Reaply "Use a real package-root for all of our samples (and tests inside a package) instead of buil…

dart/tools/test.dart

Index: dart/tools/test.dart
diff --git a/dart/tools/test.dart b/dart/tools/test.dart
index a8cd20c1f654b4c4b99f5bb251e566191db43276..278dc74f0471325468209eab4580d443b0e7b667 100755
--- a/dart/tools/test.dart
+++ b/dart/tools/test.dart
@@ -194,6 +194,11 @@ void testConfigurations(List<Map> configurations) {
       } else if (conf['compiler'] == 'none' &&
                  conf['runtime'] == 'vm' &&
                  key == 'pkgbuild') {
+        if (!conf['use_repository_packages'] && !conf['use_public_packages']) {
+          print("You need to use either --use-repository-packages or "
+                "--use-public-packages with the pkgbuild test suite!");
+          exit(1);
+        }
         if (!conf['use_sdk']) {
           print("Running the 'pkgbuild' test suite requires "
                 "passing the '--use-sdk' to test.py");