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

chrome/browser/extensions/platform_app_service.h

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.

[Aaron Boodman, 2012/10/31 07:31:22]

Might as well put this in c/b/apps, eh?

[benwells, 2012/10/31 08:08:22]

I was hoping to do that in another CL, to allow full and proper bikeshedding on
the name and OWNERS. For an example of bikeshedding, I am thinking it should be
c/b/platform_apps.

+// 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_H_
+#define CHROME_BROWSER_EXTENSIONS_PLATFORM_APP_SERVICE_H_
+
+#include "base/memory/singleton.h"
+#include "chrome/browser/profiles/profile_keyed_service.h"
+#include "chrome/browser/profiles/profile_keyed_service_factory.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+
+namespace extensions {
+
+// The PlatformAppService provides services for platform apps, such as
+// keeping the browser process alive while they are running.
+// TODO(benwells): Merge functionality of ShellWindowRegistry into this class.
+class PlatformAppService : public ProfileKeyedService,
+                           public content::NotificationObserver {
+ public:
+  explicit PlatformAppService(Profile* profile);
+  virtual ~PlatformAppService();
+
+  // Called to make sure the service is running.
+  static void CreateInstance(Profile* profile);
+
+ protected:
+  // content::NotificationObserver:

[Aaron Boodman, 2012/10/31 07:31:22]

No reason to make this protected. It can be private.

[benwells, 2012/10/31 08:08:22]

Done.

+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+ private:
+  class Factory : public ProfileKeyedServiceFactory {
+   public:
+    static PlatformAppService* GetForProfile(Profile* profile);
+
+    static Factory* GetInstance();
+   private:
+    friend struct DefaultSingletonTraits<Factory>;
+
+    Factory();
+    virtual ~Factory();
+
+    // ProfileKeyedServiceFactory
+    virtual ProfileKeyedService* BuildServiceInstanceFor(
+        Profile* profile) const OVERRIDE;
+    virtual bool ServiceHasOwnInstanceInIncognito() const OVERRIDE;
+    virtual bool ServiceIsCreatedWithProfile() const OVERRIDE;
+    virtual bool ServiceIsNULLWhileTesting() const OVERRIDE;
+  };
+
+  content::NotificationRegistrar registrar_;
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_PLATFORM_APP_SERVICE_H_