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

remoting/protocol/input_stub.h

Index: remoting/protocol/input_stub.h
diff --git a/remoting/protocol/input_stub.h b/remoting/protocol/input_stub.h
index b7ec67e6c8542fbb1a445ff31f8dcb7b840a0556..036809c01edd30f85e788f18ae53ce6e0c393055 100644
--- a/remoting/protocol/input_stub.h
+++ b/remoting/protocol/input_stub.h
@@ -1,9 +1,9 @@
-// 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_