Add implementation class of InvocationMirror for VM.

runtime/lib/invocation_mirror_patch.dart

+// Copyright (c) 2012, 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.
+
+class _InvocationMirror implements InvocationMirror {
+  static final int METHOD = 0;
+  static final int GETTER = 1;
+  static final int SETTER = 2;
+
+  final String methodName;
+  final List positionalArguments;
+  final Map<String,dynamic> namedArguments = null;
+
+  final int _type;
+
+  _InvocationMirror(this.methodName, this._type, this.positionalArguments);
+
+  bool get isMethod => _type == METHOD;
+  bool get isAccessor => _type != METHOD;
+  bool get isGetter => _type == GETTER;
+  bool get isSetter => _type == SETTER;
+
+  invokeOn(Object receiver) {
+    throw new UnsupportedOperation("invokeOn not implemented yet");
+  }
+}
+