Add a switch to redetermine role when ICE restarts.

webrtc/api/peerconnection.cc

 /*
  *  Copyright 2012 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.
  */
 
@@ skipping 609 matching lines @@
   }
 
   media_controller_.reset(
       factory_->CreateMediaController(configuration.media_config));
 
   session_.reset(new WebRtcSession(
       media_controller_.get(), factory_->network_thread(),
       factory_->worker_thread(), factory_->signaling_thread(),
       port_allocator_.get(),
       std::unique_ptr<cricket::TransportController>(
-          factory_->CreateTransportController(port_allocator_.get()))));
+          factory_->CreateTransportController(
+              port_allocator_.get(),
+              configuration.redetermine_role_on_ice_restart))));
 
   stats_.reset(new StatsCollector(this));
 
   // Initialize the WebRtcSession. It creates transport channels etc.
   if (!session_->Initialize(factory_->options(), std::move(cert_generator),
                             configuration)) {
     return false;
   }
 
   // Register PeerConnection as receiver of local ice candidates.
@@ skipping 1682 matching lines @@
 
 bool PeerConnection::StartRtcEventLog_w(rtc::PlatformFile file,
                                         int64_t max_size_bytes) {
   return media_controller_->call_w()->StartEventLog(file, max_size_bytes);
 }
 
 void PeerConnection::StopRtcEventLog_w() {
   media_controller_->call_w()->StopEventLog();
 }
 }  // namespace webrtc