Add Nan to OWNERS

Test: none
Change-Id: Ifdec77927a4b56c65fa09c688a595e984d532838
diff --git a/OWNERS b/OWNERS
index 89b446a..7a59f70 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,2 +1,3 @@
 ccross@android.com
 dwillemsen@google.com
+nanzhang@google.com