Change temp dir generation on Windows to use UUIDs instead of random numbers

runtime/bin/directory.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 "bin/dartutils.h"
 #include "bin/directory.h"
 
 #include "include/dart_api.h"
 
 static intptr_t GetHandlerPort(Dart_Handle handle) {
@@ skipping 61 matching lines @@
   } else {
     Dart_SetReturnValue(args, Dart_NewBoolean(false));
   }
   Dart_ExitScope();
 }
 
 
 void FUNCTION_NAME(Directory_CreateTemp)(Dart_NativeArguments args) {
   Dart_EnterScope();
   Dart_Handle path = Dart_GetNativeArgument(args, 0);
-  Dart_Handle number = Dart_GetNativeArgument(args, 1);
-  Dart_Handle status_handle = Dart_GetNativeArgument(args, 2);
+  Dart_Handle status_handle = Dart_GetNativeArgument(args, 1);
   static const int kMaxChildOsErrorMessageLength = 256;
   char os_error_message[kMaxChildOsErrorMessageLength];
-  if (!Dart_IsString(path) || !Dart_IsInteger(number)) {
+  if (!Dart_IsString(path)) {
     DartUtils::SetIntegerInstanceField(status_handle, "_errorCode", 0);
     DartUtils::SetStringInstanceField(
         status_handle, "_errorMessage", "Invalid arguments");
     Dart_SetReturnValue(args, Dart_Null());
     Dart_ExitScope();
     return;
   }
 
   char* result = NULL;
   int error_code = Directory::CreateTemp(DartUtils::GetStringValue(path),
-                                         DartUtils::GetIntegerValue(number),
                                          &result,
                                          os_error_message,
                                          kMaxChildOsErrorMessageLength);
   if (error_code == 0) {
     Dart_SetReturnValue(args, Dart_NewString(result));
     free(result);
   } else {
     ASSERT(result == NULL);
     if (error_code == -1) {
       DartUtils::SetIntegerInstanceField(status_handle, "_errorCode", 0);
@@ skipping 15 matching lines @@
   Dart_EnterScope();
   Dart_Handle path = Dart_GetNativeArgument(args, 1);
   if (Dart_IsString(path)) {
     bool deleted = Directory::Delete(DartUtils::GetStringValue(path));
     Dart_SetReturnValue(args, Dart_NewBoolean(deleted));
   } else {
     Dart_SetReturnValue(args, Dart_NewBoolean(false));
   }
   Dart_ExitScope();
 }