Fix system tray focus on locked state screen

ash/common/system/tray/tray_background_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/common/system/tray/tray_background_view.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/shelf/shelf_constants.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/shelf/wm_shelf_util.h"
@@ skipping 520 matching lines @@
     SchedulePaint();
   }
 }
 
 void TrayBackgroundView::SetSeparatorVisibility(bool is_shown) {
   is_separator_visible_ = is_shown;
   SchedulePaint();
 }
 
 void TrayBackgroundView::OnPaint(gfx::Canvas* canvas) {
+  ActionableView::OnPaint(canvas);
   if (!MaterialDesignController::IsShelfMaterial() ||
       shelf()->GetBackgroundType() ==
           ShelfBackgroundType::SHELF_BACKGROUND_DEFAULT ||
       !is_separator_visible_) {
     return;
   }
   // In the given |canvas|, draws a 1x32px separator line 4 pixel to the right
   // of the TrayBackgroundView.
   const bool horizontal_shelf = IsHorizontalAlignment(shelf_alignment_);
   const gfx::Rect local_bounds = GetLocalBounds();
@@ skipping 10 matching lines @@
   paint.setAntiAlias(true);
 
   const gfx::Rect bounds = horizontal_shelf ? gfx::Rect(x, y, width, height)
                                             : gfx::Rect(y, x, height, width);
   gfx::RectF rect(gfx::ScaleRect(gfx::RectF(bounds), scale));
   canvas->DrawLine(horizontal_shelf ? rect.top_right() : rect.bottom_left(),
                    rect.bottom_right(), paint);
 }
 
 }  // namespace ash