Pass the build type to ant build

content/shell/content_shell_ant_helper.sh

Index: content/shell/content_shell_ant_helper.sh
diff --git a/content/shell/content_shell_ant_helper.sh b/content/shell/content_shell_ant_helper.sh
new file mode 100755
index 0000000000000000000000000000000000000000..167ed3b8209ff598f71a7de1e6b6af6921063ef6
--- /dev/null
+++ b/content/shell/content_shell_ant_helper.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+set -eu
+
+# A helper script to help convert the values of the fifth parameter for
+# ant building: 'Debug' -> 'debug'; 'Release' -> 'release'.
+# It's used by content/content_shell.gypi
+
+buildtype="$(echo "${6}" | tr '[A-Z]' '[a-z]')"
+
+# TODO(yongsheng): enable build type by adding "${buildtype}" into the
+# end of parameter list once the workflow is ready to support release
+# mode.
+exec "${1}" "${2}" "${3}" "${4}" "${5}"