Teach the Observatory about MirrorReferences.

runtime/bin/vmservice/observatory/test/mirror_references_test.dart

+// 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.
+
+library vm_references_test;
+
+import 'dart:async';
+import 'dart:mirrors';
+import 'package:observatory/service_io.dart';
+import 'package:unittest/unittest.dart';
+import 'test_helper.dart';
+
+class Foo { }
+
+Foo foo;
+var /*MirrorReference*/ ref;
+
+void script() {
+  foo = new Foo();
+  ClassMirror fooClassMirror = reflectClass(Foo);
+  InstanceMirror fooClassMirrorMirror = reflect(fooClassMirror);
+  LibraryMirror libmirrors = fooClassMirrorMirror.type.owner;
+  ref = reflect(fooClassMirror).getField(MirrorSystem.getSymbol('_reflectee', libmirrors)).reflectee;
+}
+
+var tests = [
+
+(Isolate isolate) =>
+  isolate.rootLib.load().then((Library lib) {
+    ServiceMap fooField = lib.variables.singleWhere((v) => v.name == 'foo');
+    Instance foo = fooField['value'];
+    ServiceMap refField = lib.variables.singleWhere((v) => v.name == 'ref');
+    Instance ref = refField['value'];
+
+    expect(foo.isMirrorReference, isFalse);
+    expect(ref.isMirrorReference, isTrue);
+    expect(ref.referent, isNull);
+    return ref.load().then((Instance loadedRef) {
+      expect(loadedRef.referent, isNotNull);
+      expect(loadedRef.referent.name, equals('Foo'));
+      expect(loadedRef.referent, equals(foo.clazz));
+    });
+  }),
+
+];
+
+main(args) => runIsolateTests(args, tests, testeeBefore: script);