Make implicit things explicit when loading scripts.

runtime/bin/dartutils.h

 // 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.
 
 #ifndef BIN_DARTUTILS_H_
 #define BIN_DARTUTILS_H_
 
 #include "include/dart_api.h"
 
 #include "platform/assert.h"
@@ skipping 144 matching lines @@
   }
 
   // Create a new Dart InternalError object with the provided message.
   static Dart_Handle NewInternalError(const char* message);
 
   static void SetOriginalWorkingDirectory();
 
   static const char* MapLibraryUrl(CommandLineOptions* url_mapping,
                                    const char* url_string);
 
+  static Dart_Handle SetWorkingDirectory(Dart_Handle builtin_lib);
+
   static Dart_Handle ResolveScriptUri(Dart_Handle script_uri,
                                       Dart_Handle builtin_lib);
 
   static Dart_Handle FilePathFromUri(Dart_Handle script_uri,
                                      Dart_Handle builtin_lib);
 
   static Dart_Handle ResolveUri(Dart_Handle library_url,
                                 Dart_Handle url,
                                 Dart_Handle builtin_lib);
 
@@ skipping 332 matching lines @@
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CObjectExternalUint8Array);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_DARTUTILS_H_