Access to imports in the VM's runtime mirrors. Extend test coverage of the source mirrors.

tests/compiler/dart2js/mirrors/library_imports_prefixed_show_hide_test.dart

Index: tests/compiler/dart2js/mirrors/library_imports_prefixed_show_hide_test.dart
diff --git a/tests/compiler/dart2js/mirrors/library_imports_prefixed_show_hide_test.dart b/tests/compiler/dart2js/mirrors/library_imports_prefixed_show_hide_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..910dde5d3de6b188381058ed15c1235d1682ba0c
--- /dev/null
+++ b/tests/compiler/dart2js/mirrors/library_imports_prefixed_show_hide_test.dart
@@ -0,0 +1,17 @@
+// 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.
+
+import "dart:mirrors";
+
+import "package:async_helper/async_helper.dart";
+
+import "mirrors_test_helper.dart";
+import "../../../lib/mirrors/library_imports_prefixed_show_hide_test.dart";
+
+main() {
+  asyncTest(() => analyze("library_imports_prefixed_show_hide_test.dart").
+      then((MirrorSystem mirrors) {
+    test(mirrors);
+  }));
+}