Add RawReceivePort to dart2js.

tests/isolate/raw_port_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.
+
+// Test RawReceivePort.
+
+library raw_port_test;
+import 'dart:isolate';
+import 'dart:async';
+import '../../pkg/unittest/lib/unittest.dart';
+
+
+void remote(SendPort port) { port.send("reply"); }
+void remote2(SendPort port) {
+  port.send("reply 1");
+  port.send("reply 2");
+}
+
+main() {
+  test("raw receive", () {
+    RawReceivePort port = new RawReceivePort();
+    Isolate.spawn(remote, port.sendPort);
+    port.handler = expectAsync1((v) {
+      expect(v, "reply");
+      port.close();
+    });
+  });
+  test("raw receive twice - change handler", () {
+    RawReceivePort port = new RawReceivePort();
+    Isolate.spawn(remote2, port.sendPort);
+    port.handler = expectAsync1((v) {
+      expect(v, "reply 1");
+      port.handler = expectAsync1((v) {
+        expect(v, "reply 2");
+        port.close();
+      });
+    });
+  });
+  test("from-raw-port", () {
+    RawReceivePort rawPort = new RawReceivePort();
+    Isolate.spawn(remote, rawPort.sendPort);
+    rawPort.handler = expectAsync1((v) {
+      expect(v, "reply");
+      ReceivePort port = new ReceivePort.fromRawReceivePort(rawPort);
+      Isolate.spawn(remote, rawPort.sendPort);
+      Isolate.spawn(remote, port.sendPort);
+      int ctr = 2;
+      port.listen(expectAsync1((v) {
+                    expect(v, "reply");
+                    ctr--;
+                    if (ctr == 0) port.close();
+                  }, count: 2),
+                  onDone: expectAsync0((){}));
+    });
+  });
+
+}