owners: add matloob as secondary owner for tools

Change-Id: Ic277de82ba18b6bc3b652328a141c1bd4604323b
Reviewed-on: https://go-review.googlesource.com/c/build/+/188058
Reviewed-by: Ian Cottrell <iancottrell@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
diff --git a/devapp/owners/table.go b/devapp/owners/table.go
index acc5393..5dcc17e 100644
--- a/devapp/owners/table.go
+++ b/devapp/owners/table.go
@@ -656,7 +656,8 @@
 		Primary: []Owner{rstambler, iancottrell},
 	},
 	"tools": {
-		Primary: []Owner{iancottrell},
+		Primary:   []Owner{iancottrell},
+		Secondary: []Owner{matloob},
 	},
 	"playground": {
 		Secondary: []Owner{ysmolsky},