Implement current/pending session description methods.

webrtc/api/peerconnection.h

 /*
  *  Copyright 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 95 matching lines @@
                 StatsOutputLevel level) override;
   void GetStats(RTCStatsCollectorCallback* callback) override;
 
   SignalingState signaling_state() override;
 
   IceConnectionState ice_connection_state() override;
   IceGatheringState ice_gathering_state() override;
 
   const SessionDescriptionInterface* local_description() const override;
   const SessionDescriptionInterface* remote_description() const override;
+  const SessionDescriptionInterface* current_local_description() const override;
+  const SessionDescriptionInterface* current_remote_description()
+      const override;
+  const SessionDescriptionInterface* pending_local_description() const override;
+  const SessionDescriptionInterface* pending_remote_description()
+      const override;
 
   // JSEP01
   // Deprecated, use version without constraints.
   void CreateOffer(CreateSessionDescriptionObserver* observer,
                    const MediaConstraintsInterface* constraints) override;
   void CreateOffer(CreateSessionDescriptionObserver* observer,
                    const RTCOfferAnswerOptions& options) override;
   // Deprecated, use version without constraints.
   void CreateAnswer(CreateSessionDescriptionObserver* observer,
                     const MediaConstraintsInterface* constraints) override;
@@ skipping 302 matching lines @@
       rtc::scoped_refptr<RtpReceiverProxyWithInternal<RtpReceiverInternal>>>
       receivers_;
   std::unique_ptr<WebRtcSession> session_;
   std::unique_ptr<StatsCollector> stats_;
   rtc::scoped_refptr<RTCStatsCollector> stats_collector_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_PEERCONNECTION_H_