Move notification resource loading from content/child to blink

content/child/notifications/notification_image_loader.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 CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_IMAGE_LOADER_H_
-#define CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_IMAGE_LOADER_H_
-
-#include <stdint.h>
-
-#include <memory>
-#include <vector>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/sequenced_task_runner_helpers.h"
-#include "base/time/time.h"
-#include "third_party/WebKit/public/platform/WebURLLoaderClient.h"
-
-class GURL;
-class SkBitmap;
-
-namespace base {
-class SingleThreadTaskRunner;
-}
-
-namespace blink {
-class WebURL;
-struct WebURLError;
-class WebURLLoader;
-}
-
-namespace content {
-
-struct NotificationImageLoaderDeleter;
-
-// The |image| may be empty if the request failed or the image data could not be
-// decoded.
-using ImageLoadCompletedCallback = base::Callback<void(const SkBitmap& image)>;
-
-// Downloads the image associated with a notification and decodes the received
-// image. This must be completed before notifications are shown to the user.
-// Image downloaders must not be re-used for multiple notifications.
-//
-// All methods, except for the constructor, are expected to be used on the
-// renderer main thread.
-class NotificationImageLoader
-    : public blink::WebURLLoaderClient,
-      public base::RefCountedThreadSafe<NotificationImageLoader,
-                                        NotificationImageLoaderDeleter> {
- public:
-  NotificationImageLoader(
-      const ImageLoadCompletedCallback& callback,
-      const scoped_refptr<base::SingleThreadTaskRunner>& worker_task_runner,
-      const scoped_refptr<base::SingleThreadTaskRunner>& main_task_runner);
-
-  // Asynchronously starts loading |image_url| using a Blink WebURLLoader. Must
-  // only be called on the main thread.
-  void StartOnMainThread(const GURL& image_url);
-
-  // blink::WebURLLoaderClient implementation.
-  void didReceiveData(blink::WebURLLoader* loader,
-                      const char* data,
-                      int data_length,
-                      int encoded_data_length) override;
-  void didFinishLoading(blink::WebURLLoader* loader,
-                        double finish_time,
-                        int64_t total_encoded_data_length) override;
-  void didFail(blink::WebURLLoader* loader,
-               const blink::WebURLError& error) override;
-
- private:
-  friend class base::DeleteHelper<NotificationImageLoader>;
-  friend class base::RefCountedThreadSafe<NotificationImageLoader,
-                                          NotificationImageLoaderDeleter>;
-  friend struct NotificationImageLoaderDeleter;
-
-  ~NotificationImageLoader() override;
-
-  // Invokes the callback on the thread this image loader was started for. When
-  // the thread id is zero (the main document), it will be executed immediately.
-  // For all other threads a task will be posted to the appropriate task runner.
-  void RunCallbackOnWorkerThread();
-
-  // Returns a Skia bitmap, empty if buffer_ was empty or could not be decoded
-  // as an image, or a valid bitmap otherwise.
-  SkBitmap GetDecodedImage() const;
-
-  // Ensures that we delete the image loader on the main thread.
-  void DeleteOnCorrectThread() const;
-
-  ImageLoadCompletedCallback callback_;
-
-  scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner_;
-  scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
-
-  bool completed_;
-
-  std::unique_ptr<blink::WebURLLoader> url_loader_;
-
-  std::vector<uint8_t> buffer_;
-
-  base::TimeTicks start_time_;
-
-  DISALLOW_COPY_AND_ASSIGN(NotificationImageLoader);
-};
-
-struct NotificationImageLoaderDeleter {
-  static void Destruct(const NotificationImageLoader* context) {
-    context->DeleteOnCorrectThread();
-  }
-};
-
-}  // namespace content
-
-#endif  // CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_IMAGE_LOADER_H_