diff --git a/mod_for_test_scripts/500installPatch b/mod_for_test_scripts/500installPatch
new file mode 100755
index 0000000000..0a53019cae
--- /dev/null
+++ b/mod_for_test_scripts/500installPatch
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+# Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Install patch.
+dpkg --install /modify_build/patch_*.deb
+
diff --git a/mod_for_test_scripts/b500patch b/mod_for_test_scripts/b500patch
new file mode 100644
index 0000000000..fcac54ce30
--- /dev/null
+++ b/mod_for_test_scripts/b500patch
@@ -0,0 +1,7 @@
+# Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+sudo cp "${DEFAULT_IMG_MIRROR#*://}"/pool/main/p/patch/patch_*.deb \
+    "${ROOT_FS_DIR}/modify_build"
+