Use NotificationResources instead of a bare SkBitmap.

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 "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.

[Peter Beverloo, 2016/01/26 15:43:23]

Perhaps add a TODO to clarify that more resources are intended to be added here?

[Michael van Ouwerkerk, 2016/01/26 16:24:21]

Done.

+struct CONTENT_EXPORT NotificationResources {
+  // Main icon for the notification. The bitmap may be empty if e.g. fetching it
+  // has failed.

[Peter Beverloo, 2016/01/26 15:43:23]

"The bitmap may be empty if the developer did not provide an icon, or fetching
of the icon failed."

[Michael van Ouwerkerk, 2016/01/26 16:24:21]

Done.

+  SkBitmap notification_icon;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_COMMON_NOTIFICATION_RESOURCES_H_