Add owners to GameManagerTests

Bug: b/243448953
Test: n/a
Change-Id: I78e7062762db4bc41b392b3f80888c420fe5d93e
diff --git a/GAME_MANAGER_OWNERS b/GAME_MANAGER_OWNERS
index 502a9e36..b65c43a 100644
--- a/GAME_MANAGER_OWNERS
+++ b/GAME_MANAGER_OWNERS
@@ -1,2 +1,3 @@
 lpy@google.com
-timvp@google.com
+chingtangyu@google.com
+xwxw@google.com