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 CreateTesterConfig(packet_send_interval_ms, packet_size, execution_time_ms):
+  config = network_tester_config_pb2.NetworkTesterConfig()
+  config.packet_send_interval_ms = packet_send_interval_ms
+  config.packet_size = packet_size
+  config.execution_time_ms = execution_time_ms
+  return config
+
+network_configs = []
+
+network_configs.append(CreateTesterConfig(10, 50, 200))
+network_configs.append(CreateTesterConfig(10, 100, 200))
+
+with open("network_tester_config.dat",'wb') as f:
+  for config in network_configs:
+    f.write(chr(config.ByteSize()))
+    f.write(config.SerializeToString())