Add synchronous directory listing to dart:io Directory.

tests/standalone/io/directory_list_nonexistent_test.dart

+// 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.
+//
+// Directory listing test that tests listSync on a missing directory.
+//
+// TODO(7157): Merge this test into directory_test.dart testListNonExistent()
+// when it no longer crashes on Windows, when issue 7157 is resolved.
+
+import "dart:io";
+import "dart:isolate";
+
+void testListNonExistent() {
+  new Directory("").createTemp().then((d) {
+    d.delete().then((ignore) {
+      Expect.throws(() => d.listSync(), (e) => e is DirectoryIOException);
+      Expect.throws(() => d.listSync(recursive: true),
+                    (e) => e is DirectoryIOException);
+    });
+  });
+}
+
+void testListTooLongName() {
+  new Directory("").createTemp().then((d) {
+    var subDirName = 'subdir';
+    var subDir = new Directory("${d.path}/$subDirName");
+    subDir.create().then((ignore) {
+      // Construct a long string of the form
+      // 'tempdir/subdir/../subdir/../subdir'.
+      var buffer = new StringBuffer();
+      buffer.add(subDir.path);
+      for (var i = 0; i < 1000; i++) {
+        buffer.add("/../${subDirName}");
+      }
+      var long = new Directory("${buffer.toString()}");
+      Expect.throws(() => long.listSync(),
+                    (e) => e is DirectoryIOException);
+      Expect.throws(() => long.listSync(recursive: true),
+                    (e) => e is DirectoryIOException);
+    });
+  });
+}
+
+void main() {
+  testListNonExistent();
+  testListTooLongName();
+}