Add RoutingIDIssuer to help track routing id issues.

content/public/test/routing_id_mangling_disabler.cc

Index: content/public/test/routing_id_mangling_disabler.cc
diff --git a/content/public/test/routing_id_mangling_disabler.cc b/content/public/test/routing_id_mangling_disabler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b1e83a127a15fdf73ab8ea423423bb68767afef7
--- /dev/null
+++ b/content/public/test/routing_id_mangling_disabler.cc
@@ -0,0 +1,19 @@
+// Copyright 2014 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 "content/public/test/routing_id_mangling_disabler.h"
+
+#include "content/browser/renderer_host/routing_id_issuer.h"
+
+namespace content {
+
+RoutingIDManglingDisabler::RoutingIDManglingDisabler() {
+  RoutingIDIssuer::DisableIDMangling();
+}
+
+RoutingIDManglingDisabler::~RoutingIDManglingDisabler() {
+  RoutingIDIssuer::EnableIDMangling();
+}
+
+}  // namespace content