Add first part of the network_tester functionality.

webrtc/tools/network_tester/config_reader.h

Index: webrtc/tools/network_tester/config_reader.h
diff --git a/webrtc/tools/network_tester/config_reader.h b/webrtc/tools/network_tester/config_reader.h
new file mode 100644
index 0000000000000000000000000000000000000000..62e03da5b89d658f55513478c79573f8c7b250a0
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+++ b/webrtc/tools/network_tester/config_reader.h
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+/*
+ *  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_CONFIG_READER_H_
+#define WEBRTC_TOOLS_NETWORK_TESTER_CONFIG_READER_H_
+
+#include <fstream>
+#include <string>
+
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/base/optional.h"
+
+#include "webrtc/base/ignore_wundef.h"
+
+#ifdef WEBRTC_NETWORK_TESTER_PROTO
+RTC_PUSH_IGNORING_WUNDEF()
+#include "webrtc/tools/network_tester/network_tester_config.pb.h"
+RTC_POP_IGNORING_WUNDEF()
+using webrtc::network_tester::config::NetworkTesterAllConfigs;
+#else
+class NetworkTesterConfigs;
+#endif  // WEBRTC_NETWORK_TESTER_PROTO
+
+namespace webrtc {
+
+class ConfigReader {
+ public:
+  struct Config {
+    int packet_send_interval_ms;
+    int packet_size;
+    int execution_time_ms;
+  };
+  explicit ConfigReader(const std::string& config_file_path);
+  ~ConfigReader();
+
+  rtc::Optional<Config> GetNextConfig();
+
+ private:
+  NetworkTesterAllConfigs proto_all_configs_;
+  int proto_config_index_;
+  RTC_DISALLOW_COPY_AND_ASSIGN(ConfigReader);
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_TOOLS_NETWORK_TESTER_CONFIG_READER_H_