Adding Angular's DI package & Dart unittests which test it.

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 )
+echo $DIR
+pushd $DIR > /dev/null
+
+echo "*** Deleting old version"
+rm -rf di
+
+echo "*** Syncing code"
+git clone https://github.com/angular/di.dart di
+
+pushd di
+REVISION=`git rev-parse HEAD`
+rm -rf .git
+
+echo "*** Generating static injector test files"
+pub install
+DART_SDK=../../../out/ReleaseIA32/dart-sdk
+$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 "*** Updated to revision $REVISION"