Separate the NTP app ordering from the app list app ordering

sync/protocol/app_specifics.proto

Index: sync/protocol/app_specifics.proto
diff --git a/sync/protocol/app_specifics.proto b/sync/protocol/app_specifics.proto
index a7f09ec1be197369b5170c402c699554e274acae..b3c922e3b0531547f433cc3b6081f127b8d12f34 100644
--- a/sync/protocol/app_specifics.proto
+++ b/sync/protocol/app_specifics.proto
@@ -47,7 +47,7 @@ message AppSpecifics {
   optional ExtensionSpecifics extension = 1;
 
   // Notification settings.
-  optional AppNotificationSettings notification_settings = 2; 
+  optional AppNotificationSettings notification_settings = 2;
 
   // This controls where on a page this application icon will appear.
   optional string app_launch_ordinal = 3;
@@ -56,5 +56,8 @@ message AppSpecifics {
   // This values only provide the order within the application pages, not within
   // all of the panels in the NTP.
   optional string page_ordinal = 4;
+
+  // This specifies where the application will appear in the app list.
+  optional string app_list_ordinal = 5;
 }