Add some people to OWNERS file

Change-Id: I1a7add363f1ef8833e3ac56e9daa754b039561c2
diff --git a/OWNERS b/OWNERS
index 0716d33..be3c684 100644
--- a/OWNERS
+++ b/OWNERS
@@ -6,4 +6,6 @@
 mpq@google.com
 jminjie@google.com
 shuoq@google.com
-
+hallliu@google.com
+tgunn@google.com
+breadley@google.com