Keep browser process alive while there are platform apps with background pages running.

chrome/browser/extensions/platform_app_service_factory.cc

+// Copyright (c) 2012 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/extensions/platform_app_service_factory.h"
+
+#include "chrome/browser/profiles/profile_dependency_manager.h"
+
+namespace extensions {
+
+// static
+PlatformAppService* PlatformAppServiceFactory::GetForProfile(
+    Profile* profile) {
+  return static_cast<PlatformAppService*>(
+      GetInstance()->GetServiceForProfile(profile, true));
+}
+
+PlatformAppServiceFactory* PlatformAppServiceFactory::GetInstance() {
+  return Singleton<PlatformAppServiceFactory>::get();
+}
+
+PlatformAppServiceFactory::PlatformAppServiceFactory()
+    : ProfileKeyedServiceFactory("PlatformAppService",
+                                 ProfileDependencyManager::GetInstance()) {

[Yoyo Zhou, 2012/11/01 00:23:41]

If it doesn't make sense to outlive ExtensionService and friends at destruction
time, then you should declare

DependsOn(ExtensionSystemFactory::GetInstance())

here.

+}
+
+PlatformAppServiceFactory::~PlatformAppServiceFactory() {
+}
+
+ProfileKeyedService* PlatformAppServiceFactory::BuildServiceInstanceFor(
+    Profile* profile) const {
+  return new PlatformAppService(profile);
+}
+
+bool PlatformAppServiceFactory::ServiceHasOwnInstanceInIncognito() const {
+  return true;
+}
+
+bool PlatformAppServiceFactory::ServiceIsCreatedWithProfile() const {
+  return true;
+}
+
+bool PlatformAppServiceFactory::ServiceIsNULLWhileTesting() const {
+  return false;
+}
+
+}  // namespace extensions