Add packet logger and server

webrtc/tools/network_tester/packet_logger.h

Index: webrtc/tools/network_tester/packet_logger.h
diff --git a/webrtc/tools/network_tester/packet_logger.h b/webrtc/tools/network_tester/packet_logger.h
new file mode 100644
index 0000000000000000000000000000000000000000..35d67219039f9fe4a3f5eff7e432d6da97ff6f08
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+++ b/webrtc/tools/network_tester/packet_logger.h
@@ -0,0 +1,46 @@
+/*
+ *  Copyright 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_TOOLS_NETWORK_TESTER_PACKET_LOGGER_H_
+#define WEBRTC_TOOLS_NETWORK_TESTER_PACKET_LOGGER_H_
+
+#include <fstream>
+#include <string>
+
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/base/ignore_wundef.h"
+
+#ifdef WEBRTC_NETWORK_TESTER_PROTO
+RTC_PUSH_IGNORING_WUNDEF()
+#include "webrtc/tools/network_tester/network_tester_packet.pb.h"
+RTC_POP_IGNORING_WUNDEF()
+using webrtc::network_tester::packet::NetworkTesterPacket;
+#else
+class NetworkTesterPacket;
+#endif  // WEBRTC_NETWORK_TESTER_PROTO
+
+namespace webrtc {
+
+class PacketLogger {
+ public:
+  explicit PacketLogger(const std::string& log_file_path);
+  ~PacketLogger();
+
+  void LogPacket(const NetworkTesterPacket& packet);
+
+ private:
+  std::ofstream packet_logger_stream_;
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(PacketLogger);
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_TOOLS_NETWORK_TESTER_PACKET_LOGGER_H_