Add signaling to support ICE renomination.

webrtc/api/peerconnectioninterface.h

Index: webrtc/api/peerconnectioninterface.h
diff --git a/webrtc/api/peerconnectioninterface.h b/webrtc/api/peerconnectioninterface.h
index fdf9cef51ec2a2a8b419227522d085a36b2c4ad2..0cfba8bc865e5d282039fc1a70baef9a6f94f242 100644
--- a/webrtc/api/peerconnectioninterface.h
+++ b/webrtc/api/peerconnectioninterface.h
@@ -314,18 +314,14 @@ class PeerConnectionInterface : public rtc::RefCountInterface {
     // The default value for constraint offerToReceiveX:true.
     static const int kOfferToReceiveMediaTrue = 1;
 
-    int offer_to_receive_video;
-    int offer_to_receive_audio;
-    bool voice_activity_detection;
-    bool ice_restart;
-    bool use_rtp_mux;
-
-    RTCOfferAnswerOptions()
-        : offer_to_receive_video(kUndefined),
-          offer_to_receive_audio(kUndefined),
-          voice_activity_detection(true),
-          ice_restart(false),
-          use_rtp_mux(true) {}
+    int offer_to_receive_video = kUndefined;
+    int offer_to_receive_audio = kUndefined;
+    bool voice_activity_detection = true;
+    bool ice_restart = false;
+    bool ice_renomination = false;
+    bool use_rtp_mux = true;
+
+    RTCOfferAnswerOptions() = default;
 
     RTCOfferAnswerOptions(int offer_to_receive_video,
                           int offer_to_receive_audio,