IPC: Add new classes required for attachment brokering.

ipc/attachment_broker_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/attachment_broker_win.h"
+
+namespace IPC {
+
+AttachmentBrokerWin::AttachmentBrokerWin() {
+}
+
+AttachmentBrokerWin::~AttachmentBrokerWin() {
+}
+
+void AttachmentBrokerWin::OnReceiveDuplicatedHandle(
+    HANDLE,
+    BrokerableAttachment::AttachmentId id) {
+  // TODO(erikchen): Implement me. http://crbug.com/493414
+}
+
+void AttachmentBrokerWin::SendAttachmentToProcess(
+    BrokerableAttachment* attachment,
+    base::ProcessId destination_process) {
+  // TODO(erikchen): Implement me. http://crbug.com/493414
+}
+
+bool AttachmentBrokerWin::GetAttachmentWithId(
+    BrokerableAttachment::AttachmentId id,
+    BrokerableAttachment* attachment) {
+  // TODO(erikchen): Implement me. http://crbug.com/493414
+  return false;
+}
+
+}  // namespace IPC