Reduce service isolate startup time from ~80ms to ~30ms

runtime/bin/vmservice_impl.h

 // 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.
 
 #ifndef BIN_VMSERVICE_IMPL_H_
 #define BIN_VMSERVICE_IMPL_H_
 
 #include "bin/vmservice.h"
 
 #include "platform/globals.h"
@@ skipping 11 matching lines @@
  private:
   static bool _Start(const char *server_ip, intptr_t server_port);
   static Dart_Handle GetSource(const char* name);
   static Dart_Handle LoadScript(const char* name);
   static Dart_Handle LoadSource(Dart_Handle library, const char* name);
   static Dart_Handle LoadResources(Dart_Handle library);
   static Dart_Handle LoadResource(Dart_Handle library, const char* name,
                                   const char* prefix);
   static Dart_Handle LibraryTagHandler(Dart_LibraryTag tag, Dart_Handle library,
                                        Dart_Handle url);
+
+  friend void TriggerResourceLoad(Dart_NativeArguments args);
+
   static void ThreadMain(uword parameters);
   static const char* error_msg_;
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(VmService);
 };
 
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_VMSERVICE_IMPL_H_