Add support for directory renaming to dart:io.

runtime/bin/directory.h

 // 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.
 
 #ifndef BIN_DIRECTORY_H_
 #define BIN_DIRECTORY_H_
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
 #include "platform/globals.h"
@@ skipping 23 matching lines @@
 
 
 class Directory {
  public:
   enum ExistsResult {
     UNKNOWN,
     EXISTS,
     DOES_NOT_EXIST
   };
 
+  // This enum must be kept in sync with the request values in
+  // directory_impl.dart.
   enum DirectoryRequest {
     kCreateRequest = 0,
     kDeleteRequest = 1,
     kExistsRequest = 2,
     kCreateTempRequest = 3,
-    kListRequest = 4
+    kListRequest = 4,
+    kRenameRequest = 5
   };
 
   static bool List(const char* path,
                    bool recursive,
                    DirectoryListing* listing);
-
   static ExistsResult Exists(const char* path);
-
   static char* Current();
-
   static bool Create(const char* path);
-
   static char* CreateTemp(const char* const_template);
-
   static bool Delete(const char* path, bool recursive);
-
+  static bool Rename(const char* path, const char* new_path);
   static Dart_Port GetServicePort();
 
  private:
   static dart::Mutex mutex_;
   static int service_ports_size_;
   static Dart_Port* service_ports_;
   static int service_ports_index_;
 
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(Directory);
 };
 
 
 #endif  // BIN_DIRECTORY_H_