Adds a special case for sending an int over a port with the native API.

runtime/vm/json_stream.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 "platform/assert.h"
 
 #include "vm/dart_entry.h"
 #include "vm/debugger.h"
 #include "vm/json_stream.h"
 #include "vm/message.h"
@@ skipping 143 matching lines @@
 }
 
 
 static uint8_t* allocator(uint8_t* ptr, intptr_t old_size, intptr_t new_size) {
   void* new_ptr = realloc(reinterpret_cast<void*>(ptr), new_size);
   return reinterpret_cast<uint8_t*>(new_ptr);
 }
 
 
 void JSONStream::PostNullReply(Dart_Port port) {
-  const Object& reply = Object::Handle(Object::null());
-  ASSERT(reply.IsNull());
-
-  uint8_t* data = NULL;
-  MessageWriter writer(&data, &allocator, false);
-  writer.WriteMessage(reply);
-  PortMap::PostMessage(new Message(port,
-                                   data,
-                                   writer.BytesWritten(),
-                                   Message::kNormalPriority));
+  PortMap::PostMessage(new Message(
+      port, Object::null(), Message::kNormalPriority));
 }
 
 
 void JSONStream::PostReply() {
   Dart_Port port = reply_port();
   ASSERT(port != ILLEGAL_PORT);
   set_reply_port(ILLEGAL_PORT);  // Prevent double replies.
   int64_t process_delta_micros = 0;
   if (FLAG_trace_service) {
     process_delta_micros = OS::GetCurrentTimeMicros() - setup_time_micros_;
@@ skipping 652 matching lines @@
   intptr_t len2 = OS::VSNPrint(p, len+1, format, args);
   va_end(args);
   ASSERT(len == len2);
   stream_->buffer_.AddChar('"');
   stream_->AddEscapedUTF8String(p);
   stream_->buffer_.AddChar('"');
   free(p);
 }
 
 }  // namespace dart