HTTP loading tests and package root support

tests/standalone/http_launch_data/packages/simple/simple.dart

Index: tests/standalone/http_launch_data/packages/simple/simple.dart
diff --git a/tests/language/reexport_core_helper.dart b/tests/standalone/http_launch_data/packages/simple/simple.dart
similarity index 80%
copy from tests/language/reexport_core_helper.dart
copy to tests/standalone/http_launch_data/packages/simple/simple.dart
index 49798aa483b6602490991fcd368dda37d9566f20..b571f9d53d583067fa97ba4d61d852a0656f0e76 100644
--- a/tests/language/reexport_core_helper.dart
+++ b/tests/standalone/http_launch_data/packages/simple/simple.dart
@@ -2,7 +2,6 @@
 // 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 reexport_core_helper;
-
-export 'dart:core';
+library simple;
 
+String getSimpleString() => 'hello';