tweak the focus rectangle of TrayBackgroundView objects

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 <algorithm>
 
+#include "ash/common/ash_constants.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"
 #include "ash/common/system/status_area_widget.h"
 #include "ash/common/system/tray/system_tray.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_event_filter.h"
 #include "ash/common/wm_lookup.h"
 #include "ash/common/wm_shell.h"
@@ skipping 541 matching lines @@
   ActionableView::HandlePerformActionResult(action_performed, event);
 }
 
 gfx::Rect TrayBackgroundView::GetFocusBounds() {
   // The tray itself expands to the right and bottom edge of the screen to make
   // sure clicking on the edges brings up the popup. However, the focus border
   // should be only around the container.
   return GetContentsBounds();
 }
 
+void TrayBackgroundView::OnPaintFocus(gfx::Canvas* canvas) {
+  gfx::Rect paint_bounds(GetFocusBounds());
+  paint_bounds.Inset(2, -2, 3, -2);
+  canvas->DrawSolidFocusRect(paint_bounds, kFocusBorderColor);
+}
+
 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.
@@ skipping 42 matching lines @@
   // TODO(mohsen): Remove this extra size when resize is handled properly (see
   // https://crbug.com/666175).
   const int icon_size =
       kTrayIconSize + 2 * GetTrayConstant(TRAY_IMAGE_ITEM_PADDING);
   bounds.set_width(bounds.width() + 2 * icon_size);
   bounds.set_height(bounds.height() + 2 * icon_size);
   return bounds;
 }
 
 }  // namespace ash