Service isolate rework take 2

runtime/bin/builtin_common.cc

+// Copyright (c) 2015, 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.
+
+#include <stdio.h>
+
+#include "include/dart_api.h"
+
+#include "bin/builtin.h"
+#include "bin/dartutils.h"
+#include "bin/platform.h"
+
+namespace dart {
+namespace bin {
+
+void Builtin::SetLoadPort(Dart_Port port) {
+  load_port_ = port;
+  ASSERT(load_port_ != ILLEGAL_PORT);
+  Dart_Handle field_name = DartUtils::NewString("_loadPort");
+  ASSERT(!Dart_IsError(field_name));
+  Dart_Handle builtin_lib =
+      Builtin::LoadAndCheckLibrary(Builtin::kBuiltinLibrary);
+  ASSERT(!Dart_IsError(builtin_lib));
+  Dart_Handle send_port = Dart_GetField(builtin_lib, field_name);
+  ASSERT(!Dart_IsError(send_port));
+  if (!Dart_IsNull(send_port)) {
+    // Already created and set.
+    return;
+  }
+  send_port = Dart_NewSendPort(load_port_);
+  ASSERT(!Dart_IsError(send_port));
+  Dart_Handle result = Dart_SetField(builtin_lib, field_name, send_port);
+  ASSERT(!Dart_IsError(result));
+}
+
+}  // namespace bin
+}  // namespace dart