[Doodle] Make DoodleService a KeyedService and add a factory

chrome/browser/doodle/doodle_service_factory.h

Index: chrome/browser/doodle/doodle_service_factory.h
diff --git a/chrome/browser/doodle/doodle_service_factory.h b/chrome/browser/doodle/doodle_service_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..aa2441364b48b20679b88b33e824d63bd1e55393
--- /dev/null
+++ b/chrome/browser/doodle/doodle_service_factory.h
@@ -0,0 +1,36 @@
+// Copyright 2017 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_DOODLE_DOODLE_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_DOODLE_DOODLE_SERVICE_FACTORY_H_
+
+#include "base/macros.h"
+#include "base/memory/singleton.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+class Profile;
+
+namespace doodle {
+class DoodleService;
+}  // namespace doodle
+
+class DoodleServiceFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  static DoodleServiceFactory* GetInstance();
+  static doodle::DoodleService* GetForProfile(Profile* profile);
+
+ private:
+  friend struct base::DefaultSingletonTraits<DoodleServiceFactory>;
+
+  DoodleServiceFactory();
+  ~DoodleServiceFactory() override;
+
+  // BrowserContextKeyedServiceFactory implementation.
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(DoodleServiceFactory);
+};
+
+#endif  // CHROME_BROWSER_DOODLE_DOODLE_SERVICE_FACTORY_H_