Add a switch to redetermine role when ICE restarts.

webrtc/api/peerconnectioninterface.h

Index: webrtc/api/peerconnectioninterface.h
diff --git a/webrtc/api/peerconnectioninterface.h b/webrtc/api/peerconnectioninterface.h
index fdf9cef51ec2a2a8b419227522d085a36b2c4ad2..f26d493c43da1470d493ea550bc2483d0a16879e 100644
--- a/webrtc/api/peerconnectioninterface.h
+++ b/webrtc/api/peerconnectioninterface.h
@@ -305,6 +305,10 @@ class PeerConnectionInterface : public rtc::RefCountInterface {
     // If set to true, this means the ICE transport should presume TURN-to-TURN
     // candidate pairs will succeed, even before a binding response is received.
     bool presume_writable_when_fully_relayed = false;
+    // If true, ICE role is redetermined when peerconnection sets a local
+    // transport description that indicates an ICE restart.
+    // Default to true because that is the current behavior.
+    bool redetermine_role_on_ice_restart = true;

[pthatcher1, 2016/08/29 23:27:42]

Can we make the default = false?

[honghaiz3, 2016/08/29 23:32:27]

Done.

   };
 
   struct RTCOfferAnswerOptions {