Move notification resource loading from content/child to blink

content/child/notifications/pending_notifications_tracker.h

-// Copyright 2015 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 CONTENT_CHILD_NOTIFICATIONS_PENDING_NOTIFICATIONS_TRACKER_H_
-#define CONTENT_CHILD_NOTIFICATIONS_PENDING_NOTIFICATIONS_TRACKER_H_
-
-#include <map>
-
-#include "base/callback_forward.h"
-#include "base/id_map.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "content/common/content_export.h"
-
-namespace base {
-class SingleThreadTaskRunner;
-}
-
-namespace blink {
-struct WebNotificationData;
-class WebNotificationDelegate;
-}
-
-namespace content {
-
-class PendingNotification;
-class PendingNotificationsTrackerTest;
-struct NotificationResources;
-
-// Tracks all pending Web Notifications as PendingNotification instances. The
-// pending notifications (and their associated data) are stored in this class.
-// The pending notification tracker is owned by the NotificationManager, and
-// lives on the thread that manager has been associated with.
-class CONTENT_EXPORT PendingNotificationsTracker {
- public:
-  explicit PendingNotificationsTracker(
-      const scoped_refptr<base::SingleThreadTaskRunner>& main_task_runner);
-  ~PendingNotificationsTracker();
-
-  // Type definition for the callback signature which is to be invoked when the
-  // resources associated with a notification have been fetched.
-  using ResourcesCallback = base::Callback<void(const NotificationResources&)>;
-
-  // Adds a pending notification for which to fetch resources. The |delegate|
-  // may be null, but non-null values can be used to cancel the fetches.
-  // Resource fetches will be started asynchronously on the main thread.
-  void FetchResources(const blink::WebNotificationData& notification_data,
-                      blink::WebNotificationDelegate* delegate,
-                      const ResourcesCallback& resources_callback);
-
-  // Cancels all pending and in-flight fetches for the notification identified
-  // by |delegate|, which may not be null. Returns whether the notification was
-  // cancelled.
-  bool CancelResourceFetches(blink::WebNotificationDelegate* delegate);
-
- private:
-  friend class PendingNotificationsTrackerTest;
-
-  // To be called on the worker thread when the pending notification
-  // identified by |notification_id| has finished fetching the resources. The
-  // |delegate| may be null.
-  void FetchesFinished(blink::WebNotificationDelegate* delegate,
-                       int notification_id,
-                       const ResourcesCallback& resources_callback);
-
-  // Used to generate ids for tracking pending notifications.
-  int32_t next_notification_id_;
-
-  scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
-
-  // The notifications whose resources are still being fetched.
-  IDMap<PendingNotification, IDMapOwnPointer> pending_notifications_;
-
-  // In order to be able to cancel pending page notifications by delegate, store
-  // a mapping of the delegate to the pending notification id as well.
-  std::map<blink::WebNotificationDelegate*, int> delegate_to_pending_id_map_;
-
-  DISALLOW_COPY_AND_ASSIGN(PendingNotificationsTracker);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_CHILD_NOTIFICATIONS_PENDING_NOTIFICATIONS_TRACKER_H_