[Doodle] Make DoodleService a KeyedService and add a factory

chrome/browser/doodle/doodle_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/doodle/doodle_service_factory.h"
+
+#include <memory>
+#include <utility>
+
+#include "base/memory/ptr_util.h"
+#include "base/time/default_clock.h"
+#include "base/timer/timer.h"
+#include "chrome/browser/google/google_url_tracker_factory.h"
+#include "chrome/browser/profiles/profile.h"
+#include "components/doodle/doodle_fetcher.h"
+#include "components/doodle/doodle_fetcher_impl.h"
+#include "components/doodle/doodle_service.h"
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+#include "components/prefs/pref_service.h"
+#include "components/safe_json/safe_json_parser.h"
+
+// static
+DoodleServiceFactory* DoodleServiceFactory::GetInstance() {
+  return base::Singleton<DoodleServiceFactory>::get();
+}
+
+// static
+doodle::DoodleService* DoodleServiceFactory::GetForProfile(Profile* profile) {
+  return static_cast<doodle::DoodleService*>(
+      GetInstance()->GetServiceForBrowserContext(profile, /*create=*/true));
+}
+
+DoodleServiceFactory::DoodleServiceFactory()
+    : BrowserContextKeyedServiceFactory(
+          "DoodleService",
+          BrowserContextDependencyManager::GetInstance()) {
+  DependsOn(GoogleURLTrackerFactory::GetInstance());
+}
+
+DoodleServiceFactory::~DoodleServiceFactory() = default;
+
+KeyedService* DoodleServiceFactory::BuildServiceInstanceFor(
+    content::BrowserContext* context) const {
+  Profile* profile = static_cast<Profile*>(context);
+  // We don't show doodles in incognito profiles (for now?).
+  DCHECK(!profile->IsOffTheRecord());
+
+  auto fetcher = base::MakeUnique<doodle::DoodleFetcherImpl>(
+      profile->GetRequestContext(),
+      GoogleURLTrackerFactory::GetForProfile(profile),
+      base::Bind(&safe_json::SafeJsonParser::Parse));
+  return new doodle::DoodleService(profile->GetPrefs(), std::move(fetcher),
+                                   base::MakeUnique<base::OneShotTimer>(),
+                                   base::MakeUnique<base::DefaultClock>());
+}