[NTP] Allow reordering of apps via drag and drop.

chrome/common/notification_type.h

Index: chrome/common/notification_type.h
diff --git a/chrome/common/notification_type.h b/chrome/common/notification_type.h
index 54f2a36cd234b6b55c7e2549a8d919b6a8132b60..fadff2f85502f9a6681b9b2bc1a71a049d699146 100644
--- a/chrome/common/notification_type.h
+++ b/chrome/common/notification_type.h
@@ -1305,6 +1305,9 @@ class NotificationType {
     // |webkit_glue::PasswordForm|s that were affected.
     LOGINS_CHANGED,
 
+    // Sent when the applications in the NTP app launcher have been reordered.
+    EXTENSION_LAUNCHER_REORDERED,
+
     // Count (must be last) ----------------------------------------------------
     // Used to determine the number of notification types.  Not valid as
     // a type parameter when registering for or posting notifications.