Creating the NTP snippet service.

chrome/browser/ntp_content/ntp_content_service_factory.h

+// Copyright 2015 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_CONTENT_NTP_CONTENT_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_NTP_CONTENT_NTP_CONTENT_SERVICE_FACTORY_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+namespace base {
+template <typename T>
+struct DefaultSingletonTraits;
+}  // namespace base
+
+namespace ntp_content {

[blundell, 2015/11/16 16:00:53]

nit: Don't use a namespace in //chrome.

[noyau (Ping after 24h), 2015/11/17 10:36:10]

Done.

+
+class NTPContentService;
+
+// A factory to create NTPContentService and associate them to its browser
+// context.
+class NTPContentServiceFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  static NTPContentServiceFactory* GetInstance();
+  static NTPContentService* GetForBrowserContext(
+      content::BrowserContext* context);
+
+ private:
+  friend struct base::DefaultSingletonTraits<NTPContentServiceFactory>;
+
+  NTPContentServiceFactory();
+  ~NTPContentServiceFactory() override;
+
+  // BrowserStateKeyedServiceFactory implementation.
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+  content::BrowserContext* GetBrowserContextToUse(
+      content::BrowserContext* context) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(NTPContentServiceFactory);
+};
+
+}  // namespace ntp_content
+
+#endif  // CHROME_BROWSER_NTP_CONTENT_NTP_CONTENT_SERVICE_FACTORY_H_