Importing Google TV Pairing Protocol library

This has been modified to compile using nanobuf

Change-Id: If8f092b422d4be7b78ff0f6ef92c94beaea4300c
diff --git a/cpp/src/polo/pairing/message/secretackmessage.cc b/cpp/src/polo/pairing/message/secretackmessage.cc
new file mode 100644
index 0000000..a863efe
--- /dev/null
+++ b/cpp/src/polo/pairing/message/secretackmessage.cc
@@ -0,0 +1,43 @@
+// Copyright 2012 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "polo/pairing/message/secretackmessage.h"
+
+#include <sstream>
+#include "polo/util/poloutil.h"
+
+namespace polo {
+namespace pairing {
+namespace message {
+
+SecretAckMessage::SecretAckMessage(const std::vector<uint8_t>& secret)
+    : PoloMessage(PoloMessage::kSecretAck),
+      secret_(secret) {
+}
+
+const std::vector<uint8_t>& SecretAckMessage::secret() const {
+  return secret_;
+}
+
+std::string SecretAckMessage::ToString() const {
+  std::ostringstream ss;
+  ss << "[SecretAckMessage secret="
+      << util::PoloUtil::BytesToHexString(&secret_[0], secret_.size())
+      << "]";
+  return ss.str();
+}
+
+}  // namespace message
+}  // namespace pairing
+}  // namespace polo