Add iossim testing tool for running iOS unit tests.

testing/iossim/RedirectStdout.sh

+#!/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.
+#
+# This script executes the command given as the first argument and redirects
+# the command's stdout to the file given as the second argument.
+#
+# Example: Write the text 'foo' to a file called out.txt:
+#   RedirectStdout.sh "echo foo" out.txt
+#
+# This script is invoked from iossim.gyp in order to redirect the output of
+# class-dump to a file (because gyp actions don't support redirecting output).
+
+if [ ${#} -ne 2 ] ; then
+  echo "usage: ${0} <command> <output file>"
+  exit 2
+fi
+
+exec $1 > $2