Update API for Objective-C RTCPeerConnection.

webrtc/api/objc/RTCPeerConnectionObserver.h

+/*
+ *  Copyright 2015 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.
+ */
+
+#include "talk/app/webrtc/peerconnectioninterface.h"
+
+#import "RTCPeerConnection.h"
+#import "RTCPeerConnectionDelegate.h"
+
+// These objects are created by RTCPeerConnectionFactory to wrap an
+// id<RTCPeerConnectionDelegate> and call methods on that interface.
+
+namespace webrtc {
+
+class PeerConnectionDelegateAdapter : public PeerConnectionObserver {
+
+ public:
+  PeerConnectionDelegateAdapter(RTCPeerConnection* peerConnection);
+  virtual ~PeerConnectionDelegateAdapter();
+
+  /** Triggered when the SignalingState changed. */
+  void OnSignalingChange(
+      PeerConnectionInterface::SignalingState new_state) override;
+
+  /** Triggered when media is received on a new stream from remote peer. */
+  void OnAddStream(MediaStreamInterface *stream) override;
+
+  /** Triggered when a remote peer closes a stream. */
+  void OnRemoveStream(MediaStreamInterface *stream) override;
+
+  /** Triggered when a remote peer opens a data channel. */
+  void OnDataChannel(DataChannelInterface *data_channel) override;
+
+  /** Triggered when renegotiation is needed, for example ICE has restarted. */
+  void OnRenegotiationNeeded() override;
+
+  // Called any time the IceConnectionState changes
+  void OnIceConnectionChange(
+      PeerConnectionInterface::IceConnectionState new_state) override;
+
+  // Called any time the IceGatheringState changes
+  void OnIceGatheringChange(
+      PeerConnectionInterface::IceGatheringState new_state) override;
+
+  // New ice candidate has been found.
+  void OnIceCandidate(const IceCandidateInterface *candidate) override;
+
+ private:
+  __weak RTCPeerConnection *peerConnection_;
+};
+
+} // namespace webrtc