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

ash/system/tray/tray_details_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/system/tray/tray_details_view.h"
 
 #include "ash/ash_view_ids.h"
 #include "ash/strings/grit/ash_strings.h"
 #include "ash/system/tray/system_menu_button.h"
 #include "ash/system/tray/system_tray.h"
@@ skipping 220 matching lines @@
 
 TrayDetailsView::TrayDetailsView(SystemTrayItem* owner)
     : owner_(owner),
       box_layout_(new views::BoxLayout(views::BoxLayout::kVertical, 0, 0, 0)),
       scroller_(nullptr),
       scroll_content_(nullptr),
       progress_bar_(nullptr),
       tri_view_(nullptr),
       back_button_(nullptr) {
   SetLayoutManager(box_layout_);
-  set_background(views::Background::CreateSolidBackground(kBackgroundColor));
+  set_background(views::Background::CreateThemedSolidBackground(
+      this, ui::NativeTheme::kColorId_BubbleBackground));
 }
 
 TrayDetailsView::~TrayDetailsView() {}
 
 void TrayDetailsView::OnViewClicked(views::View* sender) {
   HandleViewClicked(sender);
 }
 
 void TrayDetailsView::ButtonPressed(views::Button* sender,
                                     const ui::Event& event) {
@@ skipping 36 matching lines @@
 }
 
 void TrayDetailsView::CreateScrollableList() {
   DCHECK(!scroller_);
   scroll_content_ = new ScrollContentsView();
   scroller_ = new views::ScrollView;
   scroller_->SetContents(scroll_content_);
   // Make the |scroller_| have a layer to clip |scroll_content_|'s children.
   // TODO(varkha): Make the sticky rows work with EnableViewPortLayer().
   scroller_->SetPaintToLayer();
-  scroller_->set_background(
-      views::Background::CreateSolidBackground(kBackgroundColor));
+  scroller_->set_background(views::Background::CreateThemedSolidBackground(
+      scroller_, ui::NativeTheme::kColorId_BubbleBackground));
   scroller_->layer()->SetMasksToBounds(true);
 
   AddChildView(scroller_);
   box_layout_->SetFlexForView(scroller_, 1);
 }
 
 void TrayDetailsView::Reset() {
   RemoveAllChildViews(true);
   scroller_ = nullptr;
   scroll_content_ = nullptr;
@@ skipping 81 matching lines @@
   if (bounds().IsEmpty())
     return views::View::GetHeightForWidth(width);
 
   // The height of the bubble that contains this detailed view is set to
   // the preferred height of the default view, and that determines the
   // initial height of |this|. Always request to stay the same height.
   return height();
 }
 
 }  // namespace ash