Make pub's binstubs resilient to changes in snapshot format.

sdk/lib/_internal/pub/test/cache/repair/handles_corrupted_global_lockfile_test.dart

Index: sdk/lib/_internal/pub/test/cache/repair/handles_corrupted_global_lockfile_test.dart
diff --git a/sdk/lib/_internal/pub/test/cache/repair/handles_corrupted_global_lockfile_test.dart b/sdk/lib/_internal/pub/test/cache/repair/handles_corrupted_global_lockfile_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..098f60270e862f26723f61bfd9adff8245f6d3a5
--- /dev/null
+++ b/sdk/lib/_internal/pub/test/cache/repair/handles_corrupted_global_lockfile_test.dart
@@ -0,0 +1,25 @@
+// Copyright (c) 2014, 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 pub_tests;
+
+import 'package:scheduled_test/scheduled_test.dart';
+
+import '../../descriptor.dart' as d;
+import '../../test_pub.dart';
+
+main() {
+  initConfig();
+  integration('handles a corrupted global lockfile', () {
+    d.dir(cachePath, [
+      d.dir('global_packages/foo', [
+        d.file('pubspec.lock', 'junk')
+      ])
+    ]).create();
+
+    schedulePub(args: ["cache", "repair"],
+        error: contains('Failed to reactivate foo:'),
+        output: contains('Failed to reactivate 1 package.'));
+  });
+}