[WIP] IDL: Add limited serializer support and use for RTCIceCandidate

Source/modules/mediastream/RTCIceCandidate.cpp

Index: Source/modules/mediastream/RTCIceCandidate.cpp
diff --git a/Source/modules/mediastream/RTCIceCandidate.cpp b/Source/modules/mediastream/RTCIceCandidate.cpp
index ad987607afb496c3c1dba0ce342e362673814c43..07853664ecf94e6652090963779b35079e0a0afb 100644
--- a/Source/modules/mediastream/RTCIceCandidate.cpp
+++ b/Source/modules/mediastream/RTCIceCandidate.cpp
@@ -33,6 +33,7 @@
 
 #include "bindings/core/v8/ExceptionMessages.h"
 #include "bindings/core/v8/ExceptionState.h"
+#include "bindings/core/v8/V8ObjectBuilder.h"
 #include "core/dom/ExceptionCode.h"
 #include "modules/mediastream/RTCIceCandidateInit.h"
 
@@ -101,4 +102,11 @@ void RTCIceCandidate::setSdpMLineIndex(unsigned short sdpMLineIndex)
     m_webCandidate.setSdpMLineIndex(sdpMLineIndex);
 }
 
+void RTCIceCandidate::toJSONForBinding(V8ObjectBuilder& result)
+{
+    result.addString("candidate", m_webCandidate.candidate());
+    result.addString("sdpMid", m_webCandidate.sdpMid());
+    result.addNumber("sdpMLineIndex", m_webCandidate.sdpMLineIndex());
+}
+
 } // namespace blink