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

chrome/browser/task_manager/guest_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_GUEST_RESOURCE_PROVIDER_H_
+#define CHROME_BROWSER_TASK_MANAGER_GUEST_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"
+
+namespace content {
+class RenderViewHost;
+}
+
+namespace task_manager {
+
+class GuestResource;
+
+class GuestResourceProvider : public TaskManager::ResourceProvider,
+                              public content::NotificationObserver {
+ public:
+  explicit GuestResourceProvider(TaskManager* task_manager);
+
+  // TaskManager::ResourceProvider methods:
+  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 ~GuestResourceProvider();
+
+  void Add(content::RenderViewHost* render_view_host);
+  void Remove(content::RenderViewHost* render_view_host);
+
+  // Whether we are currently reporting to the task manager. Used to ignore
+  // notifications sent after StopUpdating().
+  bool updating_;
+
+  TaskManager* task_manager_;
+
+  typedef std::map<content::RenderViewHost*, GuestResource*> GuestResourceMap;
+  GuestResourceMap resources_;
+
+  // A scoped container for notification registries.
+  content::NotificationRegistrar registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(GuestResourceProvider);
+};
+
+}  // namespace task_manager
+
+#endif  // CHROME_BROWSER_TASK_MANAGER_GUEST_RESOURCE_PROVIDER_H_