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

webrtc/api/webrtcsessiondescriptionfactory.cc

 /*
  *  Copyright 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.
  */
 
@@ skipping 320 matching lines @@
       break;
     }
     default:
       ASSERT(false);
       break;
   }
 }
 
 void WebRtcSessionDescriptionFactory::InternalCreateOffer(
     CreateSessionDescriptionRequest request) {
+  if (session_->local_description()) {
+    for (const cricket::TransportInfo& transport :
+         session_->local_description()->description()->transport_infos()) {
+      // If the needs-ice-restart flag is set as described by JSEP, we should
+      // generate an offer with a new ufrag/password to trigger an ICE restart.
+      if (session_->NeedsIceRestart(transport.content_name)) {
+        request.options.transport_options[transport.content_name].ice_restart =
+            true;
+      }
+    }
+  }
+
   cricket::SessionDescription* desc(session_desc_factory_.CreateOffer(
       request.options, session_->local_description()
                            ? session_->local_description()->description()
                            : nullptr));
   // RFC 3264
   // When issuing an offer that modifies the session,
   // the "o=" line of the new SDP MUST be identical to that in the
   // previous SDP, except that the version in the origin field MUST
   // increment by one from the previous SDP.
 
@@ skipping 137 matching lines @@
     if (create_session_description_requests_.front().type ==
         CreateSessionDescriptionRequest::kOffer) {
       InternalCreateOffer(create_session_description_requests_.front());
     } else {
       InternalCreateAnswer(create_session_description_requests_.front());
     }
     create_session_description_requests_.pop();
   }
 }
 }  // namespace webrtc