Support for extending native classes

tests/compiler/dart2js_native/subclassing_3_test.dart

+// 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.
+
+import "package:expect/expect.dart";
+import 'dart:_js_helper' show Creates, setNativeSubclassDispatchRecord;
+import 'dart:_interceptors' show Interceptor, findInterceptorForType;
+
+// Test calling convention of methods introduced on subclasses of native
+// class of mixin.
+
+doFoo(r, x) => '$x,${r.oof()},${r.miz()}';
+
+class M {
+  miz() => 'M';
+}
+
+class N native "N" {
+  foo(x) => (doFoo)(this, x);
+}
+
+class A extends N {}
+
+class B extends A with M {
+  // [oof] is introduced only on this subclass of a native class.  It should
+  // have interceptor calling convention.
+  oof() => 'B';
+  // [miz] is introduced only on the mixin-application A+M.
+}
+
+B makeB() native;
+
+@Creates('=Object')
+getBPrototype() native;
+
+void setup() native r"""
+function B() {}
+makeB = function(){return new B;};
+
+getBPrototype = function(){return B.prototype;};
+""";
+
+main() {
+  setup();
+
+  setNativeSubclassDispatchRecord(getBPrototype(), findInterceptorForType(B));
+
+  B b = makeB();
+  Expect.equals('1,B,M', b.foo(1));
+}