Add support for importing using "package:" to the standalone VM.

tests/standalone/src/package/PackageTest.dart

Index: tests/standalone/src/package/PackageTest.dart
diff --git a/tests/standalone/src/package/PackageTest.dart b/tests/standalone/src/package/PackageTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..b304f6d0f6b5b64e6c59dd2b097233706fc2c32d
--- /dev/null
+++ b/tests/standalone/src/package/PackageTest.dart
@@ -0,0 +1,17 @@
+// Copyright (c) 2012, 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.
+
+#library('package_test');
+
+#import('package:lib1.dart');
+#import('package:shared.dart');
+
+void main() {
+  output = 'main';
+  // Call an imported lib, which will in turn call some others.
+  lib1();
+
+  // Make sure they were all reached successfully.
+  Expect.equals(output, 'main|lib1|lib2|lib3');
+}