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

remoting/protocol/input_stub.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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 a device that receives input events.
-// This interface handles event messages defined in event.proto.
+// This interface handles some event messages defined in event.proto.
 
 #ifndef REMOTING_PROTOCOL_INPUT_STUB_H_
 #define REMOTING_PROTOCOL_INPUT_STUB_H_
 
 #include "base/basictypes.h"
+#include "remoting/protocol/clipboard_stub.h"
 
 namespace remoting {
 namespace protocol {
 
 class KeyEvent;
 class MouseEvent;
 
-class InputStub {
+// TODO(wez): Stop InputStub inheriting from ClipboardStub when
+// DesktopEnvironment has been refactored so that it can treat InputStub and
+// ClipboardStub separately.
+class InputStub : public ClipboardStub {
  public:
   InputStub() {}
   virtual ~InputStub() {}
 
   virtual void InjectKeyEvent(const KeyEvent& event) = 0;
   virtual void InjectMouseEvent(const MouseEvent& event) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InputStub);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_INPUT_STUB_H_