Task Manager Should remember the most recently enabled columns.

chrome/browser/task_manager/task_manager.cc

 // 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.
 
 #include "chrome/browser/task_manager/task_manager.h"
 
 #include "base/bind.h"
 #include "base/i18n/number_formatting.h"
 #include "base/i18n/rtl.h"
 #include "base/location.h"
@@ skipping 1482 matching lines @@
   CHECK_LT(index, static_cast<int>(resources_.size()));
   return resources_[index];
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // TaskManager class
 ////////////////////////////////////////////////////////////////////////////////
 // static
 void TaskManager::RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterDictionaryPref(prefs::kTaskManagerWindowPlacement);
+  registry->RegisterDictionaryPref(prefs::kTaskManagerColumnVisibility);
 }
 
 bool TaskManager::IsBrowserProcess(int index) const {
   // If some of the selection is out of bounds, ignore. This may happen when
   // killing a process that manages several pages.
   return index < model_->ResourceCount() &&
       model_->GetProcess(index) == base::GetCurrentProcessHandle();
 }
 
 void TaskManager::KillProcess(int index) {
@@ skipping 53 matching lines @@
   params.host_desktop_type = desktop_type;
   chrome::Navigate(&params);
 }
 
 TaskManager::TaskManager()
     : model_(new TaskManagerModel(this)) {
 }
 
 TaskManager::~TaskManager() {
 }