app/appengine: add x/debug subrepo

Change-Id: I71edbdeee94e69f2acefb3a4474e558bf33a46df
Reviewed-on: https://go-review.googlesource.com/115057
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/app/appengine/dash.go b/app/appengine/dash.go
index 97f055f..e5dfa6c 100644
--- a/app/appengine/dash.go
+++ b/app/appengine/dash.go
@@ -106,6 +106,11 @@
 	},
 	{
 		Kind: "subrepo",
+		Name: "debug",
+		Path: "golang.org/x/debug",
+	},
+	{
+		Kind: "subrepo",
 		Name: "exp",
 		Path: "golang.org/x/exp",
 	},