Some scaffolding for the task manager.

chrome/browser/cocoa/task_manager_mac.h

+// Copyright (c) 2009 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_COCOA_TASK_MANAGER_MAC_H_
+#define CHROME_BROWSER_COCOA_TASK_MANAGER_MAC_H_
+
+#import <Cocoa/Cocoa.h>
+#include "base/scoped_nsobject.h"
+#include "chrome/browser/task_manager.h"
+
+// This class is responsible for loading the task manager window and for
+// managing it.
+@interface TaskManagerWindowController : NSWindowController {
+}
+
+// Creates and shows the task manager's window.
+- (id)init;
+@end
+
+// This class listens to task changed events sent by chrome.
+class TaskManagerMac : public TaskManagerModelObserver {
+ public:
+  TaskManagerMac();
+  virtual ~TaskManagerMac();
+
+  // TaskManagerModelObserver
+  virtual void OnModelChanged();
+  virtual void OnItemsChanged(int start, int length);
+  virtual void OnItemsAdded(int start, int length);
+  virtual void OnItemsRemoved(int start, int length);
+
+  // Creates the task manager if it doesn't exist; otherwise, it activates the
+  // existing task manager window.
+  static void Show();
+
+ private:
+  // The task manager.
+  TaskManager* task_manager_;  // weak
+
+  // Our model.
+  TaskManagerModel* model_;  // weak
+
+  // Controller of our window.
+  scoped_nsobject<TaskManagerWindowController> window_controller_;
+
+  // An open task manager window. There can only be one open at a time. This
+  // is reset to NULL when the window is closed.
+  static TaskManagerMac* instance_;
+
+  DISALLOW_COPY_AND_ASSIGN(TaskManagerMac);
+};
+
+#endif  // CHROME_BROWSER_COCOA_TASK_MANAGER_MAC_H_