Use unicode versions of process APIs on Windows. Additionally,

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 236 matching lines @@
   delete reinterpret_cast<File*>(stream);
 }
 
 
 // Convert all the arguments to UTF8. On Windows, the arguments are
 // encoded in the current code page and not UTF8.
 //
 // Returns true if the arguments are converted. In that case
 // each of the arguments need to be deallocated using free.
 static bool Utf8ConvertArgv(int argc, char** argv) {
-  bool result = false;
-  for (int i = 0; i < argc; i++) {
-    char* arg = argv[i];
-    argv[i] = StringUtils::ConsoleStringToUtf8(arg);
-    if (i == 0) {
-      result = argv[i] != arg;
-    } else {
-      ASSERT(result == (argv[i] != arg));
-    }
+  int unicode_argc = 0;
+  wchar_t** unicode_argv = ShellUtils::GetUnicodeArgv(&unicode_argc);
+  if (unicode_argv == NULL) return false;
+  for (int i = 0; i < unicode_argc; i++) {
+    wchar_t* arg = unicode_argv[i];
+    argv[i] = StringUtils::WideToUtf8(arg);
   }
-  return result;
+  ShellUtils::FreeUnicodeArgv(unicode_argv);
+  return true;
 }
 
 
 // Parse out the command line arguments. Returns -1 if the arguments
 // are incorrect, 0 otherwise.
 static int ParseArguments(int argc,
                           char** argv,
                           CommandLineOptions* vm_options,
                           char** executable_name,
                           char** script_name,
@@ skipping 511 matching lines @@
   Dart_ShutdownIsolate();
   // Terminate process exit-code handler.
   Process::TerminateExitCodeHandler();
   // Free copied argument strings if converted.
   if (argv_converted) {
     for (int i = 0; i < argc; i++) free(argv[i]);
   }
 
   return 0;
 }