Wrap all arguments passed to processes in "" on Windows.

runtime/bin/process_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 <process.h>
 
 #include "bin/builtin.h"
 #include "bin/process.h"
 #include "bin/eventhandler.h"
 #include "bin/thread.h"
@@ skipping 542 matching lines @@
   startup_info.dwFlags |= STARTF_USESTDHANDLES;
 
   PROCESS_INFORMATION process_info;
   ZeroMemory(&process_info, sizeof(process_info));
 
   // Compute command-line length.
   int command_line_length = strlen(path);
   for (int i = 0; i < arguments_length; i++) {
     command_line_length += strlen(arguments[i]);
   }
-  // Account for two occurrences of '"' around the command, one
-  // space per argument and a terminating '\0'.
-  command_line_length += 2 + arguments_length + 1;
+  // Account for two occurrences of '"' around the command, one space
+  // and two occurrences of '"' per argument and a terminating '\0'.
+  command_line_length += 2 + (3 * arguments_length) + 1;
   static const int kMaxCommandLineLength = 32768;
   if (command_line_length > kMaxCommandLineLength) {
     int error_code = SetOsErrorMessage(os_error_message, os_error_message_len);
     CloseProcessPipes(
         stdin_handles, stdout_handles, stderr_handles, exit_handles);
     return error_code;
   }
 
   // Put together command-line string.
   char* command_line = new char[command_line_length];
   int len = 0;
   int remaining = command_line_length;
   int written = snprintf(command_line + len, remaining, "\"%s\"", path);
   len += written;
   remaining -= written;
   ASSERT(remaining >= 0);
   for (int i = 0; i < arguments_length; i++) {
-    written = snprintf(command_line + len, remaining, " %s", arguments[i]);
+    written = snprintf(command_line + len, remaining, " \"%s\"", arguments[i]);
     len += written;
     remaining -= written;
     ASSERT(remaining >= 0);
   }
 
   // Create process.
   BOOL result = CreateProcess(NULL,   // ApplicationName
                               command_line,
                               NULL,   // ProcessAttributes
                               NULL,   // ThreadAttributes
@@ skipping 49 matching lines @@
   if (!result) {
     return false;
   }
   return true;
 }
 
 
 void Process::TerminateExitCodeHandler() {
   ExitCodeHandler::TerminateExitCodeThread();
 }