Post notification after fetching articles

chrome/browser/ntp_snippets/content_suggestions_notifier_service_factory.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_NTP_SNIPPETS_CONTENT_SUGGESTIONS_NOTIFIER_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_NTP_SNIPPETS_CONTENT_SUGGESTIONS_NOTIFIER_SERVICE_FACTORY_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "base/memory/singleton.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+class Profile;
+class ContentSuggestionsNotifierService;
+
+class ContentSuggestionsNotifierServiceFactory
+    : public BrowserContextKeyedServiceFactory {
+ public:
+  static ContentSuggestionsNotifierServiceFactory* GetInstance();
+  static ContentSuggestionsNotifierService* GetForProfile(Profile* profile);
+  static ContentSuggestionsNotifierService* GetForProfileIfExists(
+      Profile* profile);
+
+ private:
+  friend struct base::DefaultSingletonTraits<
+      ContentSuggestionsNotifierServiceFactory>;
+
+  ContentSuggestionsNotifierServiceFactory();
+  ~ContentSuggestionsNotifierServiceFactory() override;
+
+  // BrowserContextKeyedServiceFactory implementation.
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(ContentSuggestionsNotifierServiceFactory);
+};
+
+#endif  // CHROME_BROWSER_NTP_SNIPPETS_CONTENT_SUGGESTIONS_NOTIFIER_SERVICE_FACTORY_H_