Add gnubby authentication to remoting host

remoting/host/gnubby_auth_handler.h

Index: remoting/host/gnubby_auth_handler.h
diff --git a/remoting/host/gnubby_auth_handler.h b/remoting/host/gnubby_auth_handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..70d8baec23f21bafc8215eabf7c47e8427957004
--- /dev/null
+++ b/remoting/host/gnubby_auth_handler.h
@@ -0,0 +1,46 @@
+// 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 REMOTING_HOST_GNUBBY_AUTH_HANDLER_H_
+#define REMOTING_HOST_GNUBBY_AUTH_HANDLER_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace base {
+class FilePath;
+}  // namespace base
+
+namespace remoting {
+
+namespace protocol {
+class ClientStub;
+}  // namespace protocol
+
+// Class responsible for proxying authentication data between a local gnubbyd
+// and the client.
+class GnubbyAuthHandler {
+ public:
+  virtual ~GnubbyAuthHandler() {}
+
+  // Creates a platform-specific GnubbyAuthHandler.
+  static scoped_ptr<GnubbyAuthHandler> Create(
+      protocol::ClientStub* client_stub);
+
+  // Specify the name of the socket to listen to gnubby requests on.
+  static void SetGnubbySocketName(const base::FilePath& gnubby_socket_name);
+
+  // A message was received from the client.
+  virtual void DeliverClientMessage(const std::string& message) = 0;
+
+  // Send data to client.
+  virtual void DeliverHostDataMessage(int connection_id,
+                                      const std::string& data) const = 0;
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_GNUBBY_AUTH_HANDLER_H_