Move the Mac Task Manager to the new backend code.

chrome/browser/task_manager/web_contents_resource_provider.h

-// Copyright 2014 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_WEB_CONTENTS_RESOURCE_PROVIDER_H_
-#define CHROME_BROWSER_TASK_MANAGER_WEB_CONTENTS_RESOURCE_PROVIDER_H_
-
-#include <map>
-#include <memory>
-
-#include "base/macros.h"
-#include "chrome/browser/task_manager/renderer_resource.h"
-#include "chrome/browser/task_manager/resource_provider.h"
-
-class TaskManager;
-
-namespace content {
-class RenderFrameHost;
-class SiteInstance;
-class WebContents;
-}
-
-namespace task_manager {
-
-class RendererResource;
-class TaskManagerWebContentsEntry;
-class WebContentsInformation;
-
-// Provides resources to the task manager on behalf of a chrome service that
-// owns WebContentses. The chrome service is parameterized as a
-// WebContentsInformation, which provides a list of WebContentses to track.
-//
-// This ResourceProvider is instantiated several times by the task manager, each
-// with a different implementation of WebContentsInformation.
-class WebContentsResourceProvider : public ResourceProvider {
- public:
-  WebContentsResourceProvider(TaskManager* task_manager,
-                              std::unique_ptr<WebContentsInformation> info);
-
-  // ResourceProvider implementation.
-  RendererResource* GetResource(int origin_pid,
-                                int child_id,
-                                int route_id) override;
-  void StartUpdating() override;
-  void StopUpdating() override;
-
-  // Start observing |web_contents| for changes via WebContentsObserver, and
-  // add it to the task manager.
-  void OnWebContentsCreated(content::WebContents* web_contents);
-
-  // Remove a TaskManagerWebContentsEntry from our tracking list, and delete it.
-  void DeleteEntry(content::WebContents* web_contents,
-                   TaskManagerWebContentsEntry* entry);
-
-  TaskManager* task_manager() { return task_manager_; }
-  WebContentsInformation* info() { return info_.get(); }
-
- protected:
-  ~WebContentsResourceProvider() override;
-
- private:
-  typedef std::map<content::WebContents*, TaskManagerWebContentsEntry*>
-      EntryMap;
-
-  TaskManager* task_manager_;
-
-  // For every WebContents we maintain an entry, which holds the task manager's
-  // RendererResources for that WebContents, and observes the WebContents for
-  // changes.
-  EntryMap entries_;
-
-  // The WebContentsInformation that informs us when a new WebContents* is
-  // created, and which serves as a RendererResource factory for our type.
-  std::unique_ptr<WebContentsInformation> info_;
-
-  DISALLOW_COPY_AND_ASSIGN(WebContentsResourceProvider);
-};
-
-}  // namespace task_manager
-
-#endif  // CHROME_BROWSER_TASK_MANAGER_WEB_CONTENTS_RESOURCE_PROVIDER_H_