Fix for issue 29819

runtime/bin/loader.cc

 // Copyright (c) 2016, 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/loader.h"
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
 #include "bin/dfe.h"
 #include "bin/extensions.h"
@@ skipping 617 matching lines @@
       return library_url;
     }
     return Dart_DefaultCanonicalizeUrl(library_url, url);
   }
   const char* url_string = NULL;
   Dart_Handle result = Dart_StringToCString(url, &url_string);
   if (Dart_IsError(result)) {
     return result;
   }
   if (tag == Dart_kScriptTag) {
-    if (dfe.UseDartFrontend()) {
+    if (dfe.UseDartFrontend() || dfe.kernel_file_specified()) {
       Dart_Isolate current = Dart_CurrentIsolate();
       // Check if we are trying to reload a kernel file or if the '--dfe'
       // option was specified and we need to compile sources using DFE.
       if (!Dart_IsServiceIsolate(current) && !Dart_IsKernelIsolate(current)) {
         // When using DFE the library tag handler should be called only when
         // we are reloading scripts.
         return dfe.ReloadScript(current, url_string);
       }
     }
     // TODO(asiva) We need to ensure that the kernel and service isolates
@@ skipping 246 matching lines @@
   MutexLocker ml(loader_infos_lock_);
   Loader* loader = LoaderForLocked(dest_port_id);
   if (loader == NULL) {
     return;
   }
   loader->QueueMessage(message);
 }
 
 }  // namespace bin
 }  // namespace dart