Implement InvocationMirror.invokeOn method in the vm (issue 7227).

tests/language/invocation_mirror_invoke_on_test.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.
+
+// Testing InvocationMirror.invokeOn method; test of issue 7227.
+
+var reachedSetX = 0;
+var reachedGetX = 0;
+var reachedM = 0;
+
+class A {
+
+  set x(val) {
+    reachedSetX = val;
+  }
+
+  get x {
+    reachedGetX = 1;
+  }
+
+  m() { reachedM = 1; }
+}
+
+class B {
+  final a = new A();
+  noSuchMethod(mirror) => mirror.invokeOn(a);
+}
+
+main () {
+  var b = new B();
+  b.x = 10;
+  Expect.equals(10, reachedSetX);
+  b.x;
+  Expect.equals(1, reachedGetX);
+  b.m();
+  Expect.equals(1, reachedM);
+}