Add new owners to various sub-projects.

Test: treehugger
Change-Id: Ia2a99c0499633ccc5d23c37a1ec93867c876d637
diff --git a/rootdir/OWNERS b/rootdir/OWNERS
index ca22eb8..5d0d673 100644
--- a/rootdir/OWNERS
+++ b/rootdir/OWNERS
@@ -1,5 +1,7 @@
+bowgotsai@google.com
 ccross@google.com
+dvander@google.com
+elsk@google.com
 jeffv@google.com
 jiyong@google.com
 smoreland@google.com
-tomcherry@google.com