[dart:io] Namespaces for file IO

runtime/bin/directory_patch.dart

Index: runtime/bin/directory_patch.dart
diff --git a/runtime/bin/directory_patch.dart b/runtime/bin/directory_patch.dart
index 5e4d24c57a85f927b621de1876d7ca8977d24052..dbb6bd924d36d9acab33173f2c82a1cc20f72fdf 100644
--- a/runtime/bin/directory_patch.dart
+++ b/runtime/bin/directory_patch.dart
@@ -5,23 +5,27 @@
 @patch
 class _Directory {
   @patch
-  static _current() native "Directory_Current";
+  static _current(_Namespace namespace) native "Directory_Current";
   @patch
-  static _setCurrent(path) native "Directory_SetCurrent";
+  static _setCurrent(_Namespace namespace, path) native "Directory_SetCurrent";
   @patch
-  static _createTemp(String path) native "Directory_CreateTemp";
+  static _createTemp(_Namespace namespace, String path)
+      native "Directory_CreateTemp";
   @patch
-  static String _systemTemp() native "Directory_SystemTemp";
+  static String _systemTemp(_Namespace namespace) native "Directory_SystemTemp";
   @patch
-  static _exists(String path) native "Directory_Exists";
+  static _exists(_Namespace namespace, String path) native "Directory_Exists";
   @patch
-  static _create(String path) native "Directory_Create";
+  static _create(_Namespace namespace, String path) native "Directory_Create";
   @patch
-  static _deleteNative(String path, bool recursive) native "Directory_Delete";
+  static _deleteNative(_Namespace namespace, String path, bool recursive)
+      native "Directory_Delete";
   @patch
-  static _rename(String path, String newPath) native "Directory_Rename";
+  static _rename(_Namespace namespace, String path, String newPath)
+      native "Directory_Rename";
   @patch
   static void _fillWithDirectoryListing(
+      _Namespace namespace,
       List<FileSystemEntity> list,
       String path,
       bool recursive,
@@ -50,7 +54,7 @@ class _AsyncDirectoryListerOpsImpl extends NativeFieldWrapperClass1
 // Corelib 'Uri.base' implementation.
 // Uri.base is susceptible to changes in the current working directory.
 Uri _uriBaseClosure() {
-  var result = _Directory._current();
+  var result = _Directory._current(_Namespace._namespace);
   if (result is OSError) {
     throw new FileSystemException(
         "Getting current working directory failed", "", result);