dart:io | Add rename to Link

runtime/bin/file_win.cc

Index: runtime/bin/file_win.cc
diff --git a/runtime/bin/file_win.cc b/runtime/bin/file_win.cc
index 723bd6ce20696917031dacb908d9d600a7667166..08417ea9ac03220bc7d83a648c42ef3a9b7f8260 100644
--- a/runtime/bin/file_win.cc
+++ b/runtime/bin/file_win.cc
@@ -297,8 +297,24 @@ bool File::Rename(const char* old_path, const char* new_path) {
     free(const_cast<wchar_t*>(system_old_path));
     free(const_cast<wchar_t*>(system_new_path));
     return (move_status != 0);
-  } else if (type == kIsDirectory) {
+  } else {
     SetLastError(ERROR_FILE_NOT_FOUND);
+  }
+  return false;
+}
+
+
+bool File::RenameLink(const char* old_path, const char* new_path) {
+  File::Type type = GetType(old_path, false);
+  if (type == kIsLink) {
+    const wchar_t* system_old_path = StringUtils::Utf8ToWide(old_path);
+    const wchar_t* system_new_path = StringUtils::Utf8ToWide(new_path);
+    DWORD flags = MOVEFILE_WRITE_THROUGH;
+    int move_status =
+        MoveFileExW(system_old_path, system_new_path, flags);
+    free(const_cast<wchar_t*>(system_old_path));
+    free(const_cast<wchar_t*>(system_new_path));
+    return (move_status != 0);
   } else {
     SetLastError(ERROR_FILE_NOT_FOUND);
   }