add custom_element package

pkg/custom_element/test/analyzer_test.dart

Index: pkg/custom_element/test/analyzer_test.dart
diff --git a/samples/tests/samples/standalone/time_test.dart b/pkg/custom_element/test/analyzer_test.dart
similarity index 61%
copy from samples/tests/samples/standalone/time_test.dart
copy to pkg/custom_element/test/analyzer_test.dart
index 32a8726ccaba707e59d14c9eb5589b446682c6d3..1ac251bd58449c2510ebab6d5a33948b91939785 100644
--- a/samples/tests/samples/standalone/time_test.dart
+++ b/pkg/custom_element/test/analyzer_test.dart
@@ -2,13 +2,12 @@
 // 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 '../../../time/time_server.dart' as time;
+library custom_element.test.analyzer_test;
+
+import 'package:custom_element/custom_element.dart';
 
 // @static-clean
 
-/**
- * This test exists to ensure that the time sample compiles without errors.
- */
+// This test ensures CustomElement compiles without errors.
 void main() {
-
 }