[WIP][NotForLand] IDL dictionary support

Source/bindings/templates/dictionary_impl.cpp

+// Copyright 2014 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.
+
+// This file has been auto-generated by {{code_generator}}. DO NOT MODIFY!
+
+#include "config.h"
+{% filter conditional(conditional_string) %}
+#include "{{cpp_name}}.h"
+
+{% for filename in cpp_includes %}
+#include "{{filename}}"
+{% endfor %}
+
+namespace WebCore {
+
+{# Constructor #}
+{{cpp_name}}::{{cpp_name}}()
+{
+    {% for member in members %}
+    m_{{member.has_name}} = false;
+    {% endfor %}
+}
+
+{# Setters #}
+{% for member in members %}
+void {{cpp_name}}::{{member.setter_name}}({{member.argument_cpp_type}} value)
+{
+    m_{{member.name}} = value;
+    m_{{member.has_name}} = true;
+}
+
+{% endfor %}
+
+void {{cpp_name}}::trace(Visitor* visitor)
+{
+    {% for member in members if member.is_traceable %}
+    visitor->trace(m_{{member.name}});
+    {% endfor %}
+}
+
+} // namespace WebCore
+{% endfilter %}