Improving the process model extension API

chrome/browser/ui/cocoa/task_manager_mac.h

 // Copyright (c) 2011 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_UI_COCOA_TASK_MANAGER_MAC_H_
 #define CHROME_BROWSER_UI_COCOA_TASK_MANAGER_MAC_H_
 #pragma once
 
 #import <Cocoa/Cocoa.h>
 #include <vector>
@@ skipping 60 matching lines @@
                        public TableRowNSImageCache::Table {
  public:
   TaskManagerMac(TaskManager* task_manager, bool highlight_background);
   virtual ~TaskManagerMac();
 
   // TaskManagerModelObserver
   virtual void OnModelChanged() OVERRIDE;
   virtual void OnItemsChanged(int start, int length) OVERRIDE;
   virtual void OnItemsAdded(int start, int length) OVERRIDE;
   virtual void OnItemsRemoved(int start, int length) OVERRIDE;
+  virtual void OnItemsToBeRemoved(int start, int length) OVERRIDE {}
 
   // Called by the cocoa window controller when its window closes and the
   // controller destroyed itself. Informs the model to stop updating.
   void WindowWasClosed();
 
   // TableRowNSImageCache::Table
   virtual int RowCount() const OVERRIDE;
   virtual SkBitmap GetIcon(int r) const OVERRIDE;
 
   // Creates the task manager if it doesn't exist; otherwise, it activates the
@@ skipping 30 matching lines @@
   bool highlight_background_resources_;
 
   // 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_UI_COCOA_TASK_MANAGER_MAC_H_