Do not start the service isolate when generating the core library snapshot as it does not load any …

runtime/bin/gen_snapshot.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.
 
 // Generate a snapshot file after loading all the scripts specified on the
 // command line.
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
@@ skipping 1013 matching lines @@
 #if TARGET_ARCH_ARM
     // This is for the iPod Touch 5th Generation (and maybe other older devices)
     vm_options.AddArgument("--no-use_integer_division");
 #endif
   }
 
   Dart_SetVMFlags(vm_options.count(), vm_options.arguments());
 
   // Initialize the Dart VM.
   // Note: We don't expect isolates to be created from dart code during
-  // snapshot generation.
+  // core library snapshot generation. However for the case when a full
+  // snasphot is generated from a script (app_script_name != NULL) we will
+  // need the service isolate to resolve URI and load code.
   char* error = Dart_Initialize(
       NULL,
       NULL,
       NULL,
-      CreateServiceIsolate,
+      (app_script_name != NULL) ? CreateServiceIsolate : NULL,
       NULL,
       NULL,
       NULL,
       DartUtils::OpenFile,
       DartUtils::ReadFile,
       DartUtils::WriteFile,
       DartUtils::CloseFile,
       DartUtils::EntropySource,
       NULL);
   if (error != NULL) {
@@ skipping 100 matching lines @@
   EventHandler::Stop();
   return 0;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 int main(int argc, char** argv) {
   return dart::bin::main(argc, argv);
 }