Adding PeerConnectionInterface::SetConfiguration method.

talk/app/webrtc/objc/public/RTCPeerConnection.h

 /*
  * libjingle
  * Copyright 2013 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
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  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
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  *     derived from this software without specific prior written permission.
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  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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 #import "RTCPeerConnectionDelegate.h"
 
+@class RTCConfiguration;
 @class RTCDataChannel;
 @class RTCDataChannelInit;
 @class RTCICECandidate;
 @class RTCICEServers;
 @class RTCMediaConstraints;
 @class RTCMediaStream;
 @class RTCMediaStreamTrack;
 @class RTCSessionDescription;
 @protocol RTCSessionDescriptionDelegate;
 @protocol RTCStatsDelegate;
@@ skipping 50 matching lines @@
 - (void)
     setLocalDescriptionWithDelegate:(id<RTCSessionDescriptionDelegate>)delegate
                  sessionDescription:(RTCSessionDescription *)sdp;
 
 // Sets the remote session description.
 // Success or failure will be reported via RTCSessionDescriptionDelegate.
 - (void)
     setRemoteDescriptionWithDelegate:(id<RTCSessionDescriptionDelegate>)delegate
                   sessionDescription:(RTCSessionDescription *)sdp;
 
-// Restarts or updates the ICE Agent process of gathering local candidates
-// and pinging remote candidates.
-- (BOOL)updateICEServers:(NSArray *)servers
-             constraints:(RTCMediaConstraints *)constraints;
+// Sets the PeerConnection's global configuration to |configuration|.
+// Any changes to STUN/TURN servers or ICE candidate policy will affect the
+// next gathering phase, and cause the next call to createOffer to generate
+// new ICE credentials. Note that the BUNDLE and RTCP-multiplexing policies
+// cannot be changed with this method.
+- (BOOL)setConfiguration:(RTCConfiguration *)configuration;
 
 // Provides a remote candidate to the ICE Agent.
 - (BOOL)addICECandidate:(RTCICECandidate *)candidate;
 
 // Terminates all media and closes the transport.
 - (void)close;
 
 // Gets statistics for the media track. If |mediaStreamTrack| is nil statistics
 // are gathered for all tracks.
 // Statistics information will be reported via RTCStatsDelegate.
 - (BOOL)getStatsWithDelegate:(id<RTCStatsDelegate>)delegate
             mediaStreamTrack:(RTCMediaStreamTrack*)mediaStreamTrack
             statsOutputLevel:(RTCStatsOutputLevel)statsOutputLevel;
 
 #ifndef DOXYGEN_SHOULD_SKIP_THIS
 // Disallow init and don't add to documentation
 - (id)init __attribute__(
     (unavailable("init is not a supported initializer for this class.")));
 #endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
 @end