Add XML persistence code generation tool.

Test: m xmlpersistence_cli && xmlpersistence_cli
Change-Id: Ia54739e99f52c3ab7125f21b1bc306a474f6bf68
diff --git a/tools/xmlpersistence/OWNERS b/tools/xmlpersistence/OWNERS
new file mode 100644
index 0000000..4f4d06a
--- /dev/null
+++ b/tools/xmlpersistence/OWNERS
@@ -0,0 +1 @@
+zhanghai@google.com