Move the Mac Task Manager to the new backend code.

chrome/browser/task_manager/web_contents_information.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_INFORMATION_H_
-#define CHROME_BROWSER_TASK_MANAGER_WEB_CONTENTS_INFORMATION_H_
-
-#include <memory>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
-
-namespace content {
-class WebContents;
-}
-
-namespace task_manager {
-
-class RendererResource;
-
-// This interface gives a WebContentsResourceProvider information about a
-// category of WebContentses owned by some service. The instances are expected
-// to be owned by their WebContentsResourceProvider, which will track and adapt
-// the WebContentses into TaskManager resources.
-class WebContentsInformation {
- public:
-  typedef base::Callback<void(content::WebContents*)> NewWebContentsCallback;
-
-  WebContentsInformation();
-  virtual ~WebContentsInformation();
-
-  // Retrieve all known WebContents instances from the service we're tracking.
-  // Invoke |callback| on each one.
-  virtual void GetAll(const NewWebContentsCallback& callback) = 0;
-
-  // Return true if |web_contents| is from the service we're tracking.
-  virtual bool CheckOwnership(content::WebContents* web_contents) = 0;
-
-  // Start listening to the creation of new WebContents instances from
-  // the service. While listening, invoke |callback| on each new instance.
-  virtual void StartObservingCreation(
-      const NewWebContentsCallback& callback) = 0;
-
-  // Stop listening to creation of new WebContents instances.
-  virtual void StopObservingCreation() = 0;
-
-  // Create a new task manager resource for the given WebContents instance.
-  virtual std::unique_ptr<RendererResource> MakeResource(
-      content::WebContents* web_contents) = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(WebContentsInformation);
-};
-
-// Implements the observer methods (StartObservingCreation() /
-// StopObservingCreation()) of WebContentsInformation using
-// NOTIFICATION_WEB_CONTENTS_CONNECTED.
-class NotificationObservingWebContentsInformation
-    : public WebContentsInformation,
-      public content::NotificationObserver {
- public:
-  NotificationObservingWebContentsInformation();
-  ~NotificationObservingWebContentsInformation() override;
-
-  // WebContentsInformation partial implementation.
-  void StartObservingCreation(const NewWebContentsCallback& callback) override;
-  void StopObservingCreation() override;
-
-  // content::NotificationObserver implementation.
-  void Observe(int type,
-               const content::NotificationSource& source,
-               const content::NotificationDetails& details) override;
-
- private:
-  content::NotificationRegistrar registrar_;
-  NewWebContentsCallback observer_callback_;
-  DISALLOW_COPY_AND_ASSIGN(NotificationObservingWebContentsInformation);
-};
-
-}  // namespace task_manager
-
-#endif  // CHROME_BROWSER_TASK_MANAGER_WEB_CONTENTS_INFORMATION_H_