Add optional workingDirectory argument to Process.start.

runtime/bin/process_win.cc

 // Copyright (c) 2011, 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 <process.h>
 
 #include "bin/builtin.h"
 #include "bin/globals.h"
 #include "bin/process.h"
 #include "bin/eventhandler.h"
@@ skipping 211 matching lines @@
   if (!ok || written != sizeof(message)) {
     fprintf(stderr, "WriteFile failed %d\n", GetLastError());
   }
   return 0;
 }
 
 
 int Process::Start(const char* path,
                    char* arguments[],
                    intptr_t arguments_length,
+                   const char* working_directory,
                    intptr_t* in,
                    intptr_t* out,
                    intptr_t* err,
                    intptr_t* id,
                    intptr_t* exit_handler,
                    char* os_error_message,
                    int os_error_message_len) {
   HANDLE stdin_handles[2] = { INVALID_HANDLE_VALUE, INVALID_HANDLE_VALUE };
   HANDLE stdout_handles[2] = { INVALID_HANDLE_VALUE, INVALID_HANDLE_VALUE };
   HANDLE stderr_handles[2] = { INVALID_HANDLE_VALUE, INVALID_HANDLE_VALUE };
@@ skipping 97 matching lines @@
   }
 
   // Create process.
   BOOL result = CreateProcess(NULL,   // ApplicationName
                               command_line,
                               NULL,   // ProcessAttributes
                               NULL,   // ThreadAttributes
                               TRUE,   // InheritHandles
                               0,      // CreationFlags
                               NULL,   // Environment
-                              NULL,   // CurrentDirectory,
+                              working_directory,
                               &startup_info,
                               &process_info);
 
   // Deallocate command-line string.
   delete[] command_line;
 
   if (result == 0) {
     int error_code = SetOsErrorMessage(os_error_message, os_error_message_len);
     CloseProcessPipes(
         stdin_handles, stdout_handles, stderr_handles, exit_handles);
@@ skipping 44 matching lines @@
       return false;
     }
   }
   return true;
 }
 
 
 void Process::Exit(intptr_t id) {
   RemoveProcess(id);
 }