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

runtime/bin/eventhandler.cc

Index: runtime/bin/eventhandler.cc
diff --git a/runtime/bin/eventhandler.cc b/runtime/bin/eventhandler.cc
index 0c5b76577675066ba92158d957cbd2a1fd11a993..90eddd09ef2d59b4fa456428c8383887320c9fa9 100644
--- a/runtime/bin/eventhandler.cc
+++ b/runtime/bin/eventhandler.cc
@@ -106,12 +106,7 @@ void FUNCTION_NAME(EventHandler_SendData)(Dart_NativeArguments args) {
     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