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

remoting/protocol/clipboard_stub.h

Index: remoting/protocol/clipboard_stub.h
diff --git a/remoting/protocol/clipboard_stub.h b/remoting/protocol/clipboard_stub.h
new file mode 100644
index 0000000000000000000000000000000000000000..2cc505118165a2f5c787ab9097ed3ec243337b1d
--- /dev/null
+++ b/remoting/protocol/clipboard_stub.h
@@ -0,0 +1,32 @@
+// 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 receives clipboard events.
+// This interface handles some event messages defined in event.proto.
+
+#ifndef REMOTING_PROTOCOL_CLIPBOARD_STUB_H_
+#define REMOTING_PROTOCOL_CLIPBOARD_STUB_H_
+
+#include "base/basictypes.h"
+
+namespace remoting {
+namespace protocol {
+
+class ClipboardEvent;
+
+class ClipboardStub {
+ public:
+  ClipboardStub() {}
+  virtual ~ClipboardStub() {}
+
+  virtual void InjectClipboardEvent(const ClipboardEvent& event) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ClipboardStub);
+};
+
+}  // namespace protocol
+}  // namespace remoting
+
+#endif  // REMOTING_PROTOCOL_CLIPBOARD_STUB_H_