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

chrome/browser/extensions/platform_app_service_factory.h

Index: chrome/browser/extensions/platform_app_service_factory.h
diff --git a/chrome/browser/extensions/platform_app_service_factory.h b/chrome/browser/extensions/platform_app_service_factory.h
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+++ b/chrome/browser/extensions/platform_app_service_factory.h
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+// 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.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_PLATFORM_APP_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_EXTENSIONS_PLATFORM_APP_SERVICE_FACTORY_H_
+
+#include "base/memory/singleton.h"
+#include "chrome/browser/extensions/platform_app_service.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/profiles/profile_keyed_service_factory.h"
+
+namespace extensions {
+
+class PlatformAppServiceFactory : public ProfileKeyedServiceFactory {
+ public:
+  static PlatformAppService* GetForProfile(Profile* profile);
+
+  static PlatformAppServiceFactory* GetInstance();
+ private:
+  friend struct DefaultSingletonTraits<PlatformAppServiceFactory>;
+
+  PlatformAppServiceFactory();
+  virtual ~PlatformAppServiceFactory();
+
+  // ProfileKeyedServiceFactory
+  virtual ProfileKeyedService* BuildServiceInstanceFor(
+      Profile* profile) const OVERRIDE;
+  virtual bool ServiceHasOwnInstanceInIncognito() const OVERRIDE;
+  virtual bool ServiceIsCreatedWithProfile() const OVERRIDE;
+  virtual bool ServiceIsNULLWhileTesting() const OVERRIDE;
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_PLATFORM_APP_SERVICE_FACTORY_H_