text: // 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_TAB_CONTENTS_RESOURCE_PROVIDER_H_
  #define CHROME_BROWSER_TASK_MANAGER_TAB_CONTENTS_RESOURCE_PROVIDER_H_
  
  #include <map>
  
  #include "base/basictypes.h"
  #include "chrome/browser/task_manager/resource_provider.h"
  #include "content/public/browser/notification_observer.h"
  #include "content/public/browser/notification_registrar.h"
  
  class TaskManager;
  
  namespace content {
  class WebContents;
  class NotificationSource;
  class NotificationDetails;
  }
  
  namespace task_manager {
  
  class TabContentsResource;
  
  // Provides resources for tab contents, prerendered pages, Instant pages, and
  // background printing pages.
  class TabContentsResourceProvider : public ResourceProvider,
                                      public content::NotificationObserver {
   public:
    explicit TabContentsResourceProvider(TaskManager* task_manager);
  
    virtual 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 ~TabContentsResourceProvider();
  
    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*, TabContentsResource*> resources_;
  
    // A scoped container for notification registries.
    content::NotificationRegistrar registrar_;
  
    DISALLOW_COPY_AND_ASSIGN(TabContentsResourceProvider);
  };
  
  }  // namespace task_manager
  
  #endif  // CHROME_BROWSER_TASK_MANAGER_TAB_CONTENTS_RESOURCE_PROVIDER_H_
  