Update prflx candidates' generation when setting ICE credentials.

webrtc/p2p/base/port.h

Index: webrtc/p2p/base/port.h
diff --git a/webrtc/p2p/base/port.h b/webrtc/p2p/base/port.h
index 7c4468d2e6b7d112abf7a4b93f41b9645e5f86c3..2961355e3e1cf839689eeb72ad143c7f3c7960cb 100644
--- a/webrtc/p2p/base/port.h
+++ b/webrtc/p2p/base/port.h
@@ -574,10 +574,14 @@ class Connection : public CandidatePairInterface,
 
   uint32_t ComputeNetworkCost() const;
 
-  // Update the ICE password of the remote candidate if |ice_ufrag| matches
-  // the candidate's ufrag, and the candidate's passwrod has not been set.
-  void MaybeSetRemoteIceCredentials(const std::string& ice_ufrag,
-                                    const std::string& ice_pwd);
+  // Update the ICE password and/or generation of the remote candidate if a
+  // ufrag in |remote_ice_parameters| matches the candidate's ufrag, and the
+  // candidate's password and/or ufrag has not been set.
+  // |remote_ice_parameters| should be a list of known ICE parameters ordered
+  // by generation.
+  void MaybeSetRemoteIceCredentialsAndGeneration(const std::string& ice_ufrag,
+                                                 const std::string& ice_pwd,
+                                                 int generation);
 
   // If |remote_candidate_| is peer reflexive and is equivalent to
   // |new_candidate| except the type, update |remote_candidate_| to