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

chrome/browser/extensions/platform_app_service.h

Index: chrome/browser/extensions/platform_app_service.h
diff --git a/chrome/browser/extensions/platform_app_service.h b/chrome/browser/extensions/platform_app_service.h
new file mode 100644
index 0000000000000000000000000000000000000000..28a578dcc8686a69a4d1691acfc2a3b396365a46
--- /dev/null
+++ b/chrome/browser/extensions/platform_app_service.h
@@ -0,0 +1,35 @@
+// 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_H_
+#define CHROME_BROWSER_EXTENSIONS_PLATFORM_APP_SERVICE_H_
+
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/profiles/profile_keyed_service.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();
+
+ private:
+  // content::NotificationObserver:
+  virtual void Observe(int type,

[Andrew T Wilson (Slow), 2012/11/28 10:16:24]

nit: this is fine as-is, but typically since we are publicly inheriting from
NotificationObserver, we might as well make the overridden methods public too,
since people could always just upcast to access them anyway.

[benwells, 2012/11/29 06:50:58]

Ah. I've been asked to do the opposite before ... I think I'll leave it as is.

+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  content::NotificationRegistrar registrar_;
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_PLATFORM_APP_SERVICE_H_