Use native wrapper fields to store socket ids.

runtime/bin/eventhandler.cc

 // 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.
 
 #include "bin/dartutils.h"
 #include "bin/eventhandler.h"
+#include "bin/socket.h"
 
 #include "include/dart_api.h"
 
 
-static const intptr_t kNativeEventHandlerFieldIndex = 0;
+static const int kNativeEventHandlerFieldIndex = 0;
+static const intptr_t kTimerId = -1;
+static const intptr_t kInvalidId = -2;
 
 /*
  * Returns the reference of the EventHandler stored in the native field.
  */
 static EventHandler* GetEventHandler(Dart_Handle handle) {
   intptr_t value = 0;
   Dart_Handle result = Dart_GetNativeInstanceField(
       handle, kNativeEventHandlerFieldIndex, &value);
   if (Dart_IsError(result)) {
     Dart_PropagateError(result);
@@ skipping 30 matching lines @@
 
 /*
  * Send data to the EventHandler thread to register for a given instance
  * args[1] a ReceivePort args[2] with a notification event args[3]. args[0]
  * holds the reference to the dart EventHandler object.
  */
 void FUNCTION_NAME(EventHandler_SendData)(Dart_NativeArguments args) {
   Dart_EnterScope();
   Dart_Handle handle = Dart_GetNativeArgument(args, 0);
   EventHandler* event_handler = GetEventHandler(handle);
-  intptr_t id = DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 1));
+  Dart_Handle sender = Dart_GetNativeArgument(args, 1);
+  intptr_t id = kInvalidId;
+  if (Dart_IsNull(sender)) {
+    id = kTimerId;
+  } else {
+    Socket::GetSocketIdNativeField(sender, &id);
+  }
   handle = Dart_GetNativeArgument(args, 2);
   Dart_Port dart_port =
       DartUtils::GetIntegerField(handle, DartUtils::kIdFieldName);
   intptr_t data = DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 3));
   event_handler->SendData(id, dart_port, data);
   Dart_ExitScope();
 }