Compute absolute script path at isolate startup.

runtime/bin/main.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 <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
 #include "include/dart_api.h"
 #include "include/dart_debugger_api.h"
@@ skipping 590 matching lines @@
     result = Dart_RunLoop();
     CHECK_RESULT(result);
   }
 
   Platform::SetPackageRoot(package_root);
   Dart_Handle io_lib_url = DartUtils::NewString(DartUtils::kIOLibURL);
   CHECK_RESULT(io_lib_url);
   Dart_Handle io_lib = Dart_LookupLibrary(io_lib_url);
   CHECK_RESULT(io_lib);
   Dart_Handle platform_type = DartUtils::GetDartType(DartUtils::kIOLibURL,
-                                                     "Platform");
+                                                     "_Platform");
   CHECK_RESULT(platform_type);
   Dart_Handle script_name = DartUtils::NewString("_nativeScript");
   CHECK_RESULT(script_name);
   Dart_Handle dart_script = DartUtils::NewString(script_uri);
   CHECK_RESULT(dart_script);
   Dart_Handle set_script_name =
       Dart_SetField(platform_type, script_name, dart_script);
   CHECK_RESULT(set_script_name);
 
   // Make the isolate runnable so that it is ready to handle messages.
@@ skipping 557 matching lines @@
   exit(Process::GlobalExitCode());
 }
 
 }  // namespace bin
 }  // namespace dart
 
 int main(int argc, char** argv) {
   dart::bin::main(argc, argv);
   UNREACHABLE();
 }