Added support for image notifications.

ui/message_center/notification_list.h

Index: ui/message_center/notification_list.h
diff --git a/ui/message_center/notification_list.h b/ui/message_center/notification_list.h
index 575f9ce6aef33f02d40686879734602f1c4c9751..87cf509dc5a7231b94c837496fee0430e5f60e72 100644
--- a/ui/message_center/notification_list.h
+++ b/ui/message_center/notification_list.h
@@ -57,6 +57,7 @@ class MESSAGE_CENTER_EXPORT NotificationList {
     // Images fetched asynchronously
     gfx::ImageSkia primary_icon;
     gfx::ImageSkia secondary_icon;
+    gfx::ImageSkia image;
 
     bool is_read;  // True if this has been seen in the message center
     bool shown_as_popup;  // True if this has been shown as a popup notification
@@ -132,6 +133,9 @@ class MESSAGE_CENTER_EXPORT NotificationList {
   bool SetNotificationSecondaryIcon(const std::string& id,
                                     const gfx::ImageSkia& image);
 
+  // Returns true if the notification exists and was updated.
+  bool SetNotificationImage(const std::string& id, const gfx::ImageSkia& image);
+
   bool HasNotification(const std::string& id);
 
   // Returns false if the first notification has been shown as a popup (which