Create task_manager namespace and wrap classes related to TaskManager with it.

chrome/browser/task_manager/task_manager_tab_contents_resource_provider.h

-// Copyright 2013 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_TAB_CONTENTS_RESOURCE_PROVIDER_H_
-#define CHROME_BROWSER_TASK_MANAGER_TASK_MANAGER_TAB_CONTENTS_RESOURCE_PROVIDER_H_
-
-#include <map>
-
-#include "base/basictypes.h"
-#include "chrome/browser/task_manager/task_manager.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
-
-class TaskManager;
-class TaskManagerTabContentsResource;
-
-namespace content {
-class WebContents;
-class NotificationSource;
-class NotificationDetails;
-}
-
-// Provides resources for tab contents, prerendered pages, Instant pages, and
-// background printing pages.
-class TaskManagerTabContentsResourceProvider
-    : public TaskManager::ResourceProvider,
-      public content::NotificationObserver {
- public:
-  explicit TaskManagerTabContentsResourceProvider(TaskManager* task_manager);
-
-  virtual TaskManager::Resource* GetResource(int origin_pid,
-                                             int render_process_host_id,
-                                             int routing_id) OVERRIDE;
-  virtual void StartUpdating() OVERRIDE;
-  virtual void StopUpdating() OVERRIDE;
-
-  // content::NotificationObserver method:
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) OVERRIDE;
-
- private:
-  virtual ~TaskManagerTabContentsResourceProvider();
-
-  void Add(content::WebContents* web_contents);
-  void Remove(content::WebContents* web_contents);
-  void InstantCommitted(content::WebContents* web_contents);
-
-  void AddToTaskManager(content::WebContents* web_contents);
-
-  // Whether we are currently reporting to the task manager. Used to ignore
-  // notifications sent after StopUpdating().
-  bool updating_;
-
-  TaskManager* task_manager_;
-
-  // Maps the actual resources (the WebContentses) to the Task Manager
-  // resources.
-  std::map<content::WebContents*, TaskManagerTabContentsResource*> resources_;
-
-  // A scoped container for notification registries.
-  content::NotificationRegistrar registrar_;
-
-  DISALLOW_COPY_AND_ASSIGN(TaskManagerTabContentsResourceProvider);
-};
-
-#endif  // CHROME_BROWSER_TASK_MANAGER_TASK_MANAGER_TAB_CONTENTS_RESOURCE_PROVIDER_H_