Add serializers to RTCIceCandidate and RTCSessionDescription

Source/modules/mediastream/RTCSessionDescription.h

 /*
  * 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 20 matching lines @@
 #ifndef RTCSessionDescription_h
 #define RTCSessionDescription_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "public/platform/WebRTCSessionDescription.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
 class RTCSessionDescriptionInit;
+class ScriptState;
+class ScriptValue;
 
 class RTCSessionDescription final : public GarbageCollectedFinalized<RTCSessionDescription>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static RTCSessionDescription* create(const RTCSessionDescriptionInit&);
     static RTCSessionDescription* create(WebRTCSessionDescription);
 
     String type();
     void setType(const String&);
 
     String sdp();
     void setSdp(const String&);
 
+    ScriptValue toJSONForBinding(ScriptState*);
+
     WebRTCSessionDescription webSessionDescription();
 
     DEFINE_INLINE_TRACE() { }
 
 private:
     explicit RTCSessionDescription(WebRTCSessionDescription);
 
     WebRTCSessionDescription m_webSessionDescription;
 };
 
 } // namespace blink
 
 #endif // RTCSessionDescription_h