Add the plumbing that will carry a clipboard item from a chromoting client to a host.

remoting/protocol/host_event_stub.h

Index: remoting/protocol/host_event_stub.h
diff --git a/remoting/protocol/host_event_stub.h b/remoting/protocol/host_event_stub.h
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+++ b/remoting/protocol/host_event_stub.h
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+// Copyright (c) 2012 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.
+
+// Interface for an object that handles input and clipboard events.
+
+#ifndef REMOTING_PROTOCOL_HOST_EVENT_STUB_H_
+#define REMOTING_PROTOCOL_HOST_EVENT_STUB_H_
+
+#include "base/basictypes.h"
+#include "remoting/protocol/clipboard_stub.h"
+#include "remoting/protocol/input_stub.h"
+
+namespace remoting {
+namespace protocol {
+
+class HostEventStub : public ClipboardStub, public InputStub {
+ public:
+  HostEventStub() {}
+  virtual ~HostEventStub() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(HostEventStub);
+};
+
+}  // namespace protocol
+}  // namespace remoting
+
+#endif  // REMOTING_PROTOCOL_HOST_EVENT_STUB_H_