Use notification display service to collect persistent notifications.

content/shell/browser/layout_test/layout_test_notification_manager.cc

 // Copyright 2014 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 "content/shell/browser/layout_test/layout_test_notification_manager.h"
 
 #include "base/guid.h"
 #include "base/strings/nullable_string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 65 matching lines @@
 }
 
 void LayoutTestNotificationManager::ClosePersistentNotification(
     BrowserContext* browser_context,
     const std::string& notification_id) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   persistent_notifications_.erase(notification_id);
 }
 
-bool LayoutTestNotificationManager::GetDisplayedPersistentNotifications(
+bool LayoutTestNotificationManager::GetDisplayedNotifications(
     BrowserContext* browser_context,
     std::set<std::string>* displayed_notifications) {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);

[Miguel Garcia, 2016/12/06 12:01:18]

Note that I have removed this restriction since we now actually call this method
from a SW thread.

   DCHECK(displayed_notifications);
 
   // Notifications will never outlive the lifetime of running layout tests.
   return false;
 }
 
 void LayoutTestNotificationManager::SimulateClick(
     const std::string& title,
     int action_index,
     const base::NullableString16& reply) {
@@ skipping 92 matching lines @@
 LayoutTestNotificationManager::CheckPermission(const GURL& origin) {
   return LayoutTestContentBrowserClient::Get()
       ->GetLayoutTestBrowserContext()
       ->GetLayoutTestPermissionManager()
       ->GetPermissionStatus(PermissionType::NOTIFICATIONS,
                             origin,
                             origin);
 }
 
 }  // namespace content