Stub in more IPC attachment brokering functionality.

ipc/handle_attachment_win.cc

+// Copyright 2015 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.
+
+#include "ipc/handle_attachment_win.h"
+
+namespace IPC {
+namespace internal {
+
+HandleAttachmentWin::HandleAttachmentWin(const HANDLE& handle)
+    : handle_(handle) {
+}
+
+HandleAttachmentWin::~HandleAttachmentWin() {
+}
+
+HandleAttachmentWin::BrokerableType HandleAttachmentWin::GetBrokerableType()
+    const {
+  return WIN_HANDLE;
+}
+
+HandleAttachmentWin::WireFormat HandleAttachmentWin::GetWireFormat(
+    const base::ProcessId& destination) {
+  WireFormat format;
+  format.handle = handle_;
+  format.attachment_id = GetIdentifier();
+  format.destination_process = destination;
+  return format;
+}
+
+}  // namespace internal
+}  // namespace IPC