Add serializers to RTCIceCandidate and RTCSessionDescription

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..ea90f289ebf46678b66915665196c5a2710c4a0d 100644
--- a/Source/modules/mediastream/RTCIceCandidate.cpp
+++ b/Source/modules/mediastream/RTCIceCandidate.cpp
@@ -33,6 +33,8 @@
 
 #include "bindings/core/v8/ExceptionMessages.h"
 #include "bindings/core/v8/ExceptionState.h"
+#include "bindings/core/v8/ScriptValue.h"
+#include "bindings/core/v8/V8ObjectBuilder.h"
 #include "core/dom/ExceptionCode.h"
 #include "modules/mediastream/RTCIceCandidateInit.h"
 
@@ -101,4 +103,13 @@ void RTCIceCandidate::setSdpMLineIndex(unsigned short sdpMLineIndex)
     m_webCandidate.setSdpMLineIndex(sdpMLineIndex);
 }
 
+ScriptValue RTCIceCandidate::toJSONForBinding(ScriptState* scriptState)
+{
+    V8ObjectBuilder result(scriptState);
+    result.addString("candidate", m_webCandidate.candidate());
+    result.addString("sdpMid", m_webCandidate.sdpMid());
+    result.addNumber("sdpMLineIndex", m_webCandidate.sdpMLineIndex());
+    return result.scriptValue();
+}
+
 } // namespace blink