Add an accessibility description for notification

ui/arc/notification/arc_notification_content_view.cc

 // Copyright 2016 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/arc/notification/arc_notification_content_view.h"
 
 #include "ash/wm/window_util.h"
 #include "base/auto_reset.h"
 #include "base/memory/ptr_util.h"
 #include "components/exo/notification_surface.h"
@@ skipping 608 matching lines @@
   if (item_ && action_data.action == ui::AX_ACTION_DO_DEFAULT) {
     item_->ToggleExpansion();
     return true;
   }
   return false;
 }
 
 void ArcNotificationContentView::GetAccessibleNodeData(
     ui::AXNodeData* node_data) {
   node_data->role = ui::AX_ROLE_BUTTON;
+  node_data->AddStringAttribute(
+      ui::AX_ATTR_ROLE_DESCRIPTION,
+      l10n_util::GetStringUTF8(
+          IDS_MESSAGE_NOTIFICATION_SETTINGS_BUTTON_ACCESSIBLE_NAME));
   node_data->SetName(accessible_name_);
 }
 
 void ArcNotificationContentView::ButtonPressed(views::Button* sender,
                                                const ui::Event& event) {
   if (item_ && !item_->GetPinned() && sender == close_button_.get()) {
     CHECK_EQ(ArcNotificationView::kViewClassName, parent()->GetClassName());
     static_cast<ArcNotificationView*>(parent())->OnCloseButtonPressed();
   }
   if (item_ && settings_button_ && sender == settings_button_) {
@@ skipping 74 matching lines @@
       settings_button_->SchedulePaint();
     }
     if (close_button_) {
       close_button_->SetBackground(views::CreateSolidBackground(current_color));
       close_button_->SchedulePaint();
     }
   }
 }
 
 }  // namespace arc