Add Notification images (Blink + desktop implementation)

third_party/WebKit/public/platform/modules/notifications/WebNotificationResources.h

Index: third_party/WebKit/public/platform/modules/notifications/WebNotificationResources.h
diff --git a/third_party/WebKit/public/platform/modules/notifications/WebNotificationResources.h b/third_party/WebKit/public/platform/modules/notifications/WebNotificationResources.h
index d34e72a83130c92c658372e8eca90aeda1150097..af62e47786caf3bbddb46b074cd87d4d7dfe01ac 100644
--- a/third_party/WebKit/public/platform/modules/notifications/WebNotificationResources.h
+++ b/third_party/WebKit/public/platform/modules/notifications/WebNotificationResources.h
@@ -12,6 +12,10 @@ namespace blink {
 
 // Structure representing the resources associated with a Web Notification.
 struct WebNotificationResources {
+    // Content image for the notification. The bitmap may be empty if the
+    // developer did not provide an 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 icon;