Reland of Adding PeerConnectionInterface::SetConfiguration method.

talk/app/webrtc/peerconnectioninterface.h

 /*
  * libjingle
  * Copyright 2012 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 361 matching lines @@
   // The |observer| callback will be called when done.
   virtual void SetLocalDescription(SetSessionDescriptionObserver* observer,
                                    SessionDescriptionInterface* desc) = 0;
   // Sets the remote session description.
   // JsepInterface takes the ownership of |desc| even if it fails.
   // The |observer| callback will be called when done.
   virtual void SetRemoteDescription(SetSessionDescriptionObserver* observer,
                                     SessionDescriptionInterface* desc) = 0;
   // Restarts or updates the ICE Agent process of gathering local candidates
   // and pinging remote candidates.
+  // TODO(deadbeef): Remove once Chrome is moved over to SetConfiguration.
   virtual bool UpdateIce(const IceServers& configuration,
-                         const MediaConstraintsInterface* constraints) = 0;
+                         const MediaConstraintsInterface* constraints) {
+    return false;
+  }
+  // Sets the PeerConnection's global configuration to |config|.
+  // 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.
+  // TODO(deadbeef): Make this pure virtual once all Chrome subclasses of
+  // PeerConnectionInterface implement it.
+  virtual bool SetConfiguration(
+      const PeerConnectionInterface::RTCConfiguration& config) {
+    return false;
+  }
   // Provides a remote candidate to the ICE Agent.
   // A copy of the |candidate| will be created and added to the remote
   // description. So the caller of this method still has the ownership of the
   // |candidate|.
   // TODO(ronghuawu): Consider to change this so that the AddIceCandidate will
   // take the ownership of the |candidate|.
   virtual bool AddIceCandidate(const IceCandidateInterface* candidate) = 0;
 
   virtual void RegisterUMAObserver(UMAObserver* observer) = 0;
 
@@ skipping 224 matching lines @@
 CreatePeerConnectionFactory(
     rtc::Thread* worker_thread,
     rtc::Thread* signaling_thread,
     AudioDeviceModule* default_adm,
     cricket::WebRtcVideoEncoderFactory* encoder_factory,
     cricket::WebRtcVideoDecoderFactory* decoder_factory);
 
 }  // namespace webrtc
 
 #endif  // TALK_APP_WEBRTC_PEERCONNECTIONINTERFACE_H_