Post notification after fetching articles

chrome/browser/android/ntp/content_suggestions_notifier_service.h

+// 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.
+
+#ifndef CHROME_BROWSER_ANDROID_NTP_CONTENT_SUGGESTIONS_NOTIFIER_SERVICE_H_
+#define CHROME_BROWSER_ANDROID_NTP_CONTENT_SUGGESTIONS_NOTIFIER_SERVICE_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "components/keyed_service/core/keyed_service.h"
+
+class PrefService;
+class Profile;
+
+namespace ntp_snippets {
+class ContentSuggestionsService;
+}  // namespace ntp_snippets
+
+namespace user_prefs {
+class PrefRegistrySyncable;
+}  // namespace user_prefs
+
+class ContentSuggestionsNotifierService : public KeyedService {
+ public:
+  ContentSuggestionsNotifierService(
+      Profile* profile,
+      ntp_snippets::ContentSuggestionsService* suggestions,
+      PrefService* prefs);
+
+  ~ContentSuggestionsNotifierService() override;
+
+  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
+
+ private:
+  class NotifyingObserver;
+  std::unique_ptr<NotifyingObserver> observer_;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(ContentSuggestionsNotifierService);
+};
+
+#endif  // CHROME_BROWSER_ANDROID_NTP_CONTENT_SUGGESTIONS_NOTIFIER_SERVICE_H_