Fetch notification action icons and pass them through in resources.

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 <vector>
@@ skipping 15 matching lines @@
 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> {
-  using ImageLoadCompletedCallback = base::Callback<void(int, const SkBitmap&)>;
-
  public:
   NotificationImageLoader(
       const ImageLoadCompletedCallback& callback,
-      const scoped_refptr<base::SingleThreadTaskRunner>& worker_task_runner);
+      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(int notification_id, const GURL& image_url);
+  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,
@@ skipping 15 matching lines @@
   // 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_thread_task_runner_;
+  scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
 
-  int notification_id_;
   bool completed_;
 
   scoped_ptr<blink::WebURLLoader> url_loader_;
 
   std::vector<uint8_t> buffer_;
 
   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_