Add gnubby authentication to remoting host

remoting/host/gnubby_util.h

Index: remoting/host/gnubby_util.h
diff --git a/remoting/host/gnubby_util.h b/remoting/host/gnubby_util.h
new file mode 100644
index 0000000000000000000000000000000000000000..0d888d6ef6dead578e0fd855ade5139ad7e65eb3
--- /dev/null
+++ b/remoting/host/gnubby_util.h
@@ -0,0 +1,30 @@
+// 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_UTIL_H_
+#define REMOTING_HOST_GNUBBY_UTIL_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+
+namespace base {
+
+class DictionaryValue;
+
+}  // namespace base
+
+namespace remoting {
+
+// Get a gnubbyd sign request json string from a request blob.
+bool GetJsonFromGnubbyRequest(const char* data,
+                              int data_len,
+                              std::string* json);
+
+// Get response blob data from a gnubbyd sign reply json string.
+void GetGnubbyResponseFromJson(const std::string& json, std::string* data);
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_GNUBBY_UTIL_H_