Pass the build type to ant build

build/android/content_shell_ant_helper.sh

Index: build/android/content_shell_ant_helper.sh
diff --git a/build/android/content_shell_ant_helper.sh b/build/android/content_shell_ant_helper.sh
new file mode 100755
index 0000000000000000000000000000000000000000..26cb3657db8a5773971a710694c51a77022b4eef
--- /dev/null
+++ b/build/android/content_shell_ant_helper.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# 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="$(tr '[A-Z]' '[a-z]' <<< "${6}")"
+
+exec "${1}" "${2}" "${3}" "${4}" "${5}" "${buildtype}"