IDL: DOM impl class code generation for IDL dictionaries

Source/bindings/templates/dictionary_impl.cpp

Index: Source/bindings/templates/dictionary_impl.cpp
diff --git a/Source/bindings/templates/dictionary_impl.cpp b/Source/bindings/templates/dictionary_impl.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..4c8de8014c6cf1c47ed293996dd15ec8567332e3
--- /dev/null
+++ b/Source/bindings/templates/dictionary_impl.cpp
@@ -0,0 +1,36 @@
+// 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"
+#include "{{cpp_class}}.h"
+
+{% for filename in cpp_includes %}
+#include "{{filename}}"
+{% endfor %}
+
+namespace blink {
+
+{# Constructor #}
+{{cpp_class}}::{{cpp_class}}()
+{
+}
+
+{# Setters #}
+{% for member in members %}
+void {{cpp_class}}::{{member.setter_name}}({{member.argument_cpp_type}} value)
+{
+    m_{{member.name}} = value;
+}
+
+{% endfor %}
+void {{cpp_class}}::trace(Visitor* visitor)
+{
+    {% for member in members if member.is_traceable %}
+    visitor->trace(m_{{member.name}});

[bashi, 2014/07/25 10:05:40]

If I understand correctly, Visitor::trace(Nullable<T>) will work as expected
(via TraceIfNeeded<T>::trace(visitor, &m_value)).

+    {% endfor %}
+}
+
+} // namespace blink