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

Source/bindings/core/v8/V8ObjectBuilder.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8ObjectBuilder_h
+#define V8ObjectBuilder_h
+
+#include "wtf/text/WTFString.h"
+#include <v8.h>
+
+namespace blink {
+
+class ScriptValue;
+
+class V8ObjectBuilder {
+public:
+    V8ObjectBuilder(v8::Isolate*);
+
+    ScriptValue scriptValue() const;
+    v8::Local<v8::Object> v8Value() const { return m_object; }
+
+    void add(String name, const ScriptValue&);

[bashi, 2015/03/24 00:49:05]

nit: How about making add methods return *this? This way, call site can use
following pattern.

  builder.addNull("x")
    .addBoolean("y", true)
    .addNumber("z", 42);

I'm sure you know this pattern, and I'm not sure we want to do in Blink, so this
is just a nit.

[Jens Widell, 2015/03/24 07:10:03]

Yeah, might as well do this, if we drop the current addObject(). (Combining this
with the current addObject() would be quite confusing.)

+    void addNull(String name);
+    void addBoolean(String name, bool value);
+    void addNumber(String name, double value);
+    void addString(String name, String value);
+
+    V8ObjectBuilder addObject(String name);
+
+private:
+    void add(String name, v8::Local<v8::Value>);
+
+    v8::Isolate* m_isolate;
+    v8::Local<v8::Object> m_object;
+};
+
+} // namespace blink
+
+#endif // V8ObjectBuilder_h