Add METADATA to error_prone: contains GPL+LGPL=RESTRICTED am: 397d0d8c94

Change-Id: Id7db2a12c8b89567dc865460e8219fa14337f1e5
diff --git a/METADATA b/METADATA
new file mode 100644
index 0000000..6d8601b
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,3 @@
+third_party {
+  license_type: RESTRICTED
+}