Convert utility process extension ParseUpdate IPC to mojo

extensions/common/manifest_parser.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.
+
+// Secure chrome extension update manifest parser provided by the utility
+// process and exposed by mojo policy to the chrome browser process.
+
+module extensions.mojom;
+
+import "url/mojo/url.mojom";
+
+interface ManifestParser {
+  // Parse an extensions update manifest |xml| document and return the
+  // |results|, or null if parsing fails.
+  Parse(string xml) => (UpdateManifestResults? results);
+};
+
+struct UpdateManifestResults {
+  array<UpdateManifestResult> list;
+  int32 daystart_elapsed_seconds;
+};
+
+struct UpdateManifestResult {
+  string extension_id;
+  string version;
+  string browser_min_version;
+
+  url.mojom.Url crx_url;
+  string package_hash;
+  int32 size;
+  string package_fingerprint;
+
+  url.mojom.Url diff_crx_url;
+  string diff_package_hash;
+  int32 diff_size;
+};