Add JSON serializer to MediaDeviceInfo.

third_party/WebKit/Source/modules/mediastream/MediaDeviceInfo.cpp

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
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 #include "modules/mediastream/MediaDeviceInfo.h"
 
+#include "bindings/core/v8/ScriptState.h"
+#include "bindings/core/v8/ScriptValue.h"
+#include "bindings/core/v8/V8ObjectBuilder.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 MediaDeviceInfo* MediaDeviceInfo::create(const WebMediaDeviceInfo& webMediaDeviceInfo)
 {
     ASSERT(!webMediaDeviceInfo.isNull());
     return new MediaDeviceInfo(webMediaDeviceInfo);
 }
 
@@ skipping 25 matching lines @@
 String MediaDeviceInfo::label() const
 {
     return m_webMediaDeviceInfo.label();
 }
 
 String MediaDeviceInfo::groupId() const
 {
     return m_webMediaDeviceInfo.groupId();
 }
 
+ScriptValue MediaDeviceInfo::toJSONForBinding(ScriptState* scriptState)
+{
+    V8ObjectBuilder result(scriptState);
+    result.addString("deviceId", deviceId());
+    result.addString("kind", kind());
+    result.addString("label", label());
+    result.addString("groupId", groupId());
+    return result.scriptValue();
+}
+
 } // namespace blink