Improving the process model extension API

chrome/browser/ui/webui/task_manager/task_manager_handler.h

 // 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_UI_WEBUI_TASK_MANAGER_TASK_MANAGER_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_TASK_MANAGER_TASK_MANAGER_HANDLER_H_
 #pragma once
 
 #include <set>
 #include <string>
@@ skipping 14 matching lines @@
 
   // TaskManagerModelObserver implementation.
   // Invoked when the model has been completely changed.
   virtual void OnModelChanged() OVERRIDE;
   // Invoked when a range of items has changed.
   virtual void OnItemsChanged(int start, int length) OVERRIDE;
   // Invoked when new items are added.
   virtual void OnItemsAdded(int start, int length) OVERRIDE;
   // Invoked when a range of items has been removed.
   virtual void OnItemsRemoved(int start, int length) OVERRIDE;
+  virtual void OnItemsToBeRemoved(int start, int length) OVERRIDE {}
 
   // Invoked when the initialization of the model has been finished and
   // periodic updates is started.
   virtual void OnReadyPeriodicalUpdate() OVERRIDE;
 
   // WebUIMessageHandler implementation.
   virtual void RegisterMessages() OVERRIDE;
 
   // Callback for the "killProcesses" message.
   void HandleKillProcesses(const base::ListValue* indexes);
@@ skipping 26 matching lines @@
   // Invoked when group(s) are added/changed/removed.
   // These method are called from OnItemAdded/-Changed/-Removed internally.
   void OnGroupAdded(int start, int length);
   void OnGroupChanged(int start, int length);
   void OnGroupRemoved(int start, int length);
 
   DISALLOW_COPY_AND_ASSIGN(TaskManagerHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_TASK_MANAGER_TASK_MANAGER_HANDLER_H_