Add the ability to change the working directory

runtime/bin/directory_win.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 "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "bin/directory.h"
 #include "bin/file.h"
 
@@ skipping 407 matching lines @@
 char* Directory::Current() {
   int length = GetCurrentDirectoryW(0, NULL);
   wchar_t* current = new wchar_t[length + 1];
   GetCurrentDirectoryW(length + 1, current);
   char* result = StringUtils::WideToUtf8(current);
   delete[] current;
   return result;
 }
 
 
+bool Directory::SetCurrent(const char* path) {
+  const wchar_t* system_path = StringUtils::Utf8ToWide(path);
+  bool result = SetCurrentDirectoryW(system_path) != 0;
+  free(const_cast<wchar_t*>(system_path));
+  return result;
+}
+
+
 bool Directory::Create(const char* dir_name) {
   const wchar_t* system_name = StringUtils::Utf8ToWide(dir_name);
   int create_status = CreateDirectoryW(system_name, NULL);
   // If the directory already existed, treat it as a success.
   if (create_status == 0 &&
       GetLastError() == ERROR_ALREADY_EXISTS &&
       ExistsHelper(system_name) == EXISTS) {
     free(const_cast<wchar_t*>(system_name));
     return true;
   }
@@ skipping 88 matching lines @@
       MoveFileExW(system_path, system_new_path, flags);
   free(const_cast<wchar_t*>(system_path));
   free(const_cast<wchar_t*>(system_new_path));
   return (move_status != 0);
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)