Implement the "needs-ice-restart" logic for SetConfiguration.

webrtc/p2p/base/jseptransport.h

 /*
  *  Copyright 2004 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 270 matching lines @@
   bool SetLocalTransportDescription(const TransportDescription& description,
                                     ContentAction action,
                                     std::string* error_desc);
 
   // Set the remote TransportDescription to be used by DTLS and ICE channels
   // that are part of this Transport.
   bool SetRemoteTransportDescription(const TransportDescription& description,
                                      ContentAction action,
                                      std::string* error_desc);
 
+  // Set the "needs-ice-restart" flag as described in JSEP. After the flag is
+  // set, offers should generate new ufrags/passwords until an ICE restart
+  // occurs.
+  //
+  // This and the below method can be called safely from any thread as long as
+  // SetXTransportDescription is not in progress.
+  void SetNeedsIceRestartFlag();
+  // Returns true if the ICE restart flag above was set, and no ICE restart has
+  // occurred yet for this transport (by applying a local description with
+  // changed ufrag/password).
+  bool NeedsIceRestart() const;
+
   void GetSslRole(rtc::SSLRole* ssl_role) const;
 
   // TODO(deadbeef): Make this const. See comment in transportcontroller.h.
   bool GetStats(TransportStats* stats);
 
   // The current local transport description, possibly used
   // by the transport controller.
   const TransportDescription* local_description() const {
     return local_description_.get();
   }
@@ skipping 40 matching lines @@
   // Pushes down the transport parameters from the remote description to the
   // transport channel.
   bool ApplyRemoteTransportDescription(TransportChannelImpl* channel,
                                        std::string* error_desc);
 
   // Pushes down the transport parameters obtained via negotiation.
   bool ApplyNegotiatedTransportDescription(TransportChannelImpl* channel,
                                            std::string* error_desc);
 
   const std::string mid_;
+  // needs-ice-restart bit as described in JSEP.
+  bool needs_ice_restart_ = false;
   rtc::scoped_refptr<rtc::RTCCertificate> certificate_;
   rtc::SSLRole secure_role_ = rtc::SSL_CLIENT;
   std::unique_ptr<rtc::SSLFingerprint> remote_fingerprint_;
   std::unique_ptr<TransportDescription> local_description_;
   std::unique_ptr<TransportDescription> remote_description_;
   bool local_description_set_ = false;
   bool remote_description_set_ = false;
 
   // Candidate component => DTLS channel
   std::map<int, TransportChannelImpl*> channels_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(JsepTransport);
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_JSEPTRANSPORT_H_