Adding Angular and dependent packages for testing

third_party/pkg/update_di.sh

 #!/bin/bash
 # Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # bail on error
 set -e
 
-DIR=$( cd $( dirname "${BASH_SOURCE[0]}" ) && pwd )
+readonly DIR=$( cd $( dirname "${BASH_SOURCE[0]}" ) && pwd )
 echo $DIR
 pushd $DIR > /dev/null
 
 echo "*** Deleting old version"
 rm -rf di
 
 echo "*** Syncing code"
 git clone https://github.com/angular/di.dart di
 
 pushd di
-REVISION=`git rev-parse HEAD`
+readonly REVISION=`git rev-parse HEAD`
 rm -rf .git
 
 echo "*** Generating static injector test files"
 pub install
-DART_SDK=../../../out/ReleaseIA32/dart-sdk
+readonly DART_SDK=../../../out/ReleaseIA32/dart-sdk
 $DART_SDK/bin/dart \
     --package-root=$DART_SDK/../packages/ \
     bin/generator.dart \
     $DART_SDK/ \
     test/main.dart \
     di.tests.Injectable \
     test/type_factories_gen.dart \
     packages/
 
 echo "*** Cleaning up packages"
 rm -rf packages
 
+echo "${REVISION}" >> REVISION
 echo "*** Updated to revision $REVISION"