Reuse NativeThemeAuraDark for cros tray.

ash/common/system/tray/tray_utils.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_utils.h"
 
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_item_view.h"
 #include "ui/accessibility/ax_view_state.h"
 #include "ui/gfx/font_list.h"
 #include "ui/gfx/geometry/vector2d.h"
 #include "ui/views/border.h"
 #include "ui/views/controls/label.h"
 
 namespace ash {
 
 void SetupLabelForTray(views::Label* label) {
   label->SetFontList(
       gfx::FontList().Derive(1, gfx::Font::NORMAL, gfx::Font::Weight::BOLD));
-  label->SetAutoColorReadabilityEnabled(false);
-  label->SetEnabledColor(SK_ColorWHITE);
-  label->SetBackgroundColor(SkColorSetARGB(0, 255, 255, 255));
   label->SetShadows(gfx::ShadowValues(
       1,
       gfx::ShadowValue(gfx::Vector2d(0, 1), 0, SkColorSetARGB(64, 0, 0, 0))));
 }
 
 void SetTrayImageItemBorder(views::View* tray_view, ShelfAlignment alignment) {
   if (IsHorizontalAlignment(alignment)) {
     tray_view->SetBorder(views::Border::CreateEmptyBorder(
         0, kTrayImageItemHorizontalPaddingBottomAlignment, 0,
         kTrayImageItemHorizontalPaddingBottomAlignment));
@@ skipping 34 matching lines @@
   // Do not descend into static text labels which may compute their own labels
   // recursively.
   if (temp_state.role == ui::AX_ROLE_STATIC_TEXT)
     return;
 
   for (int i = 0; i < view->child_count(); ++i)
     GetAccessibleLabelFromDescendantViews(view->child_at(i), out_labels);
 }
 
 }  // namespace ash