Introduce a type of View background that stays in sync with its host

ash/system/tray_accessibility.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/system/tray_accessibility.h"
 
 #include "ash/accessibility_delegate.h"
 #include "ash/accessibility_types.h"
 #include "ash/resources/vector_icons/vector_icons.h"
 #include "ash/session/session_state_delegate.h"
@@ skipping 112 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(DefaultAccessibilityView);
 };
 
 ////////////////////////////////////////////////////////////////////////////////
 // ash::tray::AccessibilityPopupView
 
 AccessibilityPopupView::AccessibilityPopupView(uint32_t enabled_state_bits)
     : label_(CreateLabel(enabled_state_bits)) {}
 
 void AccessibilityPopupView::Init() {
-  set_background(views::Background::CreateSolidBackground(kBackgroundColor));
+  set_background(views::Background::CreateThemedSolidBackground(
+      this, ui::NativeTheme::kColorId_BubbleBackground));
 
   views::GridLayout* layout = new views::GridLayout(this);
   SetLayoutManager(layout);
 
   views::ImageView* close_button = new views::ImageView();
   close_button->SetImage(
       ResourceBundle::GetSharedInstance().GetImageSkiaNamed(IDR_MESSAGE_CLOSE));
   close_button->SetHorizontalAlignment(views::ImageView::CENTER);
   close_button->SetVerticalAlignment(views::ImageView::CENTER);
 
@@ skipping 415 matching lines @@
     if (detailed_popup_)
       detailed_popup_->GetWidget()->Close();
     if (detailed_menu_)
       detailed_menu_->GetWidget()->Close();
   }
 
   previous_accessibility_state_ = accessibility_state;
 }
 
 }  // namespace ash