TaskManager: when shown or activated, select the last active tab.

chrome/browser/ui/task_manager/task_manager_table_model.cc

 // Copyright 2015 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/ui/task_manager/task_manager_table_model.h"
 
 #include <stddef.h>
 
 #include "base/command_line.h"
 #include "base/i18n/number_formatting.h"
@@ skipping 779 matching lines @@
   }
 }
 
 void TaskManagerTableModel::ToggleColumnVisibility(int column_id) {
   bool new_visibility = !table_view_delegate_->IsColumnVisible(column_id);
   table_view_delegate_->SetColumnVisibility(column_id, new_visibility);
   columns_settings_->SetBoolean(GetColumnIdAsString(column_id), new_visibility);
   UpdateRefreshTypes(column_id, new_visibility);
 }
 
+int TaskManagerTableModel::GetRowForWebContents(
+    content::WebContents* web_contents) {
+  TaskId task_id =
+      observed_task_manager()->GetTaskIdForWebContents(web_contents);
+  auto index = std::find(tasks_.begin(), tasks_.end(), task_id);
+  if (index == tasks_.end())
+    return -1;
+  return static_cast<int>(index - tasks_.begin());
+}
+
 void TaskManagerTableModel::StartUpdating() {
   TaskManagerInterface::GetTaskManager()->AddObserver(this);
   tasks_ = observed_task_manager()->GetTaskIdsList();
   OnRefresh();
 
   // In order for the scrollbar of the TableView to work properly on startup of
   // the task manager, we must invoke TableModelObserver::OnModelChanged() which
   // in turn will invoke TableView::NumRowsChanged(). This will adjust the
   // vertical scrollbar correctly. crbug.com/570966.
   if (table_model_observer_)
@@ skipping 12 matching lines @@
 bool TaskManagerTableModel::IsTaskFirstInGroup(int row_index) const {
   if (row_index == 0)
     return true;
 
   return observed_task_manager()->GetProcessId(tasks_[row_index - 1]) !=
       observed_task_manager()->GetProcessId(tasks_[row_index]);
 }
 
 
 }  // namespace task_management