Add Notification images (Blink + desktop implementation)

content/public/common/notification_resources.h

 // Copyright 2016 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_PUBLIC_COMMON_NOTIFICATION_RESOURCES_H_
 #define CONTENT_PUBLIC_COMMON_NOTIFICATION_RESOURCES_H_
 
 #include <vector>
 
 #include "content/common/content_export.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 namespace content {
 
 // Structure to hold the resources associated with a Web Notification.
 struct CONTENT_EXPORT NotificationResources {
   NotificationResources();
   NotificationResources(const NotificationResources& other);
   ~NotificationResources();
 
+  // Image for the notification. The bitmap may be empty if the developer did
+  // not provide a image, or fetching of the image failed.
+  SkBitmap image;
+
   // Main icon for the notification. The bitmap may be empty if the developer
   // did not provide an icon, or fetching of the icon failed.
   SkBitmap notification_icon;
 
   // Badge for the notification. The bitmap may be empty if the developer
   // did not provide a badge, or fetching of the badge failed.
   SkBitmap badge;
 
   // Icons for the actions. A bitmap may be empty if the developer did not
   // provide an icon, or fetching of the icon failed.
   std::vector<SkBitmap> action_icons;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_NOTIFICATION_RESOURCES_H_