Create the API that returns the RTCConfiguration of the PeerConnection.

third_party/WebKit/Source/modules/peerconnection/RTCPeerConnection.idl

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * 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
@@ skipping 65 matching lines @@
     // readonly attribute RTCSessionDescription? pendingLocalDescription;
     [CallWith=ScriptState] Promise<void> setRemoteDescription(RTCSessionDescriptionInit description);
     readonly attribute RTCSessionDescription? remoteDescription;
     // readonly attribute RTCSessionDescription? currentRemoteDescription;
     // readonly attribute RTCSessionDescription? pendingRemoteDescription;
     [CallWith=ScriptState, MeasureAs=RTCPeerConnectionAddIceCandidatePromise] Promise<void> addIceCandidate ((RTCIceCandidateInit or RTCIceCandidate) candidate);
     readonly attribute RTCSignalingState signalingState;
     readonly attribute RTCIceGatheringState iceGatheringState;
     readonly attribute RTCIceConnectionState iceConnectionState;
     // readonly attribute boolean? canTrickleIceCandidates;
-    // RTCConfiguration getConfiguration();
+    RTCConfiguration getConfiguration();
     [CallWith=ScriptState, RaisesException] void setConfiguration(RTCConfiguration configuration);
     // TODO(guidou): close() should never throw an exception.
     [RaisesException] void close();
     attribute EventHandler onnegotiationneeded;
     attribute EventHandler onicecandidate;
     attribute EventHandler onsignalingstatechange;
     attribute EventHandler oniceconnectionstatechange;
     attribute EventHandler onicegatheringstatechange;
 
     // https://w3c.github.io/webrtc-pc/#legacy-interface-extensions
@@ skipping 28 matching lines @@
     // Non-standard or removed from the spec:
     [Measure] sequence<MediaStream> getLocalStreams();
     [Measure] sequence<MediaStream> getRemoteStreams();
     [Measure] MediaStream getStreamById(DOMString streamId);
     [Measure, CallWith=ScriptState, RaisesException] void addStream(MediaStream? stream, optional Dictionary mediaConstraints);
     [Measure, RaisesException] void removeStream(MediaStream? stream);
     [Measure, RaisesException] RTCDTMFSender createDTMFSender(MediaStreamTrack track);
     attribute EventHandler onaddstream;
     attribute EventHandler onremovestream;
 };