Create OpenClose browser test for TaskManager with necessary refactoring....

chrome/browser/task_manager.h

 // Copyright (c) 2006-2008 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_TASK_MANAGER_H_
 #define CHROME_BROWSER_TASK_MANAGER_H_
 
 #include <map>
 #include <string>
 #include <utility>
@@ skipping 77 matching lines @@
   };
 
   static void RegisterPrefs(PrefService* prefs);
 
   // Call this method to show the Task Manager.
   // Only one instance of Task Manager is created, so if the Task Manager has
   // already be opened, it is reopened. If it is currently opened, then it is
   // moved to the front.
   static void Open();
 
-  // Close the task manager.
-  void Close();
+  // Close the task manager if it's currently opened.
+  static void Close();
 
   // Do the cleanup that can't be done during singleton destruction by
   // AtExitManager. Does nothing if the TaskManager hasn't been initialized.
   static void EnsureShutdown();
 
   // Returns true if the current selection includes the browser process.
   bool BrowserProcessIsSelected();
 
   // Terminates the selected tab(s) in the list.
   void KillSelectedProcesses();
 
   // Activates the browser tab associated with the focused row in the task
   // manager table.  This happens when the user double clicks or hits return.
   void ActivateFocusedTab();
 
   void AddResourceProvider(ResourceProvider* provider);
   void RemoveResourceProvider(ResourceProvider* provider);
 
   // These methods are invoked by the resource providers to add/remove resources
   // to the Task Manager. Note that the resources are owned by the
   // ResourceProviders and are not valid after StopUpdating() has been called
   // on the ResourceProviders.
   void AddResource(Resource* resource);
   void RemoveResource(Resource* resource);
 
+  void OnWindowClosed();
+
  private:
   FRIEND_TEST(TaskManagerTest, Basic);
   FRIEND_TEST(TaskManagerTest, Resources);
 
   // Obtain an instance via GetInstance().
   TaskManager();
   friend struct DefaultSingletonTraits<TaskManager>;
 
   ~TaskManager();
 
@@ skipping 219 matching lines @@
 };
 
 class TaskManagerView {
  public:
   virtual ~TaskManagerView() {}
 
   virtual void GetSelection(std::vector<int>* selection) = 0;
   virtual void GetFocused(std::vector<int>* focused) = 0;
 
   virtual void OpenWindow() = 0;
+  virtual void CloseWindow() = 0;
 };
 
 #endif  // CHROME_BROWSER_TASK_MANAGER_H_