dart:io | Add Directory.CreateSystemTemp(template) and change Directory.CreateTemp(template).

sdk/lib/io/io_service.dart

Index: sdk/lib/io/io_service.dart
diff --git a/sdk/lib/io/io_service.dart b/sdk/lib/io/io_service.dart
index 760d022481380f63e8cdfe6399f39af78ad6fb12..037cdd1cfbc85a413ed10a1706ca0d3cd88413ea 100644
--- a/sdk/lib/io/io_service.dart
+++ b/sdk/lib/io/io_service.dart
@@ -4,6 +4,7 @@
 
 part of dart.io;
 
+// This list must be kept in sync with the list in runtime/bin/io_service.h
 const int _FILE_EXISTS = 0;
 const int _FILE_CREATE = 1;
 const int _FILE_DELETE = 2;
@@ -37,11 +38,12 @@ const int _DIRECTORY_CREATE = 29;
 const int _DIRECTORY_DELETE = 30;
 const int _DIRECTORY_EXISTS = 31;
 const int _DIRECTORY_CREATE_TEMP = 32;
-const int _DIRECTORY_LIST_START = 33;
-const int _DIRECTORY_LIST_NEXT = 34;
-const int _DIRECTORY_LIST_STOP = 35;
-const int _DIRECTORY_RENAME = 36;
-const int _SSL_PROCESS_FILTER = 37;
+const int _DIRECTORY_CREATE_SYSTEM_TEMP = 33;
+const int _DIRECTORY_LIST_START = 34;
+const int _DIRECTORY_LIST_NEXT = 35;
+const int _DIRECTORY_LIST_STOP = 36;
+const int _DIRECTORY_RENAME = 37;
+const int _SSL_PROCESS_FILTER = 38;
 
 class _IOService {
   external static Future dispatch(int request, List data);