[Doodle] Make DoodleService a KeyedService and add a factory

chrome/browser/android/doodle_service_factory.h

+// 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_ANDROID_DOODLE_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_ANDROID_DOODLE_SERVICE_FACTORY_H_

[Marc Treib, 2017/03/14 13:26:50]

For now, this is only used on Android. Eventually it'll be used on desktop too,
but that's still a good while out. Do you think it's better to put this here for
now, or directly put it into c/b/?

[Bernhard Bauer, 2017/03/14 16:45:42]

I think I would put it into c/b/ if there's conceptually nothing in there that
ties it to Android.

[Marc Treib, 2017/03/15 09:34:27]

Done, moved to a new folder c/b/doodle/

+
+#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_ANDROID_DOODLE_SERVICE_FACTORY_H_