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diff --git a/chromium/mojo/spy/spy.h b/chromium/mojo/spy/spy.h
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+++ b/chromium/mojo/spy/spy.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 MOJO_SPY_SPY_H_
+#define MOJO_SPY_SPY_H_
+
+#include <string>
+#include "base/memory/scoped_ptr.h"
+
+namespace base {
+ class Thread;
+}
+
+namespace mojo {
+
+class ServiceManager;
+
+// mojo::Spy is a troubleshooting and debugging aid. It helps tracking
+// the mojo system core activities like messages, service creation, etc.
+//
+// The |options| parameter in the constructor comes from the command
+// line of the mojo_shell. Which takes --spy=<options>. Each option is
+// separated by ',' and each option is a key+ value pair separated by ':'.
+//
+// For example --spy=port:13333
+//
+class Spy {
+ public:
+  Spy(mojo::ServiceManager* service_manager, const std::string& options);
+  ~Spy();
+
+ private:
+   // This thread runs the code that talks to the frontend.
+   scoped_ptr<base::Thread> control_thread_;
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_SPY_SPY_H_