble().
   } else if (!hide_notifications_) {
     UpdateWebNotifications();
@@ skipping 148 matching lines @@
           .work_area()
           .height();
   if (work_area_height > 0) {
     UMA_HISTOGRAM_CUSTOM_COUNTS(
         "Ash.SystemMenu.PercentageOfWorkAreaHeightCoveredByMenu",
         100 * bubble_view->height() / work_area_height, 1, 300, 100);
   }
 }
 
 }  // namespace ash