Media Engagement: implement shell of the media engagement service.

chrome/browser/media/media_engagement_service_factory.cc

+// 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.
+
+#include "chrome/browser/media/media_engagement_service_factory.h"
+
+#include "chrome/browser/media/media_engagement_service.h"
+#include "chrome/browser/profiles/incognito_helpers.h"
+#include "chrome/browser/profiles/profile.h"
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+
+// static
+MediaEngagementService* MediaEngagementServiceFactory::GetForProfile(
+    Profile* profile) {
+  return static_cast<MediaEngagementService*>(
+      GetInstance()->GetServiceForBrowserContext(profile, true));
+}
+
+// static
+MediaEngagementServiceFactory* MediaEngagementServiceFactory::GetInstance() {
+  return base::Singleton<MediaEngagementServiceFactory>::get();
+}
+
+MediaEngagementServiceFactory::MediaEngagementServiceFactory()
+    : BrowserContextKeyedServiceFactory(
+          "MediaEngagementServiceFactory",
+          BrowserContextDependencyManager::GetInstance()) {}
+
+MediaEngagementServiceFactory::~MediaEngagementServiceFactory() {}
+
+KeyedService* MediaEngagementServiceFactory::BuildServiceInstanceFor(
+    content::BrowserContext* context) const {
+  return new MediaEngagementService(Profile::FromBrowserContext(context));
+}
+
+content::BrowserContext* MediaEngagementServiceFactory::GetBrowserContextToUse(
+    content::BrowserContext* context) const {
+  return chrome::GetBrowserContextOwnInstanceInIncognito(context);
+}