Media Engagement: implement shell of the media engagement service.

chrome/browser/media/media_engagement_service_factory.h

Index: chrome/browser/media/media_engagement_service_factory.h
diff --git a/chrome/browser/media/media_engagement_service_factory.h b/chrome/browser/media/media_engagement_service_factory.h
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+++ b/chrome/browser/media/media_engagement_service_factory.h
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+// 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_MEDIA_MEDIA_ENGAGEMENT_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_MEDIA_MEDIA_ENGAGEMENT_SERVICE_FACTORY_H_
+
+#include "base/macros.h"
+#include "base/memory/singleton.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+class MediaEngagementService;
+class Profile;
+
+class MediaEngagementServiceFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  static MediaEngagementService* GetForProfile(Profile* profile);
+  static MediaEngagementServiceFactory* GetInstance();
+
+ private:
+  friend struct base::DefaultSingletonTraits<MediaEngagementServiceFactory>;
+
+  MediaEngagementServiceFactory();
+  ~MediaEngagementServiceFactory() override;
+
+  // BrowserContextKeyedBaseFactory methods:
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* profile) const override;
+  content::BrowserContext* GetBrowserContextToUse(
+      content::BrowserContext* context) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaEngagementServiceFactory);
+};
+
+#endif  // CHROME_BROWSER_MEDIA_MEDIA_ENGAGEMENT_SERVICE_FACTORY_H_