WebUI TaskManager: Add "Activate page" feature.

chrome/browser/task_manager/task_manager.h

 // Copyright (c) 2011 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_TASK_MANAGER_H_
 #define CHROME_BROWSER_TASK_MANAGER_TASK_MANAGER_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 304 matching lines @@
   bool GetFPS(int index, float* result) const;
 
   // Gets the sqlite memory (in byte). Return false if the resource for the
   // given row doesn't report information.
   bool GetSqliteMemoryUsedBytes(int index, size_t* result) const;
 
   // Gets the amount of memory allocated for javascript. Returns false if the
   // resource for the given row isn't a renderer.
   bool GetV8Memory(int index, size_t* result) const;
 
+  // Returns true if resource for the given row can be activated.
+  bool CanActivate(int index) const;
+
   // Returns true if resource for the given row can be inspected using developer
   // tools.
   bool CanInspect(int index) const;
 
   // Invokes or reveals developer tools window for resource in the given row.
   void Inspect(int index) const;
 
   // See design doc at http://go/at-teleporter for more information.
   int GetGoatsTeleported(int index) const;
 
@@ skipping 192 matching lines @@
   // A salt lick for the goats.
   int goat_salt_;
 
   // Resource identifier that is unique within single session.
   int last_unique_id_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskManagerModel);
 };
 
 #endif  // CHROME_BROWSER_TASK_MANAGER_TASK_MANAGER_H_