Added getField/setField to ObjectMirror. For InstanceMirrors, this get/sets

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.dart");
+#import("dart:mirrors");
+#import("../../../lib/unittest/unittest.dart");
+
+var topLevelField;
+
+class Class {
+  var field;
+  static var staticField;
+}
+
+testFieldAccess(mirrors) {
+  var instance = new Class();
+
+  var libMirror = mirrors.rootLibrary;
+  var classMirror = libMirror.classes()["Class"];
+  var instMirror = mirrors.mirrorOf(instance);
+
+  libMirror.setField('topLevelField', 42);
+  var future = libMirror.getField('topLevelField');
+  future.then(expectAsync1((resultMirror) {
+    expect(resultMirror.reflectee, equals(42));
+    expect(topLevelField, equals(42));   
+  }));
+  
+  classMirror.setField('staticField', 43);
+  future = classMirror.getField('staticField');
+  future.then(expectAsync1((resultMirror) {
+    expect(resultMirror.reflectee, equals(43));
+    expect(Class.staticField, equals(43)); 
+  }));
+
+  instMirror.setField('field', 44);
+  future = instMirror.getField('field');
+  future.then(expectAsync1((resultMirror) {
+    expect(resultMirror.reflectee, equals(44));
+    expect(instance.field, equals(44)); 
+  }));
+}
+
+main() {
+  var mirrors = currentMirrorSystem();
+
+  test("Test field access", () { testFieldAccess(mirrors); });
+}
+