VM: Support calling through getters in InstanceMirror.delegate. Implement without accessing private…

tests/lib/mirrors/delegate_call_through_getter_test.dart

Index: tests/lib/mirrors/delegate_call_through_getter_test.dart
diff --git a/tests/lib/mirrors/delegate_call_through_getter_test.dart b/tests/lib/mirrors/delegate_call_through_getter_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..4d0d088ad7b44b7071efc7f14779d1a273757963
--- /dev/null
+++ b/tests/lib/mirrors/delegate_call_through_getter_test.dart
@@ -0,0 +1,45 @@
+// Copyright (c) 2013, 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 test.invoke_call_through_getter;
+
+import 'dart:mirrors';
+
+import 'package:expect/expect.dart';
+
+class FakeFunctionCall {
+  call(x, y) => '1 $x $y';
+}
+class FakeFunctionNSM {
+  noSuchMethod(msg) => msg.positionalArguments.join(', ');
+}
+
+class C {
+  get fakeFunctionCall => new FakeFunctionCall();
+  get fakeFunctionNSM => new FakeFunctionNSM();
+  get closure => (x, y) => '2 $this $x $y';
+  get closureOpt => (x, y, [z, w]) => '3 $this $x $y $z $w';
+  get closureNamed => (x, y, {z, w}) => '4 $this $x $y $z $w';
+  get notAClosure => 'Not a closure';
+  noSuchMethod(msg) => 'DNU';
+
+  toString() => 'C';
+}
+
+class Forwarder {
+  noSuchMethod(msg) => reflect(new C()).delegate(msg);
+}
+
+main() {
+  var f = new Forwarder();
+
+  Expect.equals('1 5 6', f.fakeFunctionCall(5, 6));
+  Expect.equals('7, 8', f.fakeFunctionNSM(7, 8));
+  Expect.equals('2 C 9 10', f.closure(9, 10));
+  Expect.equals('3 C 11 12 13 null', f.closureOpt(11, 12, 13));
+  Expect.equals('4 C 14 15 null 16', f.closureNamed(14, 15, w: 16));
+  Expect.equals('DNU', f.doesNotExist(17, 18));
+  Expect.throws(() => f.closure('wrong arity'), (e) => e is NoSuchMethodError);
+  Expect.throws(() => f.notAClosure(), (e) => e is NoSuchMethodError);
+}