Convert utility process zip creator IPC to mojo

chrome/common/zip_file_creator.mojom

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Zip file creator provided by the utility process and exposed by mojo
+// policy control to the chrome browser process on OS_CHROMEOS.
+
+module chrome.mojom;
+
+import "mojo/common/file.mojom";
+import "mojo/common/file_path.mojom";
+
+interface ZipFileCreator {
+  // OS_CHROMEOS: Create a |zip_file| from a list of source files.
+  CreateZipFile(mojo.common.mojom.FilePath source_dir,
+                array<mojo.common.mojom.FilePath> source_relative_paths,
+                mojo.common.mojom.File zip_file)
+      => (bool success);
+};