Add source owners to test owners

Bug: 207582920
Test: N/a
Change-Id: Ie0c8562ad45cfd64445c40dde4e426585c75bdc0
diff --git a/libs/WindowManager/Shell/tests/OWNERS b/libs/WindowManager/Shell/tests/OWNERS
index f49e80a..a244d14 100644
--- a/libs/WindowManager/Shell/tests/OWNERS
+++ b/libs/WindowManager/Shell/tests/OWNERS
@@ -2,3 +2,7 @@
 # includes OWNERS from parent directories
 natanieljr@google.com
 pablogamito@google.com
+
+lbill@google.com
+madym@google.com
+hwwang@google.com