Use unicode versions of process APIs on Windows. Additionally,

runtime/bin/utils_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 <errno.h>
 
 #include "bin/utils.h"
 #include "bin/log.h"
 
 static void FormatMessageIntoBuffer(DWORD code,
@@ skipping 86 matching lines @@
   return const_cast<const char*>(ConsoleStringToUtf8(const_cast<char*>(str)));
 }
 
 const char* StringUtils::WideToUtf8(const wchar_t* wide) {
   return const_cast<const char*>(WideToUtf8(const_cast<wchar_t*>(wide)));
 }
 
 const wchar_t* StringUtils::Utf8ToWide(const char* utf8) {
   return const_cast<const wchar_t*>(Utf8ToWide(const_cast<char*>(utf8)));
 }
+
+wchar_t** ShellUtils::GetUnicodeArgv(int* argc) {
+  wchar_t* command_line = GetCommandLineW();
+  return CommandLineToArgvW(command_line, argc);
+}
+
+void ShellUtils::FreeUnicodeArgv(wchar_t** argv) {
+  LocalFree(argv);
+}