Move RTP keep-alive config from VideoSendStream::Config to Call::Config

webrtc/call/call.h

 /*
  *  Copyright (c) 2013 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_CALL_CALL_H_
@@ skipping 94 matching lines @@
     // TODO(solenberg): Change this to a shared_ptr once we can use C++11.
     rtc::scoped_refptr<AudioState> audio_state;
 
     // Audio Processing Module to be used in this call.
     // TODO(solenberg): Change this to a shared_ptr once we can use C++11.
     AudioProcessing* audio_processing = nullptr;
 
     // RtcEventLog to use for this call. Required.
     // Use webrtc::RtcEventLog::CreateNull() for a null implementation.
     RtcEventLog* event_log = nullptr;
+
+    // Enables periodic sending if empty keep-alive messages that helps prevent
+    // network time-out events.

[pbos-webrtc, 2017/07/10 22:40:23]

Is there a RFC you can point to here?

[sprang_webrtc, 2017/07/11 08:39:58]

Done.

+    RtpKeepAliveConfig keepalive_config;
   };
 
   struct Stats {
     std::string ToString(int64_t time_ms) const;
 
     int send_bandwidth_bps = 0;       // Estimated available send bandwidth.
     int max_padding_bitrate_bps = 0;  // Cumulative configured max padding.
     int recv_bandwidth_bps = 0;       // Estimated available receive bandwidth.
     int64_t pacer_delay_ms = 0;
     int64_t rtt_ms = -1;
@@ skipping 73 matching lines @@
       const rtc::NetworkRoute& network_route) = 0;
 
   virtual void OnSentPacket(const rtc::SentPacket& sent_packet) = 0;
 
   virtual ~Call() {}
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_CALL_CALL_H_