Short-cut the call to Timer.run, to not go through standalone.

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 "bin/thread.h"
 
 #include "include/dart_api.h"
@@ skipping 88 matching lines @@
     Dart_PropagateError(handle);
     UNREACHABLE();
   }
   Dart_Port dart_port;
   handle = Dart_IntegerToInt64(handle, &dart_port);
   if (Dart_IsError(handle)) {
     Dart_PropagateError(handle);
     UNREACHABLE();
   }
   int64_t data = DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 2));
-  if ((id == kTimerId) && (data == 0)) {
-    // This is a 0-timer. Simply queue a 'null' on the port.
-    DartUtils::PostNull(dart_port);
-  } else {
-    event_handler->SendData(id, dart_port, data);
-  }
+  event_handler->SendData(id, dart_port, data);
 }
 
 }  // namespace bin
 }  // namespace dart