Adds a flag "use_instrumented_libraries" and corresponding target with 2 simple libs

third_party/instrumented_libraries/fix_rpaths.sh

Index: third_party/instrumented_libraries/fix_rpaths.sh
===================================================================
--- third_party/instrumented_libraries/fix_rpaths.sh	(revision 0)
+++ third_party/instrumented_libraries/fix_rpaths.sh	(revision 0)
@@ -0,0 +1,22 @@
+#!/bin/bash
+# Copyright (c) 2013 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.
+
+# Changes all RPATHs in a given directory from XORIGIN to $ORIGIN
+# See the comment about XORIGIN in download_build_install.sh
+
+# Fixes rpath from XORIGIN to $ORIGIN in a single file $1.
+function fix_rpath {
+  chrpath -r $(chrpath $1 | cut -d " " -f 2 | sed s/XORIGIN/\$ORIGIN/g \
+    | sed s/RPATH=//g) $1 > /dev/null
+}
+
+for i in $(find $1 | grep "\.so$"); do
+  fix_rpath $i
+done
+
+# Mark that rpaths are fixed.
+# This file is used by GYP as 'output' to mark that RPATHs are already fixed
+# for incremental builds.
+touch $1/rpaths.fixed.txt