Change url to uri on LibraryMirror.

tests/lib/mirrors/library_uri_package_test.dart

Index: tests/lib/mirrors/library_uri_package_test.dart
diff --git a/tests/lib/mirrors/library_uri_package_test.dart b/tests/lib/mirrors/library_uri_package_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..bcd10853bf4450cd798cd52af09cd396c8cfa345
--- /dev/null
+++ b/tests/lib/mirrors/library_uri_package_test.dart
@@ -0,0 +1,26 @@
+// Copyright (c) 2011, 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.
+
+// Test library uri for a library read as a package .
+
+library MirrorsTest;
+
+import 'dart:mirrors';
+import 'dart:uri';
+import 'package:args/args.dart';
+import '../../../pkg/unittest/lib/unittest.dart';
+
+testLibraryUri(var value, Uri expectedUri) {
+  var valueMirror = reflect(value);
+  ClassMirror valueClass = valueMirror.type;
+  LibraryMirror valueLibrary = valueClass.owner;
+  expect(valueLibrary.uri, equals(expectedUri));
+}
+
+main() {
+  var mirrors = currentMirrorSystem();
+  test("Test package library uri", () {
+    testLibraryUri(new ArgParser(), Uri.parse('package:args/args.dart'));
+  });
+}