Made notification center notifications collapsed and expandable.

ui/message_center/notification_list.cc

Index: ui/message_center/notification_list.cc
diff --git a/ui/message_center/notification_list.cc b/ui/message_center/notification_list.cc
index ce2712e065209a874640e7f30728bf8b4ffae491..dad4dc95a4ef6e4fbd36870d7df3e729e415c151 100644
--- a/ui/message_center/notification_list.cc
+++ b/ui/message_center/notification_list.cc
@@ -157,7 +157,7 @@ bool NotificationList::SetNotificationIcon(const std::string& notification_id,
   Notifications::iterator iter = GetNotification(notification_id);
   if (iter == notifications_.end())
     return false;
-  (*iter)->set_primary_icon(image);
+  (*iter)->set_icon(image);
   return true;
 }
 
@@ -247,6 +247,12 @@ void NotificationList::MarkSinglePopupAsShown(
   }
 }
 
+void NotificationList::MarkNotificationAsExpanded(const std::string& id) {
+  Notifications::iterator iter = GetNotification(id);
+  if (iter != notifications_.end())
+    (*iter)->set_is_expanded(true);
+}
+
 void NotificationList::SetQuietMode(bool quiet_mode) {
   SetQuietModeInternal(quiet_mode);
   quiet_mode_timer_.reset();