Track pending ICE restarts independently for different media sections.

webrtc/api/peerconnection.h

Index: webrtc/api/peerconnection.h
diff --git a/webrtc/api/peerconnection.h b/webrtc/api/peerconnection.h
index 7ad1940f77a89b68a5bdd57a27a405b13188281a..a63dd4342358fc96b21a38fe3f67237ed7d98545 100644
--- a/webrtc/api/peerconnection.h
+++ b/webrtc/api/peerconnection.h
@@ -30,12 +30,15 @@ class RemoteMediaStreamFactory;
 
 // Populates |session_options| from |rtc_options|, and returns true if options
 // are valid.
+// |session_options|->transport_options map entries must exist in order for
+// them to be populated from |rtc_options|.
 bool ConvertRtcOptionsForOffer(
     const PeerConnectionInterface::RTCOfferAnswerOptions& rtc_options,
     cricket::MediaSessionOptions* session_options);
 
 // Populates |session_options| from |constraints|, and returns true if all
 // mandatory constraints are satisfied.
+// Assumes that |session_options|->transport_options map entries exist.
 bool ParseConstraintsForAnswer(const MediaConstraintsInterface* constraints,
                                cricket::MediaSessionOptions* session_options);