Convert utility process extension Unpacker IPC to mojo

extensions/common/extension_unpacker.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 unpacker service provided by the utility process
+// and exposed by mojo policy to the chrome browser process.
+
+module extensions.mojom;
+
+import "extensions/common/manifest_location.mojom";
+import "mojo/common/file_path.mojom";
+import "mojo/common/string16.mojom";
+import "mojo/common/values.mojom";
+
+interface ExtensionUnpacker {
+  // Unzip |file| into the directory |path|.
+  Unzip(mojo.common.mojom.FilePath file,
+        mojo.common.mojom.FilePath path) => (bool success);
+
+  // Unpack, validate, and sanitize the extension in directory |path|, and
+  // return the parsed manifest.json in |manifest|. The supplied |location|
+  // and |creation_flags| are passed to Extensions:Create().
+  // If unpacking fails, |error| is a user-displayable explanation of what
+  // went wrong.
+  Unpack(mojo.common.mojom.FilePath path,
+         string extension_id,
+         ManifestLocation location,
+         int32 creation_flags)
+      => (mojo.common.mojom.String16 error,
+          mojo.common.mojom.DictionaryValue? manifest);
+};