Fix mac build breakage in dart_api_impl.cc

runtime/vm/dart_api_impl.cc

 // 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.
 
 #include "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
@@ skipping 1164 matching lines @@
 DART_EXPORT Dart_Handle Dart_PostMessage(Dart_Handle send_port,
                                          Dart_Handle object) {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
   Instance& port_instance = Instance::Handle();
   port_instance ^= Api::UnwrapHandle(send_port);
   if (!DartLibraryCalls::IsSendPort(port_instance)) {
     return Api::NewError("send_port is not a SendPort.");
   }
   const Object& idObj = Object::Handle(
-  DartLibraryCalls::PortGetId(port_instance));
+      DartLibraryCalls::PortGetId(port_instance));
   ASSERT(!idObj.IsError());
   Integer& id = Integer::Handle();
   id ^= idObj.raw();
   Dart_Port port = static_cast<Dart_Port>(id.AsInt64Value());
-  if (Dart_Post(port, object)) {
+  uint8_t* data = NULL;
+  MessageWriter writer(&data, &allocator);
+  Object& msg_object = Object::Handle(Api::UnwrapHandle(object));
+  writer.WriteMessage(msg_object);
+  intptr_t len = writer.BytesWritten();
+  bool r = PortMap::PostMessage(
+      new Message(port, data, len, Message::kNormalPriority));
+  if (r) {
     return Api::Success();
   }
-  return Api::NewError("Dart_Post failed.");
+  return Api::NewError("Dart_PostMessage failed.");
 }
 
 // --- Scopes ----
 
 DART_EXPORT void Dart_EnterScope() {
   Isolate* isolate = Isolate::Current();
   CHECK_ISOLATE(isolate);
   ApiState* state = isolate->api_state();
   ASSERT(state != NULL);
   ApiLocalScope* new_scope = state->reusable_scope();
@@ skipping 3316 matching lines @@
 }
 
 
 // --- Service support ---
 
 DART_EXPORT Dart_Isolate Dart_GetServiceIsolate(void* callback_data) {
   return Api::CastIsolate(Service::GetServiceIsolate(callback_data));
 }
 
 }  // namespace dart