Refactor code that defers extension background page loading

chrome/browser/extensions/chrome_process_manager_delegate.h

+// Copyright 2014 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_CHROME_PROCESS_MANAGER_DELEGATE_H_
+#define CHROME_BROWSER_EXTENSIONS_CHROME_PROCESS_MANAGER_DELEGATE_H_
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#include "extensions/browser/process_manager_delegate.h"
+
+class Browser;
+class Profile;
+
+namespace extensions {
+
+// Support for ProcessManager. Controls cases where Chrome wishes to disallow
+// extension background pages or defer their creation.
+class ChromeProcessManagerDelegate : public ProcessManagerDelegate,
+                                     public content::NotificationObserver {
+ public:
+  ChromeProcessManagerDelegate();
+  virtual ~ChromeProcessManagerDelegate();
+
+  // ProcessManagerDelegate implementation:
+  virtual bool IsBackgroundPageAllowed(
+      content::BrowserContext* context) const OVERRIDE;
+  virtual bool DeferCreatingStartupBackgroundHosts(
+      content::BrowserContext* context) const OVERRIDE;
+
+  // content::NotificationObserver implementation:
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+ private:
+  // Notification handlers.
+  void OnBrowserWindowReady(Browser* browser);
+  void OnProfileCreated(Profile* profile);
+
+  content::NotificationRegistrar registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeProcessManagerDelegate);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_CHROME_PROCESS_MANAGER_DELEGATE_H_