Add V8ObjectBuilder helper and use in modules/crypto/

Source/bindings/core/v8/V8ObjectBuilder.h

Index: Source/bindings/core/v8/V8ObjectBuilder.h
diff --git a/Source/bindings/core/v8/V8ObjectBuilder.h b/Source/bindings/core/v8/V8ObjectBuilder.h
new file mode 100644
index 0000000000000000000000000000000000000000..86bb269a8be475683c7ffe6996ac5332726e2fc7
--- /dev/null
+++ b/Source/bindings/core/v8/V8ObjectBuilder.h
@@ -0,0 +1,42 @@
+// 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 ScriptState;
+class ScriptValue;
+
+class V8ObjectBuilder {

[bashi, 2015/03/25 01:09:25]

nit: Add final

[Jens Widell, 2015/03/25 11:16:04]

Done.

+public:
+    explicit V8ObjectBuilder(ScriptState*);
+
+    ScriptState* scriptState() const { return m_scriptState.get(); }
+
+    V8ObjectBuilder& add(String name, const ScriptValue&);
+    V8ObjectBuilder& add(String name, const V8ObjectBuilder&);
+
+    V8ObjectBuilder& addNull(String name);
+    V8ObjectBuilder& addBoolean(String name, bool value);
+    V8ObjectBuilder& addNumber(String name, double value);
+    V8ObjectBuilder& addString(String name, String value);
+
+    ScriptValue scriptValue() const;
+    v8::Local<v8::Object> v8Value() const { return m_object; }
+
+private:
+    void add(String name, v8::Local<v8::Value>);
+
+    RefPtr<ScriptState> m_scriptState;
+    v8::Local<v8::Object> m_object;
+};
+
+} // namespace blink
+
+#endif // V8ObjectBuilder_h