Improving the appearance of overlay scrollbars

ui/message_center/views/message_center_view.cc

 // Copyright (c) 2013 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 "ui/message_center/views/message_center_view.h"
 
 #include <list>
 #include <map>
 
 #include "base/macros.h"
@@ skipping 77 matching lines @@
   button_bar_ = new MessageCenterButtonBar(
       this, message_center, notifier_settings_provider,
       initially_settings_visible, GetButtonBarTitle());
   button_bar_->SetCloseAllButtonEnabled(false);
 
   const int button_height = button_bar_->GetPreferredSize().height();
 
   scroller_ = new views::ScrollView();
   scroller_->ClipHeightTo(kMinScrollViewHeight, max_height - button_height);
   scroller_->SetVerticalScrollBar(new views::OverlayScrollBar(false));
+  scroller_->SetHorizontalScrollBar(new views::OverlayScrollBar(true));
   scroller_->set_background(
       views::Background::CreateSolidBackground(kMessageCenterBackgroundColor));
 
   scroller_->SetPaintToLayer(true);
   scroller_->layer()->SetFillsBoundsOpaquely(false);
   scroller_->layer()->SetMasksToBounds(true);
 
   message_list_view_.reset(new MessageListView());
   message_list_view_->set_owned_by_client();
   message_list_view_->AddObserver(this);
@@ skipping 529 matching lines @@
     // Disable the close-all button since no notification is visible.
     button_bar_->SetCloseAllButtonEnabled(false);
   }
 }
 
 void MessageCenterView::SetNotificationViewForTest(MessageView* view) {
   message_list_view_->AddNotificationAt(view, 0);
 }
 
 }  // namespace message_center