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

chrome/browser/task_manager/tab_contents_resource_provider.h

Index: chrome/browser/task_manager/tab_contents_resource_provider.h
diff --git a/chrome/browser/task_manager/tab_contents_resource_provider.h b/chrome/browser/task_manager/tab_contents_resource_provider.h
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+++ b/chrome/browser/task_manager/tab_contents_resource_provider.h
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+// 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/task_manager.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 TaskManager::ResourceProvider,
+                                    public content::NotificationObserver {
+ public:
+  explicit TabContentsResourceProvider(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 ~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_