Reland "Add first part of the network_tester functionality"

webrtc/tools/network_tester/create_network_tester_config.py

+#!/usr/bin/env python
+# Copyright (c) 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.
+
+import network_tester_config_pb2
+
+
+def AddConfig(all_configs,
+              packet_send_interval_ms,
+              packet_size,
+              execution_time_ms):
+  config = all_configs.configs.add()
+  config.packet_send_interval_ms = packet_send_interval_ms
+  config.packet_size = packet_size
+  config.execution_time_ms = execution_time_ms
+
+def main():
+  all_configs = network_tester_config_pb2.NetworkTesterAllConfigs()
+  AddConfig(all_configs, 10, 50, 200)
+  AddConfig(all_configs, 10, 100, 200)
+  with open("network_tester_config.dat", 'wb') as f:
+    f.write(all_configs.SerializeToString())
+
+if __name__ == "__main__":
+  main()