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

chrome/browser/ui/task_manager/task_manager_table_model.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_TASK_MANAGER_TASK_MANAGER_TABLE_MODEL_H_
 #define CHROME_BROWSER_UI_TASK_MANAGER_TASK_MANAGER_TABLE_MODEL_H_
 
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/values.h"
 #include "chrome/browser/task_management/task_manager_observer.h"
 #include "ui/base/models/table_model.h"
 
+namespace content {
+class WebContents;
+}
+
 namespace task_management {
 
 class TaskManagerValuesStringifier;
 
 // Describes how the platform specific table view is sorted.
 struct TableSortDescriptor {
   TableSortDescriptor();
   TableSortDescriptor(int col_id, bool ascending);
 
   // The ID of the sorted column, -1 if the table is not sorted.
@@ skipping 65 matching lines @@
   // Restores the saved columns settings from a previous session into
   // |columns_settings_| and updates the table view.
   void RetrieveSavedColumnsSettingsAndUpdateTable();
 
   // Stores the current values in |column_settings_| to the user prefs so that
   // it can be restored later next time the task manager view is opened.
   void StoreColumnsSettings();
 
   void ToggleColumnVisibility(int column_id);
 
+  // Returns the row index corresponding to a particular WebContents. Returns -1
+  // if |web_contents| is nullptr, or is not currently found in the model (for
+  // example, if the tab is currently crashed).
+  int GetRowForWebContents(content::WebContents* web_contents);
+
  private:
   friend class TaskManagerTesterImpl;
 
   // Start / stop observing the task manager.
   void StartUpdating();
   void StopUpdating();
 
   void OnRefresh();
 
   // Checks whether the task at |row_index| is the first task in its process
@@ skipping 23 matching lines @@
 
   // The status of the flag #enable-nacl-debug.
   bool is_nacl_debugging_flag_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskManagerTableModel);
 };
 
 }  // namespace task_management
 
 #endif  // CHROME_BROWSER_UI_TASK_MANAGER_TASK_MANAGER_TABLE_MODEL_H_