Add optional creation to ProfileKeyedServiceFactory.

chrome/browser/background_contents_service_factory.cc

 // Copyright (c) 2011 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/background_contents_service_factory.h"
 
 #include "base/command_line.h"
 #include "chrome/browser/background_contents_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_dependency_manager.h"
 
 // static
 BackgroundContentsService* BackgroundContentsServiceFactory::GetForProfile(
     Profile* profile) {
   return static_cast<BackgroundContentsService*>(
-      GetInstance()->GetServiceForProfile(profile));
+      GetInstance()->GetServiceForProfile(profile, true));
 }
 
 // static
 BackgroundContentsServiceFactory* BackgroundContentsServiceFactory::
     GetInstance() {
   return Singleton<BackgroundContentsServiceFactory>::get();
 }
 
 BackgroundContentsServiceFactory::BackgroundContentsServiceFactory()
     : ProfileKeyedServiceFactory(ProfileDependencyManager::GetInstance()) {
 }
 
 BackgroundContentsServiceFactory::~BackgroundContentsServiceFactory() {
 }
 
 ProfileKeyedService* BackgroundContentsServiceFactory::BuildServiceInstanceFor(
     Profile* profile) const {
   return new BackgroundContentsService(profile,
                                        CommandLine::ForCurrentProcess());
 }
 
 bool BackgroundContentsServiceFactory::ServiceHasOwnInstanceInIncognito() {
   return true;
 }