reorg: move JS ops implementations to cli/js/ops/, part 3 (#4302)

Following JS ops were moved to separate files in cli/js/ops directory:
- net
- tls
- fs

cli/js/ops/fs/chown.ts

@@ -0,0 +1,32 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+import { sendSync, sendAsync } from "../dispatch_json.ts";
+
+/** Synchronously change owner of a regular file or directory. Linux/Mac OS
+ * only at the moment.
+ *
+ * Requires `allow-write` permission.
+ *
+ * @param path path to the file
+ * @param uid user id of the new owner
+ * @param gid group id of the new owner
+ */
+export function chownSync(path: string, uid: number, gid: number): void {
+  sendSync("op_chown", { path, uid, gid });
+}
+
+/** Change owner of a regular file or directory. Linux/Mac OS only at the
+ * moment.
+ *
+ * Requires `allow-write` permission.
+ *
+ * @param path path to the file
+ * @param uid user id of the new owner
+ * @param gid group id of the new owner
+ */
+export async function chown(
+  path: string,
+  uid: number,
+  gid: number
+): Promise<void> {
+  await sendAsync("op_chown", { path, uid, gid });
+}