Change url to uri on LibraryMirror.

tests/lib/mirrors/mirrors_test.dart

 // 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.
 
 // TODO(rmacnak): Move the existing mirror tests here (a place for
 // cross-implementation tests).
 
 library MirrorsTest;
 import "dart:mirrors";
 import "../../../pkg/unittest/lib/unittest.dart";
+import 'dart:uri';
 
 var topLevelField;
 
 class Class<T> {
   Class() { this.field = "default value"; }
   Class.withInitialValue(this.field);
   var field;
   static var staticField;
   m(a, b, c) => {"a": a, "b": b, "c": c};
 }
@@ skipping 123 matching lines @@
 
   expect(methodMirror.simpleName, equals(const Symbol('testNames')));
   expect(methodMirror.qualifiedName,
          equals(const Symbol('MirrorsTest.testNames')));
 
   expect(variableMirror.simpleName, equals(const Symbol('field')));
   expect(variableMirror.qualifiedName,
          equals(const Symbol('MirrorsTest.Class.field')));
 }
 
+testLibraryUri(var value, bool check(Uri)) {
+  var valueMirror = reflect(value);
+  ClassMirror valueClass = valueMirror.type;
+  LibraryMirror valueLibrary = valueClass.owner;
+  expect(check(valueLibrary.uri), isTrue);
+}
+
 main() {
   var mirrors = currentMirrorSystem();
   test("Test reflective method invocation", () { testInvoke(mirrors); });
   test("Test field access", () { testFieldAccess(mirrors); });
   test("Test closure mirrors", () { testClosureMirrors(mirrors); });
   test("Test invoke constructor", () { testInvokeConstructor(mirrors); });
   test("Test reflect type", () { testReflectClass(mirrors); });
   test("Test simple and qualifiedName", () { testNames(mirrors); });
+  test("Test current library uri", () {
+    testLibraryUri(new Class(),
+      (Uri uri) => uri.path.endsWith('/mirrors_test.dart'));
+  });
+  test("Test dart library uri", () {
+    testLibraryUri("test", (Uri uri) => uri == Uri.parse('dart:core'));
+  });
 }