diff -r 000000000000 -r 6474c204b198 ipc/chromium/src/chrome/common/message_router.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/chromium/src/chrome/common/message_router.cc	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,42 @@
+// Copyright (c) 2006-2008 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 "chrome/common/message_router.h"
+
+void MessageRouter::OnControlMessageReceived(const IPC::Message& msg) {
+  NOTREACHED() <<
+      "should override in subclass if you care about control messages";
+}
+
+bool MessageRouter::Send(IPC::Message* msg) {
+  NOTREACHED() <<
+      "should override in subclass if you care about sending messages";
+  return false;
+}
+
+void MessageRouter::AddRoute(int32_t routing_id,
+                             IPC::Channel::Listener* listener) {
+  routes_.AddWithID(listener, routing_id);
+}
+
+void MessageRouter::RemoveRoute(int32_t routing_id) {
+  routes_.Remove(routing_id);
+}
+
+void MessageRouter::OnMessageReceived(const IPC::Message& msg) {
+  if (msg.routing_id() == MSG_ROUTING_CONTROL) {
+    OnControlMessageReceived(msg);
+  } else {
+    RouteMessage(msg);
+  }
+}
+
+bool MessageRouter::RouteMessage(const IPC::Message& msg) {
+  IPC::Channel::Listener* listener = routes_.Lookup(msg.routing_id());
+  if (!listener)
+    return false;
+
+  listener->OnMessageReceived(msg);
+  return true;
+}