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diff --git a/ipc/ipc_security_test_util.h b/ipc/ipc_security_test_util.h
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+// 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.
+
+#ifndef IPC_IPC_SECURITY_TEST_UTIL_H_
+#define IPC_IPC_SECURITY_TEST_UTIL_H_
+
+#include "base/basictypes.h"
+
+namespace IPC {
+
+class ChannelProxy;
+class Message;
+
+class IpcSecurityTestUtil {
+ public:
+  // Enables testing of security exploit scenarios where a compromised child
+  // process can send a malicious message of an arbitrary type.
+  //
+  // This function will post the message to the IPC channel's thread, where it
+  // is offered to the channel's listeners. Afterwards, a reply task is posted
+  // back to the current thread. This function blocks until the reply task is
+  // received. For messages forwarded back to the current thread, we won't
+  // return until after the message has been handled here.
+  //
+  // Use this only for testing security bugs in a browsertest; other uses are
+  // likely perilous. Unit tests should be using IPC::TestSink which has an
+  // OnMessageReceived method you can call directly. Non-security browsertests
+  // should just exercise the child process's normal codepaths to send messages.
+  static void PwnMessageReceived(ChannelProxy* channel, const Message& message);
+
+ private:
+  IpcSecurityTestUtil();  // Not instantiable.
+
+  DISALLOW_COPY_AND_ASSIGN(IpcSecurityTestUtil);
+};
+
+}  // namespace IPC
+
+#endif  // IPC_IPC_SECURITY_TEST_UTIL_H_